HyQual Multi-probes User Manual v3, 08.07.2022
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Figure 3
–
Getting access to O-Rings
Always remove batteries (if any) and clean The HyQual probe prior to storing it for prolonged periods.
Always refill the reference electrode and recalibrate after long storage periods.
7.3
Maintenance
–
1: Calibration
7.3.1
Basics of Parameter Calibration
The procedure for operating a HyQual, including making calibrations, varies with the type of Display
used because the user-interface software can be different (mostly because of the differences in Display
screen sizes). You could also study the highly detailed Appendices to familiarize yourself with the vari-
ous procedures. Otherwise, you should be able to walk through the software once you have established
communication between your Display and the HyQual probe. You can become a minor expert in just a
few minutes.
The HyQual probe never guesses parameter values, so you must calibrate it from time to time by simply
telling the instrument what it should read in a calibration situation for which the correct parameter
value is known. Here’s the general procedure:
1.
Clean the sensor and perform any necessary sensor-specific maintenance.
2.
Select a calibration standard whose value is close to the values you expect to see in the field.
For best results, use fresh calibration solutions, and discard them once they have been used.
But generally, you can reuse most calibration standards a few times if you are careful to avoid
contamination.
3.
With the HyQual probe
’s Storage/Calibration Cup screwed onto
the HyQual probe housing, rinse
the sensors three times with a small quantity of your calibration standard by pouring the stand-
ard into the Storage/Calibration Cup, positioning the “stopper” side of the lid (the side with the
O-ring) on top of the Storage/Calibration Cup, and shaking the HyQual probe vigorously to re-
move traces of old calibration solutions. Discard the used calibration standard between rinses.
4.
Next secure The HyQual probe with the sensors pointing up and fill the calibration cup with your
calibration standard. Make sure the standard covers the sensor entirely, and that it also covers
the thermistor for those parameters that are temperature-compensated. For turbidity sensors
and other fluorometers fill the cup to at least 1 ½ inches above the sensor’s lens surface.
