K-Patents PR-01-S - Manual (Page 45)

INSTRUCTION MANUAL FOR K-PATENTS PR-01-S (-AX/FM/CS) DOCUMENT/REVISION No. INM 1/14
Effective: May 15, 2009
43
6. MAINTENANCE
6.1. REGULAR MAINTENANCE
The need for regular maintenance is minimal, due to the construction with no moving parts, no trimpots
and with a solid-state light source. The following rules apply:
– Keep the sensor head and the Indicating transmitter clean and dry.
– Check that the ambient temperature is not above +45 °C (113 °F). The sensor head should not be too
hot to keep a hand on.
– Check that the prism wash works, see Section 8.1.
– Once a year check that the prism surface is smooth and clean. To replace prism or gaskets see section
6.7.
– The PR-01-S sensor has an internal moisture detector, except in PR-01-S-AX/FM/CS. The reading is
obtained from the Indicating transmitter display (Key sequence: Display/Sensor Head). Check that
reading once a month. An increasing signal indicates condensate forming in the sensor head (if the
process temperature is below ambient) or prism leakage. If the moisture reading exceeds 30%, change
the drying agent. If the reading exceeds 50%, check the prism seals.
– Inside the sensor head cover is a desiccant i.e. drying agent. The desiccant is a plastic package full of
ENVIROGEL. When the desiccant is dry and working, it is yellow. When the desiccant turns green, it
needs to be replaced. The desiccant cannot be reactivated (i.e. dried), it must be replaced. You can
order new desiccant packages (dryers), spare part number PR-3107, from K-Patents.
6.2. DIAGNOSTICS
For a systematic approach to the identification of a faulty component a basic understanding of the
operation is necessary. Read sections 2.3 to 2.8 for general information. Use flow diagram Figure 6.20 for
guidance.
The trouble shooting normally starts with a check of the Diagnostic message (Table 6.30). Remember that
a sluggish or irregular output signal can result from unfavorable process flow conditions, Section 3.1.
Figure 6.21 gives a general description of the information and power flow between different parts of the
total system. Section 6.4 gives a complete description of the Indicating transmitter. Figure 6.22 shows the
signals cable. Section 6.5 describes the Sensor and the optical image. Section 6.6 gives the details of the
temperature measurement.