Our conductivity cells are available as conventional contacting cells and Electrodeless 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.
Our dip conductivity cells are compatible with many other manufacturers' instruments which use 2 electrode cells with constants of 0.1, 1.0 or 10.0 where the cell is fitted with auto temperature compensation the value and/or type of temperature compensator used must be advised.
D201 Dip cell K = 0.1 in PVC with PVC riser tube.
D210 Dip cell K = 1.0 in PVC with PVC riser tube.
Simple low cost conductivity cell for demin and rinse water tanks can be fitted with either a fixed cable or 2 part connector.
D410 Dip cell K = 1.0 in PVDF with PVDF riser tube.
D4100 Dip cell K = 10.0 in PVDF with PVDF riser tube.
Cell for use at elevated temperature with graphite electrodes and kynar body offers good chemical resistance, can be fitted with either a fixed cable or 2 part connector.
Flow line Conductivity Cells
The FL3 cells are of simple design for use on cooling waters and demin plant at ambient temperature and low pressure. The FL3 cell are simple inline cells where the conductivity cell and holder becomes part of the pipe work. Removal of the conductivity cell 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. Cells all have BSP male threads and plug and socket arrangements on the cell heads so the cable can be unplugged before removing the cell to prevent damaging the connecting cable.
IN5 insertion cell made with stainless steel electrodes and PVDF 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 PVDF and stainless steel with 3/4’’ thread
IN5 10I Insertion cell K= 1.0 In PVDF and stainless steel with 3/4’’ thread
CP621 insertion conductivity cells 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. For conductivity measurement of demin water in the power generation and semi conductor industries, the PSE001TPt100 is ideal for use with our C7685-001Ultra 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.
PSE 01 Insertion cell K=0.1 In stainless steel with 3/4’’ thread
PSE 001 Insertion cell K=0.01 In stainless steel with 3/4’’ thread
PSE4 10-HT High temp insertion cell K=1.0 in stainless steel with 3/4” thread.
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.
-Txx option for auto temp comp add the value required after the T, ie; -T10k for a 10 NTC thermistor
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.