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Pressure switches for aggressive liquid and gas Ex-DNS and Ex-VNS FEMA / Honeywell

Pressure switches of the Ex-DNS and Ex-VNS series produced by Honeywell / FEMA are suitable for monitoring and controlling pressures in chemical plants, process engineering and any situationwhere the...

Pressure switches of the Ex-DNS and Ex-VNS series produced by Honeywell / FEMA are suitable for monitoring and controlling pressures in chemical plants, process engineering and any situationwhere the pressure of aggressive liqui sand gases must be monitored.


Product comparison
Type Setting range
Switching differential
(Tolerance)
Maximum permissible
pressure
Ex-VNS301 -250…+100 mbar 10…60 mbar 3 bar
Ex-VNS111 -1*…+0.1 bar 10…65 mbar 6 bar
Ex-DNS025 0.04…0.25 bar 20…37 mbar 6bar
Ex-DNS06 0.1…0.6 bar 10…35 mbar 6 bar
Ex-DNS1
0.2…1.6 bar
10…40 mbar 6 bar
Ex-DNS3
0.2…2.5 bar
10…90 bar 16 bar
Ex-DNS6 0.5…6 bar 0.05…0.2 bar 16 bar
Ex-DNS10 1…10 bar 0.05…0.3 bar 16 bar
Ex-DNS16 3…16 bar 0.05…0.3 bar 25 bar
* At very high vacuums, close to the theoretical maximum of –1 bar, the switch may not be usable in view of the special conditions of vacuum engineering. However, the pressure switch itself will not be damaged at maximum vacuum.

All components of the sensor system are made of high quality stainless steel (1.4571) and welded using the latest methods without filler metals. The pressure sensor is gasket free plasma welded.
The maximum medium temperature at the pressure sensor must not exceed the permitted ambient temperature at the switching device. Higher medium temperatures are possible provided the above limit values for the switching device are ensured by suitable measures (e.g. siphon).
The Ex-DNS and Ex-VNS series by Honeywell / FEMA are calibrated for falling pressure. This means that 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.

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