User Manual
Wiring Section 3 :
The Soil Instruments tiltmeter sensor can be read by most commercially available
dataloggers. Soil Instruments recommend the Campbell datalogger range and can supply a
fully built up datalogger with enclosure, logging program and a variety of communications
options from a simple direct link to satellite modem, please see our datalogger datasheets.
We do not recommend that tiltmeter sensors are read with a manual readout as this defeats
the object of in-place sensors, however if desired, a voltmeter can be used. (An external 12-
16VDC power supply will be needed to do this).
Whatever the datalogger or reading method, the wiring remains the same. The sensors are
supplied with a polyurethane-jacketed 4-core cable (6 for bi-axial sensors) suitable for long
term immersion in water at depths of up to 200m.
The cable has four or six conductors, a foil, braid and drain wire. The drain wire and screen
are not connected at the sensor end of the cable and thus should be connected to ground at
the datalogger end for maximum resistance to induced voltages and interference. The
sensor is a differential device and thus a + and – reading must be taken. The conductor
colour codes are as per the table below:-
WARNING: Take extreme care whilst wiring to ensure conductors are correctly
wired, especially the red power conductor and all of the output
conductors. Always wire with the power switched off.
When using Bi-axial sensors with a Campbell AM416 or AM16/32 multiplexers, please
contact Soil Instruments if assistance is needed in wiring to meet the CR10/CR1000 logger
protocols detailed in Section 4 of this manual.
If it is desired to check the functioning of the sensors immediately after installation, at zero
degrees tilt (i.e. true vertical), the sensor output is approximately 0VDC.
When wiring into a datalogger it is good practice to wire the first sensor (or lowest serial
number) to the first channel, the second sensor to the second channel etc. If a program not
supplied by Soil Instruments is being used the following protocol should be observed to
obtain the best results.
Power sensors on, wait for 3 seconds, take a minimum of 50 readings (differential voltage)
at minimum 100 millisecond intervals and average.
(8 pages)
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