Endress+Hauser iTEMP TMT84 - Page 42

Troubleshooting TMT84
42 Endress+Hauser
!
Note!
The specified status can increase by the value 1 (low limit), 2 (high limit) or 3 (constant) due to a
limit violation. The increase of the status value can result from a limit violation of the error directly
displayed or be transferred from a low-priority error when more than one status occurs
simultaneously.
Example:
9.3.5 Corrosion monitoring
Sensor connection cable corrosion can lead to false measured value readings. Therefore the unit
offers the possibility to recognize any corrosion before a measured value is affected.
!
Note!
Corrosion monitoring is only possible for RTD with 4-wire connection and thermocouples.
2 different stages can be selected in the CORROSION_DETECTION parameter (see chapter 11)
depending on the application requirements:
• Off (no corrosion detection)
• On (warning output just before reaching the alarm value - see table below. This allows for
preventative maintenance/troubleshooting to be done.) An alarm message is output as of the
alarm value)
The following table describes how the device behaves when the resistance in a sensor connection
cable changes depending on whether the on or off option has been selected.
The sensor resistance can affect the resistance data in the table. If all the sensor connection cable
resistances are increased at the same time, the values given in the table are halved.
The corrosion detection system presumes that this is a slow process with a continuous increase in
the resistance.
C- 501 Device status messages (PA):
Device Reset
C-501
Local display:
C501  Measured Value
1 = 0x4C*/0x4F
2 = UNCERTAIN
3 = Init value/- -
4 = OK
Cause of error:
Device reset is performed.
Remedy:
Message is only displayed during reset.
SV1, SV2, PV1,
PV2, RJ1, RJ2
Categ
ory
No. Status messages
– In physical block
– diagnostics code
– Advanced diagnostics
– Local display
Sensor Transducer Block measured value
status
1 = Status (profile 3.01/3.02)
2 = Quality (profile 3.01/3.02)
3 = Substatus (profile 3.01/3.02)
4 = Limits
Cause of error/remedy Output variables
affected
*) see note on  ä 42
Quality (BAD) Quality Substatus Limits
Error (E) 001001xx = 0x24
0x27
RTD <  2 k 2 k  < x<  3 k >  3 k
off --- No alarm No alarm
on --- WARNING (M-042) ALARM (F-042)
TC <  10 k 10 k  < x<  15 k >  15 k
off --- No alarm No alarm
on --- WARNING (M-042) ALARM (F-042)