Emerson Process Management 2400S manual 9Sensor and cable short to case causes and remedies

Troubleshooting

With the DMM set to its highest range, there should be infinite resistance on each lead. If there is any resistance at all, there is a short to case or a short between pins. See Table 11-9for possible causes and solutions. If the problem is not resolved, contact Micro Motion (see Section 11.3).

Table 11-9Sensor and cable short to case causes and remedies

Cause	Possible remedy
Moisture inside the transmitter housing	• Make sure that the transmitter housing is dry and no corrosion is
	present.
Liquid or moisture inside the sensor case	• Contact Micro Motion. See Section 11.3.
Internally shorted feedthrough (sealed passage	• Contact Micro Motion. See Section 11.3.
for wiring from sensor to transmitter)
Faulty cable connecting sensor to transmitter	• Visually inspect the cable for damage. To replace cable, contact
	Micro Motion. See Section 11.3.

To return to normal operation:

1.Follow appropriate procedures to ensure that reconnecting the transmitter does not interfere with existing measurement and control loops.

2.Reach inside the transmitter housing and install the transmitter’s sensor connection onto the feedthrough:

a.Rotate the connector until it engages the pins.

b.Push down until the connector shoulder is flush with the feedthrough notch.

c.Replace the snap clip by sliding the clip tab over the connector shoulder (see instruction label).

3.Replace the transmitter in the transmitter housing, and tighten the screws.

4.Plug the user interface module onto the transmitter. There are four possible positions; select the position that is most convenient.

5.Tighten the user interface screws.

6.Replace the transmitter housing cover on the user interface module, and tighten the screws.

7.Reinsert the DeviceNet cable into the DeviceNet connector on the transmitter.

Compensation

Measurement Performance

Troubleshooting

Defaults

Configuration and Use Manual 129