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PHOTOHELIC® Pressure ControlPHOTOHELIC® models combine the MAGNEHELIC®gauge with a precise pressure switch that lets you control low and high gas pressures. Knob controls adjust dual set points, which allow for variable deadband control. These set points contain photocells that actuate DPDT relays when room pressures reach a preset upper or lower limit, and they can be set up to control corrective damper action. As the room pressure changes in response to damper motion, and the indicator returns to the null band, damper motion is halted.
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Q: Difference between photohelic and magnahelic guage?
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What do you mean by calibration of a pressure gauge?

I used to do this for a living. The pressure guage is mounted on a testing machine (usually but not always a machine called a dead-weight tester) and the readings given by the pressure guage when known pressures are applied is noted. For example, a pressure of 300 pounds per square inch is applied and the guage reads 295 pounds per square inch when the pressure is rising, but might read 305 pounds per square inch when the pressure is falling. This difference in guage reading when pressure is rising to when pressure is falling is called hysteresis. A calibration certificate for the guage is issued showing the guage readings obtained at known pressures when pressure is rising and falling. In some cases, the guage readings may be very inaccurate and if the guage has some sort of adjustment mechanism, this may be adjusted to obtain more accurate readings.


What does the thermometer mean?

It is a temperature guage.


What is gauge theory?

A guage theory is a theory about gayges.


What is gauze pressure?

If you mean "guage pressure," it is the pressure of a fluid minus the atmospheric pressure.


What are fridge compressors made of?

If I understand the question correctly, the answer may be like this. a refrigerator compressor is made up of two shells-- the upper one and the lower one. they are welded together. they are called as hermetically sealed comprssors meaning the seal is airtight. Internally, they may operate on reciprocating or rotary principle. internaly, there is a oilcooled elecric motor. on the shaft of the motor we find the crank, connecting rod and piston for reciprocating type of compressors and for rotary type, it is replaced by eccentric blade/s. the winding wire guage of the electric motor may be called as hermetic guage wires different than the regular electric wire guage.

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whats better 16 guage or 20 guage


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What do you mean by calibration of a pressure gauge?

I used to do this for a living. The pressure guage is mounted on a testing machine (usually but not always a machine called a dead-weight tester) and the readings given by the pressure guage when known pressures are applied is noted. For example, a pressure of 300 pounds per square inch is applied and the guage reads 295 pounds per square inch when the pressure is rising, but might read 305 pounds per square inch when the pressure is falling. This difference in guage reading when pressure is rising to when pressure is falling is called hysteresis. A calibration certificate for the guage is issued showing the guage readings obtained at known pressures when pressure is rising and falling. In some cases, the guage readings may be very inaccurate and if the guage has some sort of adjustment mechanism, this may be adjusted to obtain more accurate readings.


What is thicker 13 guage steel or 12 guage steel?

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16 gauge is thicker. Remember...the lower the guage the thicker the metal.