Grant Instruments FH16-D - Manual (Page 7)

Flow Heaters
Part No: 15630/Issue 3 Page March 2003 7
3.1.4 Temperature display
Digital units
The temperature display normally shows the temperature in °C of liquid being controlled. It
displays set temperature when the push to set °C knob is pressed.
Analogue units
The set temperature is indicated on the dial.
3.1.5 Set temperature knob
Digital
units
Push to set °C
Press knob to change display from liquid temperature to set temperature, and at the same time
rotate the knob to set the required operating temperature.
Analogue units
Turn the set temperature knob to required temperature.
3.1.6 Alarm lamp
The alarm lamp (red) on the front panel illuminates when the over temperature cut-out has
operated.
When the alarm lamp is illuminated, first check the liquid level and refill if necessary, press the
overtemperature cut-out button to reset the cut-out. If the alarm lamp does not go out, set
overtemperature as described in 3.3.
3.1.7 Set overtemperature knob
Set overtemperature (push to reset) control. The cut-out operating temperature is adjustable. If
the liquid temperature rises above the cut-out set temperature the heater and stirrer are switched
off. The cut-out is re-set by pressing the knob.
Digital units
The front of the knob has a hole through which adjustment can be made with a screwdriver.
Analogue units
The control knob can be adjusted with fingers.
3.2 Filling
Before filling the bath, disconnect the mains power supply.
When the system is fully loaded, fill to the correct level (see 2.2.2).
+5 to 80 °C Water, recommended temperature range.
Use a lid or polypropylene spheres above 60 °C to reduce evaporation and
heat loss when operating with an open load.