4
5
IV. Calibration
The PT1 is designed to be very reliable and requires only infrequent
calibration. The Myron L Company recommends calibrating each
measurement mode you use once monthly. However, you should
check the calibration whenever measurements are not as expected.
The PT1 is programmed for 2 calibration options: Wet Calibration
or Factory Calibration. Wet calibration is most accurate. But if a
high quality standard KCl-1800 µS or 442-3000 ppm solution is not
available, the PT1 can be returned to factory settings.
A. Wet Calibration
Use calibration solution specified for measurement mode: Use KCL-
1800 for Cond
KCl
; Use 442-3000 for tdS
442
, SALt
442
, tdS
NaCl
,
and SALt
NaCl.
See Specifications table for 442 solution ppm NaCl
equivalent value. Calibrating tdS simultaneously calibrates SALt for
the same value and vice versa.
1. Pour Myron L Company calibration solution into a clean container.
2. Rinse the pen 3 times by submerging the cell in fresh calibration
solution and swirling it around.
3. Remove pen from solution, then fill the container one more time.
4. Press and release the push button. The LCD will briefly display the
firmware version then the current measurement mode. Ensure the
PT1 is in the correct solution mode.
5. Immediately push and hold the push button. The display will scroll
through “CAL”, “SOL
SEL
”, “FAC
CAL
”, “ºCºF
T
EMP
”, and “ESC”. Release
the button when “CAL” displays.
6. Grasp the pen by its case with your fingers positioned between the
display and the pen cap to avoid sample contamination.
7. While the LED flashes rapidly, dip the pen in calibration solution so that the
cell is completely submerged. If you do not submerge the cell in solution
before the flashing slows, allow the pen to power off and start over.
8. While the LED flashes slowly, swirl the pen around to remove
bubbles, keeping the cell submerged. Keep pen at least 1 inch
(2½ cm) away from sides/bottom of container.
9. When the LED light stays on solid, remove the pen from the solution.
“CAL SAVED” will display indicating a successful calibration.
Note:
If an incorrect solution is used or the measurement is NOT
within calibration limits for any other reason, “Error” displays alternately
with “CLEAn
CEL
/CHEC
SOL”
. Check to make sure you are using the
correct calibration solution. If the solution is correct, clean the cell by
submerging the cell in a 1:1 solution of Lime-A-Way® and water for 5
minutes. Rinse the cell and start over.
10. Small bubbles trapped in the cell can give a false calibration. Measure
the calibration solution again to verify correct calibration. If the reading
is not within ±1% of the calibration solution value, repeat calibration.
B. Factory Calibration
If you do not have the proper calibration solution or wish to restore the
pen to its original factory settings for any other reason, use the FAC
CAL
function to calibrate the PT1.
1. Press and release the push button. The LCD will briefly display the
firmware version then the current measurement mode.
2. Immediately push and hold the push button. The display will scroll
through “CAL”, “SOL
SEL
”, “FAC
CAL
”, “ºCºF
T
EMP
”, and “ESC”. Release
the button when “FAC
CAL
” displays.
3. While the display scrolls through “PUSHn
HLD
” and “FAC
CAL
”, push
and hold the push button until the display scrolls through “SAVEd” and
“FAC
CAL
”, indicating the pen has been reset to its factory calibration.
4. Allow the pen to time out to turn power off.
MyroN L CoMpANy
2450 Impala Drive
Carlsbad, Ca 92010-7226
Phone: +1-760-438-2021
Customer Service E-Mail: [email protected]
Technical Support E-Mail: [email protected]
Website:
www.myronl.com
MAde IN U.S.A.
