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Lefoo Differential Pressure Transmitter LFM33

LEFOO LFM33 micro differential pressure transmitter/controller adopts high-precision MEMS digital pressure sensor, which can detect positive pressure, negative pressure or differential pressure products with optional analog signal 4~20mA & 0~10V or RS485 signal output; optional relay switch control, supporting a variety of working mode settings to match the actual application requirements; can independently set the relay switch action pressure point; through the internal The pressure unit can be switched and the digital damping filter can be edited on the spot, which is widely used in air or neutral gas detection and control. Suitable for all kinds of ventilation, air conditioning systems and equipment gas pressure detection, clean rooms, laboratories, gas pipeline filter resistance of differential pressure detection applications.

 

Features

* High precision MEMS digital pressure sensor to detect positive, negative or differential pressure

* Multifunctional product combining LCD digital display, switch control and transmitter output

* Adjustable internal range output range, multiple pressure units can be switched

* Built-in buzzer, provide sound and light glance, can set the alarm pressure value range on site

* RS-485 serial communication, support standard Modbus RTU protocol

Flame-retardant ABS shell, with good impact resistance, heat resistance and other properties

Specification of Differential Pressure Transmitter LFM33


Technical Benchmark

Measurement range

±100Pa,±1000Pa,±10000Pa

Accuracy

±1%F.S

Measured Medium

Air or non-corrosive gases

Storage Temperature

-20℃~70℃

Protection Grade

IP65

Output Signal

4~20mA&0~10V

RS485

Control Signal

SP1 Relay Output

SP2   Relay Output

Relay Type

2 SPDT relays    3A@250VAC/30VDC

Power Supply

16~30VDC

Consumption

≤2.5W

Pressure Connection

Plastic Concave Interface

Housing Material

ABS   Industrial plastic (UL94-V0)

Certification

ROHS, CE

Electromagnetic Compatibility

Electromagnetic   transmit: EN50081-1/-2

Electromagnetic sensitivity:   EN50082-2

Display

80*40mm LCD Display

Weight

328g



How to Select
LEFOO How to Select LFM32

Code and   Description

Remark

LFM33


Model

6

-100~100pa

Measurement

range

0

-1000~1000Pa

2

-10000~10000Pa



A

4~20mA&0~10V

E

RS—485

Output Mode



P

Plastic panel (round)

Installation

panel

S

Stainless steel panel (square)


F

Front panel air intake

Air intake

method


B

Rear panel air intake

LFM33

0

A

P

B

Example



Connection Mode


LEFOO Connection Mode LFM32


Features of Differential Pressure Transmitter LFM33

■  Various switchable pressure units

■  Support multiple working modes

■  Built-in buzzer with sound-light alarm, the field-programmable alarm pressure value

■  RS-485 serial communication, support standard Modbus RTU protocol

■  Housing made of FR-ABS, satisfactory impact resistance and heat resistance etc.

■  The Max. and Min. pressure range of discrete output can be set


Various pressure units can be switched to view the lowest and highest pressure values. It also provides an acousto optic alarm and digital damping filtering degrees can be programmed on-site. The product adopts imported micro-pressure core body, digital pressure acquisition, and temperature compensation, with sensitive pressure response, long-term output stability, superior temperature performance, and other characteristics.


Applications of Differential Pressure Transmitter LFM33

Air or neutral gas detection control

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