Emerson Process Management 3081 pH/ORP instruction manual Wiring Diagrams for pH and ORP Sensors

MODEL 3081 pH/ORP	SECTION 3.0
	WIRING

3.2 WIRING DIAGRAMS FOR pH and ORP SENSORS

Refer to Tables 3-1 through 3-12 to locate the appropriate wire function and wiring diagram. There is a separate table for each model. The sensor models having the highest number appear first. If you do not know the model number of the sensor, refer to the flow charts on pages 28 through 30. Only the model option numbers needed to select the cor- rect wiring diagram are shown. Other numbers are not shown. For all other sensors, see sensor manual.

Table 3-1. Wiring Diagrams for Model 399 sensors

Sensor	Junction Box	Preamplifier	RTD	Wire Function	Wiring Diagram
399-02	none	in transmitter	3K Balco**	Figure 3-2	Figure 3-4
399-02	remote	in remote junction box	3K Balco**	Figure 3-2	Figure 3-5
399-09*	none	in transmitter	Pt 100	Figure 3-2	Figure 3-4
399-09*	remote	in remote junction box	Pt 100	Figure 3-2	Figure 3-5
399-09-62	none	in transmitter	Pt 100	Figure 3-3	Figure 3-4
399-09-62	remote	in remote junction box	Pt 100	Figure 3-3	Figure 3-5
399-33 (ORP only)	none	in transmitter	Pt 100	Figure 3-21	Figure 3-22

Table 3-2 Wiring Diagrams for Model 397 Sensors

Sensor		Junction Box	Preamplifier		RTD		Wire Function		Wiring Diagram
397-50		none	in transmitter	3K Balco**				Figure 3-6	Figure 3-8
397-50		remote	in remote junction box	3K Balco**				Figure 3-6	Figure 3-9
397-54*		none	in transmitter	Pt 100				Figure 3-6	Figure 3-8
397-54*		remote	in remote junction box	Pt 100				Figure 3-6	Figure 3-9
397-54-62		none	in transmitter	Pt 100				Figure 3-7	Figure 3-8
397-54-62		remote	in remote junction box	Pt 100				Figure 3-7	Figure 3-9
Table 3-3 Wiring Diagrams for Model 396R Sensors
Sensor		Junction Box	Preamplifier			RTD		Wire Function	Wiring Diagram
396R-50		remote	in remote junction box			3K Balco**		Figure 3-10	Figure 3-12
396R-50		none	in transmitter			3K Balco**		Figure 3-10	Figure 3-11
396R-50-60	sensor-mounted		in sensor-mounted junction box			3K Balco**		Figure 3-6	Figure 3-9
396R-54		none	in transmitter			Pt 100		Figure 3-10	Figure 3-11
396R-54		remote	in remote junction box			Pt 100		Figure 3-10	Figure 3-12
396R-54-60	sensor-mounted		in sensor-mounted junction box			Pt 100		Figure 3-7	Figure 3-9
396R-54-61		sensor-mounted	in sensor-mounted junction box			Pt 100		Figure 3-10	Figure 3-12

*Sensors have a BNC connector that the Model 3081 pH/ORP transmitter does not accept. Cut off the BNC and terminate the coaxial 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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