Equipment:
This type of complex thermal ramping requires the use of either a GR150 or a
GP200 Optima thermostat. Any of the Refrigeration units can be controlled
with the exception of R1/R1L. As this example will reduce the temperature
down to -20°C, we can use any of these units. You will also require the
Communications lead as supplied with the Refrigeration unit.
Liquid:
From the section on liquids you will see that the suitable type is 50% water
and 50% glycol.
4.2.1
Procedure:
Page13
Low temperature bath/circulator
Operating instructions
Version 4 - Jan 2010
Connect the socket end of the Communications lead to the Relay 1 connection on the
rear of the GP200 and the plug end to the communications lead connection ( ) on the
rear of the refrigeration unit.
Fill with liquid and turn on.
Press
button on front of thermostat and rotate knob until [
] is
displayed. Press
and rotate knob to display [
] and press
F
S
S.
Selectliquid
LowTempOil
Press
and rotate knob until [
] is displayed, press
. [
] icon is displayed;
rotate the knob until [
] is displayed and press select
F
S
Programs
Program Editor
[
] Rotate knob so that [
] is displayed.
Editprogram 1
1Temp
Phase 1
[
] is displayed. Now press the
button so the temperature is flashing, rotate
the knob to the required temperature of -20°C and press
to select.
1Temp
S
S
Rotate the knob so that [
] is displayed. Press
to adjust, the time will now
flash, rotate the knob to the required time (in this case 40 minutes) and press
to
select.
1Tim
e
S
S
Phase 2
Rotate the knob so that [
] is displayed, press
and [ ] will be
displayed, introducing Phase 2.
1.InsertAfter
S
2
Rotate the knob so that [
] is displayed and press
the display will flash, adjust
to -20°C then press
to accept.
2Temp
S,
S
Rotate so that [
] is displayed and press the
button, adjust to 1 hour.
2Tim
e
S
Phase 3
Rotate the knob so that [
] is displayed, press
and [ ] will be
displayed, introducing Phase 3.
2.InsertAfter
S
3
Rotate the knob so that [
] is displayed and press
to adjust. Adjust to
40°C then press
to accept.
3Temp
S
S
Rotate so that [
] is displayed and press the
button to adjust to 40
minutes.
3Tim
e
S
As this example is heating to above ambient we do not now require the refrigeration
unit to be on. Rotate the knob so that [
] is displayed, by pressing the
button
you can activate the relays. A [ ] next to the numbers [ ] or [ ] indicates whether that
particular relay will be activated throughout Phase 3. Relay 1 needs to be activated,
so press the
button until just the
[ ] is displayed.
3.Relays
*
1
2
*
S
S
1
4
