- What the RK500-13 is: an all-in-one online conductivity sensor from Rika Sensor (Hunan Rika Electronic Tech Co., Ltd). It outputs 4–20 mA and RS485 simultaneously, is rated IP68, runs on 7–30 VDC and draws under 0.2 W. No external transmitter is needed — it connects directly to a PLC, RTU, DTU or data logger.
- What it measures: 0–20,000 µS/cm (0–20 mS/cm) at ±1% FS, for freshwater, aquaculture, municipal wastewater, source water and general industrial water.
- How to choose the model: A Economy (ABS + graphite), B Standard (nylon fiber + 316 electrode), C Heavy-duty anti-corrosion (nylon fiber + graphite), D Food grade (316L + PEEK construction, 0–100 °C temperature compensation, 2.0 MPa pressure rating; operating temperature subject to configuration).
- Start with five variables: water corrosivity, expected conductivity range, temperature, pressure and installation method. A wider range is not better — at ±1% FS, the wider the range, the larger the absolute error.
- Application limits: the standard configurations cover 0–20 mS/cm (0–20,000 µS/cm). Brine, full-strength seawater (about 50 mS/cm) and severe scaling duties fall outside that standard range and call for four-electrode or toroidal instruments; type C supports additional custom ranges on request.
1. What Does Conductivity Measure?
Conductivity (Electrical Conductivity, EC) measures how well water carries an electric current, which in practice reflects the total concentration of dissolved ions. The purer the water, the fewer the ions and the lower the conductivity; the more dissolved salts, acids and bases, the higher the reading. The common units are microsiemens per centimeter (µS/cm) and millisiemens per centimeter (mS/cm):
1 mS/cm = 1,000 µS/cm
Conductivity is not a pollutant concentration, and it cannot tell you which ions are present. What it does do is respond quickly to changes in total ionic content, which is why it works as a first-line warning indicator: illegal industrial discharge, sewage leakage, seawater intrusion, fertilizer runoff and evaporative concentration all tend to show up on the conductivity curve before anything else.
1.1 Specific Conductance: Why Every Reading Needs a Reference Temperature
Conductivity rises with water temperature. The rule of thumb is about 2% per °C, and the actual figure ranges from 2% to 4% depending on ionic composition. In a pond, the raw reading at noon and before dawn can differ by more than 5%, so a conductivity value without a stated temperature is difficult to compare with anything.
The convention is to compensate the measured value to 25 °C and report it as specific conductance, written µS/cm @ 25 °C. When comparing sites, seasons or years, confirm that the instrument applies 25 °C compensation and that the compensation coefficient matches the water body.
On the RK500-13, models A, B and C apply automatic temperature compensation from 0 to 60 °C; model D covers 0 to 100 °C.
1.2 Conductivity, TDS and Salinity: Convertible, Not Interchangeable
The three are closely related but serve different purposes:
- TDS (total dissolved solids) is reported in mg/L and is usually estimated from conductivity: TDS ≈ EC × 0.55–0.7, with 0.65 as the common default. High-salinity water, or water rich in calcium sulfate or chloride, can justify a factor of 0.8. For an accurate TDS value, use the gravimetric evaporation method.
- Salinity is derived from conductivity and temperature through empirical equations such as PSS-78, normally reported in psu or ‰. It matters mainly in ocean, estuary and aquaculture work.
- Conductivity is the direct measurement: fastest to respond and best suited to trends and alarms.
One common mistake is to treat the reading of a TDS pen as conductivity, or to multiply conductivity by 0.5 and call the result TDS. With the wrong coefficient, the error can exceed 30%.
1.3 Typical Conductivity Ranges by Water Type
The table below gives the commonly cited ranges at 25 °C. Real values move with geology, season, tides and pollution sources, so use these figures for selection estimates only, never as a substitute for a site measurement.
| Water type | Typical conductivity (µS/cm) | Notes |
|---|---|---|
| Ultrapure / deionized water | 0.05 – 5 | Power plants, laboratories, semiconductor |
| Rainwater | 10 – 50 | Affected by atmospheric dust and dissolved gases |
| Drinking water | 50 – 800 | The EPA secondary standard for TDS is 500 mg/L, roughly 700–800 µS/cm |
| Rivers and lakes (freshwater) | 100 – 2,000 | Strongly influenced by catchment geology and season |
| Freshwater aquaculture | 200 – 2,000 | Varies widely by species; set per stock |
| Municipal wastewater / secondary effluent | 500 – 3,000 | Industrial effluent accepted into the sewer can be much higher |
| Brackish water / estuaries | 2,000 – 20,000 | Tidal influence; large diurnal swings |
| Seawater | about 50,000 (50 mS/cm) | Salinity around 35; varies with temperature |
2. Measurement Principle: Two Electrodes, Variable-Frequency Excitation and Anti-Polarization
The RK500-13 uses a two-electrode conductivity cell with the frequency conversion method, together with an anti-polarization design that addresses the polarization weakness of two-electrode cells. Electrode material depends on the model: types A and C use graphite, type B uses 316 stainless steel, and type D uses a 316L/PEEK construction.
The measurement can be reduced to three steps:
- An alternating excitation voltage is applied across the cell electrodes immersed in the water.
- The resulting current is measured; its magnitude depends on the ion concentration in the water.
- The cell constant and the temperature compensation are applied to convert the result into conductivity.
Polarization is the main problem a two-electrode cell has to manage. If the excitation is not handled correctly, ions accumulate near the electrode surface and form a polarized layer, the effective resistance rises, and the reading becomes low and slowly drifting. The usual countermeasures are alternating polarity and variable-frequency excitation, so that polarization does not have time to build up, combined with electrode materials that are chemically inert and resistant to fouling.
Graphite electrodes offer chemical stability, resistance to acids and alkalis, moderate cost and little passivation by common contaminants. Combined with a nylon fiber housing, they provide insulation, corrosion resistance and mechanical strength. That is why models A and C use graphite.
Galvanic isolation addresses another field problem: pumps, variable-frequency drives and large contactors can inject common-mode interference into the signal loop, which appears as jitter on the 4–20 mA output. Internal signal isolation substantially reduces that effect.
One caveat worth stating plainly: a two-electrode cell is at its best in the low-conductivity range, ultrapure water in particular, while at high conductivity the effects of polarization and electrode fouling grow. Four-electrode and toroidal designs are stronger over wide ranges and in fouling service. This is also why the RK500-13 is positioned for standard ranges up to 20 mS/cm rather than brine.
| Cell type | Typical range | Polarization | Fouling resistance | Cost | Typical use |
|---|---|---|---|---|---|
| Two-electrode | 0–20 mS/cm (design dependent) | Depends on excitation | Moderate | Low | Freshwater, wastewater, aquaculture, general industry |
| Four-electrode | 0–200 mS/cm | Good | Good | Medium | Wide-range and general industrial processes |
| Toroidal (inductive) | 0–2,000 mS/cm | None | Best | High | High salinity, heavy scaling, slurries, seawater |
Industry rules of thumb; confirm the actual range against each manufacturer's datasheet.
3. RK500-13 Specifications at a Glance
3.1 Differences Between the Four Models
| Item | A Economy | B Standard | C Heavy-duty anti-corrosion | D Food grade |
|---|---|---|---|---|
| Body material | ABS housing + graphite electrode | Nylon fiber + 316 electrode | Nylon fiber + graphite electrode | 316L + PEEK |
| Conductivity range (µS/cm) | 0–2,000 / 5,000 / 10,000 / 20,000 | Same as A | Same as A; other ranges customizable | 0–50 / 500 / 10,000 / 20,000 |
| Pressure resistance | 0.8 MPa | 1.0 MPa | 1.0 MPa | 2.0 MPa (long-term ≤ 1.6 MPa recommended) |
| Temperature compensation | 0–60 °C automatic | 0–60 °C automatic | 0–60 °C automatic | 0–100 °C automatic |
| Process connection | Bottom NPT3/4 | Bottom NPT3/4 | NPT3/4 top and bottom | NPT3/4 (D1, D2); 50.5 mm clamp (D3) |
| Typical use | General freshwater, mild corrosion | Conventional freshwater, higher pressure | Aquaculture, aggressive wastewater, complex conditions | Food and beverage, high temperature and pressure, hygienic lines |
3.2 General Specifications
| Parameter | Specification |
|---|---|
| Output signal | 4–20 mA and RS485 simultaneously (model D also supports two-wire 4–20 mA) |
| Supply | 7–30 VDC; 22–28 VDC for the two-wire version of model D |
| Accuracy | ±1% FS |
| Power consumption | < 0.2 W |
| Measuring principle | Frequency conversion method |
| Response time | 1 s |
| Drift | ≤ 0.3% FS / 24 h |
| Ambient temperature | 0–60 °C (high-temperature electrodes available on request) |
| Ingress protection | IP68 |
| Storage conditions | 10–60 °C, 20%–90% RH |
| Cable length | 5 m standard, custom lengths available |
| Dimensions | Varies by model and configuration; see the dimensional drawings in the RK500-13 V5.0 datasheet for overall length, insertion length and process connection. |
Full dimension drawings, thread details and mounting accessories are given in the datasheet: download the RK500-13 datasheet (PDF).
What ±1% FS actually means: FS stands for full scale. An accuracy of ±1% FS is relative to the top of the range, not to the current reading. That single detail determines how the range should be chosen, as the next section explains.
3.3 Application Boundaries
- Within the range: water from 0 to 20 mS/cm — freshwater, aquaculture, municipal wastewater, source water and general industrial water — with A/B/C/D selected by material and hygienic requirement.
- Beyond the range: full-strength seawater (about 50 mS/cm), brine and concentrated salt solutions exceed the standard 20 mS/cm range and fall outside the standard application boundary. Type C supports additional custom ranges on request, subject to technical confirmation; four-electrode or toroidal sensors are the appropriate choice where the application demands them.
- Special conditions: sustained water temperature above 60 °C requires confirmation with RIKA — the standard measurement environment is 0–60 °C, model D provides temperature compensation to 100 °C but is not thereby rated for 100 °C service, and high-temperature electrodes are available on request; heavily scaling or fouling media call for a shorter cleaning interval or a toroidal sensor; hygienic food and pharmaceutical lines call for the D3 clamp version.
4. A Five-Step Selection Method
Step 1: Match the Model to Water Corrosivity
- A Economy: surface water, groundwater and mildly corrosive circulating water. The ABS housing keeps cost down, which suits projects with many monitoring points.
- B Standard: conventional freshwater monitoring and pipework or tanks at slightly higher pressure. The 316 electrode and nylon fiber housing combine corrosion resistance with pressure resistance.
- C Heavy-duty anti-corrosion: aquaculture, aggressive wastewater and industrial effluent of complex composition. Graphite tolerates acids, alkalis and salts well, and the NPT3/4 threads at both ends simplify in-line installation.
- D Food grade: food and beverage, pharmaceuticals and hygienic lines that are cleaned and sterilized. The 316L + PEEK construction, 0–100 °C compensation and 50.5 mm clamp on the D3 allow quick removal and reassembly.
Step 2: Choose the Range and Calculate the Absolute Error
An oversized range is the most common and most easily overlooked mistake in the field. Because the accuracy is ±1% FS, the wider the range, the larger the absolute error:
| Expected sample conductivity (µS/cm) | Recommended range | Absolute error at ±1% FS |
|---|---|---|
| 0 – 50 | 0–50 (model D) | ±0.5 µS/cm |
| 50 – 500 | 0–500 (model D) | ±5 µS/cm |
| 500 – 1,500 | 0–2,000 | ±20 µS/cm |
| 1,500 – 4,000 | 0–5,000 | ±50 µS/cm |
| 4,000 – 8,000 | 0–10,000 | ±100 µS/cm |
| 8,000 – 15,000 | 0–20,000 | ±200 µS/cm |
An example: the sample sits at 800 µS/cm all year. With the 0–2,000 range the error is about ±20 µS/cm; with the 0–20,000 range it is about ±200 µS/cm — ten times larger. As long as the peak value stays inside the range, the closer the range is to the actual duty, the better.
A practical starting point is to size the range at 1.5–2 times the expected maximum. That leaves headroom for normal variation without wasting accuracy on unused range.
Step 3: Check the Temperature
- Water consistently above 60 °C: confirm the allowable operating temperature with RIKA. Model D provides automatic temperature compensation over 0–100 °C, but that is not by itself a 100 °C operating rating; high-temperature electrodes are available on request.
- Water with large temperature swings (aeration tanks, heat-exchanger outlets): confirm that temperature compensation is enabled and place the probe where the temperature is relatively stable.
Step 4: Check the Pressure
- Model A is rated 0.8 MPa, models B and C 1.0 MPa, and model D 2.0 MPa.
- Although model D is rated 2.0 MPa, the manufacturer recommends keeping long-term operating pressure at or below 1.6 MPa. Size for continuous working pressure, not for the peak.
Step 5: Check the Installation and Output
- Open tanks, channels and aquaculture ponds: immersion mounting with a 1 m bracket.
- Closed pipework: screw the NPT3/4 thread directly into the line, and allow for straight runs upstream and downstream.
- Hygienic lines: the D3 clamp connection.
- Control system: if the panel only has a 4–20 mA input card, use the analog output; if a PLC or RTU is available, prefer RS485 for better noise immunity and more information per cable. Both can be used at the same time.
Typical Configurations by Application
| Application | Recommended model | Suggested range | Mounting |
|---|---|---|---|
| Freshwater aquaculture / recirculating systems | C | 0–2,000 or 0–5,000 | Immersion + bracket |
| Municipal wastewater inlet / aeration tank | C or B | 0–5,000 / 0–10,000 | Immersion or in-line |
| Rivers and reservoirs (source water) | B | 0–2,000 | Immersion + bracket |
| Groundwater / seawater intrusion | B | 0–10,000 or 0–20,000 | Monitoring well immersion |
| Food and beverage / pharmaceutical | D | 0–500 or 0–10,000 | Clamp or threaded |
| Oil and gas pipeline corrosion monitoring | C | Per water analysis | Pipeline bypass |
| Ultra-low conductivity (< 100 µS/cm) | D | 0–50 / 0–500 | Flow cell |
5. Installation: Air Bubbles Come First
The installation guidance below is general engineering practice; follow the selected model's manual and site conditions for the final layout.
The datasheet contains one easily overlooked instruction: whatever mounting method you use, avoid air bubbles inside the conductivity cell.
Bubbles attached to the electrode surface reduce the effective conductive area, so the reading drops and becomes unstable — and is often misdiagnosed as a failed sensor. In the field, bubbles and fouling are the two most common causes of a drifting conductivity reading.
5.1 Immersion Mounting
- Use the 1 m stainless steel bracket and fix the probe vertically or at an angle.
- Keep the probe at least 20 cm above the tank floor and 20 cm below the water surface, clear of bottom sludge and surface scum.
- Do not mount it directly above an air diffuser, below a weir or waterfall, or in front of a mixer — those positions produce the most bubbles.
- In rivers and channels, avoid dead zones and recirculation zones, and make sure a slow flow passes the electrodes.
5.2 In-Line Mounting
- Screw the NPT3/4 thread into the pipe wall or a tee.
- Prefer the side or lower side of a horizontal run: the top collects air, the bottom collects sediment.
- Avoid pump outlets and the turbulence and negative pressure downstream of valves; install far enough downstream of bends and reducers to be in a stable flow.
- With threads at both ends, model C can be arranged as a bottom-in, top-out flow-through cell, which vents air more easily.
5.3 Flange and Hygienic Mounting
- The D3 uses a 50.5 mm clamp, which suits quick removal and clean-in-place on food, beverage and pharmaceutical lines.
- Match the seal material to the cleaning temperature.
5.4 Electrical Installation
- Use shielded cable for both the 4–20 mA and the RS485 run, with the shield grounded at one end only.
- Route signal cable separately from VFD output cable and motor power cable; avoid long parallel runs.
- The 7–30 VDC supply and sub-0.2 W draw allow the sensor to share power with a solar-powered remote station.
- After power-up, confirm that the 4–20 mA range matches the settings in the control system (the range mapping is fixed at the factory configuration) before putting the loop into service.
6. Calibration and Maintenance
The calibration and maintenance intervals below are recommendations; actual procedures should follow the selected model's manual and site conditions.
6.1 Verify First, Then Decide Whether to Adjust
Sensors are normally calibrated at the factory for the range ordered. Verify the reading against a standard solution before commissioning and every one to three months, rather than recalibrating every time. Frequent recalibration can introduce human error rather than remove it.
Common conductivity standards at 25 °C:
| Standard solution | Nominal value | Suitable range |
|---|---|---|
| 0.001 mol/L KCl | about 147 µS/cm | Low range |
| 0.01 mol/L KCl | 1,413 µS/cm | Mid range (most common) |
| 0.1 mol/L KCl | 12.88 mS/cm | High range |
Low ranges (for example 0–50 µS/cm) need a dilute standard below full scale; confirm the calibration procedure with the manufacturer.
Points to observe during verification:
- Let the standard stabilize near 25 °C, or use a standard with temperature correction.
- Rinse the probe with clean water and blot it dry with a soft cloth; do not scratch the graphite electrodes.
- Immerse the probe completely, with no bubbles around the electrodes.
- Record the reading only after it stabilizes, usually tens of seconds to a few minutes.
6.2 Temperature Compensation Settings
Confirm that the temperature compensation coefficient set in the instrument matches the water body; about 2% per °C is the common industry value. Ultrapure water, strong acids and bases, and high-salinity water can differ substantially from typical surface water, so determine the coefficient from a representative sample where necessary.
6.3 Cleaning Frequency
Cleaning frequency depends on water quality:
| Water quality | Inspection interval | Cleaning interval |
|---|---|---|
| Clean freshwater, drinking water | 1–3 months | 3–6 months |
| Aquaculture water, surface water | 2–4 weeks | 1–3 months |
| Municipal wastewater, aeration tank | 1–2 weeks | 2–4 weeks |
| Heavy scaling, high suspended solids | Weekly | 1–2 weeks |
Cleaning method: rinse with clean water, wipe the electrodes gently with a soft brush or cloth, soak briefly in dilute hydrochloric acid for stubborn scale (only where compatible with the wetted materials and approved by RIKA) and rinse thoroughly afterwards, then air-dry or blot dry. Never scrape the graphite electrode surface with a hard object.
6.4 Troubleshooting
| Symptom | Possible cause | Action |
|---|---|---|
| Reading frozen at a fixed value | Probe not immersed, broken wiring, wrong range setting | Check immersion depth and wiring; verify the range |
| Reading low and unstable | Small bubbles clinging to the electrodes | Change the mounting angle or position; vent the air |
| Reading falls slowly | Fouling or polarization | Clean the electrodes and re-verify |
| Reading high | Contaminated standard, wrong temperature compensation | Replace the standard; check the compensation coefficient |
| 4–20 mA output jitters | Poor grounding, interference from power cables | Ground the shield at one end; separate signal and power routing |
| Large gap versus the laboratory result | Different sampling time or location; TDS factor misapplied | Sample simultaneously; confirm you are comparing conductivity, not TDS |
7. Typical Applications
Aquaculture. Conductivity reflects the salinity and total ionic content of the water and is used to decide water exchange, salt adjustment and source-water changes. The graphite electrodes of model C resist corrosion and suit long-term immersion in culture water; in recirculating systems the 4–20 mA output can feed aeration and make-up water controls.
Municipal and industrial wastewater. A sudden rise in conductivity at the inlet may indicate a change in dissolved ionic content, for example a high-salinity stream entering the sewer. It is a useful early warning, but additional measurements and a site investigation are needed to establish the cause. Continuous data from the aeration tank and the outfall support process adjustment and compliance checks.
Source water and rivers. Once a baseline is established, a sustained deviation in conductivity can point to seawater intrusion, mine drainage or agricultural non-point pollution. Model B suits this kind of long-term deployment.
Environmental monitoring networks and remote stations. With power consumption below 0.2 W and a 7–30 VDC wide-range supply, the sensor is well suited to unattended solar-plus-battery stations; RS485 can feed a DTU directly to the cloud.
Food, beverage and pharmaceutical. The 316L + PEEK construction, 0–100 °C compensation and clamp connection of model D cover cleaning-solution concentration, CIP process water and product-line conductivity monitoring.
Oil and gas pipeline corrosion monitoring. Model C can monitor the conductivity of the medium in a pipeline bypass, alongside corrosion-rate assessment.
8. Frequently Asked Questions
Is conductivity the same as TDS?
No. Conductivity is an electrical measurement; TDS is a mass concentration of dissolved solids. The two are converted with an empirical factor (TDS ≈ EC × 0.55–0.7) that changes with water composition, and an accurate TDS value requires the gravimetric evaporation method.
Why does the same water body read so differently at different times?
Rule out temperature first: without 25 °C compensation, the day–night temperature difference alone can move the reading by more than 5%. Then check for bubbles and fouling, and whether the sampling point is affected by tides, discharge or rainfall.
Does the sensor need temperature compensation, and to what temperature?
Yes. The industry compensates to 25 °C so that results are comparable. The RK500-13 has built-in automatic temperature compensation: 0–60 °C on models A, B and C, and 0–100 °C on model D.
Should I choose 0–2,000 or 0–20,000 µS/cm?
A practical starting point is 1.5–2 times the expected maximum. The accuracy is ±1% FS, so the wider range carries the larger absolute error: about ±20 µS/cm on 0–2,000 and about ±200 µS/cm on 0–20,000.
Can it measure seawater?
Full-strength seawater conducts at about 50 mS/cm, which exceeds the standard 20 mS/cm range of the RK500-13 and falls outside its standard application boundary; type C supports additional custom ranges on request, subject to technical confirmation. Estuarine and brackish water below 20 mS/cm can be measured; model C is the usual choice, provided the actual peak is confirmed. For continuous full-salinity seawater, use a four-electrode or toroidal instrument with a wider range.
Can the 4–20 mA and RS485 outputs be used at the same time?
Yes. The RK500-13 supports both outputs simultaneously: the analog signal can go to a PLC input card while the digital signal goes to an RTU or DTU, so each acts as a backup for the other.
How often should the probe be cleaned?
It depends on the water: every 3–6 months in clean water, every 1–3 months in aquaculture water, every 2–4 weeks in wastewater, and every 1–2 weeks in heavily scaling water. Inspect immediately if the reading drifts or falls.
Can it be installed in a pipe, and what should I watch out for?
Yes, using the NPT3/4 thread. Watch three things: avoid the turbulence downstream of pumps and valves; mount on the side or lower side of a horizontal run so air cannot collect at the top; and make sure the electrodes are fully immersed with a reasonable straight run upstream and downstream.
Is an external transmitter required?
No. The RK500-13 is an integrated design: signal processing and output circuitry are built into the sensor, which outputs 4–20 mA and RS485 directly.
What does ±1% FS mean exactly?
FS means full scale. An accuracy of ±1% FS is referenced to the top of the range, not to the current reading. On a 0–2,000 µS/cm range the maximum error is about ±20 µS/cm, and the same ±20 µS/cm applies at an 800 µS/cm reading.
9. Selection Checklist
Confirm these eight points before ordering; they prevent most rework:
- Water type and corrosivity (freshwater / wastewater / aquaculture / food)
- Expected conductivity range and peak value (this sets the range)
- Maximum operating temperature (above 60 °C or not)
- Long-term operating pressure (above 1.6 MPa or not)
- Mounting method (immersion / in-line / clamp) and thread specification
- Output requirement (4–20 mA / RS485 / both)
- Power supply (24 VDC / solar)
- Cable length (5 m standard, or longer)
Ordering code example: RK500-13BAN5000 is a model B standard unit, 7–30 VDC supply, without mounting bracket, with a 5 m cable.
Sources & references
- Rika Sensor, RK500-13 EC Sensor Specification V5.0 (PDF), 25 April 2025.
- U.S. EPA, Secondary Drinking Water Standards: Guidance for Nuisance Chemicals. epa.gov
- Fondriest Environmental, Conductivity, Salinity & Total Dissolved Solids. fondriest.com
- YSI / Xylem, Conductivity in Water, Salinity and Specific Conductance Measurement. ysi.com
- Hanna Instruments, What types of conductivity probes are there? hannainst.com
- USGS, Field Manual, Chapter 6.3: Specific Conductance. usgs.gov
Water Conductivity Monitoring with RIKA SENSOR
RIKA SENSOR provides online conductivity sensing solutions for water-quality and industrial monitoring applications.
The RK500-13 conductivity sensor series includes immersion, threaded and hygienic clamp configurations for conventional water, wastewater, aquaculture, source water and food-grade applications, depending on the version selected.
For project selection, it helps to provide: water type, expected conductivity range, operating temperature and pressure, installation method, required output and application environment.
Looking for an Industrial Conductivity Sensor?
The RIKA SENSOR RK500-13 series offers configurations with graphite or 316 stainless steel electrodes, as well as a Type D construction using 316L stainless steel and PEEK, with internal signal isolation, IP68 probe protection and simultaneous 4–20 mA and RS485 outputs.
Tell us about your application, water conditions, expected conductivity range, installation method, process temperature, pressure and communication requirements.
