Hach-lange ORBISPHERE Model 51x User Manual Manuel d'utilisateur télécharger pdf (Page 63)

Calibration menu

7.1 Definitions

7.2 EC gas sensor calibration

Definitions

We define 2 types of calibration:

• the calibration of the gas to measure (e.g. O

for an O

sensor)

• the calibration of interferences (e.g. H

O for a CO

sensor)

To calibrate the gas to measure (main gas), the user usually puts the sensor in the main gas without any

interfering gas.

To calibrate the interferences, the user usually puts the sensor in the interfering gas without any of the

main gas.

Calibrations can only be performed once the instrument has been installed, configured and each channel

has been set up. You must also ensure that you have the correct access rights to access the calibration

menu (minimum of level 2 for sensor calibrations and level 3 for barometric pressure calibration).

Select sensor calibration from the calibration menu, then select the channel to calibrate.

There are two types of gas sensor calibration available, depending on the gas being measured and the

type of sensor being used:

1. In Air: For Oxygen and Ozone with an EC sensor.

2. Direct value: Any gas with either an EC or TC sensor. This calibration exposes the sensor to a gas

with a known partial pressure, or a liquid sample with a known gas concentration.

Note: All the calibration information for a smart EC Sensor is stored in the sensor’s memory. When a

smart sensor is connected to the instrument for the first time, a calibration report (see example in

Calibration reports on page 66) is automatically generated giving the details of the last calibration.

If the sensor being calibrated is an EC sensor, follow the instructions in the next section entitled EC gas

sensor calibration. For TC sensors, refer to TC gas sensor calibration on page 63.

Calibration of the measured gas

Start Before initiating a calibration process, the calibration parameters must be

set by pressing on the Modify button. The last calibration parameters are

memorized, so this step can be ignored if the correct parameters are

already set.

Note: When calibration is started, a calibration event is set, and the analog

output and relay are put on hold (if selected below) to avoid unwanted alarms

or potential process problems. This resumes when calibration is finished.

Modify calibration

parameters

• Calibration mode: 2 types available, depending on the gas being

measured:

• Direct value: Any gas

•In Air (default): For O

or O

•Medium: Select liquid or gas (direct calibration only)

• Concentration unit type: Partial, fraction or dissolved (dissolved is

for calibration in a liquid only)

• Concentration unit: The list of available units depends on unit type

selected above.

•Liquid: Select as appropriate, available when liquid has been selected

in medium (above).

• Enter the gas concentration according to the value in the calibration

media, when direct value is used

• Hold during calibration: On by default, this stops any output from the

instrument during the calibration process to avoid sending invalid

information to any connected device.

• Interference enabled: If selected, this takes into account the influence

of interferences (see settings below) during calibration. By default the

same interference as during measurement is selected.

Press OK to start calibration

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Hach-lange ORBISPHERE Model 51x User Manual Manuel d'utilisateur Page 63

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