High Temperature Applications; Lcd Meter Assembly - Fisher FIELDVUE DLC3010 Instruction Manual

Maintenance & Troubleshooting
October 2014
7. When re‐installing the digital level controller, follow the appropriate procedure outlined in the Installation section.
Also setup the digital level controller as described in the Initial Setup section.
249 Sensor in High Temperature Applications
1. Loosen the set screw (key 31) in the terminal box cover assembly (key 6) so that the cover can be unscrewed from
the terminal box.
2. After removing the cover (key 6), note the location of field wiring connections and disconnect the field wiring from
the wiring terminals.
3. As shown in figure 2‐4, locate the access handle on the bottom of the transducer housing. Using a 2 mm hex key,
back out the set screw in the depression on the access handle until it is flush with the handle surface. Press on the
back of the handle, as shown in the figure, and slide the handle toward the front of the unit, (the locked position), to
expose the access hole. Be sure the locking handle drops into the detent.
Note
If the access handle will not slide, the sensor linkage is most likely in an extreme position. When the lever assembly is at a hard stop
inside the housing, the locking pin on the access door may not be able to engage the mating slot in the lever assembly. This
condition can occur if the displacer has been removed, if the sensor is lying on its side, or if the instrument had been coupled to the
sensor while the displacer was not connected. To correct this condition, manipulate the sensor linkage to bring the lever assembly
to within approximately 4 degrees of the neutral position before attempting to slide the handle. A probe inserted through the top
vent of the 249 head may be required to deflect the driver rod to a position where the lever assembly is free.
4. Using a 10 mm deep well socket inserted through the access hole, loosen the shaft clamp (figure 2‐4).
5. While supporting the instrument, loosen and remove the cap screws (key 63).
6. Carefully pull the digital level controller straight off the torque tube shaft extension (key 58).
CAUTION
Tilting the instrument when pulling it off of the sensor torque tube can cause the torque tube shaft to bend. To prevent
damage to the torque tube shaft, ensure that the digital level controller is level when pulling it off of the sensor torque
tube.
7. Loosen and remove the hex nuts (key 34) from the mounting studs (key 33).
8. Pull the heat insulator (key 57) off the mounting studs.
9. When re‐installing the digital level controller, follow the appropriate procedure outlined in the Installation section.
Also setup the digital level controller as described in the Setup and Calibration section.

LCD Meter Assembly

WARNING
In an explosion‐proof or flame‐proof installation 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.
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Instruction Manual
D102748X012