Hach Ultra ORBISPHERE 510, Руководство оператора

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Orbisphere 510/511/512 Analyzers - Calibration Menu 57 of 138
Operator Manual
ORBISPHERE
5.1 Definitions
We define 2 types of calibration:
• the calibration of the gas to measure (e.g. O
2
for an O
2
sensor)
• the calibration of interferences (e.g. H
2
O for a CO
2
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 61 .
5.2 EC Gas Sensor Calibration
5.2.1 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 relays for that channel are put on
hold (if selected below) to avoid unwanted alarms or
potential process problems. This resumes when
calibration is finished.