Campbell Scientific Sentek TriSCAN® Manual v 1.2a - Manual (Page 21)

TriSCAN Manual Version 1.2a
Copyright © 1991 – 2004 Sentek Pty Ltd All rights reserved Page 14
3. Repeat this process for each sensor on the probe.
The expected air and water counts are dependent on the sensor type and sampling mode. Normalization
values outside the expected range may indicate errors in the normalization steps or problems with the
hardware.
Table 2. Expected air and water counts for different sensors
Sensor Type Sampling Mode Air Range Water Range
EnviroSCAN sensor (white) Moisture 36000±3000 23000±3000
TriSCAN sensor (blue) Moisture 33000±2000 22800±2000
Salinity 20500±2000 13500±2000
EasyAG sensor (white) Moisture 44000±2000 31000±2000
Moisture (sensor at bottom) 50000±2000 32000±2000
EasyAG with TriSCAN sensor (blue) Moisture 33000±2000 25000±2000
Salinity 20500±2000 15000±2000
Step 6 – Changing the Calibration Coefficients
To change the calibration coefficients of the sensors:
1. Click on the sensor coefficients cell when it is selected and it will go into edit mode as shown above.
2. Type the new coefficients separated by semicolons. To accept the new coefficients click outside the
cell or press Enter. If you want to discard the changes while in edit mode then press Escape. The
new coefficients will not be set in the probe’s configuration until you use the Write to Probe button.
The default calibration equation coefficients provided for different sensor types are listed in Table 3.
Table 3. Default Calibration Coefficients
Sensor Type A B C
Moisture sensors 0.1957 0.404 0.02852
TriSCAN sensors 1.0 1.0 0
Step 7 – Addressing the Probe
Where there are multiple probes connected to a logger in a multi-drop situation, it is necessary to assign
each probe a unique address to avoid a clash in communication.