At NDT Electronic Services we design, manufacture, supply and install Radiography Compound/Bay/Enclosure/Cabinet Safety Systems that comply with industry standards: IRR2017, BS EN13849 & BS EN62061.

The ISIS Safety System is a radiography compound monitoring system. Its role is to inhibit/cease X-ray/Gamma radiography in the event that: The compound access doors are opened, an emergency stop is activated or a warning sign (Annunciator) has malfunctioned and display the status of the X-ray/Gamma machine connected to the system.


The ISIS Safety System features dual safety circuits and complies with: BS EN13849 with an achieved Performance Level PLe, BS EN62061 SIL3 and Ionising Radiation Regulation 2017 (IRR2017).

Its constituent parts are:

The central point and ‘brains’ of the system, all field devices connect to the Interlock Unit.

A three stage LED illuminated warning sign (Annunciator) displays the status of the X-ray/Gamma system connected to the Interlock Unit. Each Annunciator features failure detection circuitry and an automatic test function (self-check). Our standard system can accommodate up to 5 Annunciators.


A waist height “grabwire” emergency stop that runs along the inner perimeter of the compound that allows personnel to manually stop the X-ray/Gamma system from within the compound. Our standard system can accommodate up to 5 Lifeline Emergency Stops.


A stainless-steel, magnetically coded, non-contact, maintenance-free switch is fitted to the compound door(s). The door switches fail to safe in the event that the connecting cables are short or open circuit. Our standard system can accommodate up to 4 ISIS Door Switches.


The siren strobe unit operates in the event of an emergency stop being activated or the compound door is opened during an exposure/shot. Our standard system includes 1 siren strobe.

The Radiation Alarm detects radiation within the compound and signals the Interlock Unit. Our standard system includes 1 Radiation Alarm.


We also manufacture these safety products:

The 500B GAMMA-ALARM is a portable, battery powered alarm system designed for site radiography. Specifically Gamma-ray inspection areas. The alarm will indicate audibly before and visually when an exposure is in progress.


We supply NDS radiation monitors

The ND-1000S is a reliable, user friendly radiation monitor. The robust case, sturdy handle, long battery life and convenient size have proved to be a very popular combination.

Need advice on your X-ray Enclosure Safety System?

Our knowledgeable team are happy to review your existing system and give advice on your requirements. Please get in touch.