The residual pressure transducer is a device used to detect the air pressure of the fire exit. Usually, the air pressure of the fire exit needs to be higher than other rooms and areas to prevent the smoke and harmful gas from overflowing into the fire exit. When the pressure value of the device is lower than the normal value, it means that there is a safety hazard risk in this fire passage.
Features
* CQC certificated
* For fire fighting system Application
| Measurement | range 0～±100Pa |
| Accuracy (a) | ±1%F.S |
| Working temperature | (－20℃~75℃ |
| Compensated temperature | (－5℃~60℃ |
| Protection Grade | IP30 |
| Power Supply | 24VDC±2.4V |
| Consumption | ≤0.75W |
| Trachea connection | （+）High voltage side，（-）Low pressure side; adopt 3.5mm inner diameter hose |
| Instructions | Green status, red alarm indicator |
| Display method | With display/without display |
| Measured medium | Air and non-corrosive gas |
| Control signal(b) | switching value |
| Communication mode | Two bus (two-wire system)/RS-485 (four-wire system) |
| Withstand voltage | 1000Pa |
a) Accuracy is obtained by testing at room temperature 25℃; b) Connecting resistive load (optional)
Code and description | Notes | |||||
LFM208 | Model | |||||
2530 | 20~30pa | Measurement range | ||||
4050 | 40~50pa | |||||
N | without display | Screen display | ||||
D | display | |||||
R | R=RS485 | Communication mode | ||||
P | P=Pb Two -bus | |||||
LFM208 | 2530 | D | R | Model selection example | ||
Note: For example, when LFM208-4050-DR is selected, the operating pressure of the residual pressure transmitter is 50Pa. The reset pressure is 40Pa. With screen display, RS485 communication output.
The residual pressure transmitter panel has two indicators: a green status indicator and a pressure alarm indicator;
1. Status indicator: Under normal working condition, the green indicator light is on; under the equipment failure condition, the green indicator light flashes;
2. Alarm indicator: During pressure measurement, when the air pressure is lower than the reset pressure, the alarm light is always on. If the air pressure is higher than the operating pressure. The alarm light flashes. When the pressure is between the reset pressure and the operating pressure, the alarm light is off;
If the product has a pressure display window, the pressure value can be directly displayed;
Adopt American imported pressure sensing element
Elevator front room and staircase of high-rise building
Basement and refuge
Pressure monitoring in hotels, shopping malls, hospitals and
other public places
Compliant with The National Standard
《Technical Standard for Smoke Management System in Buildings》
Pressure monitoring for fire exits. And prevent the leakage of toxic gases and dense smoke when fire broke out.
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