PART THREE - OPERATION
SECTION 5 - CALIBRATING THE ANALYZER
Accu4™ Low-range Turbidimeter System
Rev. 2-300
58
1.
With the process flowing through the sensor, press
MENU key
to display
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.
2.
With the “CALIBRATE” line selected (shown in reverse
video), press
ENTER key
to display
.
3.
With the “SENSOR” line selected, press
ENTER key
to
display
.
4.
Use
Ø
Ø
key
to select the “SAMPLE CAL” line and press
ENTER key
to display
. Use
×
×
or
Ø
Ø
key
to view the three states that the analog outputs
(and relays) can be in during calibration:
•
HOLD OUTPUTS:
Holds their present mA values.
•
XFER OUTPUTS:
Transfers to preset mA values.
•
ACTIVE OUTPUTS:
Responds to measured turbidity.
5.
With the desired choice displayed, press
ENTER key
to
enter this selection.
6.
With the
screen displayed and the
process flowing through the sensor, press
ENTER key
to confirm. This active
screen appears
showing the measurement reading.
7.
Wait for the reading to stabilize which may take up to
15 minutes. Then press
ENTER key
. The “PLEASE
WAIT” screen may appear if the reading is still too un-
stable. After the reading has stabilized, this static
screen appears showing the “last-
entered” calibration value.
8.
Obtain a process sample and determine its NTU value
using laboratory analysis or a calibrated portable meter.
