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Chemical exposure hazard. Obey laboratory safety procedures and wear all of the personal protective
equipment appropriate to the chemicals that are handled. Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local, regional and
national regulations.
5.3.1 About sensor calibration
Calibration adjusts the sensor reading to match the value of one or more reference solutions. The
sensor characteristics slowly shift over time and cause the sensor to lose accuracy. The sensor must
be calibrated regularly to maintain accuracy. The calibration frequency varies with the application and
is best determined by experience.
A temperature element is used to provide pH readings that are automatically adjusted to 25 °C for
temperature changes that affect the active and reference electrode. This adjustment can be manually
set by the customer if the process temperature is constant.
During calibration, data is not sent to the datalog. Thus, the datalog can have areas where the data is
intermittent.
5.3.2 Change calibration options
For sensors connected to a pH/ORP module, the user can set a reminder or include an operator ID
with calibration data from the Calibration options menu.
Note: This procedure is not applicable to sensors connected to an sc digital gateway.
1. Select the main menu icon, then select Devices. A list of all of the available devices shows.
2. Select the sensor and select Device menu > Calibration.
3. Select Calibration options.
4. Select an option.
Option
Select standard
buffer
Calibration
reminder
Operator ID for
calibration
5.3.3 pH calibration procedure
Calibrate the pH sensor with one or two reference solutions (1-point or 2-point calibration). Standard
buffers are automatically recognized.
1. Put the sensor in the first reference solution (a buffer or sample of known value). Make sure that
the sensor portion of the probe is fully immersed in the liquid
Description
For pH sensors only—Sets the pH buffers used for auto correction calibration. Options:
4.00, 7.00, 10.00 (default set), DIN 19267 (pH 1.09, 4.65, 6.79, 9.23, 12.75) or NIST
4.00, 6.00, 9.00
Note: Other buffers can be used if the 1-or 2-point value calibration is selected for
calibration.
Sets a reminder for the next calibration (default: Off). A reminder to calibrate the sensor
shows on the display after the selected interval from the date of the last calibration.
For example, if the date of the last calibration was June 15 and Last calibration is set to
60 days, a calibration reminder shows on the display on August 14. If the sensor is
calibrated before August 14, on July 15, a calibration reminder shows on the display on
September 13.
Includes an operator ID with calibration data—Yes or No (default). The ID is entered
during the calibration.
W A R N I N G
C A U T I O N
(Figure
4).
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