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STANDARD SOLUTIONS & BUFFERS
 Myron L DS, pDS, TechPro™ and ULTRAMETER™ are
factory calibrated with NIST traceable standard solutions having specific conductivity/TDS 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 megohm-cm purity. Myron L Company
Standard Solutions are accurate to within ±1.0% of potassium chloride reference solutions. These solutions are traceable to National
Institute of Standards and Technology primary solutions. The original conductivity
data for all solutions are derived from International Critical Tables Volume No. 6, pp 229-239.
Solution MSDS Sheets are available here
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Solution Pricing
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All Standard Solutions, Buffers & Storage Solutions
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$12.75 per pint or $18.75 per quart
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All Standard Solutions, Buffers & Storage Solutions
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$58.00 per gallon
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NIST Traceable Custom Conductivity/TDS Standard Solution
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$90.00 per gallon
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NIST certificate (when ordered with solution)
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$25.00
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NIST certificate (when ordered after solution is shipped)
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$45.00
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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.
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Instrument
Model
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Recommended Standard Solutions & Buffers
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3P
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pH 4, 7, 10
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4P,4PII
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KCI-7000, 442-3000
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6P,6PII
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KCI-7000, 442-3000, pH 4, 7, 10
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pH1
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pH 4, 7, 10
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AR1
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KCI-1800 or 442-1500
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ARH1
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KCI-1800 or 442-1500, pH 4, 7, 10
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512T2 (M2)
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442-30
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512T3 (M3)
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442-300
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512T4 (M4)
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442-1500
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512M5
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442-3000
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512T5
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442-3000
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512T10
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442-3000
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512M10
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KCI-7000
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532M1
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442-30, 300, 3000
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532T1
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442-30, 300, 3000
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532T2
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442-15, 150, 1500
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AG-5
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442-3000
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AG6/pH
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442-3000, pH 4, 7, 10
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D-1
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14.0 Millimhos
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D-2
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14.0 Millimhos
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DS-1
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442-1000
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EP
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442-30, 300, 3000
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EP-10
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KCI-70, 700, 7000
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EP11/pH
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KCI-70, 700, 7000, pH 4, 7, 10
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M6/pH
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442-3000, pH 4, 7, 10
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RO-1 (NC)
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442-1000
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T2/pH
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442-30, 300, 3000, pH 4, 7, 10
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T6/pH
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442-3000, pH 4, 7, 10
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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 below.
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TDS/Conductivity Equivalents Chart
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Type
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PPM
442
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PPM
NaCI
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Microsiemens
Micromhos/cm
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442-15
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15
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11.1
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23.8
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442-30
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30
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21.8
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46.7
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442-150
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150
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108.7
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229
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442-300
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300
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214.3
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445
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442-500
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500
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355.8
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731
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442-1000
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1000
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703.6
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1417
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442-1500
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1500
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1036
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2060
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442-3000
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3000
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2027
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3900
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442-15,000
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15,000/15.0 ppt
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9462/9.4 ppt
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16,630/16.6 mS
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442-30,000
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30,000/30.0 ppt
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18,235/18.2 ppt
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30,100/30.1 mS
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KCl-70
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45
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32.8
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70
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KCl-700
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