Northeast Controls Inc.

Clark Reliance — Boiler Level Instrumentation

Conductivity Probes

Clark Reliance introduced conductivity probe technology to the boiler industry in 1959. Today NCI stocks and supplies the full range — traditional T, V, ZG, and FG probes plus brazed and compression-type probes — for Water Columns, Electro Eye-Hye systems, Turbine Water Induction Protection (TWIP), and Levalarms.

1-201-419-6111

Full Selection of Conductivity Probes

Clark Reliance offers traditional conductivity probes, brazed conductivity probes (retrofitable), and compression-type brazed conductivity probes. With the most extensive field experience in the industry, Clark Reliance conductivity probes are designed for Water Columns, Electro Eye-Hye systems, Turbine Water Induction Protection (TWIP) systems, and Levalarms.

Probe Repairability: System economy is enhanced by the availability of off-the-shelf Probe Repair Kits. Replaceable parts include gaskets and other components susceptible to routine wear. Repair kits are available for ZG and FG probes.

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Probe Length Numbering

Length measured from gasket surface of probe fitting body. First two digits = whole inches; third digit = additional 1/8". Example: T236 = T-Probe, 23-6/8" length.

Traditional Conductivity Probes

Model TTeflon Insulated
Max 450 psi

Traditional conductivity probe for lower-pressure boiler drum level applications. Teflon insulation provides reliable performance in standard steam plant service.

Compatible Systems

  • Water Columns
  • Electro Eye-Hye systems
  • Levalarms
Clark Reliance Model T conductivity probe

Cut-to-length available

Model VTeflon Insulated
Max 1000 psi

Mid-range conductivity probe with Teflon insulation for higher-pressure boiler applications. Suitable for demanding steam plant environments.

Compatible Systems

  • Water Columns
  • Electro Eye-Hye systems
  • Turbine Water Induction Protection (TWIP)
  • Levalarms
Clark Reliance Model V conductivity probe

Cut-to-length available

Model ZGZirconium Oxide Insulated
Max 1800 psiRepair Kit Available

High-pressure conductivity probe with zirconium oxide insulation for demanding high-pressure boiler service. Repair kits available for field serviceability.

Compatible Systems

  • High-pressure Water Columns
  • Electro Eye-Hye systems
  • Turbine Water Induction Protection (TWIP)
  • Levalarms
Clark Reliance Model ZG conductivity probe

Cut-to-length available

Model FGZirconium Oxide Insulated
Max 3000 psiRepair Kit Available

Ultra-high-pressure conductivity probe with zirconium oxide insulation for the most demanding boiler drum level applications. Repair kits available.

Compatible Systems

  • Ultra-high-pressure Water Columns
  • Electro Eye-Hye systems
  • Turbine Water Induction Protection (TWIP)
  • Levalarms
Clark Reliance Model FG conductivity probe

Cut-to-length available

Brazed Conductivity Probes (Retrofitable)

Brazed probes offer one-piece construction with high reliability for harsh applications or boilers that cycle frequently. Each probe is tested with three separate methods to ensure reliability across a wide range of boiler applications with variable water chemistry.

ZBRZ020ZB BrazedMax 1800 PSI (120 Bar)

One-piece brazed probe with 2 gaskets. Designed for pressures up to 1800 PSI (120 Bar). High reliability for harsh applications or boilers that cycle frequently. Average service life 5 years.

Compatible with: ZB1800 Series Electrolev systems (EL450 to EL1800)

Non-brazed ZG type (rated to 1800 PSI) also available for traditional applications.

Clark Reliance ZBRZ020 brazed conductivity probe
FSB TypeFSB Brazed CompressionMax 3000 PSI (200 Bar)

Compression-type brazed probe with replacement coupling nut. Designed for pressures up to 3000 PSI (200 Bar). No gaskets means low risk for leakage in especially high pressure and frequent cycling applications. Proven in many extremely harsh applications. Average service life 5 years.

Compatible with: ESB3000 Series Electrolevs or TWIP systems

Compression-type design eliminates threaded connections for maximum reliability.

Clark Reliance FSB Type brazed conductivity probe
FBRZ TypeFB BrazedMax 3000 PSI (200 Bar)

Brazed probe for Electrolevs or TWIPs rated to 3000 PSI (200 Bar). One-piece construction with high reliability for frequent cycling applications. Average service life 5 years. Each probe tested with three separate methods.

Compatible with: ESB3000 Series Electrolevs or TWIP systems. Replaces FG031RK.

Non-brazed FG type (rated to 3000 PSI) also available for traditional applications.

Clark Reliance FBRZ Type brazed conductivity probe

Probe-Compatible Clark Reliance Systems

Need a replacement probe or repair kit?

Provide your model number, pressure rating, and probe length — NCI will source the right part fast.

1-201-419-6111
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