Grant Instruments TC120 Operating Manual - Manual (Page 23)

T100 & TC120 30423 V3
Operating Manual Page 22
www.grantinstruments.com
EN
11.0 Troubleshooting
Symptom Possible cause Action required
Display shows
“Cut” Over-temperature
cut-out has operated Check the set temperature is correct and that the
over-temperature cut-out temperature is set at least
5°C above the set temperature. Refer to section
5.3.1 for setting instructions.
If the over-temperature cut-out temperature is
correctly set but the unit still shows a “Cut” alarm
then the unit has an internal fault and must be
repaired before it is used again.
Temperature
does not rise
when expected Set temp is lower
than liquid temp
Set temperature is
too close to ambient Check that the bath set temperature is correct (see
section 5.2.3).
Increase the set temperature (see section 5.2.3) or fit
accessory cooling (see section 4.8).
Temp continues
to rise when not
expected Set temp is higher
than liquid temp
Check that the bath set temperature is correct (see
section 5.2.3).
Alarm light on Over-temperature
cut-out has operated
Low liquid level float
switch has operated Check the over-temperature cut-out is set
appropriately (see section 5.3.1).
Check that the liquid level in the bath is adequate
(see section 6.4 for minimum fill levels).
Set temperature
too restricted Liquid type set does
not allow required set
point Change to different liquid type (see section 5.3.5).
Display shows
“Flot” Liquid level has
dropped below
minimum level Check that the liquid level in the bath is adequate
(see section 6.4 for minimum fill levels).
Display shows
“–Al-” High temperature
warning alarm has
tripped Check that the bath set temperature is correct (see
section 5.2.3).
Check that high temperature alarm is correct (section
5.3.4).
Check that the liquid level in the bath is adequate
(see section 6.4 for minimum fill levels).
Display shows
“Er H” Incorrect calibration
value The high temperature calibration point is less than
40°C above the low calibration point – choose a
higher temperature (see section 5.2.6).
Display shows
“Er L” Incorrect calibration
value The low temperature calibration point is less than
40°C below the high calibration point – choose a
lower temperature (see section 5.2.6).
Display shows
“Er d” Incorrect calibration
value The calibration value is greater than 10°C from the
set point – check thermometer reading and set point
(see section 5.2.6).