Vaisala GM70 - Manual (Page 44)

USER'S GUIDE ______________________________________________________
44 _____________________________________________________ M010139EN-G
1. Connect the end of the GMA70-cable to either of the GM70's
connector ports located on the bottom of the indicator.
2. Connect the other end of the GMA70-cable to the SERIAL COM pin
connector of the transmitter motherboard.
3. Turn on the MI70 indicator.
4. Set the GM70 probe next to the transmitter to be checked. Ensure
that the probes are located in the same conditions. Avoid exhaling
towards the probe as this alters the CO
2
concentration and disturbs
the readings.
5. The reading of the transmitter is shown on the first or middle row
of the display, depending on which connector is used. Value of
connector I is shown on the upper row of the display. Value of
connector II is on the lower row of the display. The difference of
the readings is shown on the lowest row.
6. Compare the readings. In case there is a need for an adjustment,
send the transmitter to a Vaisala Service Center to be adjusted. The
GMD/W20 transmitters can be adjusted also by using a calibration
software kit (19222GM).