Gill Instruments Ltd
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MaxiMet
Page 25
Issue 3
Doc. No. 1957-PS-021
May 2018
GMX531
A Kalyx tipping bucket rain gauge is supplied with the GMX531 and it is pre-wired with a 20m cable and 4-
way connector (Gill Part No. 1957-10-066) to plug into the GMX531.
MaxiMet GMX531 default tip size is set for 0.200mm/tip to match the Kalyx tipping bucket.
A protective cap is supplied on the GMX531 4 way outlet socket. This should be fitted at any time that the
external rain gauge cable is disconnected from the sensor.
GMX550/GMX551
The GMX550/GMX551 is not supplied with a rain gauge.
MaxiMet GMX550 default tip size is set for 0.000mm/tip (to be used with a Rain Yes or No indication
Sensor that provides a contact closure for Rain and an open contact for No rain).
For use with a tipping bucket contact closure type change GMX550/GMX551 tip setting using Gill MetSet to
match the tipping bucket figure (0.001 to 9.998mm).
A 4 way connector is supplied (Gill Part 020-06496):
Binder M8, Series 768, female, angled connector solder, part # 99 3378 00 04.
Will accept 24 AWG wire and has a cable outlet for 3.5mm to 5mm diameter wire.
Typical suitable cable characteristics for the above connector are:
Wire Gauge (AWG)
24
Single Lead Structure
32 x 0,1
Cable sheath
4.5mm
Conductor Resistance
79,9
Ω/Km
A 20m cable with fitted 4-way connector at one end and stripped wires at the other is available as an
optional accessory for the GMX550/GMX551 (Gill Part No. 1957-10-066).
An example of a 5m, 4-way connector and 4-way cable is as follows:
Binder Series 718, part # 77 3708 0000 50004-0500.
Connector illustration and wiring (view looking at the cable connector socket).
Note that the connector pin numbering is not in sequence.
A protective cap is supplied on the GMX550/GMX551 4 way outlet socket. This should be fitted at any time
that the external rain gauge cable is disconnected from the sensor.
1 = Brown
2-= White
4 = Black
3 = Blue