LiCl-NaCl adjustment of HMT330/PTU300 - PTU300 - HMT330 - HM70

HM70 User Guide

Document code
M210297EN
Revision
G
Language
English (United States)
Product
HM70
Document type
User guide
This procedure is 1 of the alternative methods for completing the adjustment described in Calibrating and adjusting HMT330 series and PTU300 series transmitters.

This adjustment is done using relative humidity references 11.3 %RH (LiCl) and 75.5  %RH (NaCl).

If you use Vaisala Humidity Calibrator HMK15, use the adapter fitting (13.5 mm) on the measurement hole if you calibrate probes of HMT334, HMT335, HMT337, or HMT338 transmitter models.

To complete the adjustment:
  1. Remove the filter from the transmitter's probe and insert the probe into the 11.3 %RH reference humidity.
  2. Press Adjust to continue adjusting.
  3. Choose LiCl-NaCl autom. from the MI70 adjustment menu and press Select. Press OK to accept the note about references.
  4. Press Ready when the reading has stabilized in the LiCl reference (note that the stabilization may require 30 minutes or longer). You can follow the stabilization from the graphical display by pressing Graph.
  5. Remove the probe from the LiCl reference and insert the probe into the NaCl (75.5 %RH) reference.
  6. Press Ready when the reading has stabilized in the second (NaCl) reference (note that the stabilization may require 30 minutes or longer). You can follow the stabilization from the graphical display by pressing Graph.
  7. Confirm the adjustment by pressing Yes. If you press No, you return to the adjustment mode display and no changes are made.
  8. The adjustment is done. Press Back and Exit to return to the basic display.