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MODEL 3081 pH/ORP SECTION 3.0
WIRING
SECTION 3.0
WIRING
3.1 GENERAL INFORMATION
pH and ORP sensors manufactured by Rosemount Analytical can be wired to the Model 3081 pH/ORP transmitter in three
ways:
1. directly to the transmitter,
2. to a sensor-mounted junction box and then to the transmitter,
3. to a remote junction box and then from the remote junction box to the transmitter.
The pH (or ORP) signal can also be preamplified in one of four places.
1. in the sensor,
2. in a junction box mounted on the sensor,
3. in a remote junction box.
4. at the transmitter.
Figure 3-1 illustrates the various arrangements.
3.1 General Information
3.2 Wiring Diagrams
FIGURE 3-1. Wiring and Preamplifier Configurations for pH and ORP Sensors.
The asterisk identifies the location of the preamplifier. In (a) and (b) the sensor is wired directly to the transmitter. The signal is
amplified at the sensor (a) or at the transmitter (b). In (c) the sensor is wired through a sensor-mounted junction box to the trans-
mitter. The preamplifier is in the sensor-mounted junction box. In (d) and (e) the sensor is wired through a remote junction box to
the transmitter. The preamplifier is located in the sensor (d) or the junction box (e).