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Temperature Controller
The microprocessor controller controls temperature using a PID (Proportional-
Integral- Derivative) algorithm. It is designed with self-diagnostic features and
easy to use operator interface.
NEXT ENTER
Use this key to accept and save changes.
YES,
This key is used to increase numerical values.
NO,
This key is used to decrease numerical values.
When the controller is powered it displays the reservoir fluid temperature.
Press the
NEXT ENTER
key to view the setpoint. The display flashes between
SP
and the actual setpoint number. If desired, use the
YES
and
NO
keys to
change the setpoint. The display flashes as soon as either key is depressed.
Once the desired setpoint is displayed, press
NEXT ENTER
.
When selecting an operating temperature, remember that the lowest achiev-
able temperature is a function of the available flow rate, the temperature of the
cooling water supply and the heat load.
The temperature control system actuates a control valve in the FACILITY
WATER line. The control valve adjusts the flow of the cooling water supply to
produce the desired operating temperature.
NOTE:
The controller does not use the new value until the
NEXT ENTER
key is
depressed and the display stops flashing. The controller will not allow you to
enter a value above the maximum or below the minimum value, or any illegal
value. If you try to enter an illegal value the display will revert to its original
value when the last digit was entered.
If the
NEXT ENTER
key is not depressed within one minute, the controller will
time out and the new value will not be accepted. The controller will revert to the
previous value.
NOTE:
Error codes are addressed in Section V, Maintenance and Service.
Summary of Contents for NESLAB System III
Page 23: ... 21 TU Pump Flow Diagram Optional ...
Page 25: ... 23 Large Volume Units ...
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