Required tool
● Pin (<2.5 mm)
ATM
HV
Fig. 9:
Button for calibration
Preparing for calibration
1. Ensure the same installation and ambient conditions as those applicable for normal use.
2. Check the filter for contamination as required.
3. Replace the filter if the filter is contaminated or damaged.
4. Put the gauge into operation.
HV calibration
1. Evacuate the vacuum system to a pressure ≤ 10
-5
hPa.
2. Operate the gauge at this pressure for approx. 5 to 10 minutes.
3. Press the “HV” button briefly using a pin.
– The gauge calibrates to “ur” (underrange).
● TPR 270: < 1.5 V
● TPR 271: < 2.2 V
ATM calibration
1. Operate the gauge for at least 10 minutes at atmospheric pressure.
2. Press the “ATM” button briefly using a pin.
– The gauge calibrates to 1000 hPa (standard) (8.5 V DC).
Maintenance
27/40
