Microsensorcorp MDM491 Differential Pressure Transmitter

Microsensorcorp MDM491 Piezoresistive Differential Pressure Transmitter is a compact full-welded (no sealed ring) differential measurement element. Silicon oil is filled in between the die and two diaphragms, when the measured differential pressure is added on two diaphragms, the pressure could be transferred onto the die through silicon oil.

Sensor die connects with amplifier circuit through wires, using semiconductor piezoresistive effect, transforming differential pressure signal into an electric signal. The output signal from Weston Bridge on the sensing die has a good linear relationship with differential pressure, so the measured differential pressure could be measured precisely.

The whole product is used for differential pressure measurement of various gases and liquids in the pipeline in many fields including petroleum, chemical industry, power station, and hydrology, etc

Microsensorcorp MDM491 Features

Full stainless steel construction, compact size, easy installation;
Welding and fully-sealed construction; housing protection IP65;
Using piezoresistive differential pressure sensor, 316L isolated diaphragm;
Temperature compensation and aging, stable performance;
Zero and span adjustable outside for plug connection version.

Application

Industrial process control
Differential pressure measurement
Gas, liquid pressure measure
Pressure checking meter
Pressure calibrator
Ventura and eddy-current flow meter

Electrical Performance

Power Supply: 15V~28V DC
Output Signal: 4mA~20mA DC(2-wire); 0V/1V~5V/10V DC, 0mA~10mA/20mA DC(3-wire)
Electrical Connection: plug or cable
Response Time: (10%~90%): ≤1ms
Insulation Resistance: 100MΩ, 50VDC

Construction Performance

Housing: SS 1Cr18Ni9Ti
Diaphragm: SS 316L
Filled liquid: silicon oil

Microsensorcorp MDM491 Specifications

Range Code	0A	02	03	07	08	09	10	12
Unit	KPa						MPa
Pressure Range	0~35	0~70	0~100	0~200	0~350	0~700	0~1	0~2
+overpressure	70	150	200	400	700	1400	2.0	4.0
-overpressure	35	70	100	200	350	700	1.0	1.0
Static Pressure	≤20MPa

Notes

We suggest to install a tri-valve between the measured point and transmitter to protect the media adding on the transmitter’s positive and negative cavities slowly;
We suggest to make two pressure ports horizontally to reduce the installation direction effect;
Please pay attention that the static pressure should be less than 20MPa, transmitter positive and negative cavity should be in the rating pressure range;
Digital indicator information, please refer to MPM480 datasheet;
If the user has a special requirement, please feel free to contact our