Ex-DNS / Ex-VNS Explosion-Proof Pressure Switches and Vacuum Switches with Stainless Steel Sensors

DNS series pressure switches are suitable for monitoring and controlling pressures in chemical plants, process engineering applications, and wherever the pressure of aggressive liquids and gases must be monitored.

Ex-DNS / Ex-VNS explosion-proof pressure switches and vacuum switches with stainless steel sensors (1.4571) are suitable for monitoring and controlling pressures in chemical plants, process engineering applications, and wherever the pressure of aggressive liquids and gases must be monitored. All components of the sensor system are manufactured from high-quality stainless steel (1.4571) and welded using state-of-the-art processes without filler materials. The pressure sensor is seal-free and plasma-welded.

The robust housing is made of seawater-resistant GD Al Si 12 die-cast aluminum. The die-cast aluminum housing is chromatized and stove-enamel coated with a durable plastic finish. Corrosion tests using a 3% saline solution and 30 temperature cycles from +10 to +80 °C showed no surface changes after 20 days. The switching differential of the Ex-DNS / Ex-VNS series is not adjustable.

Features and Benefits

• The Ex-DNS and Ex-VNS series are calibrated for falling pressure.
• The adjustable switching pressure on the scale corresponds to the switching point at falling pressure.
• The reset point is higher by the amount of the switching differential.
• High-quality stainless steel components throughout the sensor system.
• Suitable for aggressive liquids and gases.

Certifications

• IBExU12ATEX1040 according to ATEX 2014/34/EU
• IECEx IBE 14.0077
• SIL2 according to IEC 61508-2

Technical Data

• Switching Differential: 0.002 bar air pressure
• Minimum Ambient Operating Temperature: -20 °C
• Maximum Ambient Operating Temperature: 60 °C
• Brand: FEMA | Honeywell
• Switch Configuration: SPDT microswitch; switching capacity 2 A inductive, 3 A resistive
• Scale Calibration: Falling pressure
• Pressure Type: Gauge pressure
• Connection Type: G 1/4″ female thread, G 1/2″ male thread