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6.1 Verification
A verification does not change anything on the calibration values and is used as
a measure to check if a calibration needs to be performed or not. Generally, a
salt standard with a value which is within the normal measurement range is used
for verification. Technically, it is not necessary to perform a verification before a
calibration is executed.
An (automatic) verification can be performed only if a verification tolerance
(aw or %rh) has been entered in „Chamber Settings“ -> „Sensor calibration“ ->
„Verification tolerance“. Please refer to internal guidelines and/or SOP (standard
operating procedures) to find out if your company has a certain verification tole-
rance in place. If not, a value of +/-0.005aw is best practice. If verification is out
of tolerance, a calibration will be recommended.
As per default (from factory), any verification tolerance is programmed
6.1.1 Performing a verification
•
Please make sure you have entered a verification tolerance in submenu
„Chamber Settings“ -> „Sensor calibration“ -> „Verification tolerance“
• Ta
ke the respective salt standard you have identified as the most appropriate
one for the verification. Place the salt on the RFID reader in the measure-
ment chamber (indicated with RFID symbol) until you hear a short beep,
then move the standard to the measurement position and close the measu-
rement chamber.
•
A pop-up window as below is displayed:
It contains info about the used salt standards as theoretical value at 25°C,
serial number, last usage and number of use.
•
Please select „VERIFY“ to start verification process. If you have not closed the
measurement chamber yet, a respective message appears.
•
The verification process is performed automatically and can take between 16
to 60 mins. During this process, „Verify“ is displayed in the start/stop button.
To abort the process at any time, simply press start/stop button.
•
Once finished, stable beep is issued as an accoustic signal and a window
containing the following information appears:
- Calibration recommended (sensor verification -> CAL.RECOMMENDED)
or Calibration not necessary (Sensor verification -> OK)
- Target value, related to 25°C
- Sensor Health (more info see chapter 6.3. Sensor Health)
- Deviation from the actual reference value and if applicable, by how far
tolerance has been exceeded plus the allowed tolerance
- If user management permission allows, a query is displayed if a calibrati-
on should be directly executed at that point or not
- If yes, a second query appears, if all calibration values should be deleted
or not. Only delete all values if you plan to perform a full span calibration
Note: If instrument was logged-off during release of verification result, you can
still start calibration at that point once you have logged-in by going to „Chamber
Settings“ -> „Sensor calibration“ -> „Retrigger sensor calibration“
