FP-C Flameproof Removable Core Immersion Heaters

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The FP-C range of flameproof removable single and multi-core heaters offer hazardous area heating solutions for oil and similar applications where low heat density is required. Designed for convenience, the elements can be withdrawn for inspection without system drain down. A standard heater consists of a single element (or multiple cores) fitted into a mounting flange. A robust Ex d terminal enclosure protects the electrical connections. The watts density of the element core fitted depends upon the media to be heated and the kilowatt rating required.

The FP removable core-type immersion heater range is certified for use in hazardous areas where the atmosphere is classified as a Zone 1 or 2 (IIA, IIB, IIC) gas group, or a Zone 21 or 22 (IIIA, IIIB, IIIC) dust group.



  • Mild steel or 316 stainless steel terminal enclosure with weatherproof protection to IP66 or Enclosure Type / NEMA 4 or 4X
  • Choice of built in process temperature sensors
  • Suitable for ambient temperatures from -60°C to +60°C (subject to cert parameters)
  • Mounting of the heater can be by a threaded NPT or BSP boss or an industry standard flange
  • Designed for horizontal installation (vertical mounting version available on request)
  • Can be supplied with the terminal box mounted away from the fixing boss / flange



Model FP4 FP6 FP8 FP10 FP12
Minimum Flange Size (in) 3 6 8 10 12
Minimum Flange Size (mm) 75 150 200 250 300
Max Cable Entries 1 off M25 & 1 off M20 1 off M32 & 2 off M25 2 off M25 & 1 off M40 2 off M32 & 1 off M25 3 off M32 & 1 off M20
Max No of Elements w/o Standoff 1 3 6 9 12


Certifications ATEX / IECEx as standard - other certifications available on request

ATEX / IECEx II 2 G/D Ex d IIC T1 to T6 Gb Zone 1 and 2
ATEX / IECEx Ex tb IIIC T450°C to T85°C Db Zone 21 and 22 (IP66)
CSA (CEC/NEC) Class I, Div 1, Groups A, B, C, D; T1 to T6, Enclosure Type / NEMA 4 or 4X
CSA (CEC) Ex d IIC; T1 to T6 Gb, IP66 (CAN)
CSA (NEC) Class I, Zone 1, AEx d IIC; T1 to T6 Gb, IP66 (USA)
CU TR (EAC), KGS, CNEx, CCOE (CCEs), Inmetro
Enclosure Mild steel as standard - 316 stainless steel & painted options available on request
Elements 316L stainless steel plain surface tube as standard - mild steel & extended surface available on request
Controls Heater over-temperature protection is fitted as standard (optional process temperature sensing devices can be incorporated in the form of thermostats, RTD's or thermocouples terminated within transmitters)
Mounting 3" NB 150lb ANSI RF Blind 316L stainless steel flange as standard. Any threaded NPT or BSP boss or flange in any material can be specified within the limits of the design parameters; heater terminal box can be either "direct-on" or "stand-off", depending on process temperature
Rating To suit process requirements within the design and certification parameters
Voltage Any electrical supply up to 690VAC (600V CSA) +0/-10% tolerance
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