5
OPERATION
40
OPTISENS TUR 2000
www.krohne.com
07/2017 - 4001970202 - MA OPTISENS TUR 2000 R01 en
5.4 Troubleshooting
5.5 Function tables
Problem
Possible cause
Remedy
No values are displayed
No power supply available or
sensor cable not connected.
Check electrical connection
No sensor reaction
Deposits on the measurement
element
Clean the measurement window
of the sensor
Window is damaged
Calibrate and if outside of
specification, replace the sensor
and send to manufacturer for
repair
Indicated values are too high
Deposits on the window
Clean the measurement window,
verifiy and in case of need
recalibrate
Window is damaged
Calibrate and if outside of
specification, replace the sensor
and send to manufacturer for
repair
Indicated values fluctuate
Entrained air/air bubbles
Install a bubble trap upstream of
measurement or move
measurement location by a few
centimeters
Sensor reads zero where it should
not
Measurement windows totally
covered so that no scattered light
come back
Clean the sensor
Sensor does read too high in a
1 NTU standard
Reflection from cup used
Use different bucket, tilt sensor at
an angle and cover cup/bucket
No connection between PC and
sensor within 8 seconds
Terminal program was connected
before sensor
Power up sensor and connect
terminal program
Sensor does not answer via RS485
but is connected the correct way
(2400/4800/9600 or 19200 bits)
Baud rate programmed wrong
Try with different baud rate
Dry error on signal converter or
via RS485
The sensor is not well immersed
into the sample
Put the sensor into the water
Air bubbles are trapped on the
lense
Check the mounting position
Foul error on signal converter or
via RS485
Dirty or damaged lens surface
Clean the sensor
External light error on signal
converter or via RS485
The ambient light is too high to
saturate the turbidity signal
Install the sensor that less light
can be reflected into the
measurement window
Measurement setting
Setting options or allowed values Default value
Possibles scales
0.000...4.000 / 40.00 / 400.0 NTU
400.0 NTU
Zero adjustment
±
0.400 NTU on all scales
0 NTU
Sensitivity adjusement
70...130%
100%
Zero standard solution
0.000...400.0 NTU
0.020 NTU
Sensitivity standard solution
0.000...400.0 NTU
400.0 NTU