Chapter 4
– Service, Configuration & Testing
24
FT742-DM (4-20mA)
– Sensors
- User Manual
4 SERVICE, CONFIGURATION & TESTING
4.1 Inspection
The following checks are required to identify any signs of corrosion or damage on the sensor which may hinder
its performance. It is recommended that these checks be carried out annually.
Mechanical damage
; Check the sensor body for signs of damage, paying particular attention to the seals. Also
inspect for signs of lightning damage which may appear as burns or scorch marks (or burnt smells). If damage
has occurred replace the sensor immediately. Inspect the hydrophobic cavity coating for wear, corrosion and
damage.
Corrosion
; Inspect the mounting surface of the sensor and the surfaces of other mounting parts for signs of
corrosion. If corrosion is present on any surface, it should be removed using an abrasive cloth. Check that any
mechanical fixings are in good condition with no signs of corrosion and tighten as necessary. If corrosion is
present replace with parts of the appropriate finish (see Section 3).
Interconnection cable;
Inspect the condition of the cable. If any part has become frayed or damaged in any
way, it should be replaced immediately. Intermittent cable faults may not be visible, but may show up as errors
in data. See Section 2.2.6 for details on how to identify such faults. Confirm the intended network component
values.
