Instruction Manual

Instruction Manual
D103434X012
Maintenance & Troubleshooting
November 2014
51
Section 7 Maintenance & Troubleshooting7‐7‐
The DLC3020f digital level controller features modular design for easy maintenance. If you suspect a malfunction,
check for an external cause before performing the diagnostics described in this section.
Sensor parts are subject to normal wear and must be inspected and replaced as necessary. For sensor maintenance
information, refer to the appropriate sensor instruction manual.
WARNING
To avoid personal injury or property damage, always wear protective gloves, clothing, and eyewear when performing any
maintenance operations.
Personal injury or property damage due to sudden release of pressure, contact with hazardous fluid, fire, or explosion can
be caused by puncturing, heating, or repairing a displacer that is retaining process pressure or fluid. This danger may not
be readily apparent when disassembling the sensor or removing the displacer. Before disassembling the sensor or
removing the displacer, observe the appropriate warnings provided in the sensor instruction manual.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
CAUTION
When replacing components, use only components specified by the factory. Always use proper component replacement
techniques, as presented in this manual. Improper techniques or component selection may invalidate the approvals and
the product specifications, as indicated in table 1‐2. It may also impair operations and the intended function of the device.
Removing the DLC3020f 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 7‐1 lists the tools required for maintaining the DLC3020f digital level controller.