K-Patents PR-03 - Manual (Page 104)

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98 PR-03 instruction manual
PRISM WASH FAILURE The prism wash works, but during the wash the TEST value
(Sanitary refractometer PR-03-A did not exceed the set TEST limit or did not increase more
and Probe refractometer PR-03-P) than the set TEST difference (Section 5.9.4).
** EXTERNAL OUTPUT FAULT ** There was no response from the External output unit, maybe
because the unit is disconnected from the IT-R. Other possible
causes are a failure in Serial bus on the IT-R or in the Output
unit.
To prevent this message when the Output unit is disconnected,
key in Calibrate / Parameters / Output signals
/ External output / Source
and select the option Not
defined (Section 5.8).
** RELAY UNIT FAULT ** There was no response from the Relay unit, maybe because the
unit is disconnected from the IT-R. Other possible causes are a
failure in Serial bus on the IT-R or in the Relay unit.
To prevent this message when the Relay unit is disconnected,
key in Calibrate / Parameters / Relays /
Relay unit
and select Not defined for each relay (Sec-
tion 5.7).
** TEMP MEASUREMENT FAULT ** The temperature value reported by the sensor corresponds to
a value below -50
◦ C or above +250 ◦ C by a margin of 10 %.
Normally means that the temperature sensor has failed and
needs to be changed.
** PRISM COATED/LED FAULT ** The light intensity of the LED is too low, normally due to
coating. Clean the prism surface. If the message persists,
check optical image (Section 7.2). If the process temperature
is very high or if process liquid has leaked into the sensor at
some point, the message may be caused by LED failure and
the LED needs to be replaced.
HIGH INTERNAL HUMIDITY Humidity inside the sensor is higher than 50 %. Normally in-
dicates leakage in the sensor. Remove the sensor from the pro-
cess line and check it according to Section 6.1.
** DETECTOR TIMEOUT ** Normally a detector card failure. If the power selector switch
in the IT-R is in the wrong position, the detector’s supply may
be incorrect. If the power selector is in correct position and
the message persists, change the Image detector card (see Sec-
tion 6.3, “Disassembling and assembling a standard length sen-
sor” and Section 6.4, “Disassembling and assembling a probe
sensor”).