Hach-Lange HQD - Conductivity probe CDC - Manual (Page 5)

DOC272.53.80022 5
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 Check Standards Options menu.
Access control must be off or a valid password must be entered before any of the check
standard method options can be changed.
1. Select Run Check Standard from the Meter Options menu.
2. Obtain the conductivity standard solution specified on the display.
3. Rinse the probe and Put it in the standard solution until the temperature sensor is
completely submerged. Move the probe up or down or gently tap on the beaker to
remove air bubbles from the electrode.
4. Select Read. The display shows the value of the check standard and either Check
Standard Passed or Check Standard Failed.
If the display shows Check Standard Passed, select Done to proceed with sample
measurement.
If the display shows 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
calibration icon and a question mark until the probe is recalibrated. To correct the probe
calibration and status indicator, calibrate the probe (
Calibration on page 2 ).
Maintenance
Storage
Between uses, make sure the probe is dry and store it in ambient conditions. Rugged
probes may be stored with the shroud installed if the storage container is sufficiently large.
Rugged probe maintenance
The shroud protects the sensor elements during rugged applications. Damage to the
sensing elements can occur if the shroud is not installed during field use. Damage under
these conditions is not covered under warranty. Before a rugged probe can be cleaned,
the shroud must be removed. Install the shroud after the probe is clean.
To remove the shroud:
1. Loosen and remove the locking ring.
2. Slide the shroud and locking ring off the electrode.
To install the shroud:
1. Put the locking ring on the electrode with the threads toward the glass bulb.
2. Slide the shroud on the electrode until it is against the locking groove.
3. Hand-tighten the locking ring on the shroud.