Differential pressure switch 908 adjustable

Product Details:

Grade Industrial
Seal Material Nitrile rubber or EPDM
Thread 1/4 BSP (F)
Outer Size Approx. 110mm x 70mm x 95mm
Sensor Type Diaphragm type
Display Without display
Material Aluminum enclosure, SS304 wetted parts
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Differential pressure switch 908 adjustable Product Specifications

Scale Range Adjustable 8-140 mbar (or as per model variant)
Accessories Mounting screws, instruction manual
Diameter Approx. 70 mm body
Measure Pressure Of Air, Non-corrosive gases
Grade Industrial
Processing Type Pressure die-cast body
Mount Type Panel or Surface mount
Finishing Powder coated/Anodized
Seal Material Nitrile rubber or EPDM
Display Without display
Outer Size Approx. 110mm x 70mm x 95mm
Accuracy 2% of F.S.
Sensor Type Diaphragm type
Thread 1/4 BSP (F)
Material Aluminum enclosure, SS304 wetted parts

Switching Element Single pole double throw (SPDT)
Ambient Temperature Range -20°C to +85°C
Media Temperature Range -10°C to +60°C
Pressure Connection Two connections for high and low pressure
Ingress Protection IP65 rated
Contact Type Micro switch, snap action
Weight Approx. 0.6 kg
Electrical Rating 10A, 250V AC (SPDT switch)
Set Point Adjustment External screw adjustment
Repeatability 1% of set point

Product Description

Application :

Differential pressure monitoring in e.g. hot water circuit

Technical Data :

Setting ranges:

Type Factory-set switching points between Maximum operating pressure

908.32 40 and 200 mbar 10 bar

908.34 150 and 1000 mbar 10 bar

Temperature range:
Ambient temperature from -10 to +80°C
Temperatrure of media from -10 to +80°C
Storage temperature from -40 to +80°C

Diaphragm material:
EPDM / NBR / Viton / Silikon

Pressure connection:
Inner thread G 1/8 of brass

Electrical rating:
Standard version:
max. 6 (1,5) A / 250 VAC
max. 10 (2,0) A / 250 VAC
Low power version:
max. 100 mA / 24 VAC
max. 30 mA / 24 VDC

Electrical connection:
flat plug 6.3 x 0.8 mm according to DIN 46244

Protection class:
IP54 / IP65 depending on the used protection cap. IP00 without protection cap.

Accurate and Reliable Pressure Monitoring

The Differential Pressure Switch 908 is purpose-built for precise pressure detection in air and non-corrosive gases. Its diaphragm sensor design delivers repeatable results, with 1% repeatability and 2% F.S. accuracy, making it a reliable choice for industrial environments that demand consistency and safety.

Versatile Installation and Adjustment

Featuring an external screw for set-point adjustment, this switch provides easy calibration without removing or opening the unit. Designed for both panel and surface mount installation, it adapts seamlessly to varied system setups, while included accessories ensure straightforward mounting.

FAQ's of Differential pressure switch 908 adjustable:

Q: How do I adjust the set point on the Differential Pressure Switch 908?

A: You can adjust the set point externally using the dedicated screw adjustment provided on the device. This allows for precise setting of the pressure range without needing to open the switch enclosure.

Q: What media can this differential pressure switch measure?

A: The 908 differential pressure switch is designed to measure the pressure of air and non-corrosive gases only. It is not suitable for corrosive media or liquids.

Q: When is this switch typically used in industrial applications?

A: It is commonly employed in HVAC systems, air filters, and duct monitoring, protecting equipment and ensuring operational safety when monitoring pressure differentials is crucial.

Q: Where can the switch be mounted?

A: This switch supports both panel and surface mounting, providing flexibility for integration into control panels or on-site installations as required by your application.

Q: What are the advantages of the IP65-rated enclosure?

A: The IP65 rating protects internal components against dust and water ingress, ensuring long-term reliability even in harsh industrial environments.

Q: How does the SPDT micro switch benefit my system?

A: The SPDT (single pole double throw) micro switch delivers reliable snap action, supporting both normally open and normally closed circuits for flexible system integration and dependable operational feedback.

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Type	Factory-set switching points between	Maximum operating pressure
908.32	40 and 200 mbar	10 bar
908.34	150 and 1000 mbar	10 bar