Emerson 1066 Liquid Analysis Fieldbus pH/ORP Transmitter Overview

Sensor Wiring

Overview

Connect the correct sensor leads to the main board according to the lead locations labeled directly on the main board.

Rosemount Analytical SMART pH sensors can be connected to the 1066 using either the integrated cable SMART sensor or a compatible VP8 pH cable.

After completing the wiring of the sensor leads, carefully route the excess sensor cable through the cable gland.

Separate the sensor and output signal wiring from the loop power wiring. Do not place the sensor and power wires in the same conduit or near a cable bridge.

Sensor Wiring Details

Sensor wiring should be done in the order shown above.

The terminals are listed below:

TB3 RTD INPUT TERMINALS: The leads of the 3-wire RTD should be wired as shown.

If a 2-wire RTD is used, the RTD return and RTD sense terminals must be jumpered to avoid an open RTD sense wire warning.

TB2 Reference Electrode and Solution Ground: The reference electrode lead and its shield

and the solution ground lead should be grounded as shown. If the sensor does not have a solution ground, there are two options:

1. The reference voltage input and solution ground can be jumpered.

If this is done, the reference impedance will read a constant value of 0 kilohms.

2. The second method is to turn on the solution ground terminal and set the Reference

Impedance parameter (Reference Z) in the program menu (see Section 7.3.7) to High, 

thus turning off the reference impedance measurement.

If the solution ground terminal is left open without doing so, a high reference impedance fault alarm will continue to sound.

TB4 Preamplifier Power: The power wire from the pH sensor or preamplifier in the junction box is connected to this terminal to supply power to the preamplifier.

TB1 pH Electrode Input: The pH electrode lead and its shield are located on this terminal as shown.

Smart pH Sensor: The smart pH sensor has a ground wire (not to be confused with the solution ground wire)

that should be connected to the enclosure ground as shown in the power wiring diagram