Model PR 10 is a piston type differential pressure instrument (gauge + Switch) and Model PR 20 is diaphragm type instrument. Both are certified for Ex d IIC T6 IP66 from an independent, NABL approved laboratory, Karandikar Laboratories. The entire assembly is certified for use in category 2 & 3 of hazardous locations. Flame proof enclosure contains the explosion and quenches the flame.
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High and Low pressures are separated by a sensor assembly consisting of a magnet, diaphragm and a range spring. The difference in pressure causes the assembly to move in proportion to the change against the range spring. A rotary magnet, located in a separate body compartment and isolated from the acting pressures, is rotated by magnetic coupling as per the linear movement of the sensor assembly. A pointer attached to the rotary magnet indicates differential pressure on the dial.
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