Warning Systems Gas & Smoke

Warning Systems Gas & Smoke

 

... more relaxed for sure

made in Germany

Not all gas is the same!

In recent years, gas has increasingly established itself as an interesting alternative to oil and electricity. However, it should not be forgotten that explosive and extremely flammable gases are usually used, which can be toxic or even fatal even at low concentrations. Gas technology therefore poses a major challenge to the safety of people and buildings. Most serious accidents such as gas explosions and gas poisoning are caused by town gas, natural gas, carbon monoxide (CO) and carbon dioxide. Smoke also has a narcotic effect, which is why many people only notice it at a late stage.

The use of gas varies depending on the household or area of application.

For this reason, the gas detector must be suitable for the type of gas in question and be able to detect if the normal values are exceeded.

Gas detector overview

Gas detector city or natural gas

GAS ALARM GX-A1+

Item no.: 300892
269,00 
The universal gas warning device for surface-mounted fixed installation is suitable for different gases depending on the sensor. It provides the operating voltage required for the sensor, regulates the heating current required for some sensors and evaluates the sensor voltage returned by the sensor and displays it on its illuminated plain text display. Based on the different voltages, the GX-A1+ recognizes five different states, including the pre-alarm from 2.0 volts and the main alarm from 2.5 volts, at which not only the potential-free changeover relay assigned to the alarm switches, but the entire warning device makes itself clearly audiovisually noticeable with a loud alarm tone and flashing display lighting. There are sensors for city and natural gas, refrigerant (HFC) and carbon dioxide in two measuring ranges; for carbon monoxide a separate set GX-A1+CO is available, as the TÜV-tested CO sensors are addressed and evaluated differently. Possible applications
  • Detection of town, natural and liquid gases
  • Methane, butane, propane, ethanol
  • Gastronomy, CO2 bottles, dispensing systems
  • Dry ice processing and storage
  • Detection of refrigerants such as R-32, R-404a, R-410a, etc.

GAS ALARM GX-B1pro

Item no.: 300924
109,00 
The socket gas warning device with internal sensor for town gas and natural gas is plugged into an upper (natural gas / methane) or lower (liquid gas / butane, propane) socket depending on the gas, is ready for operation after 3 minutes preheating time and warns already far below dangerous gas concentrations with a loud alarm tone and red flashing LED. Possible applications
  • Monitoring of gas heating or gas cooker / detection of town, natural and liquid gases
  • Monitoring of the heating and utility rooms
  • Storage of liquid gas cylinders or camping gas
  • Air conditioners / coolants

GAS ALARM GX-B2pro

Item no.: 300926
119,00 
The socket gas warning device with external sensor for town gas and natural gas is plugged into a socket and the sensor is set to an upper (natural gas / methane) or lower (liquid gas / butane, propane) position depending on the gas. The warning device is ready for operation after 3 minutes of preheating time and warns already far below dangerous gas concentrations with a loud alarm tone and red flashing LED. Possible applications
  • Monitoring of gas heating or gas cooker / detection of town, natural and liquid gases
  • Monitoring of the heating and utility rooms
  • Storage of liquid gas cylinders or camping gas
  • Air conditioners / coolants
 

GAS ALARM GX-B3

Item no.: 300222
159,00 
The socket gas warning device with external sensor for town gas and natural gas is plugged into a socket and the sensor is set to an upper (natural gas / methane) or lower (liquid gas / butane, propane) position depending on the gas. The warning device is ready for operation after 3 minutes and warns already far below dangerous gas concentrations with an alarm tone and red flashing LED. In the event of an alarm, the appliance connected to the GX-B3, e.g. a gas heater, is also reliably switched off, whereby the appliance remains switched off until the user has ensured that his ventilation measures have had an effect and he resets it by briefly unplugging it and plugging it back into the socket. Possible applications
  • Monitoring of gas heating, gas cooker and pipes
  • Detection of town, natural and liquid gases
  • Control of a solenoid shut-off valve

Gas Alarm GX-HS

Item no.: 400200
129,00 
Gas Alarm GX-HS is a gas detector for various gases, with a suitable sensor in each case. Alarm signal on the device optically and acoustically, additionally with potential-free relay (e.g. for solenoid shut-off valve).

PROF. GAS ALARM GX-C300S

Item no.: 300265
389,00 
The professional carbon monoxide warning device with internal CO sensor, whose measuring cell, evaluation electronics and software have been tested by TÜV Süd according to the standard, is here equipped with an additional external city and natural gas sensor, which makes the entire system the perfect warning device for the boiler room in which a gas heating system or boiler is installed. The alarm relay, which is energised in monitoring mode, drops out when gas is detected (methane, butane, propane, ethanol) or when the CO concentration specified by the standard is exceeded, and can thus switch off the heating system with its solenoid shut-off valve in the event of danger to reliably prevent further inflow of toxic or flammable gases.

Gas detector coolant and refrigerant

GX-K1 Gas alarm with internal sensor

Item no.: 300931
129,00 
The warning device warns of the toxic vapors that could escape from leaking refrigeration and cooling systems and primarily serves to protect people who should not inhale these vapors. The HFC ALARM GX-K1 with internal sensor or GX-K2 with external sensor already warns at concentrations far below a life-threatening level. This monitoring system is therefore set very sensitive according to its purpose. The GX-K1 or GX-K2 is plugged into the sockets, with the GX-K2 the sensor is positioned appropriately and then the HFC warning device is ready for operation after 3 minutes preheating time and warns early in case of leakage at the cooling system with a loud alarm tone and red flashing LED. The device is suitable for normal household use and must not be used in potentially explosive atmospheres.
The warning device is ready for operation after 3 minutes of preheating time and gives early warning of leaks in the cooling system with a loud alarm tone and red flashing LED.
Possible applications
  • Heat pumps
  • Air conditioners
  • Coolant and refrigerant
  • Hydrofluorocarbon

GX-K2 Gas alarm with external sensor

Item no.: 300932
139,00 
The warning device warns of the toxic vapors that could escape from leaking refrigeration and cooling systems and primarily serves to protect people who should not inhale these vapors. The HFC ALARM GX-K1 with internal sensor or GX-K2 with external sensor already warns at concentrations far below a life-threatening level. This monitoring system is therefore set very sensitive according to its purpose. The GX-K1 or GX-K2 is plugged into the sockets, with the GX-K2 the sensor is positioned appropriately and then the HFC warning device is ready for operation after 3 minutes preheating time and warns early in case of leakage at the cooling system with a loud alarm tone and red flashing LED. The device is suitable for normal household use and must not be used in potentially explosive atmospheres.
The warning device is ready for operation after 3 minutes of preheating time and gives early warning of leaks in the cooling system with a loud alarm tone and red flashing LED.
Possible applications
  • Heat pumps
  • Air conditioners
  • Coolant and refrigerant
  • Hydrofluorocarbon
   

Gas sensors LNG, city and natural gas, CFC refrigerant, hydrogen

Gas sensor GX-SE City / natural gas

Item no.: 200897-SE
95,00 
External city and natural gas sensor for the warning devices GX-A1+ or GX-HS, detects natural gas (methane) from leakages of the house installation or bottled gas (butane, propane) from leaking fittings.

Gas sensor GX-CFC for refrigerant

Item no.: 200901
119,00 
External refrigerant sensor for GX-A1+ or GX-HS warning devices, detects fluorinated hydrocarbons (HFC: R-22, R-32, R-410a, R-1234yf, ...) from leaking fittings of refrigeration, air conditioning and heat pump systems.

Gas sensor GX-LNG

Item no.: 300897
95,00 
External LNG, city and natural gas sensor for GX-A1+ or GX-HS warning devices, detects natural gas (methane) from leaks in the house installation or bottled gas (butane, propane) from leaking fittings.

Gas sensor GX-H2

Item no.: 200616
149,00 
External hydrogen sensor for GX-A1+ or GX-HS warning devices, detects hydrogen from leaking fittings of air conditioning and heat pump systems.

CO Gas Detectors & Warning Devices

GAS ALARM GX-CO-12

Item no.: 300712
129,00 
Areas of application
  • mobile use in camping vehicles and on ships
  • Camper, caravan
  • other recreational vehicles with gas cooking and cooling facilities
  • boiler room with gas heating or boiler
The CO detector, which has been fully tested by TÜV Süd according to DIN EN 50291, can be used both as a mobile device in your recreational vehicle (e.g. camper van) and as a stationary device at home. For mobile use, a cable for connection to the 12V or 24V battery is included, for operation at home, you will receive a plug-in power supply unit with matching RJ plug, so that alternating operation is also possible and the GX-CO-12 always ensures your safety: at home and on the road.   For installation in gas boilers from Viessmann we recommend the articles 7639852 or 7549937. Be sure to check the nameplate on the back to find the sensor that is right for you.

CO GAS ALARM GX-C1pro

Item no.: 300783
109,00 
The socket carbon monoxide warning device with internal electrochemical CO sensor is plugged into a medium-sized socket, is ready for operation after 5 minutes initialisation time and warns of excessive CO concentrations strictly according to the specifications of DIN EN 50291 for carbon monoxide in living spaces with a loud alarm tone and red flashing LED. The sensor, the evaluation, the measuring cell with its calibration as well as the software developed by Elektrotechnik Schabus were subjected to a full test at TÜV Süd according to DIN EN 50291, safety and stability were certified for the system. Possible applications
  • Monitoring for carbon monoxide leakage at combustion sites in flats, houses, shops, small businesses, cafés, low-dust workshops
  • Monitoring of all gas-fired installations
  • For gas heaters, gas heating, gas cookers, gas ovens, but also oil heaters and open fires, can also be used in bathrooms and other damp rooms, as long as moisture does not condense.
  • Designed for years of continuous operation
 

CO ALARM GX-C3pro

Item no.: 300229
179,00 
The socket CO warning device with external sensor for carbon monoxide is plugged into a socket and the sensor is placed at average nose level. The warning device is ready for operation after 5 minutes and warns with the alarm thresholds specified in DIN standard 50291 with an alarm tone and a red flashing LED. In the event of an alarm, the device connected to the GX-C3pro, e.g. a gas heater, is also reliably switched off, whereby the device remains switched off until the user has ensured that his ventilation measures have had an effect and he resets the device by briefly unplugging it and plugging it back into the socket. Possible applications
  • Monitoring in case of leakage of carbon monoxide from all heat generating equipment in apartments, houses, stores, ...
  • Monitoring of all gas-operated systems and safety shutdown in the event of elevated CO levels
  • for gas heaters, gas heating, gas cookers, gas furnaces, oil heating and any combustion facility with supply
  • Can also be used in the bathroom and other damp rooms as long as moisture does not condense
  • Designed for years of continuous operation

PROFI CO ALARM GX-C300

Item no.: 300255
299,00 
Professional carbon monoxide warning device for fixed installation with warning levels and alarm delay times as specified in the DIN EN 50291 standard. Display of the exact measured CO concentrations in ppm on an illuminated plain text display. In case of alarm and in case of technical faults detected by the device itself, one potential-free change-over relay each switches to activate e.g. forced ventilation or to inform the BMS. The internal electrochemical sensor has a service life of 6 to 10 years, depending on the ambient conditions, and can easily be replaced by Elektrotechnik Schabus at the factory.

PROF. CO ALARM GX-C300P

Item no.: 300256
399,00 
Professional carbon monoxide warning device for permanent installation with warning levels and alarm delay times as specified in the DIN EN 50291 standard and suction device by means of a silicone hose to monitor thermally demanding rooms (e.g. gas-operated sauna). Display of the exact measured CO concentrations in ppm on an illuminated plain text display. In the event of an alarm and technical faults detected by the unit itself, a potential-free changeover relay switches in each case, e.g. to activate forced ventilation or to inform the BMS. The internal electrochemical sensor has a service life of 6 to 10 years, depending on the ambient conditions, and can easily be replaced by Elektrotechnik Schabus at the factory.

GAS ALARM SET GX-A1+CO

Item no.: 300266
419,00 
We have designed the GX-A1+CO set in such a way that it is possible to equip a professional carbon monoxide warning device with an external sensor, e.g. to position the warning device in front of the room to be monitored and the sensor in the room to be monitored in order to see from the outside whether the room is safe to enter. The carbon monoxide concentration is evaluated and displayed with ppm accuracy. In the event of an alarm, a potential-free changeover relay switches and another relay switches in the event of technical faults detected by the warning device itself, such as a cable break or sensor failure, in order to inform the building control system.

Possible applications

  • Carbon monoxide CO from incomplete combustion
  • open fireplace, gas stoves, Swedish stoves
  • Open fire, barbecue facilities, pellet bunker

PROF. CO ALARM GX-C330

Item no.: 300330
339,00 
The CO ALARM GX-C330 is a carbon monoxide warning device for monitoring indoor areas with open combustion and is equipped with an integrated electro-chemical sensor. An LCD display constantly informs about the operating status as well as the exact measured ppm number of the CO concentration in the ambient air.Possible applications
Possible applications
  • Shisha bars and smoking clubs
  • Monitoring the proper functioning of ventilation systems
  • Laboratory environments in universities, schools and companies
  • Occupational safety measures for open burns in the catering industry
  • Storage of CO in pressure cylinders
 

CO detector according to DIN EN 50291

Item no.: 7549937
269,00 
Monitoring device for safety shutdown of the boiler in case of carbon monoxide leakage. Alarm threshold: 50 ppm CO according to DIN EN 50 291-1 Be sure to check the type plate on the back to find the right sensor for you! You will find the alternative sensor under article number: 7639852

CO detector 40 ppm

Item no.: 7639852
249,00 
Monitoring device for safety shutdown of the boiler in case of carbon monoxide leakage. Alarm threshold: 40 ppm / 1.0 seconds Be sure to check the nameplate on the back to find the right sensor for you! You can find the alternative sensor under article number: 7549937

CO gas sensors

Gas sensor GX-CO

Item no.: 200898-CO
95,00 
External carbon monoxide and smoke sensor for GX-A1+ or GX-HS warning devices, detects all undesirable gases and smoke in the living room air originating from combustion.

Gas detector CO2 - carbon dioxide

CO2 ALARM GX-D1

Item no.: 300251
139,00 
The plug-in CO2 warning device with internal sensor for carbon dioxide is plugged into an upper (tolerant) or lower (sensitive) socket depending on the desired sensitivity, is ready for operation after 3 minutes preheating time and warns when half the MAC (2500 ppm) is reached with a loud alarm tone and red flashing LED.
Possible applications
  • Monitoring of medical practices, waiting rooms, open-plan offices, workshops, etc.
  • for all rooms where people spend long periods of time on a regular basis
  • by the exclus. acoust. Warning ideal for waiting rooms or the like where a visual warning could irritate
  • Reliable reminder to air regularly

GAS ALARM GX-D33

Item no.: 300257
179,50 
  • CO2 warning device for tea kitchens
  • according to DIN6653-2
The GX-D33 with internal sensor for carbon dioxide from pressurized CO2 bottles is plugged into one of the lower sockets located near the CO2 bottles to be monitored, is ready for operation after 3 minutes of preheating time and warns when 3.0%vol. CO2 is reached with a loud alarm sound and red flashing LED. It is the easiest to use CO2 detector for water bubblers with large CO2 bottles in small rooms.
DIN-EN 6653-2 with exceptions

GAS ALARM GX-D2

Item no.: 300252
139,00 
The plug-in CO2 warning device with external sensor for carbon dioxide is simply plugged into a socket and the sensor is placed in an upper (more tolerant) or lower (more sensitive) position depending on the desired sensitivity. It is ready for operation after 3 minutes of preheating time and warns when half the MAC (2500 ppm) is reached with a loud alarm tone and red flashing LED.

GX-D250

Item no.: 300253
199,00 
Professional CO2 warning device for fixed installation with low warning levels from 800 ppm, which is intended to encourage regular ventilation of a room and supports this with discreet warning tones. Similar to a CO2 traffic light, the illuminated plain text display provides information on the interpretation of the warning levels in German, e.g. from 800 ppm "Please ventilate" and from 2000 ppm a potential-free changeover relay switches, e.g. to activate forced ventilation. The CO2 sensor is designed externally to find the optimal level independent of the position of the warning device.

GX-D500P

Item no.: 300263
499,00 
Possible applications
  • Dry ice processing/storage
  • Beverage dispensing systems and greenhouses
  • Meat and sausage cooling
  • according to DIN 6653-2
  • Automatic forced ventilation
  • Rooms with very hot, cold, humid or dusty air or in ventilation systems with draughts
The GX-D500P is a prof. warning device with fixed alarm thresholds at 1.5% CO2 for pre-alarm and 3.0% CO2 for main alarm. Especially suitable for thermally demanding environments. DIN-EN 6653-2 with exceptions

Prof. CO2 warning device for carbon dioxide GX-D500

Item no.: 300267
409,00 
Possible applications
  • for dispensing systems with carbon dioxide (CO2 carbon dioxide)
  • according to DIN 6653-2
  •  Small to medium-sized breweries, wine and fermentation cellars
  • Gastronomy with beverage dispensing equipment
  • Dry ice storage and processing
  • all plants with CO2 from pressure cylinders
The GX-D500 is a prof. warning device with fixed alarm thresholds at 1.5% CO2 for pre-alarm and 3.0% CO2 for main alarm. DIN-EN 6653-2 with exceptions

GAS ALARM GX-D3

Item no.: 300233
229,90 

GAS ALARM GX-D3 with external sensor is a gas detector for carbon dioxide from technical equipment

Possible applications
  • Cold room monitoring
  • Beverage dispensing systems
  • Tea kitchens with water bubblers
DIN-EN 6653-2 with exceptions

Gas sensors CO2 - Carbon dioxide

GX-CO2-30 Carbon dioxide gas sensor

Item no.: 300315
239,00 
Ext. CO2 sensor for carbon dioxide - from technical equipment The external CO2 sensor with its own alarm transmitter, status LEDs and test button is optimized as an accessory for the SCHABUS gas warning devices GX-HS and GX-A1+ is oriented with its warning levels and protection class IP54 to the beverage dispensing system regulation. DIN-EN 6653-2 with exceptions

Gas sensor GX-CO2-25

Item no.: 200989
239,00 
External, active CO2 sensor with its own alarm, LEDs and test button, for connection to the warning devices GX-A1+ or GX-HS, detects CO2 from used air or CO2 exhaled by people, as a timely reminder to ventilate at about half the MAC (2500 ppm).
Performance features
  • External sensor for the gas detectors GX-A1 and GX-HS
  • Mains operation also possible without warning device
  • Detection of carbon dioxide(CO2): Reminder to ventilate regularly

Gas sensor GX-DS Carbon dioxide

Item no.: 200884
179,00 
External CO2 sensor for GX-A1+ or GX-HS warning devices, detects CO2 from used air or CO2 exhaled by humans, as a timely reminder to ventilate at about half the TLV (2500 ppm).

CO2 traffic lights

CO2 traffic light "customized

Item no.: 400370
358,02 
Reminds of regular draught ventilation in case of stale air
Possible applications
  • Monitoring of all dry indoor spaces where there are often / many people, e.g. gastronomy, etc.
  • Reliable reminder for regular draught ventilation

CO2 traffic light "Factory

Item no.: 400360
306,73 
Reminds of regular draught ventilation in case of stale air Warning levels:
  • at 1400 ppm CO2 on yellow
  • from 2000 ppm CO2 on red
  • from 2500 ppm CO2 on red flashing with alarm tone
Possible applications
  • Monitoring of open-plan offices, production facilities, workshops, etc.
  • for all rooms where people spend long periods of time on a regular basis
  • Reliable reminder for regular draught ventilation

CO2 traffic light "Medical

Item no.: 400350
306,73 
The CO2 traffic light "medical" with wall mount and plug-in power supply is our most sensitive version, which already switches to yellow at 800 ppm CO2, from 1200 ppm CO2 to red and from 2000 ppm CO2 to red flashing with alarm tone. It is therefore ideally suited for monitoring rooms in which many people with special physiological restrictions are often present, e.g. waiting rooms in doctors' surgeries or senior residences.   Possible applications
  • Surveillance of doctors' surgeries, hospitals, old people's homes, etc.
  • for all rooms where people spend long periods of time on a regular basis
  • Reliable reminder for regular draught ventilation

CO2 traffic light "school

Item no.: 400250
251,34 
The CO2 traffic light "school" with internal NDIR sensor is an indicator of the carbon dioxide content in the room air and provides a visual warning of increasingly poor air quality in indoor areas where many people frequently spend time and encourages regular draught ventilation. The device is not approved for any other use than described above.

CO2 traffic light OFFICE

Item no.: 400380
249,00 
In the hectic office routine, it is often noticed too late - many different factors cause the proverbial "thick air". Our oxygen supply continuously decreases and we become flabby and tired. Fresh air means more oxygen - thus more well-being and more performance. The CO2 traffic light "office" helps you to ventilate in time, to ventilate for a sufficiently long time and thus to ventilate in a sensible energy-saving way. This way you feel fit again faster - and that is logically also healthier.   Possible applications
  • Room air monitoring in the office according to EU standard EN 13779
  • Individual office, reception offices, open plan office, meeting rooms and more.
  • reliable reminder to ventilate regularly

GX-D11

Item no.: 400311
139,00 
The plug-in CO2 traffic light with internal NDIR sensor, the LED displays red, yellow and green, as well as discreet acoustic support, is used in areas where a reminder for regular ventilation is necessary, but people present should not be unsettled by yellow and red warning colours that are visible from afar.

Accessories for CO2 traffic lights

Ball protection grid for CO2 traffic light

Item no.: 300947
89,00 
protects against hard hits from balls or similar in gyms and kindergartens Application area
  • Sports facilities
  • Gymnasiums
  • Kindergartens

Anti-theft device for CO2 traffic lights

Item no.: 300948
13,23 
Anti-theft device for CO2 traffic lights Application area
  • for installation in public areas (e.g. schools, administrative buildings, etc.)
  • suitable for all SCHABUS CO2 traffic lights

CO2 traffic light - stand

Item no.: 400110
29,00 
Stand is the ideal complement for CO2 traffic lights Application area:
  • if wall mounting is not possible or desired
  • Mounting on horizontal surfaces
 

CO2 traffic light extension cable 6 m

Item no.: 400346
12,50 
DC extension cable black DC plug 2.1 x 5.5

CO2 traffic light extension cable 3 m

Item no.: 400343
10,90 
DC extension cable black DC plug 2.1 x 5.5

Accessories gas detector

Flashing light

Item no.: 200894
119,00 
Indicator lamp for our warning systems  

Signal horn

Item no.: 200982
42,90 
Signal horn for our warning systems!  

Control cable LIYY meter goods

Item no.: 300780
3,90 
Possible applications
  • Flexible cable LIYY (2 x 0.14 mm²)
  • Diameter 3.0 mm
  • Yard goods - determine the total length via the number of pieces

Small horn warning light

Item no.: 200994
129,00 
Small horn with funnel and LED warning light flashing for our warning systems!  

Dust Filter Replacement for GX-C300P

Item no.: 300259
29,90 
Replacement dust filter for CO alarm GX-C300P!

Anti-theft device for plug-in devices

Item no.: 300946
13,23 
for use in public spaces with public traffic makes occasional pick-ups difficult

Level indicator SET

Item no.: 300782
549,01 
Performance features
  • The digital tank display of the current content quantity is optionally in litres, in centimetres of filling level or as a percentage.
  • For various liquids: Heating oil, diesel, biodiesel, vegetable oil, palm oil, rapeseed oil, water, lubricating oils, AdBlue, etc.
  • Up to 2 m water column / oil tanks up to 2.5 m height

USB calibration adapter

Item no.: 200340
48,50 
for regular maintenance by zero point adjustment Every sensor is subject to a natural drift, the zero point (410 ppm) shifts towards

Smoke Detector & Accessories

10-Jahres-Funk-CO-Melder Ei208iW

Item no.: 200720
49,00 
Radio CO detector with 10-year lithium battery operation and audio
  • Surveillance of seminar rooms, classrooms, lecture halls, kindergartens
  • for all rooms where people spend long periods of time on a regular basis
  • Reliable reminder for regular draught ventilation
 

Alarm Controller Ei450

Item no.: 200723
95,00 
Radio alarm controller for smoke detectors and heat detectors and CO detectors! Radio remote control of all CO, smoke and heat detectors from EiElectronics combined in a radio network, locating the triggering detector, common testing, muting and saving the last alarm triggers. Incl. 10-year lithium battery and practical wall bracket.

Radio module Ei200MRF

Item no.: 200722
49,00 
Radio module Ei200MRF for Ei208iW  

Radio module Ei600MRF

Item no.: 200818
72,00 
Radio module Ei600MRF for Ei650iW and Ei603TYC
  • with detailed operating and assembly instructions
 

Extinguishing spray FLS 3484

Item no.: 200832
28,50 
Extinguishing spray 600 ml for fire classes A, B and F!  

Extinguishing spray holder

Item no.: 200835
14,49 
Holder for extinguishing spray 3484  

Smoke detector magnetic holder

Item no.: 201835
9,50 
Magnetic mounting system for all common smoke detector models!

Smoke detector test spray FMZ 4177

Item no.: 200831
22,90 
Function test spray for optical/photoelectric smoke detectors!

FAQ - Frequently asked questions

How do gas detectors work

Apart from the GX-D250, all gas warning devices from Elektrotechnik Schabus work in the same way:
The warning device gives the sensor an operating voltage and some current, the sensor sends the sensor voltage back to the warning device and the warning device interprets the voltage sent back and reacts to it. So simple, so good. So there are some gas warning devices with specialisations, others are more universal, some can interpret more different voltages, others less. Let's illustrate this with the new GX-A1+ (successor to the GX-A1, which has been tried and tested thousands of times), which can interpret the most different voltages so far.
With a few exceptions, all sensors get an operating voltage of 5 volts, which means that the sensor voltage cannot drop below 0 volts and cannot rise above 5 volts. Many years ago, the warning levels "pre-alarm" were set at 2.0 volts and "main alarm" at 2.5 volts. This has remained so until today in order to remain as upward and downward compatible as possible; new sensors are adapted to this. The GX-A1+ evaluates these voltage ranges:

0,0 ... 0,1 VCable break / sensor failureno sensor that works halfway gives off such low voltage
0,1 ... 0,3 VSensor errorThere is something wrong with the sensor, but it is not a broken cable
0,3 ... 2,0 VMonitoring modeIdle, e.g. a GX-SE sensor is factory set to 0.8 V
2,0 ... 2,5 VPre-alarmthe sensor has reacted to "something", it is a prewarning to the alarm
2,5 ... 5,0 VMain alarmthe sensor has definitely detected "something", now full alarm

By the way, the simplest version of the gas detector is the GX-HS, it only knows above or below 2.5 volts, whereby it also reports a cable break or a sensor that is not connected at all as an "alarm", at first glance this cannot be distinguished. And how does the GX-D250 do that? It communicates with its external sensors via pulse width modulation. This is the only way the warning device designed for this purpose can display the CO2 concentration accurately to the ppm.

How the gas sensors work

1. catalytically heated sensors (GX-SE, GX-CFC, GX-B...)

A tin oxide plate heated to just over 300°C represents the upper part of a voltage divider. If gas molecules meet, the resistance decreases and the sensor voltage increases. During the heating phase, the sensor voltage oscillates around significant values, which is why the warning devices ignore all incoming voltages in the first 3 - 5 minutes. A higher current is also required during this time. Units with display show "preheating".

2. NDIR infrared sensors (CO2 traffic lights, GX-D...)
A non-dispersive infrared sensor detects carbon dioxide CO2 via an optical process. CO2 has the property of darkening infrared light of a very specific wavelength (~4μm). In the sensor, an infrared LED shines through a glass filter and this light then passes through the measuring chamber onto an IR brightness sensor. The less light arrives at this sensor, the more CO2 is in the measuring chamber, which is connected to the outside air via a moisture-repellent membrane. The 2-beam sensors used by Schabus additionally measure the light power emitted by the IR LED to compensate for measurement errors caused by aged light sources. A powerful μController controls the process and outputs either a sensor voltage corresponding to the CO2 content, a pulse width modulation (GX-D250) or directly UART, which evaluates and displays the various warning devices and reacts with an acoustic alarm and / or relay switching.

3. electro-chemical sensors (GX-C1pro, GX-C...)
An electro-chemical sensor detects carbon monoxide CO via a chemical reaction with pure water. The sensor consists mainly of its water tank, which is connected to the outside air via an activated carbon disc and a tiny hole. The reaction of CO with H2O produces CO2, hydrogen and two free electrons. The number of electrons is therefore a direct measure of the CO concentration and can be measured amperometrically. The electron current is in the lower nA range, about 1.5 nA / ppm CO. It is therefore not possible to connect such a sensor directly to a warning device. Instead, the measuring electronics must be located very close to the sensor and be designed to be extremely sensitive and precise. Operational amplifiers provide the conversion into a calibrated voltage, the evaluation is then carried out via ADC in a 32-bit μController. Elektrotechnik Schabus has had the success of this complex development of the measuring cell checked by TÜV Süd in accordance with DIN 50291, stability and precision have been certified for the system and all CO warning devices offered carry this measuring cell with the electrochemical sensor.

Urban and natural gas, what is that actually?

Let's start with town gas, which no longer exists. It was produced from coal gasification and contained quite a high proportion of toxic carbon monoxide, see page 74. Town gas existed until about the end of the 1970s, in West Berlin until the mid-1990s. It was gradually converted to natural gas, which was not quite so toxic. To do this, the incinerators had to be rebuilt, and different seals and valves were needed. However, the name "town gas" is still present in the population, which is why we still call our sensor for combustible gases the town and natural gas sensor (SE). Natural gas, the gas that our municipal utilities and gas suppliers supply us with today for heating, hot water production and cooking, is a naturally occurring gas that is mainly a by-product of oil production, but also comes from pure natural gas fields that do not supply oil. The main component of natural gas is the highly flammable gas methane with up to 90% by volume. Other substances besides butane and propane are various traces of sulphur compounds, ethane, CO2, noble gases, nitrogen and water vapour. Once extracted, natural gas is purified of toxic and unusable substances such as water, hydrogen sulphide and carbon dioxide and fed into our gas supply system, not without first adding the sulphur compounds thioether or alkanethiol to give the gas its typical odour, which we perceive quite naturally as the smell of gas. Without these additives, natural gas would have no smell at all. Every combustible gas that is sold has to be mixed with these substances to produce an odour. So we already have the best gas sensor right in our face: our nose. Now, fortunately, our nose is not always located exactly where gas could unintentionally escape. At the various connections of our gas pipe, at the transfer point, at the gas tap, at the meter and directly at the heating, cooker or boiler. Here, mostly in the so-called heating and utility rooms (HWR), but also in the kitchen directly at the gas cooker, the "city and natural gas warning detectors" from Elektrotechnik Schabus come into play. They immediately detect if gas is leaking and warn of a pipe defect with a loud penetrating tone and, if necessary, switch off a connected solenoid shut-off valve so that no further gas can flow in. Since natural gas consists largely of the very light methane, it is lighter than air and immediately evaporates upwards when it escapes. A GX-SE sensor must therefore be placed at the top of the room to immediately detect the gas. But not at the very top, but about 30 cm below the ceiling, because there is so-called dead space in the corners. Air that is in the corners and edges on the ceiling cannot escape and displaces the gas. Gas from bottles (butane/propane) is heavier than air, so the sensor is placed 15-30 cm above the floor.

At what point does escaping gas become dangerous?

There is the term "lower explosion limit", it is abbreviated to LEL and given as a percentage. A gas-air mixture only becomes explosive when 100% is reached. It is important to know that it is not only the amount of gas that escapes that is decisive, as is the case with CO, which is easily expressed in ppm, but that other variables also play a role. Be it the temperature, the humidity or the oxygen content, because every combustion necessarily needs oxygen, otherwise nothing will burn. If the humidity is higher, there is less oxygen, if the temperature is higher, there are fewer particles in the room that can react with each other. These three variables are taken into account by our SE sensors and converted into a voltage that is detected by the warning devices. Now, one could warn immediately if even one molecule is detected or, more realistically, at e.g. only 3% LEL, but no customer would accept such a behaviour in the long run. Up to 5% LEL, a supposed false alarm occurs more frequently than one might associate with a gas pipe defect. The sensors could do that, but who wants a warning when open paint and varnish cans outgas or someone walks past the sensor with freshly painted nails or freshly applied perfume? Solvents, among many other household substances, are in fact very similar to the hydrocarbons in town and natural gas and are just as well detected by the sensors. Some of the many DIN standards dealing with the detection of natural gas in the home recommend a warning at the latest when the 20% LEL limit is reached. Since our sensors detect liquid gas (LPG with a high proportion of butane and propane) just as well, we have agreed on an early warning level of 12% LEL. Always in time, so that it doesn't become dangerous, but sufficiently tolerant to avoid frequent false alarms. And of course within the standard.

Where does the carbon monoxide come from, who mixed it into my gas?

Carbon monoxide is not supplied. It is produced in any combustion in which not enough oxygen is available. Every gas molecule (e.g. CH4 = methane) needs two oxygen molecules (O2) for complete combustion, a carbon dioxide molecule (CO2) is then produced in addition to two water molecules (H2O), which is not nearly as dangerous as a carbon monoxide molecule (CO). Gas is strong and desperate to burn. If there is not enough oxygen available, two gas molecules share an oxygen molecule and carbon monoxide is produced in addition to hydrogen.

CH4 + 2 O2 -----> CO2 + 2 H2O (complete)
or
2 CH4 + O2 -----> 2 CO + 4 H2 (incomplete)

There must be enough oxygen at the place of combustion and not somewhere in the room. This easily explains why CO is produced in probably every combustion device (boiler, heater, ...). A nozzle clogged with dust is enough. Or a retrofitted, tightly insulated house. This is easy to recognise in visual combustion when you see a yellow component in the flame. Complete combustion with sufficient oxygen always shows up blue, although a yellow component in it is not always easy to recognise. By the way: methane gas is only mentioned here as an example, of course this also applies to all other combustions, such as butane, propane, oil, paper, cardboard, wood and pellets. All combustions require sufficient oxygen!

What happens in our body when we breathe in CO - carbon monoxide?

Every cell in our body also burns oxygen in order to function properly. To do this, we breathe in oxygen, which docks with the haemoglobin (red blood cells) in the alveoli and is transported to the cells with the bloodstream. This is where the combustion takes place: The oxygen molecule is taken from the blood corpuscle and the carbon dioxide molecule CO2, which comes from the (complete) combustion, is reattached to the blood corpuscle for removal, which transports it to the lungs for exhalation. But when we breathe in CO in the air mixture, it becomes critical. The haemoglobin only recognises the oxygen particle O in CO and attaches it about 300 times as strongly as pure oxygen. However, the cell cannot do anything with CO and sends it back to the lungs for exhalation. There, however, no exchange takes place, because oxygen O is already strongly attached to haemoglobin, so we do not simply breathe out the CO again. On average, this only happens after about 20 minutes, the CO accumulates in the blood with every breath, and at the same time there are fewer and fewer blood cells that can still absorb oxygen. That is the toxic thing about carbon monoxide. A lack of oxygen stops the work of the cells, especially the CNS, the heart and the brain, you get tired, fall asleep and in the worst case die. By suffocation despite breathing. In the case of acute CO poisoning, only pure oxygen can help, ideally in a pressure chamber.

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