PART THREE - OPERATION
SECTION 5 - CALIBRATING THE ANALYZER
Rev. 2-300
Accu4™ Low-range Turbidimeter System
53
☞
C. With the “SENSOR” line selected, press
ENTER
key
to display
.
D. With the “PRIMARY CAL” line selected, press
ENTER key
to display
. Use
×
×
or
Ø
Ø
key
to view the three states that the analog out-
puts (and relays) can be in during calibration:
•
HOLD OUTPUTS:
Holds their present values.
•
XFER OUTPUTS:
Transfers to preset values.
•
ACTIVE OUTPUTS:
Responds to measured turbidity.
E.
With the desired choice displayed, press
ENTER
key
to enter this selection.
2.
Turn the sensor’s 3-way valve handle to the
CALIBRATE
position as shown by the label at the base
of the flow chamber (
Õ
Õ
points towards funnel hose).
3.
If the recommended isolation valve is used downstream
of the sensor OUTLET, open the valve to atmospheric
pressure to improve draining.
4.
Drain any remaining process from the sensor by removing
the funnel from its holder and lowering it below the sensor
height. When drained, replace funnel into holder.
5.
Remove the baffle assembly from the flow chamber and
rinse it with clean water.
6.
Clean the inside of the flow chamber and the light source
and detector windows with a soft, clean, damp cloth.
7.
Re-install the baffle assembly into the flow chamber,
and replace and tighten the flow chamber cover.
NOTE:
The following steps 8, 9, and 10 ensure that only
pure, primary standard formazin suspension is be-
ing measured in the sensor flow chamber.
8.
Rinse the sensor’s internal tubing with the primary
standard formazin suspension by pouring it into the
funnel until the suspension can be seen in the clear
SIGHT TUBE. Now drain this rinse suspension in the
same way as described in step 4.
