Flameproof Level Switches & Transmitters

Trumen's HAX flameproof enclosures cover gas groups IIA, IIB and IIC, rated Ex d T6 IIC to IS/IEC 60079-1. That means the same enclosure design suits a wide range of flammable gases, from the least reactive group IIA up to the more demanding IIC group that includes hydrogen.

Yes, selected models are suitable for dust Zones 21 and 22 as well as gas Zones 1 and 2. Confirm the specific instrument and zone combination you need, since not every point level or continuous model carries both gas and dust ratings.

The 26 GHz radar transmitter is available as Ex ia IIC T6 Ga, an intrinsically safe rating that limits circuit energy rather than containing an explosion in an enclosure. This suits installations where a lighter, intrinsically safe loop is preferred over a flameproof housing.

A point level switch, such as a vibrating fork or rotating paddle type, gives a single on/off signal at one height, useful for high or low alarms. A continuous transmitter, such as radar or hydrostatic, tracks the level across the full range of the vessel for display, trending and control.

Vibrating fork and vibrating rod switches keep working reasonably well with light coating, since the fork's resonant frequency change is what triggers the switch. For heavily sticky or bridging materials, a rotating paddle switch, which physically stalls against the material, is often more reliable.