* 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.
The “zero” reference point on the scale of the unit corresponds to the relevant atmospheric pressure.
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-VCM and Ex-VNM Honeywell / FEMA series 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.
Kind of pressure
internal thread G¼, external thread G½
terminal connection M16x1,5
rugged housing of seawater resistant aluminium die casting GD Al Si 12
-15 ... 60°C
Media temperature limit
higher temperatures are possible, provided that the limit is safeguarded by suitable measures (e.g. water tube trap, see Accessories for Pressure Switches / Transmitters)
-15 ... 60°C
Ambient temperature limit
at temperatures below 0°C, ensure that no water condensation can arise in the sensor and in the switching device
SPDT Microswitch 250 VAC; capacity 2 A inductive, 3 A resistive
• SIL2 according IEC 61508-2
• IBExU12ATEX1040 according to ATEX 94/9/EC
• IECEx IBE 14.0077