Nova-Tech pH-CON 300 - Manual (Page 7)

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4. Press CAL/MEAS to enter pH calibration
mode. The CAL indicator lights. The
primary display will show the measured
reading while the smaller secondary
display will indicate the pH standard
buffer solution.
See figure
5. Wait for the measured pH value to
stabilize. If the READY indicator has
been activated (set up program P3.1—
see page 28), the READY annunciator
lights when the reading is stable.
6. Press ENTER to confirm calibration.
The meter is now calibrated to the
current buffer. The lower display scrolls
through the remaining buffer options.
• If you are performing multipoint
calibration, go to step 7.
• If you are performing one-point
calibration, go to step 9.
7. Rinse the electrode with de-ionized
water or a rinse solution, and place it
in the next pH buffer.
8. Follow steps 5 to 8 for additional
calibration points.
9. When calibration is complete,
press CAL/MEAS to return to pH
measurement mode.
See figure
Notes
To exit from pH Calibration mode without confirming calibration, DO NOT press
ENTER in step 6. Press CAL/MEAS instead.
If the selected buffer value is not within ±1.0 pH from the measured pH value: the
electrode and buffer icon blink and the ERR annunciator appears in the lower left
corner of the display.
To limit the number of pH buffer values available during calibration, see Set-up
program P3.2 on page 29.
ATC
READY
MEAS
C
pH
C
C
READY
CAL
pH
pH
B
B
Conductivity and TDS calibration
Calibrate up to 5-point conductivity or 5 point TDS calibration at one point per range:
Range Conductivity: TDS:
R1 0.00-19.99 µS 0.00-9.99 ppm
R2 0.0-199.9 µS 10.0-99.9 ppm
R3 0-1999 µS 100-999 ppm
R4 0.00-19.99 mS 1.00-9.99 ppt
R5 0.0-199.9 mS 10.0-199.9 ppt
If you are measuring values in more than one range, make sure to calibrate each of
the ranges you are measuring. All new calibration data will over-ride existing stored
calibration data for each measuring range you calibrate.
• If you are measuring in ranges near to or greater than 20 mS (10 ppt), or near to
or lower than 100 µS (50 ppm), calibrate the meter at least once a week to get
specified ±1% F.S. accuracy.
• If you are measuring in the mid ranges and you washed the probe in deionized
water and stored it dry, calibrate the meter at least once a month.
• If you take measurements at extreme temperatures, calibrate the meter at least
once a week.
Preparing for conductivity/TDS calibration
For best results, select a standard value close to the sample value you are
measuring. Alternatively, use a calibration solution value that is approximately
2 ⁄
3
the full scale value of the measurement range you plan to use. For example,
in the 0 to 1999 µS conductivity range, use a 1413 µS solution for calibration.
See the table below for recommended calibration solution ranges:
4.3
Temperature coefficient: These meters are factory set to a temperature coefficient
of 2.1% per °C. For most applications this will provide good results. See
Program P8.1 on page 38 to set the temperature coefficient to a different value.
See Appendix 31, “Calculating Temperature Coefficients” on page 50 to determine
the appropriate temperature coefficient for your solution.
Normalization temperature: The factory default value for normalization tempera-
ture is 25°C. If you need to normalize to a value other than 25°C, see Program P8.2
on page 39.
CONTINUED ON NEXT PAGE
Conductivity Recommended TDS Recommended
Range Cal. Solution Range Range Cal. Solution Range
0.00-19.99 µS 6.00 to 17.00 µS 0.00-9.99 ppm 3.00 to 8.50 ppm
0.0-199.9 µS 60.0 to 170.0 µS 10.0-99.9 ppm 30.0 to 85.0 ppm
0-1999 µS 600 to 1700 µS 100-999 ppm 300 to 850 ppm
0.00-19.99 mS 6.00 to 17.00 mS 1.00-9.99 ppt 3.00 to 8.50 ppt
0.0-199.9 mS 60.0 to 170.0 mS 10.0-199.9 ppt 30.0 to 170 ppt
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