Campbell Scientific CS525 ISFET pH Probe - Manual (Page 9)

CS525 ISFET pH Probe
3. Installation and Wiring
Campbell Scientific only offered the 0 to 5000 mV output range
for CS525 probes ordered before January 2010. These probes
had four wires instead of five. Wire colors were red (signal),
black (power), white (signal reference), and clear (shield). NOTE
3.1 Preparation for Use
The CS525 is shipped dry. Before the probe can be calibrated, soak it in 7 pH
buffer solution for 15 minutes. Unlike many glass-bulb type pH sensors, the
CS525 ISFET pH probe can be installed without regard to orientation.
3.2 Wiring
The CS525 has two output range options: 0 to 5000 mV or ±400 mV. Select
the output option that best fits the measurement range of the data acquisition
device used.
Campbell Scientific’s CR800, CR850, CR1000, and CR3000 can measure
several output ranges. With these dataloggers, either the 0 to 5000 mV output
or ±400 mV output can be chosen for the CS525. Connect the CS525 to the
CR800, CR850, CR1000, and CR3000 based on the probe’s output option (see
Table 3-1).
TABLE 3-1. CR800, CR850, CR1000, and CR3000 Wiring
Datalogger Connections Wire Color Wire Label/Function
0 to 5000 mV ±400 mV
Red Power 5 Vdc 5V 5V
Black Signal Reference
White Signal SE
Green Signal SE
Clear Shield G G
The CR200(X)-series dataloggers can only measure the 0 to 2500 mV output
range. To accommodate this limitation, choose the 0 to 5000 mV output
option for the CS525, and then use a VDIV2:1 to divide the sensor’s 5 Vdc
output to 2.5 Vdc (see Table 3-2).
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