Aquaprobe
®
AP-700, AP-800 & AP-2000 Instruction Manual
10401-00870 Rev R
The Calibration Report on the top line displays the EC Cell Constant. This value is stored in
the Probe's memory and can be recalled at any time. See section
10.7 Calibration Data
Storage and Retrieval
. Press OK then ESC repeatedly to return to normal reading mode.
Special Notes:
If you have selected a Calibration Standard value other than R-CAL, then you
subsequently use the RapidCal calibration technique described in section 10,
the Calibration Standard value will automatically be reset to R-CAL.
The Calibration Standard value is stored in the Probe,
not
the Meter. If you
use one Meter with several different Probes, you will have to set the
Calibration Standard value for each probe individually during calibration.
If you select a Calibration Standard value but do not press
OK
, the
information will not be sent to the Probe and the change will not be registered.
15.1. Verifying EC Calibration
Due to the fact that debris and air bubbles can adversely affect EC calibration, it is
advisable to verify calibration has been properly achieved. To do this, follow item ten above
with this procedure.
1.
Remove the probe from the calibration bottle, shake it off, then reinsert.
2.
Press the
ESC
key repeatedly to get back to the Main Menu.
3.
Go into settings and make sure EC is set to read with reference to 25ºC. If it’s
not, set it that way. See section 9.1
Setting Units of Measurement
.
4.
Go back to the main screen, wait until the temperature and EC readings are
stable, then check that the EC is r/- 1% of the Calibration Standard
value.
5.
If the EC reading is outside the 1% limit, recalibrate, this time leaving more
time for stabilisation.
If you can not successfully verify the EC calibration after several attempts, replace the
Calibration Standard. If the problem persists, strip the probe down as described below and
thoroughly clean the EC contacts.
15.2. Errors During Calibration
At the beginning of the calibration routine, a sanity check is done. If the probe detects that
the Calibration Standard value set and the Calibration Standard being used differ, the 'OUT
OF CAL RANGE' error will be reported. If any other problems occur during calibration, an
error message will be displayed. Refer to
Calibration Error Messages
in section 10.4 for
error message handling.
15.3. Cleaning the EC Contacts
On a regular basis, thoroughly clean the four stainless steel EC contacts situated on the
side of the DO/EC electrode with a soft cloth or toothbrush and non-abrasive detergent.
Never use solvent or alcohol based products to clean the DO/EC electrode
. After
cleaning, replace the Probe sleeve and re-calibrate.
15.4. Calibrating Temperature
The Aquaprobe's temperature sensor is built into the oval resin pocket located on the back
of the EC sensor. The temperature sensor is extremely linear and by default is set up to
read /- 0.5°C of the true temperature, which is ample for most applications.
© 2017 Aquaread
®
Ltd.
www.aquaread.com
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