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.
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 |
Recommended Standard Solution & Buffers |
|
4P |
KCI-7000,
442-3000 |
|
6P |
KCI-7000,442-3000, pH 4, 7, 10,
Storage solution |
|
pH1 |
pH 4, 7,
10, Storage solution |
|
AR1 |
KCI-1800
or 442-1500 |
|
ARH1 |
pH 4, 7,
10, Storage solution |
|
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, Storage solution |
|
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, pH 4, 7, 10,
Storage solution |
|
EP11/pH |
KCI-70,
700, 7000, pH 4, 7, 10,
Storage solution |
|
M6/pH |
442-3000,
pH 4, 7, 10, Storage solution |
|
RO-1 (NC) |
442-1000 |
|
T2/pH |
442-30,
300, 3000, pH 4, 7, 10,
Storage solution |
|
T6/pH |
442-3000,
pH 4, 7, 10, Storage solution |
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.
|
TDS/Conductivity Equivalent
Chart |
| Type |
PPM
442™ |
PPM
NaCl |
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 |
9462/9.4 ppt |
16,630/16.6 mS |
| 442-30,000 |
30,000/30.0 ppt |
18,235/18.0 ppt |
30,100/30.1 mS |
| KCI-70 |
45 |
32.8 |
70 |
| KCI-700 |
478 |
340.2 |
700 |
| KCI-7000 |
5687 |
3740 |
7000 |
| KCI-70,000 |
84,983 |
47,999 |
70,000 (70.00 mS) |
| KCI-18* |
11.4 |
8.4 |
18 |
| KCI-180 |
116.5 |
85.2 |
180 |
| KCI-1800 |
1294 |
901.6 |
1800 |
| KCI-18,000 |
16,462/16.4 ppt |
10,289/10.3 ppt |
18,000/18 mS |
| NaCl-12.5 |
10,870.10.8 ppt |
6955.7 |
12,500/12.5 mS |
| NaCl-13.4 |
11,767/11.7 ppt |
7501.1 |
13,400/13.4 mS |
| NaCl-14.00 |
12,370/12.3 ppt |
7864.7 |
14,000/14.0 mS |
Notes:
1.442 Natural Water Standard™ is a trademark of the Myron L Company
originating in 1964.
2.All values are cross-referenced @ 25°C.
3.* Because of environmental factors, accuracy of this solution cannot be
guaranteed to destination.
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 in 1964. It remains the
world's most accepted such standard.
NaCl 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 NaCl 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: SS2OZ (2 ounce bottle), SSQ (quart), SSG (gallon)
Click For Material Safety Data Sheets |
