Myron L PH1 - Manual (Page 5)

I. INTRODUCTION
Thank you for selecting the TechPro™ Series, Model pH1, one of the
Myron L Company’s latest in a new line of digital instruments utilizing
advanced circuitry. This circuitry makes it very accurate and easy to use
(see pages 2 & 3 for Features and Specifications on this and other
models). For your convenience, on the bottom side of your pH1 is a brief
set of instructions.
II. RULES of OPERATION
Using the instrument is simple:
•
Rinse the pH sensor well with test solution 3 times.
• Refill and Press the RED pH key.
• Note the value displayed. It’s that simple!
Your pH1 is designed to provide quick, easy, accurate measurements by
simply pressing one key.
Measurements are made on solution held in the pH sensor well (ref. pH
Measuring, pg. 13). The protective cap is removed, and the sensor well is
filled and rinsed with sample enough times to completely replace the
storage solution. After use, the pH sensor well must be refilled with
Myron L Storage Solution, and the protective cap reinstalled securely
(ref. Cleaning Sensor, pg. 10).
A press of displays pH readings. No units are displayed.
III. AFTER USING the pH1
Rinse out the cell cup with clean water. Do not scrub the sensor. For oily
films, squirt in a foaming non-abrasive cleaner and rinse.
The sensor well must be kept wet with a solution. Before replacing the
rubber cap, rinse and fill the sensor well with (in order of preference):
Myron L Storage Solution, an almost saturated KCl solution, pH 4 buffer,
(ref. Buffer Solutions, pg. 13) or at least a strong table salt solution. Not
distilled water.
IV. THE SPECIFIC RECOMMENDED MEASURING
P R O C E D U R E S
1. Remove protective cap by squeezing its sides and pulling up.
2. Rinse sensor well 3 times with sample to be measured. Shake
out each sample to remove any residual liquid.
3. Refill sensor well with sample.
4. Press .
5. Take reading.
6. IMPORTANT: After use, fill pH sensor well with Myron L
Storage Solution, a strong KCl solution or pH 4 buffer, and
replace protective cap. Do not allow pH sensor to dry out.
N O T E : If a storage solution, KCl or pH 4 solution is unavailable, use a
saturated solution of table salt and water (ref. Cleaning Sensor, pg. 10).
V. CALIBRATION
A. Calibration Intervals
Depending on frequency of use and type of solutions tested, generally,
calibration is recommended about twice per month.
B. Rules for Calibration in the pH1
1. Calibration Steps
Both Zero and Gain calibrations are accomplished by Calibration Controls
located under their respective cap plugs located on the bottom of the
instrument, one for Zero, and one for Gain.
After pressing the pH key, the reading is changed/adjusted to match the
known buffer value.
2. Calibration Limits
In pH, the inability to calibrate may indicate improper or contaminated
buffer solution or a damaged pH Sensor.
C. Calibration Procedures
IMPORTANT: Always “zero” your pH1 with a pH 7 buffer solution
before adjusting the gain with acid or base buffers, i.e. 4 and/or 10, etc.
1. pH Zero Calibration
1. Remove protective cap.
2. Rinse sensor well 3 times with 7 buffer solution.
3. Refill sensor well with 7 buffer solution.
6 7
pH
In the first four sections, you have learned all
you need to make accurate measurements.
The following sections contain calibration and
technical information.
pH