18
4.7.1 High Temperature Limit (HL)
This menu item serves two functions. First, it establishes the maximum allowable set point
temperature and thus helps prevent an operator from inadvertently setting the temperature set point
above a pre-established temperature. Secondly, it serves as a high temperature alarm,
automatically activating both audio and visual alarm indicators when the measured fluid temperature
reaches the HL setting. The compressor, heater, fan, and pump will also turn off.
To change the high limit value, rotate the Select/Set Knob until the desired high limit value is
displayed on the temperature display.
HL
35.0
4.7.2 Low Temperature Limit (LL)
This menu item also serves a dual function. First, it establishes the minimum allowable set point
temperature and thus helps prevent an operator from inadvertently setting the temperature set point
below a pre-established temperature. Secondly, it serves as a low temperature alarm, automatically
activating both audio and visual alarm indicators when the measured fluid temperature drops to the
LL setting. The compressor, heater, fan, and pump will also turn off.
To change the low limit value, rotate the Select/Set Knob until the desired low limit value is displayed
on the temperature display.
LL
0.0
4.7.3 High Ambient Temperature Limit (HA)
This menu item protects the Chiller from overheating due to a high ambient temperature. Should the
ambient temperature rise above the limit value, the audio and visual alarms will activate and the
compressor, heater, fan, and pump will turn off.
To change the high ambient temperature value, rotate the Select/Set Knob until the desired high
ambient temperature limit value is displayed on the temperature readout.
NOTE: This value is always displayed/set in °C.
HA
35
4.7.4 Maximum Fluid Pressure (FP)
This is the maximum allowable fluid pressure and can be set in either PSI or kPa (the LED adjacent
to the display indicates the active unit of measure). Should the fluid pressure rise above the
maximum fluid pressure value, the audio and visual alarms will activate and the compressor, heater,
fan, and pump will turn off.
To change the fluid pressure limit value, rotate the Select/Set Knob until the desired maximum fluid
pressure value is displayed on the temperature readout.
NOTE: When FP first appears, the PSI LED will be lit. To view or change the FP value in kPa, press
the Units/Menu Button again. The FP will remain on the display and the kPa LED will light.
FP
•
PSI
80
FP
•
kPa x 100
5.5
NOTE: The Chiller also incorporates a built-in safety that automatically maintains fluid pressure
below a valve-regulated pressure value. It maintains this maximum outlet pressure by diverting the
flow of process fluid to the reservoir (i.e., begin internally recirculating the fluid). A maximum
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