Dwyer HM35 - Manual (Page 20)

3.8 Battery replacement
• Open the battery compartment and insert 3 x 1,5 V Mignon cell AA, IEC LR6.
Always replace all three batteries at the same time!
Ensure correct polarity!
Dispose of used batteries in accordance with environmental
regulations
!
3.9 Calibration
Re-calibration may only be carried out by specialist staff and with the corresponding
pressure standards.
We recommend that you have the HM35 re-calibrated at least once a year, and, in case
of highest demands for precision, several times a year.
Manual re-calibration
• In
the
Menu,
select the Calibration → Manual Calibration function.
Zero point
(Offset)
1
. Open the pressure connection or, with the absolute pressure unit, set the given
pressure value to the normal pressure.
2.
Press the
Function
key ( )
Î the zero point will be re-calibrated.
Full-scale value
1
. Set the given pressure value to the normal pressure.
2
. Press the
Function
key ( )
Î the full-scale value will be calibrated and the HM35 returns to normal operation.
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