Nuclear Pressure
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Nuclear Instrumentation

Delta Mobrey offers a comprehensive range of qualified and tested pressure,

temperature, level and flow measuring instruments for the nuclear industry

Delta Mobrey has served the nuclear industry in the UK since the first nuclear reactors were designed and built over 55 years ago.

A specialist in pressure, temperature, level and flow sensors, Delta Mobrey has provided a range of generic and bespoke instruments to the industry across all the UK Nuclear Fleet including Magnox, AGR, PWR and DFR and PFR

Delta Mobrey has also worked in the worldwide nuclear industry for over 40 years with projects in China, Sweden, Finland, South Korea, the USA, Canada, India and Spain on PWR, BWR and CANDU reactor types. Our products are used within containment, in the nuclear island, in safety shut down applications, critical areas of process control, alarm and general process monitoring

Product Qualification

Instrumentation used in Nuclear Power Plant may be required to survive seismic and radiation exposure of different severity levels depending on the location in the plant and the application. Delta Mobrey’s products meet the RCC-E and IEEE Class 1E requirements for seismic and radiation endurance. Tests details are available and are also summarised in the Instrumentation for Nuclear Applications Brochure available as a download here. Many products also meet SIL 2 requirements and numerous international Hazardous Area approvals

Bespoke products

Delta Mobrey have also developed bespoke products for our customers whenever a technical solution cannot readily be found ‘off the shelf’. Our team of Engineers is ready to discuss your exact requirements to ensure the product you need for your application is correctly specified and supplied

Click here for the Delta Mobrey Nuclear Brochure

Click here for Process Calibrators




200 Series

Pressure Switch

Qualified Harting 7D, EGS QDC and Souriau connectors available

Delta Mobrey Microswitch tested to meet requirements of RCC-E K2

Best in class accuracy of ± 0.5%

FEP and EPDM seals and gaskets suitable for exposure to radiation

Weatherproof and Flameproof models Ex d IIC - ATEX

Ranges available up to 75 Bar (1,000 psi)

Models for fixed and adjustable switching differential

Safety vented or blow out device as standard

300 Series

Differential Pressure Switch

Qualified Harting 7D, EGS QDC and Souriau connectors available

Delta Mobrey Hermetic Microswitch tested to meet requirements of RCC-E K2

Best in class accuracy of ± 1%

Weatherproof and Flameproof models Ex d IIC - ATEX

Static pressure up to 250 bar (3500 psi)

Models for fixed and adjustable switching differential

Safety vented or blow out device as standard


720 Series

Fast Response Temperature Switch

Delta Mobrey has optimised the design of this product to react very

quickly to temperature change and can provide fast early warning of

 possible problems in the plant. This model consists of a

sensing element manufactured from thin walled copper tube

filled with a volatile fluid. By keeping the length to diameter ratio high,

the surface area of the sensing element is maximised achieving a

fast er response to temperature changes than more traditional types.





700 Series

Temperature Switch

Qualified Harting 7D, EGS QDC and Souriau connectors available

Best in class accuracy of ± 0.5%

Set point ranges up to 300°C (580°F)

Rigid and semi-rigid thermal system options

FEP and EPDM seals and gaskets suitable for exposure to radiation

Weatherproof and Flameproof models Ex d IIC - ATEX

Safety vented or blow out device as standard


588 Series

Air Flow Transmitter / Switch

EMPHASIS Assessed – Smart Instrument

For  use in a variety of applications in the nuclear industry where positive measurement of air flow is critical

for plant and personnel safety.

The latest variant of the Flow Transmitter has an integrated

switch for simple alarm applications.

The Transmitter is SIL 1 level certified

Flow rates from 0.8 m/s and up to 38.5 m/s






Delta Switches undergoing radiation testing

A number of the switches were exposed to a Total Integrated Dose (TID)

of 17.82MRads at a rate of 0.25MRads/hr using Cobalt 60 gamma rays

to achieve the end-of-life condition expected after being exposed to

both normal and accident conditions.

Other switches were exposed to a TID of 27.5MRads.

LOCA/HELB Accident Simulation

Following the aging programme and the seismic tests the products

were subjected to a HELB (High Energy Line  Break) / LOCA

(Loss of Coolant Accident) simulation.

This exposed the products to 173°C superheated steam

for 3 hours at 550KPa abs, and 160°C for 6 hours and

24 hours at 120°C with saturated steam.

Seismic Qualification

In separate test programmes Delta’s products were seismically

tested using the random multi-frequency (RMF)

test requirements of Standard IEEE 344-1975/1987 and were

subjected to tri-axial RMF test levels as shown

below, and also to the spectra as defined in the RCC-E Code

Nuclear Product Qualification


Bespoke Instruments

Special engineered

Differential Pressure switch

incorporating chemical seals with

flushing ports and small deadband for use in

Nuclear Power Plant

Click here for overview

•More than 1,000,000 instruments sold world-wide

•Sales in more than 50 different Countries



Your Trusted Partner

in Process Instrumentation