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3.2.2 Choice of insertion tube
Caution…
To get the best results out of your calibrator, the insertion
tube dimensions, tolerance and material are critical. We
highly advise using the JOFRA insertion tubes, as they
guarantee trouble free operation. Use of other insertion
tubes may reduce performance of the calibrator and cause
the insertion tube to get stuck.
Caution…
Before using new insertion tubes for calibration in the RTC-
250/700 instruments, the insertion tubes must be heated up
to maximum temperature 250°C (482°F) / 700°C (1292°F) -
for a period of minimum 30 minutes.
Insertion tubes are selected on the basis of the diameter of the sensor
to be calibrated.
Use the table for insertion tubes in chapter 9.0 to find the correct part
number.
Alternatively, you may order an undrilled insertion tube and drill the
required hole yourself. The finished dimensions should be as follows:
Sensor diameter +0.2mm
+0.05/-0
DLC hole : Ø3.1mm
+0.05/-0 (RTC-156/157/158/159/250 A/B/C)
Ø4.2mm
+0.05/-0 (RTC-700 A/B/C)
Reference sensor holes : Ø4.2mm
+0.05/-0 and Ø6.55mm +0.05/-0
For RTC-156/157/158/159 A/B/C only:
In order to get optimum results and prevent ice from building up in the
well of the cooling calibrators, a proper sized insulation plug must
be placed over the well during the calibration process.
The holes in the plug must have a tight fit and unused holes must be
covered using e.g. silicone plugs (spare part no. 126280).
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