Tech Note 109
Troubleshooting 500 Series Transmitters

1. • Check +24VDC Power at bottom left terminals
2. • Check to be sure Sensor is wired properly to top left terminals.
3. • OK Light will turn on after 30 seconds if sensor is OK.
4. • If OK Light stays out, check sensor bias or replace sensor
   1. • Accelerometer DC Bias should be between 4.0 to 16.0 VDC
   2. • Eddy Probe DC Gap should be between -3.0 and -18.0 VDC
5. • If sensor is good (DC bias or gap OK) replace transmitter.

1. • Check to be sure OK Light is “On” (see above)
2. • Disconnect field wires and verify 4-20 mA directly with Digital Volt Meter.
3. • If OK Light is “On” and there is no 4-20 mA output replace transmitter.

1. • Check to be sure sensor shield is landed with sensor common.
2. • Verify sensor shield is not grounded at each end.
3. • Check for ground loops in system.
4. • Verify sensor and cabling installation is in conduit and away from AC power.
5. • If radios are causing interference, be sure to use metal enclosure and conduit.