
M67, M67S Manual
The best cooling and purging system will only be effective if it operates all the time the process is running. It is therefore good
practice to include some safeguards. The best protection for cooling and purging systems is a flow switch. This is more
effective than a pressure switch and faster than a thermostat in the case of cooling protection. Additional protection can be
derived from the provision of a rotameter flow meter and regulator. Any audible or visual alarms should be located where
personnel are routinely present so that remedial action can be taken in a timely fashion.
TABLE FOR DEGREES F
COOLING WATER (JACKET) TEMPERATURE
TABLE FOR DEGREES C
COOLING WATER (JACKET) TEMPERATURE
Table 1 - COOLING WATER TEMPERATURE AT WHICH CONDENSATION WILL OCCUR AS A FUNCTION ON AIR
TEMPERATURE AND RELATIVE HUMIDITY IN %
NOTE 1: If your cooling water temperature is below the temperatures in the above tables, condensation will form on the IR
thermometer.
NOTE 2: NR = Not recommended. Water temperature too high for IRT ambient compensation circuits to be accurate.
EXAMPLE: The air temperature is 100°F and relative humidity is 90%. Cooling water temperature is tap water and is running
at70°F. Will condensation form on the IRT?
STEP 1: Look up 100°F on the air temperature column at left.
STEP 2: Look up 90% RH on the top horizontal row.
STEP 3: At the intersection of 100°F and 90% RH see 97°F.
STEP 4: Since 70°F tap water is less than 97°F (dew point), condensation is guaranteed to form on the IRT.
STEP 5: Cooling water must be raised to above 97°F, or flow rate reduced or turned off to eliminate condensation under these
conditions.
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