Gill Instruments Ltd
_____________________________________________________________________________________________________________
__________________________________________________________________________________________________
MaxiMet
Page 125
Issue 3
Doc. No. 1957-PS-021
May 2018
Check that the gauge is still level. It is possible for the gauge to become tilted as a result of small ground
movements, vandalism etc.
There will be times when, for one reason or another, the rain gauge will be not logging or will be
disconnected from the logger. During these times it is a good idea to check the balance arm of the bucket
for stiffness. The easiest way to do this in the field is to try and balance the bucket in its centre position. It
should be very difficult if not impossible to achieve this. If the bucket balances easily then examine the
bucket closely for any dirt or wear on the pivot pin and bucket tubes. Any wear will require the unit to be
repaired/replaced.
There are two drain slots at the base of the instrument with a gauze covering that might require periodic
cleaning. Carefully lift out the tipping bucket assembly to gain access to the drain slots for
checking/cleaning.
Carefully re-assemble the rain gauge parts. When reattaching the funnel to the base assembly check that
the internal funnel does not foul onto the tipping bucket. This can be checked by pouring in water and
checking if the bucket tips or, if the whole assembly is not fixed in position, by gently rocking the bucket
and listening for the bucket to tip.
Internal parts require no lubrication.
Notes: MaxiMet GMX531 is supplied with a Kalyx Rain Gauge.
MaxiMet GMX550/551 is supplied without a rain gauge.
The Kalyx calibration figure (0.2mm) can be seen on the label inside the rain gauge on the
underneath of the bucket and adjacent to the tip assembly.
Spare Parts for GMX531 Kalyx Rain Gauge
C ontac t G il l I ns trum en ts
Kalyx Aerodynamic Rain Gauge (Gill Part No. 1957-PK-070).
Kalyx Rain Gauge spares comprising of:
3 off nylon screws to retain the bucket to the base assembly.
2 off funnel gauze filters.
2 off funnel gauze retainer top caps.
Gauze-covered
drain holes
