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Conductivity & ResistivityGeneral Information

Conductivity is often used as an indication of water purity. This is based on the fact that pure water will usually have very few ions present. Ions will conduct. Low ionic content = low conductivity. Note that conductivity is NOT a quantitative measurement of any or all impurities. Specifically, conductivity does not reflect the quantity of bacteria, pyrogens, or non-ionized solids present. For example, measure the conductivity of 100 ml of deionized or distilled water. Then add one gram of glucose and remeasure. What happened? If everything was clean, the conductivity stayed about the same, and the TDS is 10,000 mg/l! The same will hold true if bacteria were added. Therefore, a low conductivity DOES NOT GUARANTEE good water, but a high conductivity pretty much assures that you will have problems.

NOTE: All meters in this section also read temperature

Resistivity Conductivity

18 Megohms 0.055 micromhos

10 Megohms 0.1 micromhos

1 Megohm 1 micromho

0.5 Megohms 2 micromhos

0.1 Megohms 10 micromhos

Now, we come to TDS (Total dissolved solids). No conductivity meter we know of is capable of measuring TDS. They all apply a factor to convert the conductivity that they measure to calculate a number they call TDS. In most cases, TDS is expressed as “mg/l as KCl”. This is how it is expressed in Standard Methods. However, a few meters express TDS as “mg/l as NaCl”, or even some other terms. Be careful about this. If you are using your conductivity meter to determine TDS, you MUST know in what terms your meter expresses TDS, or you WILL get the wrong answer. You will also need to use the same type of standards to check your meter. All NCL conductivity standards are made according to Standard Methods, using KCl traceable to NIST.

Specific conductance takes the cell path into consideration, and one cm is used as a standard path length. The terms “microsiemens/cm” and “millisiemens/cm” are used. 1 microsiemen = 1 micromho/cm 1 millisiemen = 1 millimho/cm

The following chart gives some additional conversions:

Resistivity is the inverse of conductivity.Pure water has a LOW conductivity, and therefore, a HIGH resistivity.

Resistivity is measured in ohms. For lab pure water, the typical resistivity is in the Megohm range (1 Megohm = 1,000,000 ohms).

Conductivity is measured in mho(s) which is ohm(s) spelled backwards. micromhos (expressed as µmhos): 1 micromho = 0.000001 mhos millimhos (expressed as mmhos): 1 millimho = 0.001 mhos = 1000 micromhos

If you do the math, you will see that 1 Megohm = 1 micromho

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Conductivity 0.00 to 3000 mS/cm

Resistivity 2 Ohms to 100 Megohms

Salinity 0.01 to 80.0 ppt NaCl equivalent

TDS 0 to 200 ppt

Reference Temperature 5°, 10°, 15°, 20°, 25°C

Temperature –5 to 105°C

ORION® STAR A212 BENCHTOP CONDUCTIVITY METER✭ Reads out conductivity, resistivity, salinity, TDS, and temperature

✭ Bright LCD display with ready indication

✭ Automatic or manual temperature compensation

✭ Input: 8-pin mini-DIN; Output: RS232, USB

✭ Accepts either 4-electrode or 2-electrode cells

✭ IP54 dust-proof and splash-proof

✭ 2000-point datalogger download-able to printer or computer

✭ Three-year replacement warranty

✭ AC adapter included* *Can also be operated with four AA batteries (not included)

ORION® STAR A212 Benchtop Conductivity Meter/Accessories NCL # Price

Meter and electrode holder CA-1114 1003.50

Basic Conductivity Kit: meter, electrode holder, conductivity cell, one pack 5 x 60 ml of 1413 µS/cm conductivity standard CA-1114A 1251.00

Ultrapure Water Conductivity Kit: meter, electrode holder, conductivity cell with 1.5 m (4.5 ft.) cable, one pack 5 x 60 ml of 1413 µS/cm conductivity standard CA-1114B 1297.80

Conductivity cell, 4-electrode with 1.5 m (4.5 ft.) cable CO-305 512.05

®Orion is a registered trademark of Thermo Orion Scientific

CONDUCTIVITY BENCH


ORION® STAR A222 PORTABLE CONDUCTIVITY METER✭ Reads out conductivity, resistivity, salinity, TDS, and temperature



✭ Input: 8-pin mini-DIN; Output: RS232, USB

✭ Accepts either 4-electrode or 2-electrode cells

✭ IP54 dust-proof and splash-proof

✭ 1000-point datalogger down-loadable to printer or computer


✭ Operates with four AA batteries (included)* *Optional AC adapter available

Conductivity 0.00 to 3000 mS/cm



TDS 0 to 200 ppt

Reference Temperature 15°, 20° or 25°C (default), autoranging


ORION® STAR A222 Portable Conductivity Meter/Accessories NCL # Price

Meter only CA-1214 725.40

Basic Conductivity Kit: meter, conductivity probe, packets of standard and rinse solution, hard carrying case CA-1214A 1142.10

Optional AC adapter for above OA-103 66.80

Hard carrying case for Orion® STAR Portable Meter Series HC-222 138.00

Soft carrying case for Orion® STAR Portable Meter Series SC-333 142.50

Rubber meter boot for Orion® STAR Portable Meter Series RMB-444 104.00

YSI PRO30 PORTABLE CONDUCTIVITY METERUpgraded version of the Model 30. Completely waterproof. Rugged 4-electrode conductivity sensor is built into the cable. Cable lengths from 1-30 meters (3-90 ft.). 3-year meter warranty. 2-year cable and sensor warranty. YSI-30P 551.00/ea (meter only)

Cable for Pro30

1 m 4 m 10 m 20 m 30 m

YC-30-1308.75

YC-30-4318.25

YC-30-10375.25

YC-30-20418.00

YC-30-30522.50

CONDUCTIVITY PORTABLE


POCKET TESTER FOR LAB-PURE WATER, 0 - 2.000 ΜMHOS/CMUPW is the first pure water tester to measure in 1/1000th of a microsiemen. If you use deionized or distilled water, UPW offers the only inexpensive method to check their quality. Features a fast readout on a large LCD display.CH-815 125.00/ea

ECONOMY CONDUCTIVITY METER, MYRON L, MODEL EP Portable meter, featuring analog readout in micromhos/cm in the following five ranges: 0 to 0.5, 0 to 5, 0 to 50, 0 to 500, and 0 to 5000. Includes built-in conductivity cell. Recommended for determining the purity of distilled and deionized water. Battery operated, with push-button operation so that meter cannot be left on.CM-300 395.00/ea

CARRYING CASE FOR MYRON L CONDUCTIVITY METERSCM-301 56.00/ea

Specifications

Range 0.000 to 1.999 µS/cm

Resolution 0.001 µS/cm

Accuracy (@20°C/68°F) ±2% Full Scale

Typical EMC Deviation ±0.5% Full Scale

Battery Type/Life 4 x 1/4V / 120 hours approx.

Environment 0 to 50°C (32 to 122°F); RH 95%

Dimensions 7 7/8” x 15/8” x 3/4”

Weight 122 g (4.3 oz.)

POCKET CONDUCTIVITY/TDS TESTER, MID-RANGEMid-range (up to 3999 µS) version of the above also reads TDS and temperature. Features automatic 1-point calibration. Accuracy is ± 2%. Includes replaceable graphite electrode, adjustable TDS ratio, temperature in °C or °F, automatic temperature compensation, stability indicator, and automatic shut- off in a waterproof case. Supplied with protective cap, batteries, probe removal tool, and instructions.CH-983 99.00/ea

Conductivity Range 0 - 3999 µS/cm x 1 µS/cm

TDS Range 0 - 2000 ppm x 1 ppm

Temperature Range 0.0 - 60.0°C/32 - 140°F x 1°C/1°F

TDS Conversion Factor Adjustable from 0.45 to 1.00

Dimensions 63/8” x 15/8” x 1”

Weight 100 g (3.5 oz.)

Specifications



Description NCL # Price/ea

Meter only YSI-30 139.65

Replacement conductivity electrode YSI-114 46.00

YSI EcoSense® CONDUCTIVITY/TEMPERATURE METERThe EcoSense® EC300A simultaneously measures conductivity, specific conductance, salinity, TDS, and temperature with the following features:• IP67 waterproof housing• Automatic temperature compensation• 500 hour battery life• Super-stable, four-electrode conductivity cell• 50 data set memory• 1-year instrument warranty

YSI-300 (meter only) 289.75/ea

Range Resolution Accuracy

Temp. -10 to +90°C 0.1°C ± 0.2°C

Cond. *Please call for detailed specifications.

Salinity 0.0 to 70.0 ppt 0.1 ppt ± 0.2% FS

Description NCL # Price/ea

4 m (12 ft.) probe & cable assembly YSI-304 251.75

10 m (30 ft.) probe & cable assembly YSI-310 266.00

Range Resolution Accuracy

Temp. 0.0 to 99.5°C 0.5°C ± 0.5°C

Cond. 0 to 1990 µS/2.00 to 19.90 mS 5 µS/0.05 mS ± 1% FS

TDS 0 to 10,000 mg/l 5 mg/l ± 1% FS

YSI EcoSense® CONDUCTIVITY/TEMPERATURE PENThe EcoSense® EC30A measures conductivity, TDS, and temperature with an easy, user-replaceable electrode ensuring the instrument is always ready.

Features:• IP67 waterproof housing• Graphic display with on-screen instructions• 200 hour battery life• 50-set memory• 1-year meter warranty; 6-month electrode warranty




DIGITAL CONDUCTIVITY, RESISTIVITY, TDS AND TEMPERATURE PORTABLE METER

Conductivity: 0-9999 μS/cm; 10-200 mS/cm in 5 autorangesResolution: 0.01 (<100 μS) to 0.1 mS (>100 mS) in 5 ranges

Accuracy: ± 1% of reading

Resistivity: 10 KΩ - 30 MΩResolution: 0.01(<100 KΩ); 0.1 (<1000 KΩ); 0.1 (>1 MΩ)Accuracy: ± 1% of reading

TDS: 0-9999 ppm to 10-200 ppt in 5 autorangesResolution: 0.01 (<100 ppm) to 0.1 (<200 ppt) in 5 rangesAccuracy: ± 1% of readingAdjustable Cond/TDS ratio: 0.20 - 7.99

Temperature: 0-71°C (32-160°F)Resolution: 0.1°C or °FAccuracy: ± 0.1°C

CM-4P 795.00/ea

Above meter with factory-installed Bluetooth softwareCM-5P 995.00/ea

Soft carrying case for either of the above metersCM-22 45.00/ea

NEW


Conductivity(µmhos/cm) NCL # Size Price/ea

14.9 C-37G500 ml 14.85liter 22.30

73.9 C-37H500 ml 14.85liter 22.30

147 C-37J500 ml 14.85liter 22.30

718 C-37K500 ml 14.85liter 22.30

1000 C-37R500 ml 14.85liter 22.30

1413 C-37L500 ml 14.85liter 22.30

2767 C-37M500 ml 14.85liter 22.30

6668 C-37P500 ml 14.85liter 22.30

12900 C-37Q500 ml 14.85liter 22.30

NCL CONDUCTIVITY STANDARDS NCL conductivity standards are of the highest quality and are

traceable to NIST reference materials.

Micromhos NCL # Price/pk

10 CC-175 34.70

100 CC-176 34.70

1413 CC-174 34.70

10,000 CC-178 34.70

SINGLE-USE CONDUCTIVITY CALIBRATION STANDARDS

Extra-large opening (13/4” diameter) accommodates virtually all conductivity probes. The solution is compatible with all conductivity meters and probes. Supplied as a pack of 6 x 100 ml standards traceable to NIST.

CONDUCTIVITY STANDARDS


Upgraded version of the Model 85. Completely waterproof. Rugged 4-electrode conductivity sensor is built into the cable. Choose polarographic or galvanic sensor. Cable lengths from 1-30 meters (3-90 ft.). 3-year meter warranty. 2-year cable warranty. YSI-2030 726.75/ea (meter only)

Cable for Pro2030

1 m 4 m 10 m 20 m 30 m

YC-2030-1593.75

YC-2030-4608.00

YC-2030-10655.50

YC-2030-20707.75

YC-2030-30802.75

DISSOLVED OXYGEN SENSOR TYPE POLAROGRAPHIC OR GALVANIC Range: 0 to 50 mg/lAccuracy: 0 to 20 mg/l (± 2% of the reading or 0.2 mg/l, whichever is greater) 20 to 50 mg/l (± 6% of the reading)Resolution: 0.1 or 0.01 mg/l (user selectable); 0.1% air saturationCalibration: 1 point and zeroGalvanic DO YP-5202 175.75Polarographic DO YP-5203 175.75

YSI PRO2030 PORTABLE DO/CONDUCTIVITY METER

CONDUCTIVITY + DO PORTABLE


pH

Range 0.0 to 14

Resolution 0.1/0.01/0.001

Relative Accuracy ± 0.002

ORION® STAR A215 BENCHTOP pH/CONDUCTIVITY METER✭ Reads out conductivity, resistivity, salinity, TDS, pH, and temperature



✭ Accepts either 4-electrode or 2-electrode cells (conductivity)

✭ pH calibration: accepts from 1 to 5 points with either automatic or manual temp compensation

✭ IP54 dustproof and splashproof

✭ 2000-point datalogger downloadable to printer or computer


✭ AC adapter included* *Can also be operated with four AA batteries (not included)

Conductivity

Range 0.00 to 3000 mS/cm



TDS 0 to 200 ppt

Reference Temperature 5°, 10°, 15°, 20°, 25°C


ORION® STAR A215 Benchtop pH/Conductivity Meter/Accessories NCL # Price

Meter and electrode holder MA-1117 1259.10

pH/Conductivity Kit: meter, electrode holder, O-8157 pH/ATC triode, CO-305 conductivity cell, buffers, conductivity standard, storage and cleaning solutions

MA-1117A 1816.20

Conductivity cell, 4-electrode with 1.5 m (4.5 ft.) cable CO-305 512.05

ROSS Ultra epoxy refillable pH/ATC triode O-8157 549.10

CONDUCTIVITY + pH BENCH


ORION® STAR A325 PORTABLE pH/CONDUCTIVITY METER

✭ Reads out conductivity, resistivity, salinity, TDS, pH, and temperature



✭ Accepts either 4-electrode or 2-electrode cells (conductivity)

✭ pH calibration: accepts from 1 to 5 points with either automatic or manual temperature compensation

✭ IP54 dustproof and splashproof

✭ 5000-point datalogger downloadable to printer or computer


✭ Operates with four AA batteries (included)* *Optional AC adapter available

pH

Range 0.0 to 14

Resolution 0.1/0.01/0.001

Relative Accuracy ± 0.002

Conductivity

Range 0.000 to 3000 mS/cm


Salinity 0.01 to 80.0 ppt NaCl equiv.

TDS 0 to 200 ppt

Reference Temp. 5°, 10°, 15°, 20° or 25°C


ORION® STAR A325 Portable pH/Conductivity Meter/Accessories NCL # Price

Meter only MA-1217 1095.00

pH/Conductivity Kit: meter, O-8107 pH/ATC triode, conductivity cell, buffers, conductivity standard, storage and rinse solutions, hard carrying case MA-1217A 1868.00

Gel-filled epoxy pH/ATC triode with 3 m (9 ft.) cable O-8107 482.60

Optional AC adapter for above OA-103 66.80

Hard carrying case for Orion® STAR Portable Meter Series HC-222 138.00

Soft carrying case for Orion® STAR Portable Meter Series SC-333 142.50

Rubber meter boot for Orion® STAR Portable Meter Series RMB-444 104.00

CONDUCTIVITY + pH PORTABLE

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