LFM11 Series Differential Pressure Transmitter

Feature

Low Differential Pressure Transmitter LFM110/LFM112 are engineered for building automation in the HVAC/R industry, pressure and flow monitoring, and low differential pressure test in industry application.

This is an upgraded version of LFM108 with digital display,small and light, suitable for installation.

It is a differential pressure transmitter, which is specifically developed to measure very low differential pressure , for low pressure applications such as for air flow monitoring and control , and for manometers as well as medical devices.

Application:

Heating, Ventilation and Air Conditioning (HVAC)

Energy Management System

Static Duct Pressure

Clean Room Pressure

Indoor air pressure monitoring

Air filter monitoring

Over Pressurization and Furnace Draft Control

Media: Air and neutral gases

Differential pressure range can be set on request.

Input voltage: 16~30Vac/Vdc

Output signal: 0~10V and 4~20mA?2 wire

output: can be used at the same time.

LCD backlight digital display.

Auto zero calibration when switch on.

Manual zero calibration.

ABS industrial plastic cover: IP65protection

Rotation is fixed on the backboard.

Specification

Range	LFM110 -1000~+1000Pa Minimum 0~+100Pa LFM112 -10,000~+10,000Pa Minimum 0~+1000Pa LFM116 -100~+100Pa Minimum 0~+10Pa
Accuracy	±1.0%FS
Pressure unit	Pa, mmH2O, mbar, inWG, mmHG, daPa, KPa, hPa
Output signal	0~5VDC / 0~10VDC / 4~20mA / RS-485 Analog signal: current type 2-wire , voltage type 3-wire, current and voltage type 6-wire; Digital signal: RS-485 4-wire
Supply voltage	2-wire output: supply voltage is 16~30VAC/VDC, can be collocated with 24VDC adaptor(3.5x1.35mm) Current type 2-wire output: supply voltage is non-polarized 12~30VDC (The positive pole and negative pole of voltage can be connected in a contrary way) Voltage type 3-wire output: supply voltage is 16~30 VAC/VDC. RS-485 4-wire output: supply voltage is 12~30 VAC/VDC
Power consumption	≤1.5W
non-polarized: The input power is not divided into positive or negative

Mechanical Specification

Material: industrial plastic, flame retarded rating: UL94-V0

Protection Grade: IP65

Display: LCD display: 50 x 22.5 mm

Number Height: test value at 10 mm, unit at 5 mm

Pressure Connection: metal barb connection, Ø 6.2 mm

Cable Connection: max diameter: Ø 8 mm

Weight: 140g

Transmitter Function

Response Time	0.5s, 1s, 2s, 4s
Resolution	LFM110 LFM112	1Pa,0.1mmH2O,0.01mbar,0.004inWG, 0.007mmHG,0.1dapa,0.001KPa,0.01hPa
	LFM116	0.1Pa,0.01mmH2O,0.01mbar,0.01dapa,0.001hPa
Zero Calibration	Manual with push button or automatic at starting for zero calibration
Media	Air and neutral gases
Tolerated Overpressure	15KPa (LFM110) - 150KPa (LFM112) - 4.5KPa (LFM116)
Operating Temperature	-10~+60°C
Storage Temperature	-10~+70°C