Conductivity transducer type cst 2. Sensors for electrical conductivity of aqueous solutions
IET40 series converters sets new standards for conductivity measurement in production. One instrument measures conductivity in the range of approximately 500...1,000 mS/cm. Also measures temperature with an accuracy of 0.2 °C.
Concentration sensor can combine two measurement factors and, using Windows software to configure the 4...20 mA outputs, measure conductivity, % solution concentration, temperature, PPM or salinity.
The RS-485 interface provides controlled access to all configuration parameters and measurements of the conductivity sensor online.
The operator's work is facilitated by a 3-line monochrome backlit LCD display that displays measured values and system status.
- Easy to install
- Inexpensive connection cable
- Operates on low voltage
- One sensor - many applications
- IP66 stainless steel housing
- LCD display, 3 lines x 12 characters
- Selecting Sensor Process Connections
- Electrodeless detachable conductivity sensor
- Fast temperature response t 90< 10 сек
- Can be configured and calibrated before sale
- Full customization devices via software for Windows
- Two analogue outputs 4…20 mA and RS485 interface
- Designed for the food, dairy, brewing industries
- Resistance to thermal surges up to 135°C during steam sterilization
- Measurement of conductivity, % solution concentration, salinity and temperature
Key Features of the Concentration and Conductivity Transmitter
- Monitoring
View the output of the conductivity sensor. Converts conductivity value with/without temperature compensation, plus temperature and some user-programmed parameter, in this case % sodium chloride (NaCl) concentration.
- Settings
Setting up analog outputs:
- Measurement of conductivity, solution concentration, total solution salinity, hardness or temperature
- Setting of 4 and 20 mA values.
- Setting up digital output
- Continuous measurement of conductivity, temperature plus additional parameter, such as concentration.
Setting up the conversion table specific range for conductivity/concentration data.
- Diagnostics
Checking the operation of 4-20 mA outputs using forced fixed values
This is very useful when commissioning the sensor or checking the calibration of devices connected to the transmitter.
Always on display system messages and sensor configurations
Specifications of IET40 conductivity sensors
| Parameter | Meaning |
| Concentration and conductivity sensor parts | ECS/56T with 1.5 BSP threaded mounting ECS/57T with 1.5 BSP threaded mounting ECS/58T Hygienic – can be equipped with Varivent connection ECS/59T Hygienic - can be equipped with connections: DIN, triclamp, RJT or IDF flange 316 stainless steel wetted parts with EPDM seal |
| Sensor characteristics | |
| Maximum constant temperature | 100 °C |
| Short-term maximum temperature | up to 135 °C |
| Maximum working pressure | 100 psi (6.5 bar) |
| Minimum pipe size for sensor installation | 63.5 mm |
| Temperature, pressure and solution composition affect the service life of the sensor. | |
| Other characteristics | |
| Conductivity sensor measurement ranges | 0…1000 mS/cm automatic range switching –20…+150 °C or 0…272 °F |
| Accuracy class | ±1% |
| Conductivity converter outputs | 2× 4…20 mA with isolation up to 2 kV from medium and pipeline measurements. Load up to 750 Ohm (limited by food). Serial interface RS485. |
| Output ranges (applies to all outputs) | |
| Conductivity | Minimum adjustable conductivity range: 0…1 mS/cm maximum: 0…1000 mS/cm (by default the sensor is set to maximum range) |
| Concentration wt/vol. | |
| Sodium chloride | 0…30.9 % |
| Hydrochloric acid | 0…15.0 % |
| Phosphoric acid | 0…25.0 % |
| Sea water | 0…41.3 ppt |
| Sodium hydroxide | 0…16.2 % |
| Sulfuric acid | 0…25.7 % |
| Nitric acid | 0…24.6 % |
| Special custom | 0…99.9%, 2…9 points can be entered |
| Temperature | –20…+150 °C |
| Temperature compensation | Adjustable 0…20% / °C, basic 20 °C or 25 °C |
| Display | Built-in 3-line, 36-character LCD with backlight for display of measured values, analog outputs and error messages |
| Ambient temperature | –20…+50 °C |
| Frame | IP66, stainless steel |
| Concentration converter supply voltage | 12…30 V DC, 14…24 V AC RMS max. load 150 mA at 12 V DC |
| Connecting the conductivity sensor | 11-pin screw headers and 15-pin D-type connector |
| Dimensions/weight | 125x125x185 mm, approx. 2 kg |
Ordering information for IET40 conductivity transmitters
| Model | vendor code |
| IET40 sensor programming kit | Communication kit no. 6164 |
| Conductivity and concentration converter IET40, 2× 4…20 mA, RS485, ModBUS RTU, connection clamp 2", configurable via software | IET40 + ECS-59T-L(2"") |
| Conductivity and concentration converter IET40, 2× 4…20 mA, RS485, ModBUS RTU, DIN nut connection DN50, setup via software |
IET40+ECS-59T-M(50) |
| Conductivity and concentration converter IET40, 2× 4…20 mA, RS485, ModBUS RTU, SMS-nut connection 2", configurable via software | IET40 + ECS-59T-SMS(2"") |
| Conductivity and concentration converter IET40, 2× 4…20 mA, RS485, ModBUS RTU, Varivent connection, software configuration | IET40+ECS-59T-X4 |
Example: IET40+ECS-59T-X4
FLS C6.30 is a family of conductivity transducers consisting of
which includes a 4-20 mA output device (two-wire technology) built into the inductive conductivity sensor. This type of measuring technology provides a wide range of
range of use, especially for measuring high conductivity values (up to 1000
millisiemens) in aggressive liquids (PVCC is the only wetted material). Since no electrodes come into contact with the liquid, reliable and stable measurements over a long period of operation are guaranteed. Corresponding
automatic temperature compensation is provided by Pt100 built into the device housing. The isolated 4-20 mA output is ideal for direct connections to PLCs or data loggers without additional interfaces. The measuring transducer and temperature sensor are supplied already calibrated.
Areas of use
- Water treatment
- Cleaning of drains
- Cooling towers
- Scrubber systems
- Metal processing
- Measurements of corrosive and settling liquids
Key Features
- Resistant to corrosion and plaque formation
- Compact transmitter
- No calibration required
- Easy to install
- Built-in Pt100 sensor
- Suitable for submerged installation
General information
- Shell material: CPVC
- Case length: 207 mm
- Housing: IP68
- Power supply: 10-30V DC current
- Maximum working pressure/working temperature:
- 10 bar (145 psi) at +25°C (77°F)
- 6 bar (87psi) at +50°C (122°F)
- Process Connection: 1½” NPT Male Thread
Standards and certifications
- Manufactured according to ISO 9001
- Manufactured according to ISO 14001
- RoHS Compliant
- GOST R
- Cable: 3 m (9 ft)
- Male thread: 1½” NPT
- Covering: C-PVC
| inductive conductivity transducers C6.30 | ||||||
| № component |
Description/ Name |
Areas of use/ operating range |
Constant element |
Compound | Recommendations on installation |
Weight (g) |
| C6.300.01 | Inductive measuring PVC-C complete with temperature sensor |
0-10 µs | - | 3m | external thread 1 1/2" NPT |
550 |
| C6.300.02 | Inductive measuring conductivity converter PVC-C complete with temperature sensor |
0-100 µs | - | 3m | external thread 1 1/2" NPT |
550 |
| C6.300.03 | Inductive measuring conductivity converter PVC-C complete with temperature sensor |
0-1000 µs | - | 3m | external thread 1 1/2" NPT |
550 |
Conductivity sensors measure the ability of a solution to conduct electricity. This ability is determined by the number of ions contained in the solution, and the number of ions is one of the parameters that is used to determine the amount of impurities in the liquid.
Measuring electrical conductivity is quite simple and at the same time effective method water quality control - purified water, tap water, NaCl solutions and sea water of the same temperature have different electrical conductivity.
PRINCIPLE OF OPERATION
A pair of electrodes is placed in the solution, the electrical conductivity of which is measured. The alternating voltage that is applied to the electrodes causes the ions contained in the solution to move, which creates an electric current i. There are two voltage drop measurement schemes: 2-electrode and 4-electrode.
In the first case, the voltage drop U out is measured between the current electrodes, and in the 4-electrode circuit an additional pair of potential electrodes is used for measurements. Voltage drop U out is an indicator of the conductivity of the solution.
Electrical conductivity σ is defined as the reciprocal of the resistance in a given cell. A cell is a volume limited by current electrodes that have an area S and are separated from each other by a distance d . The values of S and d are determined by the geometry of the sensor, therefore they are unchanged and are expressed through the cell constant k :
k = d/S - cell constant, cm -1. Thus, conductivity is calculated by the formula m σ = k/R or σ = (k * i) / U out , where the variable is voltage U out
Conductivity is determined both by the concentration of ions contained in a solution and by their mobility. Both of these parameters depend on the temperature of the solution, so the measurement electrical conductivity should be carried out in conjunction with monitoring the temperature of the liquid.
Because both ion concentration and mobility depend on solution temperature, temperature control is necessary when measuring conductivity.
CONDUCTIVITY SENSOR STRUCTURE
The sensitive element consists of two pairs of electrodes and a temperature sensor - Pt1000 thermal resistance.
CONDUCTIVITY SENSORS SERIES
IST produces three series of conductivity sensors - LFS1305, LFS1505 and LFS1710, which differ in the value of the sensor cell constant.
Until 2017, the LFS1505 and LFS1710 series were designated LFS155 and LFS117, respectively. Sensors with "old" designations do not have any design differences compared to sensors with "new" designations
The characteristics of the series of electrical conductivity sensors are given in the table.
| LFS1305 Series | LFS1505 Series | LFS1170 Series | |
| Conductivity measurement range | 0.1 to 200 mS/cm | 0.1 to 200 mS/cm (can be extended) | 0.2 to 200 mS/cm |
| Cell constant k | 0.86 cm -1 | 0.68 cm -1 | 0.44 cm -1 |
| Recommended sensor polling rate | 100 Hz to 10 kHz | 50 Hz to 3 kHz | |
| Recommended input voltage | Alternating voltage of sinusoidal or symmetrical rectangular shape with amplitude Vpp = 0.7 V | ||
| Sensor size | 12.9 × 5.5 × 0.65 mm / 1.2 mm | 14.9 × 5.5 × 0.65 mm / 1.2 mm | 16.9 × 9.9 × 0.65 mm / 1.2 mm |
| temperature sensor | Platinum resistance thermometer Pt1000 with temperature coefficient 3850 ppm/K and tolerance class B or C | ||
| Operating temperature range | -20 to +100 °C | ||
COST OF SENSORS
Retail prices apply when purchasing sensors in quantities of up to 10 pieces. You can expect a significant price reduction when ordering bulk quantities, for example when ordering 100 or more pieces. the price of the electrical conductivity sensor will be reduced by 25% relative to retail.
AVAILABLE SENSORS VERSIONS
Sensors of each series are available in various versions, which differ in the length and type of leads, as well as the tolerance class of the built-in thermal resistance.
On request, sensors are also available in an additional plastic housing.
To decipher the designations of electrical conductivity sensors, you can use the following diagram:
| LFS1K0- electrical conductivity sensor with built-in thermal resistance type Pt1000 | |||||
| 1305
- LFS1305 series - cell constant 0.86 cm -1 1505 (previously 155) - LFS1505 series - cell constant 0.68 cm -1 1710 (previously 117) - LFS1710 series - cell constant 0.44 cm -1 |
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| 2I- insulated leads (Cu/Ag, PTFE insulated, AWG 30) 6W- non-insulated leads (Pt/Ni wires, Ø 0.2 mm) |
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| B- tolerance class of built-in thermal resistance - class B (F0.3) WITH- tolerance class of built-in thermal resistance - class C (F0.6) |
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| 070 - length of leads in mm | |||||
| 6 - number of pins | |||||
| LFS1K0. | 1505. | 2I. | B. | 070 | -6 |
DOCUMENTATION
Documentation for electrical conductivity sensors is available at
