LEFOO LFM31 Series Quick Start Manual

LFM31

Features

Manual button Zero calibration and full scale adjustment
■
RS-485 serial communication, support standard ModBus RTU protocol
■
Built-in buzzer with sound-light alarm,field programmable
■
alarm pressure value.
Housing made of FR-ABS,satisfactory impact resistance and
■
heat resistance etc.

Description

The LFM31 series is a highly integrated, multi-functional digital, smart transmitter. Adopt mature and
reliable sensor technology. Combined with advanced micro-controller technology and sensor digital
conversion technology designed. LCD display, clear and accurate readings. The core controller adopts
imported single-chip microcomputer, its powerful function and high-speed computing ability ensure the
excellent quality of the transmitter. It can be equipped with on-site segment LCD display. RS-485
network communication can read the current pressure value of the target device in real time. Meanwhile
the LFM31 series has 0~5VDC, 0~10VDC or 4~20mA output modes (individual voltage or current three-
wire output, voltage and current Three-wire output at the same time), Mainly used in the intelligent
building energy management system, to measure the precise pressure and flow required for building
pressurization and air flow control.

Specification

Measurement range
Unit
Accuracy
Working Temperature －20℃~70℃
Compensated
Temperature
Protection Grade
Output Signal
Power supply
Consumption
Pressure connection
Housing material
Certification
Electromagnetic
compatibility
Lightning protection
Display
Weight
01
ZHEJIANG LEFOO SENSING TECHNOLOGY CO.,LTD / LEFOO INDUSTRIAL CO., LTD
Series Differential pressure gauge
0～± 100Pa, 0～± 1,000Pa, 0～± 10,000Pa
Pa、 KPa、mBar、mmHG、inWC、mmWC,
± 1%F.S
－10℃~60℃
IP54
0~5V 0~10V
12~30VDC
≤0.75W
Plastic concave interface
UL94-V0/ABS Industrial plastics
ROHS,CE
Electromagnetic radiation: EN50081-1/-2; electromagnetic sensitivity:
EN50082-2
Air conduction withstand voltage 8000V, shell and cable conduction withstand
voltage 4000V (customized)
80*40mm LCD display
315g
4~20mA
https://en.lefoo.com.cn
RS485
export14@lefoo.com