Operating Instructions

23Operating Instructions VisiFerm
™
mA Sensors
MAINTENANCEMAINTENANCE
No communication between the sensor and ArcAir.
This may be due to a hardware failure.
Figure 11: Description of the traffic lights on ArcAir
7. 2 Replacing the ODO Cap
The exchange of ODO Cap is performed very easily:
1) Unscrew the ODO cap from the shaft (Figure 12)
2) Exchange the O-ring
3) Screw firmly the new ODO Cap onto the sensor shaft again
4) Perform sensor calibration (Chapter 7.3)
NOTE: If the ODO Cap is mounted very firmly on the
shaft, and if you cannot obtain a good grip on the
stainless steel with your fingers, a silicone tube between
your fingers and metal may supply a better grip.
O-ring
unscrew
Figure 12: Replacing the ODO cap
7. 3 Calibration
The VisiFerm mA sensors provide two kinds of sensor calibration:
automatic standard calibration, and product calibration. The
automatic standard calibration and the product calibration may
be performed using ArcAir (see chapter 5.2).
7. 3 .1 Automatic Standard Calibration with
ArcAir
VisiFerm mA sensors are calibrated at two points: in air and in an
oxygen-free environment. During calibration, the sensor controls
automatically the stability of the oxygen and temperature signals.
NOTE: For greater measurement accuracy ensure that
temperature difference between calibration medium and
process medium is minimal. Make sure you compensate
humidity and pressure during calibration.
NOTE: A 2-point calibration in air and Nitrogen is only
required: • For each new ODO Cap replacement
• If high accuracy is needed
NOTE: No oxygen measurement is performed at a
temperature higher than 85°C to protect the optoelec-
tronics and enhanced the sensor lifetime.
ATTENTION! Please scan the barcode or enter the
data into ArcAir prior first use of a replacement cap.
7 Maintenance
Periodic maintenance routines need to be run in order to
ensure safe and reliable operation and measurement of sensor
and the accessories.
ATTENTION! Avoid any contact of the equipment
with corrosive media.
ATTENTION! Please screw the protection cap on
the M12 sensor connector when disconnecting the
sensor M12 cable.
7.1 Verify Sensor Status and ODO Cap
Functionality
1) Power the sensor with the M12 Sensor Power Cable and
connect the sensor to ArcAir
2) Control the status (Figure 11)
3) Please refer to the troubleshooting (Chapter 8) for the
next steps if the traffic light is not green
4) Control the quality of the sensor, ODO cap or measurement
in ArcAir under Sensor Information or Quick View / Sensor
Health and change the ODO Cap or sensor if required
( C h a p te r 7. 2 )
NOTE: The lifetime of the VisiFerm mA highly depends
on the specific conditions of the application. Temperature,
pressure, chemicals used may accelerate the ageing of
both the sensor and its ODO cap. A warning «Maintenance
required» remains active as long as the cap or sensor
quality is below 40%. Make sure that after new cap or
sensor replacement the measurement quality status is
green. The measurement quality status takes sensor and
cap into account.
The sensor is performing correctly.
No errors or warnings have been registered.
At least an error or a warning has been registered.
Verify the sensor errors and warnings in Sensor Status.