Grant Instruments T100-MST20 - Manual (Page 17)

T100-MST20 31083 V2
Operating Manual Page 16
www.grantinstruments.com
11.0 Troubleshooting
Symptom Possible cause Action required
Display shows
“Cut” Over-temperature
cut-out has operated The heating element has exceeded 110°C. Allow the
unit to cool and reset the over-temperature cut-out
by switching the unit off and on again.
If 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)
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 Low liquid level float
switch has operated
Over-temperature
cut-out has operated
Check that the liquid level in the bath is adequate .
The heating element has exceeded 110°C. Allow the
unit to cool and reset the over-temperature cut-out
by switching the unit off and on again.
If unit still shows a “Cut” alarm then the unit has an
internal fault and must be repaired before it is used
again.
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.
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.
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).