Series 830/840/860 Instruction Manual

Chapter 4 Maintenance

 

 

Sensor Electrical Test

Caution!

*Important note: Removal of the sensor cover and dis- turbance of sensor insulation blanket that is inside will alter the sensors performance,

will necessitate a re- calibation, and may break the sensor micro-weldings.

To check the electrical integrity of the sensor windings:

1.Remove the unit from the system.

2.Remove the two 4-40 Phillips head screws located on top of the electronics enclosure and slide the enclosure up and off. Use a nut driver to remove the two standoffs supporting the printed circuit boards. Tilt the boards to access the three sensor wires as shown below.

3.Locate the black, red and white wires connecting the sensor to the main circuit board.

4.Connect one lead of an Ohm meter to the white wire and meas- ure the resistance between the red and white wires. Next, measure the resistance between the black and white wires. These readings should each be approximately 50 Ohms. Low or zero Ohm readings on either indicates a short circuit. High or infinite Ohms readings indicate an open circuit.

5.Next, measure the resistance between the case (metal part of the flow body) and any one of the sensor wires. This reading should be 2 Megohms or greater. Incorrect readings require sensor replacement and re-calibration.

6.When the transducer is re-installed in the system, leak test the connection. Check transducer calibration. See instructions be- ginning on page 4-13.

Figure 4-5. Sensor Wire Access

IM-83/84/86-H

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Sierra 830, 860, 840 instruction manual Sensor Electrical Test

840, 830, 860 specifications

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