Air flow monitor RLSW5

Air flow monitor - solenoid shut-off valve (gas)
This control unit ensures the mutual interlocking of an exhaust air system (extractor hood) and the gas supply for the oven and gas hobs in the catering industry. The gas supply to the oven is only released when the exhaust air system is switched on. This is controlled by the air flow monitor in the exhaust air system.

The air flow monitor is placed in the exhaust air flow of a cooker bonnet behind the grease filter and monitors whether the exhaust air really flows at the required and adjustable speed. If this is the case, a potential-free changeover relay is switched, which releases the gas supply for gastronomic gas hobs by means of a gas solenoid shut-off valve. The airflow monitor is the basis for the so-called "mutual interlocking of exhaust air and gas supply".

The key switch is only used to ensure that the gas supply can still be switched on in the event of a defect in the air flow monitor in order to prevent economic damage to the catering business. This may only be done in exceptional cases and under controlled supervision; the ventilation system must be running!

The flow monitor works according to the calorimetric principle and monitors air flows for exceeding or falling below a previously set threshold value. With the calorimetric measuring principle, a temperature-sensitive resistor is heated. The heating process is carried out by a separate heating resistor. A flow in the medium dissipates heat from the measuring resistor, the temperature of the resistor changes and so does its resistance value. This change is evaluated. However, not only the speed of the flowing medium, but also its temperature has an influence on the amount of heat dissipated, so a relationship between flow and temperature must be established. This is done via a second temperature-dependent measuring resistor near the first. The second measuring resistor (temperature compensation) is not heated and is used for temperature measurement.

Air flow monitor - Solenoid shut-off valve (gas) - Key switch

This control unit ensures the mutual interlocking of an exhaust air system and the gas supply for the oven in the catering trade. The gas supply to the oven is only released when the exhaust air system is switched on. This is controlled by the air flow monitor in the exhaust air system. The key switch is only used to ensure that the gas supply can still be switched on if the air flow monitor is defective, in order to prevent economic damage to the catering business.

This may only be done in exceptional cases and under controlled supervision. The ventilation system must be running!

Performance features

• Signal output flow: 1x changeover contact Current and contact rating: 250 V AC, 6A, 1.5kVA
• Mounting flange PG7 / installation depth exhaust pipe 130 mm
• Start-up delay: 60sec. (jumper can be activated)
• Type approval by TÜV NORD according to DIN EN 61010-1:2002-08
• The flow monitor is only suitable for laminar and low-turbulence flows
• The flow monitor is independent of the installation position

Scope of delivery

• 1 Air flow monitor
• 1 Flange

Connection example

Technical data

WEEE NO.: EN91394868