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Instruction Manual Clarity II T56
PN-51-T56 May 2012
Calibration 25
Section 7.0 Calibration
7.1 Calibration – Introduction
Calibration is the process of adjusting or standardizing the analyzer to a lab test or a calibrated
laboratory instrument, or standardizing to some known reference. Completion of Quick Start
upon first power up enables live measurements but does not ensure accurate readings in the
lab or in process. Calibration should be performed with each attached sensor to ensure accu-
rate, repeatable readings.
7.2 Turbidity
This section describes how to calibrate the turbidity sensor against a user-prepared standard as
a 2-point calibration with deionized water, against a 20 NTU user-prepared standard as a single
point calibration, and against a grab sample using a reference turbidimeter.
To calibrate the turbidity sensor, access the Calibration screen by pressing ENTER/MENU from the
main screen, select S1 or S2 Measurement and press ENTER/MENU. Press INFO at any time to learn
more about this procedure. A yellow screen will appear with detailed instructions and information.
The following calibration routine is covered:
1. Slope Calibration Slope cal with pure
water and a standard of known
turbidity
2. Standardize Calibration
Standardizing the sensor to a known
turbidity
3. Grab Calibration Standardizing the
sensor to a known turbidity based on a
reference turbidimeter
1. To calibrate the turbidity loop using Slope Calibration with pure water and a standard of
known turbidity, follow the step-by-step procedures displayed on-screen.
2. To calibrate the turbidity loop using Standardize Calibration by Standardizing the sensor to
a known turbidity, follow the step-by-step procedures displayed on-screen.
3. To calibrate the turbidity loop using Grab Calibration by Standardizing the sensor to a
known turbidity based on a reference turbidimeter, follow the step-by-step procedures
displayed on-screen.