Emerson Process Management 3081 pH/ORP Wiring Diagrams for Model 385+ Sensors Junction Box

MODEL 3081 pH/ORP					SECTION 3.0
					WIRING
Table 3-7 Wiring Diagrams for Model 385+ Sensors
Sensor	Junction Box	Preamplifier	RTD	Wire Functions	Wiring Diagram
385+ -02	sensor-mounted	in sensor-mounted junction box	Pt 100	Figure 3-15	Figure 3-16
385+ -03	none	in sensor	Pt 100	Figure 3-13	Figure 3-14
385+ -03	remote	in sensor	Pt 100	Figure 3-13	Figure 3-14
385+ -04	none	in transmitter	Pt 100	Figure 3-10	Figure 3-11
385+ -04	remote	in remote junction box	Pt 100	Figure 3-10	Figure 3-12

Table 3-8 Wiring Diagrams for Model 381+ Sensors

Sensor	Junction Box	Preamplifier	RTD	Wire Functions	Wiring Diagram
381+ -40-55	none	in sensor	Pt 100	Figure 3-13	Figure 3-14
381+ -43-55	none	in sensor	Pt 100	Figure 3-13	Figure 3-14
381+ -40-55	remote	in sensor	Pt 100	Figure 3-13	Figure 3-14
381+ -43-55	remote	in sensor	Pt 100	Figure 3-13	Figure 3-14
381+ -41-52	none	in transmitter	Pt 100	Figure 3-10	Figure 3-11
381+ -41-52	remote	in remote junction box	Pt 100	Figure 3-10	Figure 3-12

Table 3-9 Wiring Diagrams for Model 381pHE and 381pH Sensors

Sensor	Junction Box	Preamplifier	RTD	Wire Functions	Wiring Diagram
381pH-30-41-52*	none	in transmitter	3K Balco**	Figure 3-2	Figure 3-4
381pH-30-41-52*	remote	in remote junction box	3K Balco**	Figure 3-2	Figure 3-5
381pH-30-42-52	none	in transmitter	3K Balco**	Figure 3-3	Figure 3-4
381pH-30-42-52	remote	in remote junction box	3K Balco**	Figure 3-3	Figure 3-5
381pHE-31-41-52*	none	in transmitter	Pt 100	Figure 3-2	Figure 3-4
381pHE-31-41-52*	remote	in remote junction box	Pt 100	Figure 3-2	Figure 3-5
381pHE-31-42-52	none	in transmitter	Pt 100	Figure 3-3	Figure 3-4
381pHE-31-42-52	remote	in remote junction box	Pt 100	Figure 3-3	Figure 3-5

Table 3-10 Wiring Diagrams for Model 328A Sensor

Sensor	Junction Box	Preamplifier	RTD	Wire Functions		Wiring Diagram
328A	none	in transmitter	none	Figure 3-17		Figure 3-18
Table 3-11 Wiring Diagrams for Model 320HP Sensor
Sensor	Junction Box	Preamplifier			RTD	Wiring Diagram
320HP-10-55	on mounting plate	in transmitter			Pt 100	Figure 3-19
320HP-10-58	on mounting plate	in junction box attached to mounting plate			Pt 100	Figure 3-20

*Sensors have a BNC connector that the Model 3081 pH/ORP transmitter does not accept. Cut off the BNC and terminate the coaxi- al cable as shown in Figure 3-23. Alternatively, use a BNC adapter (PN 9120531).

**Set the RTD jumper to the 3K position (see Section 2.2). Also, program the transmitter to recognize the 3K RTD (see Section 8.5 for pH or 10.5 for ORP).

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