OPERATING INSTRUCTIONS
pH Calibration
1.
Calibrate the meter and electrode before each use to ensure accuracy.
2.
Connect the pH electrode via the BNC connector to the meter.
3.
Open the meter to the fully extended position. Open the battery cover and install a 9V
battery. Replace the cover and turn the unit ON. The LCD indication should appear.
4.
Slide the SELECT switch to pH
5.
Adjust the TEMP
o
C knob to approximate the solution temperature.
6.
Remove the wetting cap from the tip of the electrode. Rinse in de-ionized water, blot
dry and place the electrode in a 7.00 pH buffer solution. Allow to stand for
approximately one minute or until the display stabilizes.
7.
Adjust the CALIB knob until the display reads 7.00.
8.
Remove the electrode from the buffer and rinse it in distilled water and blot dry. Place
the electrode in a 4 or 10 pH buffer solution and allow to stand for approximately 1
minute or until the display stabilizes.
9.
Adjust the SLOPE knob until the display reads 4.00 or 10.00 (as required).
10. Repeat steps 6 through 9 until no further adjustment is necessary.
pH Measurement
1.
Place the electrode in the sample solution and read the pH value on the LCD.
2.
When all measurements have been taken, unplug the electrode or cell and rinse in
distilled water, shake and store as described below.
Conductivity / TDS Calibration
The conductivity cell calibration should be performed frequently to ensure accuracy.
1.
Connect the conductivity cell to the input socket on the side of the meter.
2.
Prepare a conductivity solution of approximately the same value as the solution to be
measured. The solution should be prepared at 25
0
C.
3.
Set the meter to the uS/cm or TDS mode.
4.
Place the cell in calibration solution and allow the reading to stabilize.
5.
Adjust the Cell knob until the display reads the value of the calibration solution.
Example:
For a 12560uS/cm conductivity solution the display will read 1256. The
user must multiply the reading x 10.
Conductivity/TDS Measurements (Multiply readings by 10)
1.
Place the electrode in the sample solution.
2.
When finished, unplug the electrode or cell and rinse in distilled water.
Temperature Measurement
(34145-A only)
1.
Set the mode switch to Temperature.
2.
Connect the temperature probe to the meter via the meter’s phone jack.
3.
The LCD will indicate the temperature in
o
C.
4.
Immerse the probe at least 1/3 of the way below the surface of the solution.
5.
Allow enough time for the electrode to reach the sample’s temperature.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
