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Optional Equipment
Internal Permeation Span Source
Thermo Fisher Scientific
Model 43i Trace Level-Enhanced Instruction Manual
9-7
6.
Wait for the permeation gas temperature reading to stabilize.
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.
2.
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).
3.
From the Permeation Oven menu, select
Cal Gas Thermistor
, then
select known resistor.
CAL GAS THERM (RESISTOR):
CURRENTLY: 4369 Ohms
SET TO: 04369 Ohms
§¨
MOVE CURSOR
©ª
CHANGE VALUE
SAVE
RANGE AVG DIAGS ALARM
Figure 9–4.
Cal Gas Therm Resistor Screen
4.
Enter the exact value of the attached resistor and press
to save
the offset.
5.
Remove the resistor and reconnect the gas thermistor.
6.
Make sure the charcoal scrubber is connected to the ZERO bulkhead
on the rear panel.
7.
Wait for the permeation gas temperature reading to stabilize.
Use the following procedure to determine the permeation rate by weight
loss.
1.
Make sure the oven has been calibrated as described in the “Permeation
Tube Oven Calibration” procedure described previously.
Setting Temperature with
Known Resistance
Determining
Permeation Rate by
Weight Loss
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