Series AT-1900 ATEX/IECEx Approved Compact Low Differential Pressure Switches
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.
Product Applications
- Hazardous area low pressure applications
- Air conditioning refrigeration coil icing detection; defrost cycle initiation
- Clogged filter detection
- Variable air volume controller
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.
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