MDM490 Differential Pressure Transmitter

Introduction MDM490 uses piezoresistive differential pressure sensor as  sensing element. Silicon oil is filled in between die and two  diaphragms, when measured differential pressure is added on two  diaphragm, the pressure could be transferred onto die through  silicon oil. Sensor die connects with amplifier circuit through  wires, using semi-conductor’s piezoresistive effect, transforming  differential pressure signal into electric signal. The whole product  is used for differential pressure measurement of petroleum, chemiindustry, power station and hydrology, etc.
Electric Performance • Power supply: 2-wire 15V~28V DC; 3-wire 15V~28V DC • Output signal: 2-wire 4mA~20mA DC; 3-wire 0/1V~5V DC，   0mA~10/20mA DC • Electrical connection: plug connection or Φ7.2mm 7-pin cable • Response time(10%~90%): ≤1ms • Insulation resistor: 100MΩ,500V DC Construction Performance • Housing: stainless steel 304 • Diaphragm: stainless steel 316L • O-ring: Viton • Filled liquid: silicon oil
Features • Full stainless steel construction, compact  size, easy installation; • Laser welding, full-sealed construction;  protection IP65; • Using piezoresistive differential pressure  sensor, 316L isolated diaphragm; • Temperature compensation and aging,  stable performance; • Zero and span adjustable outside; • Ex-proof version MDM490 conforms to  GB3836.4 Exia Ⅱ CT6 Ga standard; ex-proof certificate is approved; • Ship-use product conforms to CCS  Rules of Classification of Sea-going  Steel Ships(2018); ship-use certificate is  approved; • CE and RoHS certificates.