A great many of our instruments are used in potentially hazardous areas where there is a high risk of fire or explosion. Petrochemical works and oil/gas platforms are two obvious cases, but there are many others involving the use of hydrogen or other dangerous gases.
There are two types of use to be considered:
1 Spot-check readings where the instrument has to be within the hazardous area. The model SADP has three weeks of daily laboratory checks at Bradford, subject to stringent ISO9001:2000 (pending) quality control and traceable to NPL. Every meter is CE marked and is certified intrinsically safe to: BASEEFA 2001 Certificate No: baseefa03ATEX0065X (m II G EEx Ia IIC T6.) FM (pending).
2 Mains powered instruments where continuous operation is needed, but it is possible to locate the instrument itself in a safe area. Where a safe area is available for the location of the instrument, the sensor may be placed in the hazardous area using a zener barrier unit included in the instrument to sensor cable, providing protection to BASEEFA 2001. The system certification is: SYST baseefa03Y0070. Barrier Certification: BASO1ATEX7202 cert no: Ex01E2204.