DWYER Series AT-MS ATEX/IECEx Approved Magnesense® Differential Pressure Transmitter

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Series AT-MS ATEX/IECEx Approved Magnesense® Differential Pressure Transmitter

Series MS in Flame-Proof ATEX/IECEx Enclosure

The Series AT-MS ATEX/IECEx Approved Magnesense® Differential Pressure Transmitter is an extremely versatile transmitter for monitoring pressure and air velocity in hazardous areas. This transmitter is loaded with features such as: field selectable English or metric ranges, field upgradeable LCD display, adjustable dampening of output signal and the ability to select a square root output for use with pitot tubes and other similar flow sensors. Along with these features, the magnetic sensing technology provides exceptional long term performance and enables the Magnesense® transmitter to be the solution for a myriad of pressure and flow applications. Flameproof enclosures are available in aluminum and can include a glass window for viewing process on the LCD.

Important notes for installation:
• Cables must be fitted through 1/2″ NPT cable gland or ATEX/IECEx conduit (not supplied with instrument).
• Make sure after cabling to close tight cover and cable gland, in order to maintain IP66 rating.
• Open cover only after de-energizing instrument.
Attention: Check local safety rules and warnings on unit and manual for a correct use of the instrument in hazardous areas.


Product Applications

  • Monitor pressures in ducts, rooms, or total building pressures
  • Filter monitoring
  • Local indication of clean room pressures with process signal sent to control room
  • Hazardous area pressure measurement and transmitter



  • All the capabilities and value of the MS2 in an ATEX/IECEx approved enclosure
  • Long service life and minimized downtime due to durable, rugged housing and high-quality components
  • High impact strength and high temperature rated for applications where hazardous environments exist
  • Increased response time at low pressures with LD port configuration



  • Service: Air and non-combustible, compatible gases.
  • Wetted Materials: Consult factory.
  • Accuracy: MS-X21: 0.5 in w.c. and 0.25 in w.c.: ±1%; 0.1 in w.c.: ±2%; 100 Pa and 50 Pa: ±1%; 25 Pa: ±2%. MS-X11: 5 in w.c. and 2 in w.c.: ±1%; 1 in w.c.: ±2%; 1250 Pa and 500 Pa: ±1%; 250 Pa: ±2% (@ standard conditions).
  • Stability: ±1% FS/year.
  • Temperature Limits: 0 to 150°F (-18 to 66°C) (Note: Product temperature limits differ from case).
  • Pressure Limits: 1 psi max., operation; See pressure limit chart on catalog page for burst.
  • Power Requirements: 10-35 VDC (2-wire); 17-36 VDC or isolated 21.6-33 VAC (3-wire).
  • Output Signals: 4-20 mA (2-wire); 0-5 V, 0-10 V (3-wire).
  • Response Time: 300 ms.
  • Zero and Span Adjustments: Digital push-button. In safe zone only.
  • Loop Resistance: Current output: 0 to 1250 Ω max.; Voltage output: min. load resistance 1 kΩ.
  • Current Consumption: 40 mA max.
  • Display: 4 digit LCD.
  • Electrical Wiring: 4-20 mA, 2-wire: European style terminal block for 16 to 26 AWG. 0-10 V, 3-wire: European style terminal block 16 to 22 AWG.
  • Mounting Orientation: Diaphragm in vertical position.
  • Enclosure Rating: IP66.
  • Housing Material: Aluminum.
  • Finishing: Texture epoxy coat RAL7038.
  • Process Connections: 1/8″ NPT female brass (SS optional).
  • Electrical Connections: Two 1/2″ NPT female. Cable gland not included.
  • Weight: 11 lb (5 kg).
  • ATEX Certificate: INERIS 21ATEX0033X.
  • IECEx Certificate: IECEx INE 21.0064X.
  • Agency Approvals:
  • ATEX Compliant: CE 0080 EX II 2G Ex db IIC T5, T6 Gb -60°C ≤Ta ≤+50°C (T6) -60°C ≤Ta ≤+60°C (T5) II 2D Ex tb IIIC T75 °C Db;
    IECEx Compliant: Ex db IIC T5, T6 Gb -60°C ≤Ta ≤+50°C (T6) -60°C ≤Ta ≤+60°C (T5) Ex tb IIIC T75°C Db.