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76
GF 9950-10 Six Channel Transmitter
Conductivity units are
displayed as selected in
the CALIBRATE menu.
Resistivity displayed
when K
Ω
or M
Ω
ranges
are selected.
AutoCal Procedure
AutoCal
is a single-point calibration system. During this procedure, if the measured
value is within ± 10% of any of the test values listed below, the 9950 will automatically
recognize the test value and calibrate the output to that value.
NOTE:
The
fi
rst step (Reset) is recommended each time an electrode is replaced, but is
NOT necessary upon initial installation or periodic calibration.
NOTE:
Ensure that the buffer solution is within ± 5 °C of 25 °C.
1. Reset the sensor to factory calibration. (refer to sensor manual for procedure)
2. On the 9950, select AUTO CAL from the CAL menu. Press
►
.
3. Place the electrode/sensor assembly into the conductivity test solution appropriate
to your operating range. Shake the electrode to dislodge any air bubbles visible on
the surface of the electrode.
4. Allow at least 2 minutes for the electrode response to stabilize.
5. When the display stabilizes, press ENTER.
6. If calibration is successful, 9950 will display "SAVING". If error is too large,
"OUT OF RANGE USE MANUAL CALIBRATION" will display.
Calibration is complete. Return the system to service.
Calibration Procedure - Conductivity/Resistivity
AutoCal is the fastest and simplest periodic calibration method.
Requires prepared buffer of a value appropriate to your process.
Available buffer values are:
●
10
●
100
●
146.93
●
200
●
500
●
1000
●
1408.8
●
5000
●
10,000
●
12856
●
50,000
●
100,000
(all values in
μ
S)
Manual Cal Procedure
NOTE:
The
fi
rst step (Reset) is recommended each time an electrode is replaced,
but is NOT necessary upon initial installation or periodic calibration.
NOTE:
Ensure that the buffer solution is within ± 5 °C of 25 °C.
1. Reset the sensor to factory calibration. (refer to sensor manual for procedure)
2. On the 9950, select MANUAL CAL from the CAL menu. Press
►
.
3. Place the electrode/sensor assembly into the conductivity test solution appropriate
to your operating range. Shake the electrode to dislodge any air bubbles visible on
the surface of the electrode.
4. Allow at least 2 minutes for the electrode response to stabilize.
5. When the display stabilizes, press the
►
key, and enter the value of the buffer
solution using the
▼
,
▲
and
►
buttons.
6. Press
ENTER.
7. 9950 will display "SAVING". If error is too large, "ERR TOO LARGE TO
CALIBRATE" will display.
Calibration is complete. Return the system to service.
Calibration Procedures - Conductivity / Resistivity
Refer to page 77 to
troubleshoot Calibration Errors
WARNING:
Calibration
standards are very unstable
below 50
μ
S. For resistivity
applications it is recommended
to use a NIST sensor and enter
the sensor data into the Custom
Cell menu feature.