KROHNE OPTISENS OAS 2000 EN - Manual (Page 36)

5
OPERATION
36
OPTISENS OAS 2000
www.krohne.com 07/2010 - MA OAS 2000 R02 en
Calibration of submersible sensor in a basin or channel
• Calibration can be done without the use of a bucket. Make sure that the sensor is at least
30 cm / 11.8" below the lowest liquid level.
• Follow the steps 3 to 5 of the above procedure "Calibration with a sample bucket".
• While the OAS 2000 is calibrating, grab a sample of the liquid with a dip bucket. Make sure to
grab a sufficiently large sample volume for low solids applications.
• Take the sample to the lab for analysis. Note the concentration of the sample determined at
the lab.
• Follow the steps 8 to 10 of the above procedure "Calibration with a sample bucket".
Calibration of inline sensor in a pipe
• Inline sensors are easiest calibrated if the pipe has a sample outlet.
• Follow the steps 3 to 5 of the above procedure "Calibration with a sample bucket".
• While the OAS 2000 is calibrating, open the sample valve and fill a bucket with process liquid.
• Take the sample to the lab for analysis. Note the concentration of the sample determined at
the lab.
• Follow the steps 8 to 10 of the above procedure "Calibration with a sample bucket".
5.4 Scaling
The menu Scale / Alarm Scale / Alarm Scale / Alarm Scale / Alarm (see converter manual) allows the user to set the high and low
boundaries for a 4...20 mA output signal. In addition, this menu allows the user to set high and
low alarm values to switch a relay when solids have reached critical points.
Max Max Max Max Sets the 20 mA point output.
Min Min Min Min Sets the 4 mA point output (may be negative for special applications).
Hi-Alarm Hi-Alarm Hi-Alarm Hi-Alarm Sets the high alarm set point (the value zero inactivates the alarm).
Low-Alarm Low-Alarm Low-Alarm Low-Alarm Sets the low alarm set point (the value zero inactivates the alarm).
.book Page 36 Friday, July 2, 2010 1:49 PM