wtw Multi 3620 IDS User Manual

Conductivity Multi 3620 IDS
59 ba77169e01 04/2016
8.3 Calibration
8.3.1 Why calibrate?
Aging slightly changes the cell constant, e.g. due to coatings. As a result, an
inexact measured value is displayed. The original characteristics of the cell can
often be restored by cleaning the cell. Calibration determines the current value
of the cell constant and stores this value in the meter.
Thus, you should calibrate at regular intervals.
8.3.2 When to calibrate?
 After connecting a sensor
 Routinely within the framework of the company quality assurance
 When the cleaning interval has expired
8.3.3 Determining the cell constant (calibration in control standard)
You can determine the actual cell constant of the IDS conductivity sensor by
calibrating with the control standard in the following range:
 0.450 ... 0.500 cm
-1
(e.g. TetraCon 925, nominal cell constant 0.475)
The cell constant is determined in the control standard, 0.01 mol/l KCl.
In the default condition, the calibrated cell constant of the IDS sensor is set to
0.475 cm
-1
(IDS conductivity sensor TetraCon 925).
Stability control
(AutoRead)
In calibration, the Stability control function (AutoRead) is automatically acti-
vated.
For this calibration procedure, the Type setting must be set to cal. Proceed as
follows to determine the cell constant:
Salinity (sea-
water)
Automatic nLF according to IOT
(International Oceanographic
Tables)
Sal, nLF
Test sample Temperature compensation Display indica-
tor
1 Connect an IDS conductivity sensor to the meter.
2 In the measured value display, select the conductivity parameter with
<M>.
3 Start the calibration with <CAL>.
The cell constant that was calibrated last is displayed.

wtw Multi 3620 IDS Specifications

General

Brand	wtw
Model	Multi 3620 IDS
Category	Measuring Instruments
Language	English