EUTECH INSTRUMENTS TURBIDIMETER TN-100 WATERPROOF PORTABLE METER Manuál s instrukcemi stáhnout pdf (Strana 9)

Instruction Manual TN-100/ T-100

2 TURBIDITY CALIBRATION

The TN-100/ T-100 turbidimeter was calibrated and tested prior to leaving

the factory. Therefore, it is possible to use the instrument directly out of

the box. However, re-calibration of the instrument is recommended to help

you become familiar with the operation of the instrument and the

calibration procedures. In addition, re-calibration is recommended at least

once every month for optimum accuracy.

It is recommended that you perform a full calibration using all 4 standards

provided to ensure full-range accuracy.

However, the TN-100/ T-100 turbidimeter provides flexibility for you to

calibrate at selected ranges suitable for your application.

2.1

Calibration Standards

We recommend that you use the following materials during calibration to

achieve the accuracy stated in this manual:

 CAL 1: 800 NTU Calibration Standard

 CAL 2: 100 NTU Calibration Standard

 CAL 3: 20.0 NTU Calibration Standard

 CAL 4: 0.02 NTU Calibration Standard

It is well known that diluted Formazin is unstable. If you choose to use

Formazin to calibrate the instrument, ensure that you are using a fresh

stock suspension of Formazin to achieve the accuracy quoted for the

instrument. Calibration standards offered are more stable than Formazin

and have a limited shelf life of 12 months. If you use the supplied

calibration standards to calibrate the instrument, review the expiration date

(indicated on cap label) to ensure that the standards have not expired.

2.2

Indexing

Due to the high quality of the glass vials provided, indexing is not required.

You only need to align the mark on the vial with the mark on the meter.

However, in order to achieve a better accuracy of the measurement, you

can proceed with indexing of the vials. See Section 8.5 - Indexing a Vial

on page 20 for more information.

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EUTECH INSTRUMENTS TURBIDIMETER TN-100 WATERPROOF PORTABLE METER Manuál s instrukcemi Strana 9