Instructions for Use SS 20.261
Page 15
6 Startup
Prior to switching on the
SCHMIDT
®
Flow sensor SS 20.261
, the
following checks have to be carried out:
Immersion depth of the sensor probe and alignment of the housing
Tightening of the fastening screw of the through-bolt joint, correct
installation of safety chain
Correct electrical connection in the field (switch cabinet or similar)
!
For measurements in media with overpressure check if the
fastening screw is tightened properly (10 … 15 Nm). Make
sure to close the safety chain before pressure is applied.
5 seconds after switch-on the sensor is ready for operation. If the sensor
has another temperature than the ambient, this time is prolonged until
the sensor has reached its ambient temperature.
If the sensor has been stored at very cold conditions, before
commissioning you have to wait until the sensor and its housing have
reached ambient temperature.
7 Information concerning operation
The sensor is optimized for an operating overpressure of 8 bar
op
. If it is
used with lower pressures, the detection limit (DL) rises slightly.
Example: DL (8 bar
op
) = 0.2 m/s, DL (0 bar
op
) = 0.8 m/s
!
Soiling or other gratings on the sensor cause distortions of
measurements.
Therefore, the sensor must be checked for soiling at regular
intervals and cleaned if necessary.
!
(Condensating)
liquid on the sensor
causes
serious
measurement distortions.
After drying the correct measuring function is restored.
