Permeation Tube Oven Calibration - Thermo Scientific 146i Instruction Manual

Permeation Tube Oven
Calibration
Setting Perm Oven Temperature
Thermo Fisher Scientific
15. Go to the High Point screen, enter the exact value of the resistor and
press to calibrate the high resistance point.
16. Press to return to the Factory Cal Oven Therm menu.
17. Remove resistor from POJ3 and re-attach the permeation oven.
18. Perform a thermistor calibration using the "Permeation Tube Oven
Calibration" procedure that follows.
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.
C) and to use a permeation tube whose
°
C corresponds to an error of 1% in
°
0.2 C. Thus a 1% resistor
± °
C) can be used to set the span on the
°
Model 146i Instruction Manual
Optional Equipment
Permeation Oven
9-5