Hach-Lange HQD - Gel filled ORP_Redox electrode MTC - Manual (Page 5)

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Run check standard
The run check standard feature validates instrument performance between sample
measurements. Use the run check standard feature for periodic or user-defined interval
measurement of a traceable standard solution. Set the criteria for check standards from
the MTC101 settings menu.
Note: Access control must be off or a valid password entered before any of the check standard
method options can be changed.
1. Select Run Check Standard from the Meter Options menu.
Note: Select the appropriate probe if two probes are connected to the meter.
2. Obtain the standard solution specified in the display.
3. Place the electrode in the standard solution and select READ . The display will show
Stabilizing... and a progress bar as the electrode stabilizes in the standard. The
display shows the value of the check standard and either Check Standard Passed or
probe Check Standard Failed.
If the display reads Check Standard Passed, the check standard measurement is
within the accepted limits defined by the administrative user. Select
DONE to proceed
with sample measurement.
If the display reads Check Standard Failed, the measurement is outside of accepted
limits defined by the administrative user and a recalibration is suggested. If the
acceptance criteria is set to Cal Expires on Failure: Yes, the display will show the
calibrate icon with a question mark until the electrode is recalibrated. Recalibrate the
electrode to correct the status indicator (
Calibration on page 3 ).
Measurement
Measurement notes
• Data is stored automatically in the data log when PRESS TO READ or INTERVAL is
selected in the Setup Measurement Mode.
• To significantly reduce the response time for reducing-type samples:
• The platinum disc must be clean and smooth.
• Immerse the platinum disc for 3-10 minutes in Reducing Solution for ORP
Electrodes prior to sample analysis.
• Rinse the electrode with sample, then measure.
Before measurement:
The electrode must have the correct service-life time stamp. Set the date and time in the meter before attaching the
probe.
The probe is factory calibrated and ready for use. For applications that require greater accuracy and precision, verify the
user calibration with check standards or perform a user calibration. Routine calibrations are required (
Calibration on page 3 ).
Make sure that the platinum electrode is clean before sample measurement ( Clean the probe on page 9 ).
If complete traceability is required, enter a sample ID and operator ID before measurement.
Refer to the troubleshooting section for measurement errors ( Troubleshooting on page 13 ).
Stir samples gently during measurement.
When deploying the rugged probe at a distance, toss the cell body with a gentle underhand throw. Swinging the probe by the
cable may cause injury to the user, will cause severe strain on the cable and will shorten the service life of the cell. Damage
under these conditions may not be covered by the product warranty.