Lefoo Multi-Function Differential Pressure Transmitter LFM73

The LFM73 series of multi-function digital display differential pressure transmitters/controllers use a high-precision MEMS sensor, LED digital display and transmitter output to detect the pressure difference; it can completely replace the pointer-type mechanical pressure gauge; The pressure measurement range and pressure unit of this differential pressure transmitter can be easily adjusted on site through buttons. It adopts an IP65 protection grade housing and is suitable for energy management systems, heating, ventilation and air conditioning (HVAC), VAV and fan control, environmental pollution control, static pipeline and clean room pressure measurement, smoke hood control, oven pressurization and boiler ventilation control and other fields.

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Specification
Features
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Specification of Multi-Function Differential Pressure Transmitter LFM73

Measured Medium	Air or non-corrosive gases
Measurement range	+100Pa,+1000Pa,+10000Pa
Overload pressure	5KPa(+100Pa); 10KPa(+1000Pa); 80KPa(+10000Pa)
Accuracy	+1.0%FS
Operation Temperature	-20°C~80°C
Compensated Temperature	-10°C~60°C
Storage Temperature	-40°C~85°C
Response time	0.5s (default) / 1.0s / 2s / 4s
Protection Grade	IP65
Pressure Connection	Concave Interface Φ 6.5 mm
Output Signal	4~20mA(three wire) / 0~10V / RS485
Control Signal	2*SPST, 3A-30VDC / 250VAC
PowerSupply	16-30VDC / 24VAC+20%
Wiring method	Cable leads from the back
Consumption	≤1.5W
Housing Material	Cast aluminum housing, PC panel
Communication	RS-485 standard interface, Modbus RTU protocol
Key	Three tap keys
Display	4 bit 0.8" nixie tube
Weight	390g

Size Chart:

英文-LFM73规格书20.0_2_01(1).png

Product model	Cable color	Red	Black	White	Green	Brown	Yellow	Gray	Blue
LFM73X-ANXX LFM73X-ABXX	Electrical signal	+24V	GND	Vout	Iout
LFM73X-ENXX LFM73X-EBXX	Electrical signal	+24V	GND	A+	B-
LFM73X-NRXX LFM73X-NDXX	Electrical signal	+24V	GND			Normally open contact NO1	Public end COM1	Normally open contactNO2	Public end COM2
LFM73X-ARXX LFM73X-ADXX	Electrical signal	+24V	GND	Vout	Iout	Normally open contact NO1	Public end COM1	Normally open contactNO2	Public end COM2
LFM73X-ERXX LFM73X-EDXX	Electrical signal	+24V	GND	A+	B-	Normally open contact NO1	Public end COM	Normally open contactNO2	Public end COM2
LFM73X-HNXX	Electrical signal	+24V	GND	A+	B-	Iout

REMlINDER: For other product models, please refer to the information on the surface of the product for specific wiring methods.

Installation Precautions:

Installation and wiring should be performed by qualified technicians. The power should be turned off during wiring. When the transmitter is powered by a 24VAC power supply, it is recommended to use a transformer-isolated AC power supply. When the transmitter shares a 24VAC power supply with other equipment, it is necessary to ensure a reliable connection between 24V and GND. Otherwise, there may be unpredictable situation, or even damage to the equipment.

Features of Multi-Function Differential Pressure Transmitter LFM73

High-precision MEMS digital pressure sensor to detect positive pressure, negative pressure or pressure difference, a better alternative to the traditional pointer mechanical watch.
Versatile product that combines high-lighted LED digital display, switch
control and transmitter output.
The output range of the internal range is adjustable, and a variety of
pressure units can be switched.
Built-in buzzer, provide sound and light alarm, can set the alarm pressure value range on site.
Optional relay output or alarm, and at the same time LED indication.
RS-485 serial communication, support for standard Modbus RTU protocol.
Cast aluminum shell, with good impact resistance, heat resistance and so on.
No moving parts, shock-proof.