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Standard Solutions and Buffers

Source: Myron L Company

Standard Solutions and Buffers
All Myron L handheld instruments are factory calibrated with NIST traceable Standard Solutions having specific conductivity/ppm values. Myron L Company Standard Solutions are made under strictly controlled conditions using reagent grade salts. These salts are mixed with deionized water having a resistivity of at least 5 megohms-cm purity
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Application Bulletin: Standard Solutions and Buffers

All Myron L handheld instruments are factory calibrated with NIST traceable Standard Solutions having specific conductivity/ppm values. Myron L Company Standard Solutions are made under strictly controlled conditions using reagent grade salts. These salts are mixed with deionized water having a resistivity of at least 5 megohms-cm purity.

Myron L Company Standard Solutions have an accuracy of /-1% based on values published in the International Critical Tables and traceable to the National Institute of Standards and Technology.

The conductivity Standard Solutions and pH Buffers listed below are used for factory calibration. Regular use of these solutions is recommended to ensure specified instrument accuracy. Frequency of conductivity recalibration depends upon use, but once every month should be sufficient for an instrument used daily. pH models, depending upon use, should be recalibrated with pH 7 Buffer every 1-2 weeks, and checked with pH 4 and/or 10 Buffers at similar intervals. pH Sensor Storage Solution is recommended for keeping the pH sensor wet. Myron L solutions are available in quart / 1 ltr., gallon / 3.8 ltr. and 2 oz. / 59 ml plastic bottles, ready to use. (Custom value standards only offered in gallon / 3.8 ltr. size bottles.)

Instrument Model

Recommended Standards / Buffers

3P 4, 7 and 10 pH Buffers
4P & 4PII KCI-7000, 442-3000, NaCl-14.0
6P & 6PII KCI-7000, 442-3000, NaCl-14.0,
4, 7 and 10 pH Buffers
PH1 4, 7 and 10 pH Buffers
AR1 / TP1 KCI-1800, 442-1500
ARH1 / TPH1 KCI-1800, 442-1500, 4, 7 and 10 pH Buffers
512T2 (M2) 442-30
512T3 (M3) 442-300
512T4 (M4) 442-1500
512T5 (M5) 442-3000
512T5D (PoolMeter™) 442-3000
512T10 (M10) 442-3000, KCl-7000
532M1 442-30, 300, 3000
532T1 442-30, 300, 3000
532T2 442-15, 150, 1500
AG-5 (AgriMeter™) 442-3000
AG6/PH (AgriMeter™) 442-3000, 4, 7 and 10 pH Buffers
D-1 (Dialysate Meter™) Nacl 14.0 Millimhos
D-2 (Dialysate Meter™) NaCl 14.0 Millimhos
DS-1 442-1000
EP 442-30, 300, 3000
EP-10 KCI-70, 700, 7000
EP11/PH KCI-70, 700, 7000, 4, 7 and 10 pH Buffers
M6/PH 442-3000, 4, 7 and 10 pH Buffers
RO-1 (NC) 442-1000
T2/PH 442-30, 300, 3000, 4, 7 and 10 pH Buffers
T6/PH 442-3000, 4, 7 and 10 pH Buffers

Note: Refer to TDS/Conductivity Equivalents chart for actual calibration point values.

Note: RE-10 Range Extenders are usually calibrated with either 442-15,000 or 442-30,000 Standard Solution.

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 (Sl) 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 listed on our Standard Solutions. The relationship among these standards can be seen in the table below.

TDS/Conductivity Equivalents Chart

Type PPM
442™
PPM
NaCI
KCl
Microsiemens
(Micromhos)/cm
442-15 15 11.1 23.8
442-30 30 21.8 46.7
442-150 150 108.7 229
442-300 300 214.3 445
442-500 500 355.8 731
442-1000 1000 703.6 1417
442-1500 1500 1036 2060
442-3000 3000 2027 3900
442-15,000 15,000 / 15.0 ppt 9462 / 9.46 ppt 16,630 / 16.63 mS
442-30,000 30,000 / 30.0 ppt 18,235 / 18.24 ppt 30,100 / 30.1 mS
KCl-70 45 32.8 70
KCl-700 478 340.2 700
KCl-7000 5687 3740 7000
KCl-70,000 84,983 / 84.98 ppt 47,999 / 48 ppt 70,000 / 70 mS
KCl-18 * 11.4 8.4 18
KCl-180 116.5 85.2 180
KCl-1800 1294 901.6 1800
KCl-18,000 16,462 / 16.46 ppt 10,289 / 10.29 ppt 18,000 / 18 mS
NaCI-12.5 10,870 / 10.87 ppt 6955.7 12,500 / 12.5 mS
NaCI-13.4 11,767 / 11.77 ppt 7501.1 13,400 / 13.4 mS
NaCI-14.0 12,370 / 12.37 ppt 7864.7 14,000 / 14.0 mS

Notes:

  1. 442™ Standard Solution is the trademark for the Myron L Company Natural Water Standard.
  2. All values cross-referenced @ 25°C.
  3. Custom valued Conductivity / TDS Standard Solutions may be special ordered.
  4. * Because of environmental factors, accuracy of this solution cannot be guaranteed to destination.
  5. Solutions will freeze @ 0ºC / 32ºF

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 comprise 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 the Myron L Company more than 40 years ago. It remains the world's most accepted standard.

NaCl Standard Solution is offered to calibrate instruments that measure any sample that is predominately NaCI (sodium chloride), such as sea water, brackish water, etc. As can be seen in the graph at right, 1000 ppm of NaCI has a conductivity of 2000 micromhos. Note how this 1:2 relationship is continuously variable throughout the curve and decreases as ppm NaCI increases.

KCl Standard Solution is used to calibrate conductivity instruments that 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 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 references and are color-coded for instant identification.

Click Here To Download:
Application Bulletin: Standard Solutions and Buffers

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