PART THREE - OPERATION
SECTION 5 - CALIBRATING THE ANALYZER
Accu4™ Low-range Turbidimeter System
Rev. 2-300
50
S
ECTION
5
5.1 Things to Know
About Calibration
☞
☞
The Accu4™ Low-range Turbidimeter System can be cali-
brated using one of three methods:
•
PRIMARY CAL: Requires entering a primary standard
value of a formazin suspension.
•
CUBE CAL: Requires inserting an optional Cal-Cube
TM
assembly into the sensor flow chamber and entering its
factory-certified standard value.
•
SAMPLE CAL: Requires entering a sample value deter-
mined by laboratory analysis or calibrated portable
meter.
You can conveniently verify system calibration at any
time, regardless of the method used, with the optional
GLI Cal-Cube™ assembly. Refer to Part Three, Section
6.2 for complete details.
NOTE:
The sensor is equipped with long-lasting light
sources and detectors. If these components are
eventually replaced, always re-calibrate the system
using the appropriate method to ensure measure-
ment accuracy. Also, re-calibrate if the cable length
between sensor and analyzer changes.
The mA value for each analog output can also be calibrated
(Section 5.5).
NOTE:
When the passcode feature is enabled (Section
4.5), you must successfully enter the passcode
before attempting to calibrate the analyzer.
An in-progress calibration can always be aborted by
pressing the
ESC key
. After the “ABORT: YES?”
screen appears, do one of the following:
•
Press
ENTER key
to abort. After the “CONFIRM
ACTIVE?” screen appears, press
ENTER key
to
return the analog outputs and relays to their ac-
tive states (MEASURE screen appears).
•
Press
×
×
or
Ø
Ø
key
to choose the “ABORT: NO?”
screen, and press
ENTER key
to continue cali-
bration.
CALIBRATING THE ANALYZER
