Product details
4-Electrode Conductivity Sensor — POM Body for Wastewater
The InstroDirect IDC-4E-POM POM-Body 4-Electrode Conductivity Sensor is a four-electrode conductivity probe in a POM (polyoxymethylene) plastic body, engineered for wastewater, aquaculture salinity, and industrial rinse water where biofouling and high conductivity would defeat a traditional 2-electrode design. The four-electrode arrangement eliminates polarisation errors and tolerates light fouling without drift.
Technical Specifications
| Parameter | Specification |
|---|---|
| Measurement method | 4-electrode graphite contacting |
| Conductivity range | 0 – 2000 mS/cm |
| Cell constant (K) | K = 0.6 (cm⁻¹) |
| Accuracy | ±1% of reading |
| Temperature measurement | Integrated Pt1000 / Pt100 |
| Operating temperature | 0 – 60 °C |
| Pressure rating | ≤ 4 bar |
| Output signal | RS485 Modbus RTU + Pt1000 |
| Body / wetted materials | POM engineering plastic body, graphite electrodes, slotted protective cage |
| Process connection | Cable-drop submersible (optional 3/4″ NPT adapter) |
| Ingress protection | IP68 |
| Cable | 5 m IP68 submersible cable |
| Warranty | 12 months, Australian-backed |
Typical Australian Applications
- WWTP influent and effluent EC / TDS
- Aquaculture salinity monitoring
- Industrial rinse water and wash-down
- Leachate monitoring at waste transfer stations
- Landfill gas condensate
Why Integrators Choose the IDC-4E-POM
- 4-electrode design is immune to polarisation at high EC and to mild electrode coating
- POM plastic body resists corrosion from chlorides and sulphides in wastewater
- Wide 0–2000 mS/cm range covers brine, seawater, and industrial effluent
- Slotted cage protects electrodes from debris while maintaining flow
- Lighter than stainless — ideal for suspended or float-mounted deployments
Installation & Calibration Notes
Can be suspended on its cable or threaded into a 3/4″ NPT boss with the optional adapter. Keep away from metal structures (earth loops degrade reading). Calibrate monthly with 12.88 mS/cm KCl standard.
Frequently Asked Questions
Why 4-electrode instead of 2-electrode for wastewater?
High-conductivity media (>20 mS/cm) cause polarisation in 2-electrode probes, which produces drift. 4-electrode probes inject current on one pair and measure voltage on another, eliminating polarisation and tolerating mild fouling.
Is POM plastic chemically resistant?
POM handles chlorides, dilute acids and bases, and most wastewater chemistries. For strong acids or solvents, see the PEEK-body alternative (IDC-M12-PEEK).
Can it measure seawater?
Yes. Seawater is approximately 50 mS/cm which is well within the 0–2000 mS/cm range. For salinity calculations we provide a conversion factor on request.
Australian Technical Support, Calibration & Consumables
- Phone and email technical support from Brisbane-based field engineers with 20+ years automation experience
- On-site two-point conductivity calibration across QLD, NSW, VIC with certificate of calibration
- KCl calibration solutions (1413 µS/cm, 12.88 mS/cm, 111.8 mS/cm) stocked locally
- Replacement electrodes and O-rings for extended service life — dispatched same business day ex Brisbane
- Next-day delivery across Australia for stock items; trade pricing from 5 units
InstroDirect also stocks the full water-analysis reagent range for pH, dissolved oxygen, chlorine, ammonia, and nitrate monitoring.
Request a Trade Quote
Panel builders, system integrators, council water departments, food & beverage engineers, and pharma/process teams get volume trade pricing. Submit a quote request and we’ll respond within one business day with stock, pricing, and lead time.
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