Overview
Contacting conductivity sensors measure conductivity of a solution via electrodes. They are ideal for use in cooling towers and boilers, reverse osmosis equipment, and other non-oily applications. A variety of cell constants are available to handle a range of conductivities.
Cooling Tower Contacting Conductivity Sensors
These cell constant 1.0 sensors are designed for cooling towers with water up to 30,000 μS/cm. Lower pressure (up to 150 PSI, 10 atm) polypropylene sensors are available with graphite or stainless steel electrodes, and may be installed inline or submersion. High pressure (up to 300 PSI, 20 atm) inline sensors are constructed from stainless steel and PEEK.
WebMaster controllers require active sensors. These sensors contain electronics to convert the sensor signal to a voltage that these controllers can read. W400 series controllers use passive sensors that have cables dressed specifically for them. W100 series controller’s passive sensors are dressed differently.
Performance specifications vary with the type of controller, refer to the controller brochure. Typical cooling tower temperatures are 0 to 70 °C, 32 to 158 °F.
Boiler Contacting Conductivity Sensors
These cell constant 1.0 sensors are designed for boilers with water up to 10,000 μS/cm and pressures up to 250 PSI, 16.7 atm). These inline sensors are constructed from stainless steel and PEEK.
WebMaster controllers require active sensors. These sensors contain electronics to convert the sensor signal to a voltage that these controllers can read. W400 and W100 series controllers use passive sensors.
Performance specifications vary with the type of controller, refer to the controller brochure. Typical boiler temperatures are 0 to 205 °C, 32 to 401 °F.
General Purpose Contacting Conductivity Sensors (for W100/600/900 Series)
These passive sensors are available in a variety of cell constants for use in conductivities up to 300,000 μS/cm. Typical applications include RO systems and boiler condensate monitoring. They may be mounted inline or submersion, using either polypropylene (0-100 °C, 100 PSI) or stainless steel (0-120 °C, 200 PSI) ½” NPT mounting fittings.
| Cell Contacting Conductivity | Range | Resolution | Accuracy |
|---|---|---|---|
| 0.01 | 0 – 300 µS/cm | 0.01 µS/cm, 0.0001 mS/cm, 0.001 mS/m, 0.0001 S/m, 0.01 ppm | ±1% of reading |
| 0.1 | 0 – 3,000 µS/cm | 0.1 µS/cm, 0.0001 mS/cm, 0.01 mS/m, 0.0001 S/m, 0.1 ppm | ±1% of reading |
| 1.0 | 0 – 30,000 µS/cm | 1 µS/cm, 0.001 mS/cm, 0.1 mS/m, 0.0001 S/m, 1 ppm | ±1% of reading |
| 10.0 | 0 – 300,000 µS/cm | 10 µS/cm, 0.01 mS/cm, 1 mS/m, 0.001 S/m, 10 ppm | ±1% of reading |
Note:Conductivity ranges above apply at 25°C. At higher temperatures, the range is reduced per the range multiplier chart.
| Temperature °C | Range Multiplier % |
|---|---|
| 0 | 181.3 |
| 10 | 139.9 |
| 15 | 124.2 |
| 20 | 111.1 |
| 25 | 100 |
| 30 | 90.6 |
| 35 | 82.5 |
| 40 | 75.5 |
| 50 | 64.3 |
| 60 | 55.6 |
| 70 | 48.9 |
| 80 | 43.5 |
| 90 | 39.2 |
| 100 | 35.7 |
| 110 | 32.8 |
| 120 | 30.4 |
| 130 | 28.5 |
| 140 | 26.9 |
| 150 | 25.5 |
| 160 | 24.4 |
| 170 | 23.6 |
| 180 | 22.9 |
