PART THREE - OPERATION
SECTION 6 - TEST/MAINTENANCE
Accu4™ Low-range Turbidimeter System
Rev. 2-300
64
3.
Temporarily insert the Cal-Cube™ assembly:
A.
Turn 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).
B.
If the recommended isolation valve is used down-
stream of the sensor OUTLET, open the valve to
atmospheric pressure to improve draining.
C. Drain any remaining process from sensor by re-
moving funnel from its holder and lowering it below
the sensor height. When drained, replace funnel
into holder.
D. Remove the flow chamber cover and baffle assem-
bly from the sensor flow chamber. Refer to Figure
4-1 (standard sensor design) or Figure 4-2 (high
pressure sensor design) for assembly details.
E.
Wipe away all moisture from inside the chamber
with a clean, dry, soft cloth.
F.
Note the factory-certified value on the Cal-Cube™
assembly, and insert the cube into the sensor in
place of the baffle assembly. Without replacing the
flow chamber cover, close sensor enclosure door.
4.
If the reading is within ± 10% of the Cal-Cube™ value,
the system is “in calibration.” If not, re-calibrate (see
Part Three, Section 5.2, 5.3, or 5.4 for details).
5.
After checking calibration, remove the Cal-Cube™
assembly and re-install the baffle assembly.
6.
Replace the flow chamber cover. Make sure the cover
O-ring is well lubricated with the supplied silicone lubri-
cant. If not, the cover may be difficult to remove the
next time.
7.
Turn the sensor’s 3-way valve handle to the
OPERATE
position as shown by the label at the base of the flow
chamber (
Ö
Ö
points towards INLET fitting).
8.
Press
ENTER key
to display the active measurement
reading on the “CONFIRM ACTIVE?” output status
screen. When the reading corresponds to the actual
typical process value and is stable, press
ENTER key
again to change the analog output states back to active.
