Side Panel; Figure 3 Refrigeration Controls - Side Panel - Fluke 7011 User Manual

7011 Calibration Bath
User's Guide
7.2
20
When the indicator "toggles" red/green it has reached the set-point and is at-
tempting to control at that temperature.
(5) The heater power switch is used to select the appropriate heater power lev-
els for heating and controlling the bath at various temperatures.
(6) The cooling power switch controls power to the cooling compressor and
cooling fan.

Side Panel

The side panel has three features (see Figure 3): 1) the BACK PRESSURE
valve, 2) the COOLING TEMPERATURE regulating valve, and 3) the
COOLING TEMP gauge.

Figure 3 Refrigeration Controls - Side Panel

1) The BACK PRESSURE valve adjustment is used to control the amount
of cooling supplied to the system. This valve reduces the cooling capac-
ity by restricting the flow of refrigerant to the bath, allowing the adjust-
ment of the heating to cooling percentage. Under normal operation the
valve should be fully open (counter clockwise).
2) The COOLING TEMPERATURE regulating valve is used to adjust the
pressure which determines the temperauture the refrigerant evaporates.
Refer to the lable below the gauge for approximate psi vs bath tempera-
ture settings. The table from the label is reproduced below.