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Hazardous Rated

Hazardous Rated
Products rated for use in hazardous locations. Includes valves, temperature transmitters, pressure switches which are explosion-proof and compact, flow products that monitor liquid, gas, and air flows, level models where some are submersible and applications vary, and a pressure transmitter which is microprocessor-based.

QUESTIONS

Question
For which pressure switch applications are gold contacts recommended?
Answer
For "dry circuit" applications where little or no current is flowing in the circuit to help burn off contact dirt and oxidation. Switches used with solid state circuits often fall in this category.
Question
Does Dwyer offer a fully UL/FM/CSA approved explosion proof pressure switch?
Answer
Yes. The 1950 and 1950G Series.
Question
Can the standard H2 pressure switch be used with water?
Answer
No. The brass or SS housing must be specified for compatibility reasons. The aluminum housing can leak into the switch.
Question
What is the key feature of both Proximity position indicators and level switches that sets these products apart from all competitors?
Answer
Magnetic coupling.
Question
Hi-Flow™ control valves call out ANSI B16.104 Class IV flow leakage. What does this mean?
Answer
ANSI B16.104 is a testing specification for control valves. This specification has actually been superseded by ANSI/FCI 70-2 Class IV. The class IV designation defines the allowable amount of leakage through the valve seat in the closed position. Class IV allows for .01 percent of the rated flow (Cv), to pass through the seat. Class IV is common for metal to metal seated valves.