Maintenance; Troubleshooting - Mettler Toledo InPro 7100-VP-Serie Bedienungsanleitung

InPro 7100-VP Series
4.2

Maintenance

Dirty or contaminated sensors can deliver incorrect measurement values.
If fouling is presumed, the sensor is to be removed from operation and the
electrodes as well as the insulation between the electrodes cleaned with
a soft cloth. Do not clean electrodes with an abrasive paper or pad.
Suitable cleaning solutions are mild detergents or strongly diluted acids
(< 0.5 % by wt.) such as nitric acid. Never use cleaning agents that are
not compatible with the material to be cleaned.
When handling acids, precautionary measures are to be taken.
The sensor must be thoroughly flushed with distilled water prior to re-
installation.
Following cleaning and re-installation into the process, it can take from
several minutes up to several hours until the sensor delivers the originally
measured value.
4.3

Troubleshooting

Error
No signal on display
No temperature signal
Incorrect or unstable
measurement reading
© 10 /12 Mettler-Toledo AG, CH - 8606 Greifensee
Printed in USA
Possible cause
Electrical connections
either missing or
incorrectly in place.
Sensor is not in contact
with the sample medium
Temperature probe is
not connected
Transmitter does not support
Pt1000 RTD
Sensor is contaminated/
fouled
Sensor is installed too
near to pipe wall
Ensure minimum distance of 30 mm (1.18") between sensor tip and pipe
wall is maintained.
Corrective action
Check all connections
and associated cabling
Check installation
for air pockets
Check all connections
and associated cabling
Replacement of transmitter
or sensor necessary
Clean the sensor
(electrodes)
Ensure minimum distance
of 30 mm (1.18") between
sensor tip and pipe wall is
maintained (see drawing)
InPro 7100-VP Series
52 002 092
17