Trouble-shooting TMT162
34 Endress+Hauser
!
Note!
If more than one fault is active, then the fault with the highest priority will be displayed. Once this
fault has been remedied the next fault is displayed! Multiple fault occurances can be recognized by
an "Offset" of 1000.
Unit reaction to sensor faults
The icon "Warning" and error code appear in the display on warnings and errors. On error, the
bargraph in the display also flashes - instead of the measured value only the error code is displayed.
(See also chapter 5.2).
9.2.1 Corrosion detection
Sensor connection cable corrosion can lead to false measured value readings. Therefore our unit
offers the possibility to recognize any corrosion before the measured values are affected.
There are 2 different steps selectable dependent on the application requirements:
• off (warning output just before reaching the alarm set point. This allows preventative
maintenance/trouble-shooting to be done).
• on (no warning. immediate alarm)
The following table shows the reaction of the device on sensor cable connection resistance change.
These also indicate the reaction dependent on the parameter selection on/off.
!
Note!
Corrosion detection only for RTD 4-wire connection
206 Warning:
Sensor 1 corrosion
Monitor sensor 1 M
207 Warning:
Sensor 2 corrosion
Monitor sensor 2 M
208 Unit reset to factory default values - 0
209 Device initialization - 0
+1000 Other faults active Remove displayed faults
1) The modes have the following meaning: F: Fault, C: Device in service mode, M: Maintenanca required, S: Out of
specification, *: depends on mode (F or M). See also section 6.4.2 Supported HART
®
commands.
Fault code Cause Action/Remedy Mode
1)
PV = SV1
(2 Sensor inputs)
PV = SV1 - SV2
(Differential)
PV = (SV1+SV2)/2
(Average value)
PV = SV1 (or SV2)
(Sensor back-up)
S1 defective Fault Fault Fault Warning
S2 defective Warning Fault Fault Warning
S1 and S2 defective Fault Fault Fault Fault
Drift alarm
(IS1-S2I > limit value)
- Fault Fault Fault
Drift warning
(IS1-S2I > limit value)
- Warning Warning Warning
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