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Model 14 Oxygen Analyzer

6.2. Measurement Calibration

The slope calibration can be done in air or water. The zero can be set with an electronic zero or a chemical

zero. A chemical zero uses Nitrogen gas or oxygen-free solution.

6.2.1. Slope Calibration in Air with an Electronic Zero

Temperature compensation must be set to “auto.”

6-4

CONC. CALIB.

ZERO CALIB.

ZERO CALIB. SLOPE CALIB.

SLOPE CALIB.

Select

SelectSelect

Select Select

ZERO

SLOPE

PROGRAMMING

TYPE: ElectAuto.

PROGRAMMING

EXECUTION

TYPE: Air

PO: 760.0 mmHg

Tamb.: 20.0 ˚C

EnterEnter

Enter

CALIBRATION

Select

CONC. CALIB.

TEMP. CALIB.

PARAMETERS

Enter

SLOPE CALIB.

CALCAL

21.2

ppm

60.0nA

Enter the date of

the calibration

EXECUTION

25.0 ˚C

S:3nA/ppm

Select

DATE: 01/01/98

PROGRAMMING

Enter

1. Programming

2. Execution

ZERO :

Select an electrical zero. The electrical zero is

carried out automatically by the transmitter at

regular intervals.

Select slope in air.

SLOPE :

Enter the atmospheric pressure in mmHg

Enter the ambient temperature in °C

? EXECU-

TION

SLOPE : Remove the probe from the sample and

press ENTER. The probe should be positioned

with the membrane downward.

The flashing “CAL” message indicates that the

instrument is in calibration mode.

Wait for the

current to stabilize

(approximately 1-2 min.)

and press OK to validate the calibration. The

oxygen concentration value flashes for 3 seconds.

The analyzer displays the date of the last calibra-

tion and the new slope calculated. The date can

be modify. Put the electrode back into service.

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Broadley Technologies 14 Bedienerhandbuch Seite 41

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