Gill Instruments Ltd
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MaxiMet
Page 127
Issue 3
Doc. No. 1957-PS-021
May 2018
8.2.7 Temperature, Humidity and Dewpoint
The internal temperature and humidity sensor is not user-maintainable. If used in areas of high pollution or
marine environments then consideration should be given to returning the unit for maintenance at Gill
instruments every 12 to 24 months to ensure proper performance (see para 8.6. for details about returning
the unit).
8.2.8 GMX531/GMX541/GMX550/GMX551 Side Connector
If there is no external rain gauge connected to the MaxiMet side connector, cover
the connector with the cap provided with the MaxiMet to prevent dirt and dust
from entering. On the GMX541 there is +12V dc across the side connector pins,
take care not to short out the pins.
8.2.9 Calibration
A calibration check can be done by any user/distributor by comparing the values measured by MaxiMet
with a reference value or in an environmental chamber. Users should understand that these checks are not
the same as the calibration checks or calibration done at Gill but they can provide users with some degree
of confidence to the validity of their measurements. If a user/distributor notices a significant difference
between the MaxiMet and their test environment/reference they should contact Gill to discuss this and
see if a calibration is required. See individual parts above for any recommended calibration periods.
8.3.
Fault-finding
Symptom
Solution
No output.
Check DC power to MaxiMet, cable and connections.
Check communications settings of the MaxiMet and host
system match, including correct COM port.
Check that the unit is in continuous mode.
Check that in-line communication devices are wired correctly.
Note: It is usual for anemometer TX + to be connected to
converter device RX +.
If appropriate use Safe Mode to attempt to obtain
communication with the MaxiMet.
Corrupted output.
Check that the communication settings of the MaxiMet and
host system match.
Try a slower baud rate.
Check cable lengths and type of cable.
Check for sources of external signal interference.
One-way communication.
Check that the wiring is in accordance with the manual.
Unexpected Temperature /Dewpoint
readings.
Check that the Temperature and Dewpoint units of measure (C,
F, K) settings are correct on power up.
Unexpected Wind readings.
Check that the Wind Sensor units of measure (m/s, knots, kph,
ft/min, mph) settings are correct on power up.
Unexpected Temperature/Dewpoint
and Humidity readings.
Temperature and Humidity Device faulty.
Unexpected Barometer Readings.
Check units of measure are set correctly and if offset HASTN or
PSTN readings have been applied.
