AccUView LED (1/2020)
Rev 2
12
5.2 ABS Calibration
Before starting the calibration procedure, be sure to turn off the instrument’s
ultrasonic cleaning option. See section 7.10 for instructions.
1.
Select the calibration function of the instrument by pressing the
MODE/EXIT
button
once. The arrow beside
CAL
will be illuminated on the display. The lower display
shows alternating
0
(indicating that the 0.000ABS standard is requested) and
↵
. Once
in the calibration menu the last reading has now been stored and the equivalent reading
is being output on the 4-20mA signal. This output will be held after the instrument
returns to AUTO, allowing time for the flow to be restarted.
2.
Close off the flow of water using the shutoff clamp.
3.
Remove the flow through cuvette, and retain for future cleaning and use.
4.
Fill the second clean cuvette with 100% T/0.000 ABS calibration fluid and reinstall
the filled cuvette on the flow through unit.
5.
Wipe flow through unit dry
, install and lock in place.
6.
Press the
↵
button to start the calibration.
7.
The upper display will count down the progress of the calibration step.
8.
The instrument will return to
AUTO
mode at the end the calibration
.
9.
The shutoff clamp should now be released to restore sample flow.
10.
Do not move flow head after calibrating
.
Since the instrument stored the reading previous to calibration, the previous reading may
appear after calibration for at least 30 seconds. The reading will then update to the current
reading. How fast this upgrades occurs depends on the
CONFIG
settings for
RESP
(response time) and
UV-T
(lamp duty cycle).
There is no need to recalibrate when changing ranges from %T to ABS or the reverse.
It is recommended that the flow through unit be removed for as short an interval as
possible to prevent premature saturation of the desiccant.
The UV lamp is of very low power but is recommend to avoid looking directly into
the optical well while the flow through unit is removed.
