Our conductivity sensors are available as conventional contacting cells and Electrodeless conductivity cells, sometimes called Torroidal or Inductive cells. we are regularly asked what the difference is and which is the best to use.
The conventional contacting cell has 2 or more electrodes (depending upon the cell constant) which come into contact with the solution to measure the electrical resistance. If the solution is dirty, has a high solids content, contains fat, grease or oil, these may coat the electrodes and give unusually low erroneous readings generally lower than the true conductivity. Contacting cells are fine for solutions which are clean and usually with low conductivities.
Electrodeless cells have two coils, (a transmit and a receive coil) placed close together with a hollow centre for the solution to flow through. The solution becomes in effect the plates of a transformer, the higher the conductivity the greater the induced current from one coil to the other, hence inductive conductivity. Electrodeless conductivity works best on solutions with higher conductivities. As there is no contact with the solution the cell is not affected by a high solids content, fat, grease or oil that may coat the cell, there must however be a free passage through the cell. Electrodeless cells work well when measuring the solution strength of dilute acid and alkalis etc.
Automatic temperature compensation:- The conductivity of a solution varies with temperature the change for towns tap water supply is around 2% per degree centigrade, so a change of 10°C in the solution temperature will make a 20% change in the conductivity reading. It is usual to base conductivity readings to a standard temperature, ie; all the readings are corrected to the reading that would be obtained if the solution was at that temperature. The international standard is usually 25°C although 20°C is used in some UK industries, this is referred to as the base temperature.
Most instruments have the automatic temperature slope fixed at 2%/°C to a base of 25°C. For those customers who require greater accuracy our model C7685 conductivity controller has adjustable slope coefficient and base temperature, there is also a version with the special auto temperature compensation for ultra pure water with readout in either conductivity or MΩ.
Our dip cells are compatible with our range of high linearity conductivity controllers as well as with many other manufacturers' instruments which use 2 electrode cells with constants of
Please see the data sheet for more information on how the K values of the cell correlates to the conductivity values.
Most of our conductivity sensors are available with integral automatic temperature compensation. If you're planning on using one of our cells with a non AWE instruments conductivity instrument then please advise the make and model so we can ensure the ATC (automatic temperature compensation) is compatible.
Our ex-stock conductivity dip cells include the following:-
D2-01 Dip cell K = 0.1 in PVC with PVC riser tube for a maximum temperature of 50°C.
D2-10 Dip cell K = 1.0 in PVC with PVC riser tube for a maximum temperature of 50°C
The D2 cells are ideal as a low cost dip cell for use in demineralised water tanks or rinse water tanks. These can be fitted with either a fixed length of cable, or a 2 part connector.
The D1 Range of dip cells are designed for use in environments where the temperature may exceed the 50°C limit of the D2 cells.
The standard D1 range are manufactured in PVC. Stainless steel or PVDF tubing is also available.
D1-10 Dip Cell K = 1.0 in epoxy with cPVC for a maximum temperature of 80°C
D1-10- Dip Cell K = 10.0 in epoxy with cPVC for a maximum temperature of 80°C
D4-100 Dip cell K = 10.0 in PVDF with PVDF riser tube.
All PVDF construction with graphite electrodes, this is the cell designed for use at elevated temperature. It also offers excellent chemical resistance and can be fitted with either a fixed cable or 2 part connector.
Flow line Conductivity Cell
The FL3 cells are of simple design for use on cooling water controllers and demin plants at ambient temperature with a low pressure. The FL3 cell are simple inline cells where the cell and holder becomes part of the pipe work. Removal for cleaning and calibration requires no tools and can be accomplished in a few minutes.
FL310 Flow line cell with QR fitting in PVC K = 1.0
FL301 Flow line cell with QR fitting in PVC K = 0.1
Insertion Conductivity Cells
Insertion cells are designed for inserting into larger diameter pipework or the side of a vessel. Where possible it is always best to install any conductivity sensor so removal and replacement is as easy as possible and make use of isolaton / drain valves. Our insertion conductivity cell range have BSP male threads for easy installation and for removal during periodic calibration.
IN5 insertion cell made with stainless steel electrodes and PVC body, providing easy and cost effective installation fast accurate and reliable performance for a wide range of industrial applications.
IN5 01 Insertion cell K= 0.1 In PVC and stainless steel with 3/4’’ thread
IN5 10 Insertion cell K= 1.0 In PVC and stainless steel with 3/4’’ thread
The IN5 range is also available with wetting parts in PVDF and Carbon for greater chemical resistance.
CP621 insertion cells are made with graphite electrodes and PVC body mounting by 3/4” male thread and fitted with plug and socket connector for easy fitting and removal of the cell. The graphite electrodes provide a greater measuring range making this a versatile conductivity sensor for general applications.
CP621-10 Insertion cell K=1.0 In cPVC epoxy& graphite with 3/4’’ thread.
CP621-01 Insertion cell K= 0.1 In cPVC epoxy & graphite with 3/4’’ thread.
CP721 insertion cells made with graphite electrodes and Peek body mounting by 3/4” male thread and fitted with plug and socket connector for easy fitting and removal of the cell.
The peek body offers greater chemical resistance and an extended temperature range allowing the measurement of chemical solutions at elevated temperatures ideal for use with our C7685 conductivity controllers
CP721-10 Insertion cell K=1.0 In Peek and graphite with 3/4’’ thread
CP721-100 Insertion cell K= 10.0 In Peek and graphite with 3/4’’ thread
PSE insertion cells made from 316 stainless steel, mounting by 3/4” male thread and fitted with plug and socket connector for easy fitting and removal of the cell.
PSE-01 Insertion cell K=0.1 In stainless steel with 3/4’’ thread. For measuring a either 0 - 20.0µS or 0 - 2.00µS when paired with an AWE Instruments C7685 controller.
PSE-001 Insertion cell K=0.01 In stainless steel with 3/4’’ thread. Designed exclusively for measuring the resistivity of ultra-pure water when paired with the C7685-010 resistivity controller.
PSE4 10-HT High temp insertion cell K=1.0 in stainless steel with 3/4” thread.
The PSE-01 is commonly used for measuring the conductivity value of demin water in the power generation and semi conductor industries, the PSE001TPt100 is ideal for use with our C7685-001 Ultra pure water conductivity controller. The PSE4 10-HT is a high temp cell for use with steam condensate monitoring, dump systems and boiler blowdown systems of the cycling sampling system where a sample is taken at regular time intervals.
-Txx option for auto temp comp add the value required after the T, ie; -Tpt100 for a PT100 temperature compensation or -T10k for a 10 NTC thermistor
Tri-Clamp Conductivity Cells
Our inline cells are available with a Tri-Clamp fitting for use in sanitary services and the food industry. The electrode body is manufactured in stainless steel with a flush finish allowing crevice free cleaning and to allow steam to surround body of the measurement device for sterilisation. The cells are available with cell constant K=0.1, k=1.0 and K=10.0.
Wetted parts available include Stainless Steel and PTFE or Stainless Steel and PEEK (PVDF). Please call our sales hotline on 01785 254 597 for more information.
Our insertion cell may be installed for inline use by fitting the cell into a flow cell. The flow cell can be installed on a bypass line with valves in the line so the cell can be isolated for maintenance and calibration
-T- PVC Tee with adaptors to 3/4” BSP
-T- PP Polypropylene Tee with adaptors to 3/4” BSP
-T- SS Stainless Steel Tee with adaptors to 3/4” BSP
LMK2 Our special conductivity connecting cable for use with uncompensated conductivity cells, heavy duty copper conductors and screen.
LMK4 Our special conductivity connecting cable for use with temperature compensated conductivity cells, heavy duty copper conductors and screen.
EC - JB Weatherproof J- box with connectors for use with conductivity connecting cables.
Conductivity Calibration Solutions
Conductivity calibration solutions supplied ready made up in 500 ml plastic bottles.
C1000 1000 μS at 25°C
C2000 2000 μS at 25°C
C10,000 10,000 μS at 25°C
ACS AWE. Instruments conductivity simulator used for checking the calibration of any conductivity instrument with a two electrode input.
ACS1 Conductivity simulator 11 switched outputs from 1- 100,000 μS.
AIS1 AWE. Instruments current simulator 0 - 22 mA in 12 steps used for calibrating the input into any device which has a current input from a transmitter.