Chemglass CG-15001 Series User Manual
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The Chemglass Digital Temperature Controller is equipped with an over-temperature protection circuit that turns OFF heating
whenever the temperature of the medium rises 10
C above the set point. When the medium temperature falls below 10C above
the set point, the circuit is reset and the controller begins to operate normally. A flashing “-AL-” on the Display indicates an over-
temperature condition.
If needed, use the following sequence to change the over-temperature value, which is factory set to 10
C.
1. Press and hold both the and
keys until the word “tunE” appears in the display, then release both keys.
2. Press the
key until the characters “SEt.2” appear in the display.
3. While holding in the key, press the or key until the desired valu
e, i.e. “15”, “20”, “30” appears in the display. Then
release all keys.
4. To return to normal temperature display, press and hold both the and keys until the temperature is displayed, then
release both keys.
CAUTION: PARAMETER SETTINGS IN LEVEL 3 AFFECT THE FAIL SAFE STATE
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Problem
Possible Cause
Corrective Action
Large overshoot of the set point
(>4
C)
Controller is not tuned for process
being heated.
Tune the Controller. See Autotune section, pg. 4.
Unstable temperature control
Controller is not tuned for process.
Heater is too large for process.
Tune the Controller. See Autotune section, pg. 4.
Replace Heater
– contact Chemglass‟ Technical Service
Controller comes on, but does
not heat.
Heater has malfunctioned.
To verify that the controller is functioning, enter a set point
of 100
C. Plug a light into the outlet of the controller; wait