LOCATING THE APPLIANCE SENSOR IN THE RETURN AIR
The most reliable and most accurate representation of the liquid temperature inside the appliance is
the return air temperature. The air coming from the evaporator is, in the average cooler, between
approximately -8 / -12
O
C. This air is then distributed over the load of the appliance and therefore
adopts the average temperature of the product it has been in contact with. By the time the air is
returned to the evaporator it is an accurate representation of the (average) liquid temperature inside
the cooler. It is for this reason that the EMS appliance sensor should be located in the return air.
LOCATING THE CONDENSER SENSOR
The EMS has a second temperature sensor for the discharge line, which is used to avoid the
refrigeration system overheating. The compressor manufacturer will usually quote a maximum
operating temperature measured at the top of the dome or on the discharge line 100mm away from
the compressor. It is advised to locate the sensor on the discharge line.