Fischer ME49 – Explosion proof pressure transmitter – liquids, gases

Fischer ME49 is ATEX certified explosion proof hazardous area zone 1, 2 approved pressure transmitter for aggressive liquids and gases. It is high accuracy, robust, industrial shock & vibration resistant pressure instrument.


Fischer ME49 – micro-controller based pressure transmitter – aggressive liquids, gases – Zone 1, 2

pdf-imagehigh accuracy, micro-controller based, stainless steel membrane / diaphragm pressure transmitter, gas explosion proof Zone 1, 2 certified
Make: Fischer Messtechnik (Germany)
Model: ME49


Fischer ME49 is high accuracy, microcontroller based pressure transmitter. It is equipped with ceramic membrane / diaphragm gauge head, suitable for accurate measurement of positive or negative pressure in hazardous (explosion proof / flameproof) areas.

The 2-wire pressure transmitter ME49…with resistance type measuring cell serves as exact pressure measurement equipment in explosion-hazardous areas gas explosion proof for Zone 1, 2. It must be used with protection “intrinsic safety“ category “ib“.

The maximum permissible ambient temperature range of -20°C to +60°C may not be exceeded.

Declaration per Directive 94/9/EC (ATEX) (gas explosion proof hazardous area Zone 1, 2)
Ex II 2 G EEx ib IIC T6

It is suitable for all liquids and gaseous media, including aggressive media.

Fischer ME49 - ATEX intrinsically safe pressure transmitter - liquids, gases, microprocessor based
Fischer ME49 – ATEX intrinsically safe pressure transmitter – liquids, gases, microprocessor based

Working Principle:

The measuring pressure is applied directly on stainless steel non-corrosive membrane. The applied pressure creates deformation on sensor membrane.
This deformation alters the output signal of the strain-gauge bridge attached to the rear of the membrane.

An electronic circuit integrated into the device converts the bridge signal into a standardized electrical output signal.

By recommended accessories MZ5… the instrument can be

  • depressurized or shut down,
  • cut off a plant to enable controlling or repairing,
  • Operational checked on site.

The shut-off valves offer to vent the connected pipework by vent screw.

Key Features:

  • High pressure of measurements
  • Direct measuring sensor without transfer fluid
  • Good long term stability
  • Ingress protection IP65
  • Shock resistant stainless steel design

Key Specifications:

  • Measuring range:
    • 0.0 ~ 40.0 mbar to 0.0 ~ 1.0 bar (safe overpressure: 4.0 ~ 10 bar)
    • 0.0 ~ 1.6 bar to 0.0 ~ 40.0 bar (safe overpressure: 4.0 ~ 60 bar)
  • Linearity: ± 0.5% full scale
  • Hysteresis: < 0.1% full scale
  • Permissible ambient & media temperature: -20° C ~ +60° C
  • Supply voltage: 24 VDC
  • Signal output: linear, proportional 4~20mA, 2-wire
  • Temperature coefficient (zero): 0.4% full scale / 10K
  • Temperature coefficient (span): 0.05% full scale / 10K
  • Electrical connection: internal terminal strip, M16 x 1.5 cable gland
  • Protection class: IP65 per DIN EN 60529
  • Material (air / gas, contact parts): stainless steel .14571, ceramic, FPM (fluorelastomere)
  • Material, housing: coated aluminium


Industrial areas:

  • Nuclear power plants
  • Thermal / gas fired power plants
  • Gas supply
  • Material processing
  • Environment technology
  • Process engineering