Conductivity cells, probes, electrodes 2 electrode and 4 electrode type for conductivity resisitivity, salinity and dissolved solids


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Conductivity Cells

Types of Conductivity Cell

2 Electrode Cell
The two electrode cell is the most commonly used conductivity cell Glass cells have electrodes made of platinum. Epoxy cells have easy to clean graphite plates. The conductivity cells on this page do not have errors caused by fringe field effects because the entire measuring field is contained within the electrode body. This kind of probe can be used with almost any conductivity meter.

4 Electrode Cells
The electrode design reduces the problem of polarization error and fouling of the electrode. (polarization comes about because electro-chemical reaction with the probe surface ). In the four electrode design alternating current is applied only to the outer pair of rings. The voltage is measured on the inner rings without polarization effects because no current flows in the measuring circuit. This type of probe is superior in function in almost any solution and covers the whole conductivity range with one probe,

Conductivity 25° C

Water	uS/cm
Ultra pure water	0.055
Distilled water	0.5 - 5
Rain water	20 - 100
Mineral water	50 - 200
River water	250 - 800
Tap water	100 - 1500
Surface water	30 - 7000
Waste water	700 - 7000
Brackish water	1000 - 8000
Ocean water	40000 - 55000

Chemicals	mS/cm
KCl 0.01M	1.41
MgSO4	5.81
KCl, 0.1 M	12.9
H2SO4	82.6
KCl, 1.0 M	112
NaOH 50%	150
NAOH 5%	223
NaCl saturated	251
HCl 10%	700
HNO3 31% (highest known)	865

Conductivity Cells with 2 Electrodes

Model	2 electrodes, Epoxy Cell, graphite plates, 110 mm x 12 mm body, BNC plug	Price
CS SK10B Cell Constant 1 10uS - 10 mS/cm 0-80 °C		$105.00
CS SK10T Cell Constant 1 10uS - 10 mS/cm 0-80 °C Pt1000		$145.00
2 electrodes, glass cell, platinum plates, 110 mm x 12 mm body, BNC plug
CS SK20B Cell Constant 1 1us - 100 mS/cm 0-110°C		$130.00
CS SK20T Cell Constant 1 0 - 200 mS/cm 0-100 degC Pt1000		$159.00
2 electrodes, glass cell, platinum plates, 120 mm x 6mm, body BNC or DIN plug
S216T Cell Constant 1 0 - 200 mS/cm Pt1000 0-100°C BNC		$242.00
S216V Cell Constant 1 0 - 200 mS/cm 0-100°C Pt1000 DIN 8 for 910 series meters		$242.00
2 electrodes, glass cell, platinum Plates, 110 mm x 12mm body, BNC plug
CS SK21T Cell Constant 0.1 0.1 uS - 10 mS/cm 0-110°C Pt1000		$189.00
2 electrodes, glass body, platinum plates, 130 mm x 12mm body, BNC plug
CS SK23T Cell Constant 10 10 - 1000 mS/cm 0-110°C Pt1000		$189.00

Conductivity Cells with 4 Electrodes

4 electrodes, epoxy body, platinum plates, 110 x 15 mm body DIN8 connector for 910 series meters		Price
CS SK40T Cell Constant 0.5 0.1uS - 1000 mS/cm 0-80 degC Pt1000		$260.00
4 electrodes, glass body, platinum plates 120 x 15 mm body DIN8 connector for 910 series meters
CS SK41T Cell Constant 1.0 0 - 1000 mS/cm 0-100 degC Pt1000		$310.00

Pipe fittings for conductivity probes with flanged boot, item 4 makes an 'o' ring seal to the body of a standard 12 mm diameter probe and has a 1/2" NPT thread.
Item 5 is a shield to protect a submersible probe, it has a 3/4" FNPT thread to attach to a 3/4" MNTP pipe

Submersible conductivity probes
These electrodes are designed for continuous conductivity monitoring, either in a pipline or submerged in a tank. They are constructed with a 3/4" MNPT threaded ends for ease of installation. The probes include an integral resistance thermometer. The electrodes are platinum. The electrodes may be used to 150 psi.

Topac Inc. 231 CJC Highway, Suite 103 Cohasset MA 02025 USA
Tel: 781 740 8778 Fax: 781 740 8779