Gill GMX100 User Manual page 31

Gill Instruments Ltd
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4. For temporary mounting on hard surfaces use some bricks or heavy weights on the corners of the
baseplate (the height of the weights should be kept as low as possible to cause the minimum
interference with the aerodynamics of the rain gauge).
5. Refit the tipping bucket base assembly using the 3 hex nuts and washers.
Leveling the Base Assembly
Upon completion of the above loosen the 3 leveling hex bolt nuts and adjust the hex bolts align the spirit
level bubble to within the centre circle.
Now tighten the hex bolt nuts to lock the hex bolts in position and ensuring that the spirit level bubble
remains within the centre circle.
Notes: Ensure that the foam insert under the tipping bucket is removed before re-fitting the funnel.
No two rain gauge designs are ever likely to produce identical results, and identical rain gauges can give
slightly different catches, even when sited close to each other.
On GMX531 (or GMX550/551) units plug the 20m, 4-way connector cable into the MaxiMet socket.
Internal Integrated Solid State Rain Sensor (GMX100, GMX240, GMX400, and
GMX600)
The solid state rain sensor should ideally be mounted horizontally and vertically as level as possible for
optimal readings. MaxiMet has a tilt sensor output that can assist with this.
A clear view of the sky is best for optimal rain measurements. Adjacent mounting obstructions or tall
landscape features could impede rain readings.
NOTE: The Optical Sensor provides a General Indication only of rainfall levels for use in situations where
low maintenance is required. Use a tipping bucket or equivalent with a MaxiMet (e.g. GMX531, GMX550-
and GMX551) where reference quality precipitation measurements are required.
External Solid State Rain Sensor (GMX541)
The external solid state rain sensor should ideally be mounted horizontally and vertically as level as
possible for optimal readings. MaxiMet has a tilt sensor output that can assist with this.
A clear view of the sky is best for optimal rain measurements. Adjacent mounting obstructions or tall
landscape features could impede rain readings.
Three M5 x 10mm button head screws and three M6 crinkle washers are supplied with the GMX541 system
for mounting the Rain sensor to suitable tapped support pole, e.g. see Para 4.1.2 part 1405-30-056.
A protective cap is supplied on the GMX541 4 way outlet socket. This should be fitted at any time that the
external rain gauge cable is disconnected from the sensor.
The GMX541 sensor has a +12v dc output present on the 4 way connector to supply power to the external
Rain gauge and care should be taken not to short out connector pins.
NOTE: The Optical Sensor provides a General Indication only of rainfall levels for use in situations where
low maintenance is required. Use a tipping bucket or equivalent with a MaxiMet (e.g. GMX531, GMX550-
and GMX551) where reference quality precipitation measurements are required.
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MaxiMet
Doc. No. 1957-PS-021
Page 31 Issue 3
May 2018