Precision in Gas Detection protects Personnel and Assets

Gas detection is a must in many locations and for many reasons. A gas detector warns from unexpected emissions, controls workplace air quality, or even improves the manufacturing process. The major application is to ensure industrial hygiene requirements and workplace safety. Compur Monitors gas detectors help to avoid explosions or exposure of people to toxic gases and thus protect human lives and safety.

Detectors and Sensors

A gas detector consists of a sensitive element, which converts the concentration of the substance to be detected into a standardized electrical signal for instance 4 – 20 mA. Fixed systems consist of a sensor head including the sensor. The signal generated by the sensor head is lead to a process control system or an appropriate control module. Depending on the size of the plant to be monitored, a gas warning system can comprise from just a few sensor heads up to more than hundred.

Field – proven sensor technologies are electrochemical, catalytic, thermal or infrared sensors as well as photo ionization detectors – PID.

The concentration is monitored in parts per million (ppm), part per billion (ppb) or % lower explosion limit (LEL).

Legal Requirements

Safety instrumented systems (SIS) are normally required to comply with the standard EN 61508.  This standard quantifies the probability of a system failure exactly in the moment when it is needed. It defines 4 safety intergrity levels – from 1 to 4. 1 is the lowest, 4 is the highest safety intergrity.

Gas detectors are normally required to comply with SIL 2. Up to SIL 2 manufacturers are allowed to calculate the SIL level of their products themselves, but Compur Monitors has the functional safety parameters calculated by a third party in order to manifest that any parameter is calculated in 100 % accordance with the standard.

Looking just at one component of a SIS, is pointless. Only the combination of the sensor device, the signal control and the actuator is relevant for plant safety. Therefore Compur provides the functional safety parameters as a basis for the calculation of the total safety integrity, or even the performance of an ALARP scenario.

Gas detectors are often installed in hazardous areas. Therefore they have to comply with the specifications for explosion – proof design. The most – used protection concepts are intrinsic safety,

(Ex i), enhanced safety (Ex e), or flameproof (Ex d)

Gas Detection in Industrial Hygiene and Workplace Safety

Areas subject to potential gas exposure, for instance in chemical industries must be monitored for toxic or combustible gases. Toxic gases are monitored for TLV (alarm threshold value), with TLV being defined by official organizations such as NIOSH (National Institute for Occupational Safety and Health) and OSHA (Occupational Safety and Health Administration).

In every plant it is in responsibility of the operator to maintain the standards for accident – free work in any respect. Therefore he will audit the working environment for potential gas exposure. If there is a potential, appropriate personal or fixed protection devices such as breathing apparatus, encapsulation or ventilation will be installed.

Compur Precision

The name Compur stands for expertise and precision since 1898. Compur products are always state - of - the - art high precision and high quality instruments. Your safety is always in our focus. Starting with competent advice we deliver high quality products including after sales service. Whatever area you have to monitor: Tanks, pipelines, or even complex manufacturing plants and reactors, we comply with the highest standards or even exceed them!