Test Terminals; Removing The Digital Level Controller From The Sensor - Fisher FIELDVUE DLC3010 Instruction Manual

Maintenance & Troubleshooting
October 2014

Test Terminals

Test connections inside the terminal box can be used to measure loop current. These terminals are across an internal 1
ohm resistor that is in series with the loop.
1. Remove the terminal box cap.
2. Adjust the test meter to measure a range of 0.001 to 0.1 volts.
3. Connect the positive lead of the test meter to the + connection and the negative lead to the T connection inside the
terminal box.
4. Measure Loop current as:
Voltage (on test meter)  1000 = milliamps
example:
Test meter Voltage X 1000 = Loop Milliamps
0.004 X1000 = 4.0 milliamperes
0.020 X 1000 = 20.0 milliamperes
5. Remove test leads and replace the terminal box cover.

Removing the Digital Level Controller from the Sensor

Because of its modular design, most of the service and maintenance to the digital level controller can be done without
removing it from the sensor. However, if necessary to replace sensor to instrument mating parts or parts in the
transducer housing, or to perform bench maintenance, perform the following procedures to remove the digital level
controller from the sensor.
WARNING
On an explosion‐proof instrument, remove the electrical power before removing the instrument covers in a hazardous
area. Personal injury or property damage may result from fire and explosion if power is applied to the instrument with the
covers removed.
Tools Required
Table 6‐2 lists the tools required for maintaining the DLC3010 digital level controller.
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Instruction Manual
D102748X012