Overview
The ELIT-ORP-31C is designed for general ORP (Oxidation-Reduction Potential) measurements in laboratory, field, and light industrial environments where the electrode is not submerged or operated under pressure. Its rugged gel-filled plastic body and integrated Ag/AgCl reference make it straightforward to use with any BNC-equipped meter or analyser.
Specifications
| Parameter | Value |
|---|---|
| Body Dimensions | 12 × 120 mm |
| Body Material | Plastic, gel-filled (sealed) |
| Sensing Element | Platinum rod |
| Reference System | Ag/AgCl in saturated KCl gel |
| Reference Offset | ~200 mV vs Standard Hydrogen Electrode Eh = Emeasured + ≈200 mV |
| Cable / Connector | 1 m (optional 3 m), BNC |
| Temperature Range | 0 °C to 80 °C |
| Protective Skirt | Yes |
| Temperature Compensation | None (ORP measurements are temperature-dependent) |
Applications
Aquaria
Aquaculture
Swimming Pools
Ponds
Water Quality
Disinfection
Corrosion Measurement
Cooling Towers
Pollution Control
Pulp Bleaching
Wastewater Treatment
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Order at elyxir.co.uk/products/sensors
For continuous real-time monitoring, explore ELIT analysers and monitors at elyxir.co.uk/products
For continuous real-time monitoring, explore ELIT analysers and monitors at elyxir.co.uk/products
Preparation & Operating Instructions
- Remove the protective storage bottle and keep it for future storage.
- Rinse any salt deposits from the electrode tip with distilled water.
- Connect the BNC connector to your meter or analyser.
- Allow a short stabilisation period before recording measurements.
ORP measurements are temperature-dependent. No automatic temperature
compensation is available — record sample temperature alongside readings
where accuracy is critical.
Understanding ORP Values
ORP (Oxidation-Reduction Potential) indicates the oxidising or reducing capacity of a solution. A higher reading indicates more oxidising agents present.
| Application | Typical ORP Range |
|---|---|
| Freshwater aquarium | 250–300 mV |
| Saltwater aquarium | 350–400 mV |
| Aquarium — harmful for fish | > 400 mV |
| Pond — good water quality | ~300 mV |
| Pond — decomposing organics | < 150 mV |
| Pond — chlorine / cleaning agents | > 450 mV |
| Swimming pool (ideal, pH 7.2) | ≥ 700 mV |
Maintenance & Storage
- Storage: Keep the electrode in the protective storage bottle filled with saturated KCl solution when not in use.
-
Cleaning:
- Non-organic contamination: soak in 0.1 M HCl for 10 minutes.
- Organic / oily contamination: soak in 1:10 diluted detergent for 10 minutes.
- After any chemical cleaning: re-soak in saturated KCl for 3 hours.
- Reference clogging: The Ag/AgCl reference may become clogged when used in samples containing TRIS buffer, proteins, or sulfides.
Performance Verification
| Test Solution | Expected Response |
|---|---|
| pH 7 buffer + Quinhydrone | 86 ± 15 mV |
| pH 4 buffer + Quinhydrone | 263 ± 15 mV |
| ZoBell's solution (25 °C) | 238 mV |