IM 12B6B3-E-H
3-10 Installation and wiring
Figure 3-10. Terminal identification labels
3-7. Sensor wiring
Refer to figure 3-11, which includes drawings that outline sensor wiring.
The EXA PH402 can be used with a wide range of commercially available sensor types, both from
Yokogawa and other manufacturers. The sensor systems from Yokogawa fall into two categories; the ones
that use a fixed cable and the ones with separate cables.
To connect sensors with fixed cables, simply match the terminal numbers in the instrument with the identifi-
cation numbers in the instrument on the cable ends.
The separate sensors and cables are not numbered, but instead use a color-coding system. The electrodes
have a colored band incorporated in the label on the connection cap:
● Red for measuring electrodes (both pH and ORP)
● Yellow for reference electrodes
● Blue for combined sensors with both measuring and reference elements in the same body
● Green for temperature sensors
The recommended procedure is to color-code each end of the cables to match the sensors with the color
strips provided with each cable. This provides a quick way to identify the ends of the cables belonging to a
particular sensor when they are installed. (The procedure for fixing the identification labels is described in
detail in the instruction sheet provided with the cable.)
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