Levelstate Systems – Global Leader in Level Probes & Gauge Spares
Levelstate Systems Ltd, headquartered in Alton, Hampshire, United Kingdom is a trusted manufacturer and supplier of level measuring and switching equipment.We have spent over 30 years designing and manufacturing direct replacement conductivity probes and boiler drum gauge spares for steam generating plants across the power, petrochemical and manufacturing sectors. Our probes are built for low & low pressure, high temperature environments using Zirconium insulation, high grade stainless steel, and precision vacuum brazed assembly.
With Ex-stock availability of all our products with combined global presence, we are able to provide prompt delivery and fast service support
Boiler Drum Probes & Gauge Spares Available for all Major Brands
At Levelstate, we engineer and manufacture distinct conductivity probe configurations alongside a comprehensive selection of gauge glass spares. All our products are stocked in the UK and ready to ship anywhere in the world.
- Hydrastep (Delta Mobrey/Emerson)
- Cesare Bonetti
- Clark Reliance
- Fossil
- Yarway
- Narvik Yarway
- BHEL.
Our Products
OEM Compatibility Chart For Choosing Replacement Probe
Avoid downtime caused by OEM supply delays or product discontinuations issues. Levelstate manufactures certified, high-quality alternative probes engineered to the exact electrical and dimensional standards of major global brands. Find your right replacement probe using the table below.
| Level State Part No | Compatible OEM System | OEM Part Number(s) |
| Type 851 | Hydrastep / Solartron / Mobrey | 459600602 |
| Type 852 | Hydrastep / Solartron / Mobrey | 246781Z / 246781ZA |
| Type 862 | Fossil / Yarway | 9300-0002 / 964584-01 |
| Type 871 | Clark Reliance | ZG020 |
| Type 872 | Clark Reliance | FG031 |
| Type 882 | Hydrastep / Solartron / Mobrey / BHEL | 459600201 / Bhel-Vision |
All Levelstate probes are manufactured to deliver equivalent or superior performance to the listed OEM parts. Contact our team to confirm compatibility for your specific installation and pressure rating.
Why Plant Engineers Choose Levelstate
Certified Quality at Every Stage
Every probe is vacuum brazed, helium leak tested, and hydrostatically pressure tested for proven reliability in demanding boiler applications.
Precision Materials. Built for Pressure
Premium stainless steel and zirconium ceramic deliver exceptional thermal stability, brazing integrity, and dependable performance in high-pressure steam service.
30 Years of Expertise
Trusted worldwide, with 95,000+ probes installed, delivering proven boiler drum level measurement solutions for over three decades.
Ready Stock Available
Comprehensive UK stock ensures fast dispatch of probes and gauge glass spares, minimizing downtime and avoiding long manufacturing lead times.
Frequently Asked Questions
A conductivity probe is an electrode installed in the water column of an electronic drum level indicator to detect the presence of water or steam at specific measurement points. Water conducts electricity and steam does not, the probe signals the control system to indicate real-time drum water level. Maintaining the correct drum level prevents damage to the steam drum, boiler, and turbine.
We at Levelstate manufacture certified direct replacement probes for Hydrastep (Delta Mobrey / Emerson), Clark Reliance, Fossil / Yarway, Narvik Yarway, Cesare Bonetti, and BHEL systems. Our OEM compatibility reference table maps each Levelstate probe type to its corresponding OEM part number for straightforward identification and ordering.
No. Levelstate probes are engineered as true drop-in replacements, manufactured to the same dimensional and specifications as the OEM parts they replace. No wiring modifications, no adaptor plates and no recalibration of the control system are required. Your existing column installation remains completely unchanged.
Every probe manufactured at our Levelstate Hampshire facility undergoes a three-stage quality process: vacuum brazing for joint integrity, Helium leak testing to detect even the smallest defects and Hydrostatic pressure testing to verify performance under operating conditions. This ensures zero performance compromise in high-pressure in high-temperature steam environments.
All Levelstate probe types and gauge glass spares are held ex-stock at our Alton, Hampshire facility. Contact our team at +44 (0)1420 394001 or sales@levelstate.com for specific lead times to your location and order quantity.
The Levelstate Type 851 is the certified direct replacement for the Hydrastep 459600602 probe, also referenced under Solartron and Mobrey part numbering. It is manufactured to identical dimensional and performance specifications that requires no modification to your existing Hydrastep installation.