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Often it is more cost effective to replace a sensing head with one which is pre-calibrated at a testing station, thus reducing disruption of the measuring system.
Prima offers such an industry standard 4-20 mA transmitter consisting of an electrochemical sensor, its associated circuitry and in a weather-proof / flame proof (DGMS/CMRI approved) housing.
Application :
THE PERSONAL AIR SAMPLER Model PAS25 consists of a mini pump driven by a D.C. motor working on a 6 volt rechargeable battery. These work continuously for up to 10 hours between charging. If required, the air sampler can be used, while charging by 220 V AC mains supply. The screw arrangement allows variation of flow rates between 0.5 and 2.5 litres/minute. A flow meter is mounted on the face of the box.
Pulsation dampers are internally fitted on the inlet and outlet gas circuit to smoothen the air flow. The pump unit is fitted into a M.S. case of compact size. The sampler unit can be kept on a flat surface for stability at the breathing zone level of the worker to take STEL(15 mins.)/ TWA-TLV (8 hour) measurements. The air sampler is supplied with battery charger in a carrying case.