Standard Solutions & Buffers

STANDARD SOLUTIONS & BUFFERS

Solution MSD Sheets are available here

The following conductivity standard solutions and pH buffers are used for factory calibration.  Regular use of these solutions is recommended for greatest instrument accuracy.  Frequency of conductivity recalibration depends upon use, but once every three months should be sufficient for an instrument used daily.  pH models should be recalibrated with pH 7 buffer every 1-2 weeks, with 4 and 10 buffers every 6-8 weeks.  pH buffers and standard solutions are available in quart and gallon plastic bottles, ready to use.

Instrument Model	Recommended Standard Solutions & Buffers
3P	pH 4, 7, 10
4P	KCI-7000, 442-3000
6P	KCI-7000, 442-3000, pH 4, 7, 10
pH1	pH 4, 7, 10
AR1	KCI-1800 or 442-1500
ARH1	KCI-1800 or 442-1500, pH 4, 7, 10
512T2 (M2)	442-30
512T3 (M3)	442-300
512T4 (M4)	442-1500
512M5	442-3000
512T5	442-3000
512T10	442-3000
512M10	KCI-7000
532M1	442-30, 300, 3000
532T1	442-30, 300, 3000
532T2	442-15, 150, 1500
AG-5	442-3000
AG6/pH	442-3000, pH 4, 7, 10
D-1	14.0 Millimhos
D-2	14.0 Millimhos
DS-1	442-1000
EP	442-30, 300, 3000
EP-10	KCI-70, 700, 7000
EP11/pH	KCI-70, 700, 7000, pH 4, 7, 10
M6/pH	442-3000, pH 4, 7, 10
RO-1 (NC)	442-1000
T2/pH	442-30, 300, 3000, pH 4, 7, 10
T6/pH	442-3000, pH 4, 7, 10

Note: RE-10 Range Extenders are usually calibrated with 442-30,000 standard solutions (30,000/442; 18,235/NaCI; 30,100/microsiemens) or 442-15,000 (15,000/442; 9462/NaCI; 16,630 microsiemens)

Refer to the following for actual calibration point values:

Conductivity instruments are a convenient way to determine the parts per million of total dissolved solids (ppm/TDS) in boilers, cooling towers, reverse osmosis systems, etc. Although the International Unit (SI) of measuring conductivity is the microsiemens/cm (also known as micromhos/cm), a direct reading in ppm/TDS is sometimes preferred.

Myron L conductivity instruments and monitor/controllers are calibrated to read in ppm/442, ppm/NaCI, or microsiemens. All three values are shown on the label of our Standard Solutions. The relationship among these standards can be seen in the chart that follows.

The following shows the TDS/Conductivity Equivalents Chart for various Myron L Standard Solutions: 

Notes:

442 Natural Water™ Standard Solution is used in calibrating many Myron L Instruments. It is the best choice when measuring boiler and cooling water samples, city water supply, lakes, wells, etc. "442" refers to the combination of salts mixed with deionized water to make this standard: 40% sodium sulfate, 40% sodium bicarbonate, 20% sodium chloride. A combination of standard salts is necessary, since natural water salt type and concentration can vary greatly by location. After much research, the 442 Standard was developed by Myron L Company more than 35 years ago. It remains the world's most accepted such standard.

NaCI Standard Solution is offered to calibrate instruments which measure any sample that is predominantly NaCI (sodium chloride), such as sea water, brackish water, etc. 1000 ppm of NaCI has conductivity of 2000 micromhos. Note how this 1:2 relationship is continuously variable and decreases as ppm NaCI increases.

KCI Standard Solution is used to calibrate conductivity instruments which read directly in microsiemens (micromhos) or millisiemens (1000 microsiemens). KCI (potassium chloride) is a very stable salt and is an international calibration standard for conductivity measurement.

pH Buffer Solutions of 4, 7, and 10, are mold inhibited, and accurate to within ± 0.01 pH units @ 25°C. Myron L buffers are traceable to NIST certified pH referenced and are color-coded for instant identification.

pH Sensor Storage Solution
Model: SSQ (quart), SSG (gallon)