# What Causes The Pointer To Move On A Dial Type Thermometer?

One metal has low heat sensitivity, while the other metal has high heat sensitivity. The bimetal sensor is attached to the metal pointer or needle on the face of the thermometer. As the temperature rises, the metals respond differently, causing the metal strip to curl and move the pointer on the temperature scale.

## Where do you measure subcooling at?

Vapor bubbles present in the refrigerant will cause low refrigerant flow. Low refrigerant flow will cause a loss of capacity and efficiency in a cooling system. Liquid sub-cooling is normally measured at the liquid line service valve.

## How do I know if my refrigerant is superheated?

(See Table 1.) The compressor inlet temperature equals 50 degrees. The total superheat calculation is as follows: Degrees compressor in temperature (50 degrees) minus saturation temperature (23 degrees) equals total superheat (27 degrees).

## How do you calculate subcooling?

Calculate the subcooling as follows: subcooling = CT – T. For a refrigerant blend use the saturated liquid (bubble) temperature as the condensing temperature. Subcooling will not usually occur in the condenser unless liquid backs up in the condenser.

## Where do you measure superheat and subcooling?

Superheat and Subcooling are vital signs of the system in the same way the doctor uses blood pressure to assess someone's health. The request may come in a format something like this: SUPERHEAT The Vapor Line Temperature is measured on the large suction line near the condensing unit (A).

## How do you check superheat in refrigeration?

Measure the suction line temperature and suction pressure at the suction side service valve. Ensure the temperature probe is insulated from any external influences. Convert the gauge pressure to saturation temperature and subtract this temperature from the suction line temperature. This is the total superheat.

## How do you check superheat and Subcooling?

Use the dew point temperature on the pressure/temperature chart to obtain the evaporator saturation temperature for superheat, and the bubble point temperature to obtain the condenser saturation temperature to measure subcooling. Wrap your thermocouples with insulation to obtain accurate pipe temperatures.

## What is the easiest way to calculate subcooling?

Record the actual temperature of the liquid leaving the condenser with a surface temperature probe. Subtract the liquid pipe temperature (at the exit of the condenser) from the converted temperature (from the high side pressure using the pressure/temperature comparator). The difference is the amount of sub cooling.

## What measurement are needed to determine if refrigerant in a refrigeration system is saturated superheated or subcooled?

In order to check the refrigerant charge with Subcooling, measure the small liquid line pressure at the service valve port and convert the saturated pressure to temperature. Next, measure the actual temperature of the liquid line within 6” of the service valve and subtract it from the saturated temp.

## How do I test my HVAC subcooling?

If we measure the temperature on the liquid line exiting the condenser coil then we know the end temperature after the refrigerant has lowered in temperature.

## Where do you measure for subcooling?

liquid line service valve.