The HFS Ex Hazardous Area Horizontal Float Switch is a float operated magnet arm on a reed switch sensor stem which has been specifically designed for the control and indication of a liquid level whilst in a potentially explosive atmosphere. Manufactured in 316L Stainless Steel, the HFS Ex can be used in both high temperature and high pressure applications and is suitable for gas and dust hazardous environments. It reliably detects the liquid level and offers voltage free contact operation, ideally suited for use as part of a pump control system or for alarm signalling.
- ATEX and IECEx Ex d approved.
- Voltage free SPST or SPDT reed switch contacts.
- Stainless Steel 316L housing and wetted components.
- Custom mounting options available.
- Suitable for high liquid temperatures.
- Suitable for gas and dust hazardous areas.
- IP68 ingress protection.
- Suitable for low specific gravity liquids.
- M20 or ½” NPT cable entry.
Industries the HFS Ex are commonly used in (but not limited to):
- Hydraulic Oil
- Food and beverage industries
- Oil and gas industries
- Automotive industries
Ex CodingWith Mounting Adaptor:
Ex II 1/2G 2D
Ex db IIC (*) Ga/Gb
Ex tb IIIC (*) Db
-20°C ≤T amb ≤ +85°C
* Temperature class options to suit environment and process temperatures
- T5 / T100°C for process temperatures ≤ 85°C
- T4 / T135°C for process temperatures ≤ 125°C
- T3 / T200°C for process temperatures ≤ 190°C
|Approval||ATEX & IECEx Ex d|
|Sensor technology||Reed Switch operated by float on magnetic arm|
|Sensor tube and wetted materials||Stainless steel 316L|
|Connection head material||Stainless steel 316L|
|IP rating with suitable cable gland||IP68|
|Approximate weight||12.kg to 2.5kg depending on mounting option selected|
|Float Diameter : Specific gravity||ø38mm : 0.4 |
Other floats available
|Maximum liquid temperature:|
|T5/100°C hazard environment |
T4/135°C hazard environment
T3/200°C hazard environment
|-20 to +85°C |
-20 to +125°C
-20 to +190°C
|Maximum head temperature||-20 to +80°C |
When this equipment is intended to be used in a liquid with a process temperature above 85°C it is an essential requirement that the sensor head temperature is measured to determine if the ambient air cooling is sufficient to keep the head below 80°C. See installation manual for detail.
|Maximum operating pressure||150PSI / 10Bar standard |
450PSI / 31Bar optional
The HFS Ex sensor float and tube can withstand the stated pressure when sealed inside a tank. The connection head and resin seal to the sensor stem must not be pressurised. The pressure of the hazardous zone must not exceed normal atmospheric conditions (0.8 to 1.1bar).
|Thread connection-Sensor tube||½”-14 NPT|
|Thread connection-Wiring port||½”-14 NPT or M20X1.5|
|Voltage Free Contact Switch Rating|
|SPST Form A||0 to 240Vac. 1Amp. 50Watts Max|
|SPDT Form C||0 to 50Vdc. 0.25Amp. 20Watts Max|
|Certificate Download||[Download not found] |
[Download not found]
|Datasheet Download||[Download not found]|
|Installation Instructions Download||[Download not found]|