Myron L PT4 - Manual (Page 4)

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However, you should check the calibration whenever measurements are not as expected.
For greatest accuracy, you should perform a 3-point wet pH calibration, and wet ORP
calibration with the ORP Standard Solution closest in value to the solution you will be
testing.
NOTE: If the measurement is NOT within calibration limits for any reason, “Error” will
display. Check to make sure you are using a proper Myron L Company pH Buffer or ORP
Standard Solution. If the solution is correct, clean the sensor as described in Sensor
Cleaning section on page 4. Restart calibration.
NOTE: Small bubbles trapped in the sensor may give a false calibration. After calibration
is completed, measure the pH Buffer or ORP Standard Solutions again in solution check
mode “SOL ck” (see pages 3 and 4) to verify correct calibration.
NOTE: If at any point during calibration, you do not submerge the sensor in solution
before the flashing slows, allow the PT4 to power off and start over.
NOTE: You should always calibrate with pH 7 first.
A. Calibration preparation
For maximum accuracy, fill 2 clean containers with each pH Buffer and/or ORP Standard
Solution. Arrange them in such a way that you can clearly remember which is the rinse
solution and which is the calibration standard/buffer. If you don’t have enough standard/
buffer, you can use 1 container of each standard/buffer for calibration and 1 container of
clean water for all rinsing. Always rinse the FC E sensor between standard/buffer solutions.
Ensure the FC E sensor is clean and free of debris.
B. pH Calibration using Myron L Company pH 7, 4, and 10 Buffer
Solutions.
NOTE: You should always calibrate with pH 7 first.
1. Thoroughly rinse the PT4 by submerging the sensor in pH 7 Buffer rinse solution and
swirling it around.
2. Push and release the push button to turn the PT4 on.
3. Push and hold the push button. The display will alternate between “CAL”, “FAC CAL”,
“ºCºF TEMP”, “ModE SEL”, “PAr SEL”, “SOL ck”, and “ESC”.
4. Release the button when “CAL” displays.
5. The display will alternate between “PUSHnHLD” and “CAL.
6. Push and hold the button, The display will alternate between “PH” and “ORP”.
7. Release the button when “PH” is displayed.
8. The display will indicate “CAL” and the LED will flash rapidly.
9. While the LED flashes rapidly, dip the PT4 in pH 7 Buffer Calibration Solution so that
the sensor is completely submerged.
10. While the LED flashes slowly, the pH calibration point will display along with “CAL”.
Swirl the PT4 around to remove bubbles, keeping the sensor submerged.
11. If the pH 7 calibration is successful, the display will indicate “SAVEd”, then
“PUSHCONT” will be displayed (“PUSHCONT” will NOT be displayed if only calibrated
with pH 4 or 10).
12. Push and release to continue or let the unit time out to exit after a 1-point or 2-point
calibration.
13. Repeat steps 9 through 12 with pH 4 and 10 Buffer Solutions. After the 3rd calibration
point is successfully saved, the display will indicate “SAVEd” and power off.
14. Verify calibration by retesting the calibration solution in solution check mode “SOL
ck”, see section V below.
C. ORp Calibration using Myron L Company 80mV Quinhydrone, 260mV
Quinhydrone, or 470mV MLC Light’s ORp Standard Solution.
N OTE: The PT4 has automatic temperature compensation in ORP calibration mode
(from 15ºC to 30ºC).
1. Follow pH calibration steps 1 through 6, using ORP Solutions.
2. Release the button when “ORP” is displayed.
3. The display will indicate “CAL” and the LED will flash rapidly.
4. While the LED flashes rapidly, dip the PT4 in ORP Standard Solution so that the
sensor is completely submerged.
5. While the LED flashes slowly, the ORP calibration point will display along with “CAL”.
Swirl the PT4 around to remove any air bubbles, keeping the sensor submerged.
6. If the ORP calibration is successful, the display will indicate “CAL SAVEd”, then
time out.
7. Verify calibration by retesting the calibration solution in solution check mode.
V. SOLUTION CHECK
Solution check is provided to verify the proper calibration value was recorded when
using Myron L Company pH Buffers and ORP Standard Solutions. To verify proper
calibration, simply put the PT4 into solution check mode, select the mode to verify (pH
or ORP), then dip the sensor into the pH Buffer or ORP Calibration Solution so that the
sensor is completely submerged and swirl around to release any air bubbles, then verify
displayed value matches the value on the bottle.
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Solution Check continued on page 4 ...