Series AT2MS ATEX/IECEx Approved Magnesense® Differential Pressure Transmitter

Series MS in Flame-Proof Enclosure


The ATEX/IECEx Approved Series AT2MS 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. Flame-proof 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 keep IP66 rating (IP65 with option OPV, overpressure relief valve).
• 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 area.

Please see Series MS for non-ATEX/IECEx approved.

California Residents:  Click Here for Proposition 65 WARNING.

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


Air and non-combustible, compatible gases.
Wetted Materials:
Consult factory.
MS-X21: 0.5 in w.c. & 0.25 in w.c.: ±1%; 0.1 in w.c.: ±2%; 100 Pa & 50 Pa: ±1%; 25 Pa: ±2%. MS-X11: 5 in w.c. & 2 in w.c.: ±1%; 1 in w.c.: ±2%; 1250 Pa & 500 Pa: ±1%; 250 Pa: ±2% (@ standard conditions).
±1% FS/year.
Temperature Limits:
0 to 150°F (-18 to 66°C); (Note: Product temperature limits differ from case).
Pressure Limits:
1 psi maximum, operation; 10 psi, burst.
Power Requirements:
10 to 35 VDC (2-wire); 17 to 36 VDC or isolated 21.6 to 33 VAC (3-wire).
Output Signals:
4 to 20 mA (2-wire); 0 to 5 V, 0 to 10 V (3-wire).
Response Time:
Field adjustable 0.5 to 15 sec. time constant. Provides a 95% response time of 1.5 to 45 seconds.
Zero & Span Adjustments:
Digital push button. In safe zone only.
Loop Resistance:
Current output: 0 to 1250 ohm max.; Voltage output: min. load resistance 1 k ohm.
Current Consumption:
40 mA max. Display: 4 digit LCD.
4 digit LCD.
Electrical Wiring:
4 to 20 mA, 2-wire: European style terminal block for 16 to 26 AWG. 0 to 10 V, 3-wire: European style terminal block 16 to 22 AWG.
Mounting Orientation:
Diaphragm in vertical position.
Enclosure Rating:
4X IP66, IP65 with option OPV overpressure relief valve.
Housing Material:
Texture epoxy coat RAL7038.
Pressure Connections:
1/8" NPT female brass (SS optional). In presence of acetylene it is necessary to use SS.
Electrical Connections:
Two 1/2" FNPT. Cable gland not included.
11 lb (5 kg).
ATEX Certificate:
BVI 14ATEX0072.
Agency Approvals:
ATEX Compliant CE 1370 Ex II 2G Ex d IIC T6 Gb / II 2D Ex tb IIIC T85°C Db, -60°C=Tamb=+60°C IECEx Compliant: Ex d IIC T6 Gb / Ex tb IIIC T85°C Db


  • ATEX housing provides all the capabilities and value of the MS2 in a flame & explosion proof enclosure
  • Durable and rugged housing and high-quality components combined provides longservice life and minimized down-time
  • High impact strength and high temperature rated for applications where hazardous environments exist

Model Chart

EXAMPLE AT2MS 1 1 1 LCD A B 1 X T2 Series AT2MS-1-11-LCD-AB1XT2 Magnesense® Pressure Transmitter with ATEX/IECEx Enclosure, positive only unit, 4-20mA, high range 1, 2, 5" w.c. & 250, 500, 1250 Pa, wall mount, Liquid Crystal Display, Aluminum housing, Blind Top Cover, Standard Plug without Overpressure Relief Valve, Stainless Steel Tag
SERIES AT2MS                   Magnesense® Differential Pressure Transmitter
                Bidirectional Unit, 4-20 mA
Positive Only Unit, 4-20 mA
Bidirectional Unit, 0-10 V
Positive Only Unit, 0-10 V
Bidirectional Unit, 0-5 V
Positive Only Unit, 0-5 V
Bidirectional Unit, 0-5 V Output 0-12VDC Input
Positive Only Unit, 0-5V Output 0-12 VDC Input
              High Range 1, 2, 5" w.c. & 250, 500, 1250 Pa
Low Range 0.1, 0.25, 0.5" w.c. & 25, 50, 100 Pa
Piezo 10" w.c. & 2 kPa
Piezo 15" w.c. & 3 kPa
Piezo 25" w.c. & 5 kPa
MOUNTING       1             Wall Mount
DISPLAY          LCD           Liquid Crystal Display
HOUSING MATERIAL            A         Aluminum


      Glass Top Cover
    1/8" npt female brass pressure port
1/8" npt female stainless steel port
OVERPRESSURE PLUG                 X
  Standard without Overpressure Relief Valve
Overpressure Relief Valve material same as ports
TAG                   T2 Stainless Steel Tag




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