Permeation Tube Oven Calibration; Setting Perm Oven Temperature; Figure 9-2. Cal Oven Therm Resistor Screen - Thermo Scientific 43i Instruction Manual

Permeation Tube
Oven Calibration
Setting Perm Oven
Temperature
Thermo Fisher Scientific
There are two general approaches that can be used to calibrate the
permeation tube oven. The first is to calibrate the temperature indicator
very accurately (to better than 0.02
weight loss has been previously determined at that temperature.
Note An error of approximately 0.1
release rate. ▲
The second approach is to note that the thermistors used to measure
temperature are interchangeable to better than
of the proper value (4.369 KΩ for 45
measurement interface board. The release rate for the permeation tube is
then determined by weight loss in the actual oven being used.
You can use either of the two calibration methods presented here. One
method involves performing the "Setting Perm Oven Temperature"
procedure and then continuing with the "Setting Temperature with Water
Bath" procedure.
Alternatively, you can perform the "Setting Perm Oven Temperature"
procedure and then continue with the "Setting Temperature with Known
Resistance" procedure.
In either case, use the following procedure for setting the perm oven
temperature.
1. Unplug POJ3 from the measurement interface board. Place a 4.369
KΩ resistor across pins 3 and 4 on the board.
2. From the Permeation Oven menu in the Service menu, select Cal
Oven Thermistor (Figure 9–2).
CAL OVEN THERM (RESISTOR):
CURRENTLY:
SET TO:
CHANGE VALUE
RANGE
Figure 9–2. Cal Oven Therm Resistor Screen
C) and to use a permeation tube whose
°
C corresponds to an error of 1% in
°
±
C) can be used to set the span on the
°
4369 Ohms
04369 Ohms
MOVE CURSOR
SAVE
AVG DIAGS ALARM
Model 43i Trace Level-Enhanced Instruction Manual
Optional Equipment
Internal Permeation Span Source
0.2 C. Thus a 1% resistor
°
9-5