Thermo Scientific 146i, Instruction Manual

Page: 265 / 340

Optional Equipment
Permeation Oven
Thermo Fisher Scientific Model 146 i Instruction Manual 9-7
3. From the Permeation Oven menu, in the Service menu, select Cal Gas
Thermistor > Water Bath . Enter the thermistor temperature from the
thermometer and press ( Figure 9-2 ).
Figure 9-2. Cal Gas Therm Bath Screen
4. Remove the thermistor from the water bath, dry, and replace into the
permeation tube oven.
5. Make sure the charcoal scrubber is connected to the ZERO bulkhead on
the rear panel.
6. Wait for the permeation gas temperature reading to stabilize.
Setting Temperature with Known
Resistance
Use the following procedure to set the gas temperature with an accurate
known resistance.
1. Remove the thermistor from POJ1 on the measurement interface board.
1. Connect a 4.369 K
Ω
resistor across pins 1 and 2 of POJ1 (use a
resistance substitution box and an accurate meter, if necessary).
2. From the Permeation Oven menu, select Cal Gas Thermistor , then
select known resistor ( Figure 9-3 ).
SAMPLE 12:34 ALARM x
CAL GAS THERM (BATH):
CURRENTLY: 45.80
o
C
SET TO: 45.0 0
o
C
§¨
MOVE CURSOR
©ª
CHANGE VALUE
ƒ
ƒ ƒ
ƒ
SAVE
RANGE AVG DIAGS ALARM