This flow monitor operates according to the calorimetric principle and monitors air flows for exceeding or falling below a previously set threshold value. In 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 carries heat away from the measuring resistor, the temperature of the resistor changes and thus also its resistance value. This change is evaluated. However, not only the velocity of the flowing medium but also its temperature has an influence on the amount of heat dissipated, so a relation between flow and temperature must be established. This is done by means of a second temperature-dependent measuring resistor close to the first one. 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 industry. The gas supply to the oven is only released when the exhaust air system is switched on. This is controlled by the airflow switch in the exhaust system. 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 airflow 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 at the same time!
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
Technical data
| Operating voltage: | 230 V AC (+/-10%) / 50-60 Hz |
| Power consumption: | 4 VA max. |
| Signal output flow: | 250 V AC, 6 A, 1.5 kVA (1 changeover contact) |
| Media temperature range: | -10° C / +80°C |
| Temperature gradient: | 15 K/min |
| Ambient temperature: | -20° C / +60° C |
| Switching point: | Adjustable via potentiometer |
| Measuring range: | 0.1-30 m/s |
| Response time:: | 1..10s |
| Protection class enclosure: | IP54 (IP65) |
| Protection class sensor: | IP67 |
| Dimensions (HxWxL): | 80 x 84 x 56 mm |
WEEE NO.: EN91394868
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