Series AT-1900 ATEX/IECEx Approved Compact Low Differential Pressure Switches

The 1900 in Flameproof ATEX/IECEx Enclosure

Series AT-1900 ATEX/IECEx Approved Compact Low Differential Pressure Switches is our most popular switch and is now available in a flameproof package. This pressure switch combines advanced design and precision construction to make these switches able to perform many of the tasks of larger, costlier units. For air and non-combustible compatible gases, the Series AT-1900 switches have set points from 0.07 to 20 in w.c. (1.8 to 508 mm). Set point adjustment is easy with range screw located inside the switch enclosure. Series AT-1900 switches are available in aluminum enclosures and ideal for low pressure, hazardous area applications.

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.

Please see Series 1900 for non-ATEX/IECEx approved.

California Residents: Click Here for Proposition 65 WARNING.

Product Applications

Hazardous area low pressure applications
Air conditioning refrigeration coil icing detection; defrost cycle initiation
Clogged filter detection
Variable air volume controller

Ordering

Grouped product items
Model	Description	Availability*	Qty	Price

Specifications

Service:: Air and non-combustible, compatible gases.
Wetted Materials:: Consult factory.
Temperature Limits:: -30 to 180°F (-34 to 82.2°C) (Note: Product temperature limits differ from case).
Pressure Limits:: See pressure limit chart on catalog page.
Switch Type:: SPDT.
Repeatability:: ±3% FS.
Electrical Rating:: 15 A @ 120-480 VAC, 60 Hz. Resistive 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC, 60 Hz. Derate to 10 A for operation at high cycle rates.
Mounting Orientation:: Diaphragm in vertical position.
Set Point Adjustment:: Screw type on pressure switch inside the enclosure accessible by hole with plug on housing. Set point regulation must be done with instrument de-energized. Follow instructions and safety warning to open cover.
Enclosure Rating:: IP66.
Housing Material:: Aluminum.
Finishing:: Texture epoxy coat RAL7015.
Process Connections:: 1/8" NPT female brass (SS optional).
Electrical Connections:: Two 1/2" NPT female. Cable gland not included.
Weight:: 10.5 lb (4.8 kg).
ATEX Certificate:: INERIS 21ATEX0033X.
IECEx Certificate:: IECEx INE 21.0064X.
Compliance:: ATEX: 0080 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: Ex db IIC T5, T6 Gb -60°C ≤Ta ≤+50°C (T6) -60°C ≤Ta ≤+60°C (T5) Ex tb IIIC T75°C Db.

Features

Flameproof enclosure protects the device in hazardous areas
Compact size and repeatability provide a high-value switch for many industrial and OEM applications
Wide range of models from 0.07 in w.c. to 20 in w.c. can meet exacting OEM specifications for a low pressure switch
Range screw protected inside switch enclosure prevents tampering
Increased response time at low pressures with LD port configuration

Support Library

Product Literature

Manuals

1900

Catalog Pages

Series AT-1900 Catalog Page

Approvals

Drawings

Model Chart

     SERIES AT-1900 SERIES PRESSURE SWITCH     
     
     AT-101NA-1910-X-XXXX  AT-1900 PR SW W/ ATEX ENCLOSURE
  
          1ST SYMBOL (1ST X) RANGE
             00    0.07 - 0.15 IN WC
             0     0.15 - 0.55 IN WC
             1     0.40 - 1.6 IN WC
             5     1.4 - 5.5 IN WC
             10    3.0 - 11.75 IN WC
             20    4.0 - 20.0 IN WC
  
          2ND SYMBOL (2ND X) COVER
             B     BLIND
  
          3RD SYMBOL (3RD X) PRESSURE PORT/VALVE MATERIAL
             1     BRASS
             2     STAINLESS STEEL
  
          4TH SYMBOL (4TH X) PRESSURE PORT/VENTING VALVE
             VS0   STD PRESSURE PORT 1/8” FEMALE NPT/NO VENTING VALVE
             VL0   LD PRESSURE PORT 1/8” FEMALE NPT/NO VENTING VALVE

          4TH SYMBOL (4TH X) CABLE ENTRY
             12    1/2" NPT ANSI/ASME B1.20.1

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