Grant Instruments Transportable Incubator - Manual (Page 6)

Part number 18260 6 13/04/2006
4.8 Start up
At start up the instrument performs a lamp test for a few seconds where the display and the
leds blink, in order to verify the integrity and correct operation.
LED
Position Associated function Status
out Relay 1 ON for heater activation
ºC Setpoint ON When setting the set point
4.9 Overtemperature
To protect both the unit and your samples, the unit has a cycling thermal switch located inside
the unit and operates at 50
°C. The switch resets when the temperature falls to the reset level
(nominally 15 °C below the operating temperature) .
5 Fault diagnosis
Symptom Possible
cause Action required
Unit does not operate Unit not switched on Switch on
Unit not plugged into power
supply Plug in, switch on
Power supply failure Check that other electrical
appliances on the same
circuit are working
Fuse blown in unit or in plug
(UK units only) Check and replace - see 7.2
Overtemperature thermal
switch has operated
Thermal switch operates at
50
°C and resets when the
temperature falls to the reset
level (nominally 15
°C below
the operating temp) .
If the thermal switch keeps
operating, have the unit
checked by a competent
person.
Temperature does not rise
when expected Set temperature is lower than
block temperature Check set temperature
Set temperature is too close
to ambient Raise set temperature
Temperature control circuit
fault Have unit checked by
competent person
Temperature continues to
rise when not expected Set temperature is higher
than block temperature Check setting
Temperature control circuit
fault Have unit checked by
competent person