11 Operation using PROFIBUS
®
PA TMT84
60 Endress + Hauser
n: Number of the Transducer Block (1-2) or the sensor input (1 or 2)
Submenu Setup - Advanced setup
Corrosion monitoring
Sensor connection cable corrosion can lead to false measured value readings. Therefore the unit
offers the possibility of recognizing any corrosion before a measured value is affected. Corrosion
monitoring is only possible for RTDs with a 4-wire connection and thermocouples.
Sensor drift detection
If two sensors are connected and the measured values differ by a specified value, an error or a main-
tenance prompt (sensor drift detection) is sent to the distributed control system. The drift detection
function can be used to verify the correctness of the measured values and for mutual monitoring of
the connected sensors.
The drift detection can be activated with the Type of measurement parameter. A distinction is made
between two separate modes. For the measuring mode "PV =(|SV1-SV2|) if PV < sensor drift
detection limit value", a status message is output is the limit value is undershot or, in the case of
"PV =(|SV1-SV2|) if PV> sensor drift detection limit value", if the limit value is overshot.
Threshold value n read/
write
Value for switching in PV mode for sensor switching.
Entry in the range of -270°C to 2200°C (-454°F to
3992°F).
Factory settings:
0
Reference Junction
Type n
read/
write
Configuration of reference junction measurement for tem-
perature compensation in thermocouples:
• 0 - no reference: no temperature compensation is used.
• 1 - internally measured reference junction: internal ref-
erence junction temperature is used for temperature
compensation
• 2 - external fixed value: "Ext. Reference Junction Tem-
perature" is used for temperature compensation.
Factory settings:
Internally measured reference junction
Ext. Reference
Junction Tempera-
ture n
read/
write
Value for temperature compensation (see Reference
Junction Type n).
Factory settings:
0.0
Setup
Menu item Parameter
"Setup" Name
Parame-
ter access
Description
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