Combustible Gases – Hazardous Area – Analog, Digital

Analog Transmitters provide 4-20 mA signal ( current sourcing ). Some of these provide 1 or 2 relays on preset or settable thresholds for local control devices.Digital Transmitters provide HART or Serial RS485 signals.These transmitters are also available in blind ( non-indicating) or with digital display.

These Transmitters use Catalytic Combustion Pellistors or Dual Beam Infra-red sensors.

Pellistor sensors respond to all combustible gases non-selectively and are suitable where mixture of gases is present.These sensors are used  in  standard ambient air conditions and should not be used in closed loop process lines/vessels. Life of such sensors is 3-5 years.

Infra-red sensors respond to specific gases only and are chosen where only specific gas is present. These can be used in all conditions and do not require ambient air. Life of these sensors can be  longer but are expensive to purchase.

Certified enclosures are tested and approved by the relevant authority whereas Compliant enclosures are exactly identical, self certified but do not have the certificate. All licensed areas must use Certified enclosures only. These enclosures are economical and can be used as enhanced protection in otherwise non-classified but hazardous areas.

All these transmitters can be used with PRISM Supermons, mG1000, third party receivers, PLC, DCS etc.