Vaisala GM70 - Manual (Page 46)

USER'S GUIDE ______________________________________________________
46 _____________________________________________________ M010139EN-G
Field Checking of the GMT220 or GMM220
(Without a Display)
Follow the instructions below to check the operation of a GMP220 series
probe.
1. Check the display reading of the GM70.
2. Turn off the GM70.
3. Detach the GM70's probe as follows:
- Loosen the plastic probe fastener (item 7, Figure 1) by
unscrewing it about 5 turns.
- Take a firm hold from the base of the probe and pull strongly
until the probe comes loose.
4. Detach the GMP220 probe from the transmitter base (open the
cover, loosen the tightening screw and pull the probe out) or the
module mother board.
5. Insert the GMP220 probe to the GMH70 handle as deep as
possible. Turn the probe inside the handle until you feel that a step
in the probe connector snaps into the groove of the probe handle
connector and locks the probe.
6. Tighten the probe fastener.
7. Turn on the GM70.
8. Compare the readings of the GM70 and the transmitter probe to be
checked.
9. If there is need for an adjustment, please contact Vaisala Service
Center or adjust the probe according to the instructions in Chapter
10 Calibrating and Adjusting the Probes on page 47.
You can also connect the GMA70 cable between the GMT220/GMM220
and the GM70 as described in the previous section.