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ST-766SS Series Oxidizer, pH, ORP & Conductivity Sensors
- Product Details
- Specifications
- Cooling, Process & Drinking Water
ST-766SS Series Oxidizer, pH, ORP & Conductivity Sensors
The Pyxis ST-766SS is one stainless steel inline sensor that measures a disinfectant together with pH, ORP, conductivity and temperature. Each model is set up for one oxidiser (or, in the sulfite models, a reducing agent), and uses the pH and temperature it measures to correct that reading automatically.
There are no membranes, no electrolyte gel and no reagents. The sensor reads continuously, needs no burn-in period, and sends its results through two 4–20 mA outputs and RS-485 Modbus. Set-up and calibration can be done wirelessly through the uPyxis® app with an MA-CR or PowerPACK Bluetooth® adapter.
Models
- Chlorine: FCL (free), TCL (total), TFCL (free and total together), NCL (monochloramine)
- CLO (chlorine dioxide), Br (bromine), O3 (ozone)
- H2O2 (hydrogen peroxide), PAA (peracetic acid), DBNPA
- SO3 (sulfite), and DCL (free chlorine and sulfite, for dechlorination)
Replaceable Electrode Head
The measuring electrodes sit in a front-loading EH-766 head with a flat face that resists fouling and wipes clean. When it wears out, typically after about two years, the head is swapped on site and the sensor body stays in service.
ST-766SS Series Specifications
| Item | ST-766SS Series |
|---|---|
| pH / Temperature Compensation | Automatic, up to pH 9.0 |
| Lower Detection Limit | As low as 0.001 ppm (adjustable sensitivity) |
| pH Range / Precision | 0.00 – 14.00 pH; ±0.01 pH |
| ORP Range / Precision | -1,500 to +1,500 mV; ±1.0 mV |
| Conductivity Range / Precision | 0 – 10,000 µS/cm; ±5% of reading |
| Temperature | Built-in RTD |
| Measurement | Continuous |
| Response Time | T95 240 s for the oxidiser; T95 5 s for pH, ORP and conductivity |
| Sample Temperature | 4 – 49 °C (40 – 120 °F) |
| Sample Inlet Pressure | 0.05 – 0.6 MPa (7.25 – 87 psi) |
| Outputs | Two 4–20 mA and RS-485 Modbus, 8-pin connector |
| Wireless Access | Bluetooth® 5.0 via MA-CR or PowerPACK adapter, uPyxis® app |
| Power Supply | 22 – 26 V DC, about 2 W |
| Sensor Body | 316L stainless steel |
| Protection | IP67 |
| Selectivity | Non-selective; cross-sensitive to other oxidising species |
| Reference Methods | US EPA 334.0 / ISO 7393 |
| Approvals | CE, RoHS, UKCA |
| Mounting (sold separately) | Clean water: FR-50 flow reservoir, ST-007 or ST-009 stainless steel tee. Dirty water: FR-306 PLUS self-brushing flow reservoir |
| Cables Included | MA-1.5CR 1.5 m flying lead cable; MA-4.9CR 1.5 m bulkhead cable |
| Typical Electrode Life | 2 years |
| Warranty | Electrode 6 months; sensor body 13 months |
ST-766SS Models
| ST-766SS Model | Measures | Range | Precision | Electrode Head | 4–20 mA Outputs | Part Number |
|---|---|---|---|---|---|---|
| FCL | Free chlorine | 0.00 – 5.00 ppm | ±0.01 mg/L or ±1% | EH-766 | Free chlorine, pH | 51154 |
| CLO | Chlorine dioxide | 0.00 – 5.00 ppm | ±0.01 mg/L or ±1% | EH-766 | Chlorine dioxide, pH | 55821 |
| TCL | Total chlorine | 0.00 – 5.00 ppm | ±0.01 mg/L or ±1% | EH-766 | Total chlorine, pH | 51379 |
| NCL | Monochloramine | 0.00 – 5.00 ppm | ±0.01 mg/L or ±1% | EH-766 | Monochloramine, pH | 54731 |
| TFCL | Free + total chlorine | 0.00 – 5.00 ppm | ±0.01 mg/L or ±1% | EH-766-01 | Total chlorine, free chlorine | 55659 |
| O3 | Ozone | 0.00 – 2.00 ppm | ±0.01 mg/L or ±1% | EH-766-03 | Ozone, pH | 54828 |
| Br | Bromine | 0.00 – 5.00 ppm | ±0.01 mg/L or ±1% | EH-766 | Bromine, pH | 52743 |
| H2O2 | Hydrogen peroxide | 0.00 – 200.00 ppm | ±0.5 mg/L or ±1% | EH-766 | Hydrogen peroxide, pH | 53302 |
| PAA | Peracetic acid | 0.00 – 100.00 ppm | ±0.5 mg/L or ±1% | EH-766-01 | Peracetic acid, pH | 54803 |
| SO3 | Sulfite | 0 – 100 ppm | ±0.5 mg/L or ±1% | EH-766 | Sulfite, pH | 58305 |
| DCL | Free chlorine + sulfite | Free chlorine 0.00 – 5.00 ppm; sulfite 0 – 100 ppm | Free chlorine ±0.01 mg/L or ±1%; sulfite ±0.5 mg/L or ±1% | EH-766-01 | Free chlorine, sulfite | 57300 |
| DBNPA | DBNPA | 0 – 20 ppm | ±0.05 mg/L or ±1% | EH-766 | DBNPA, pH | 50484 |
Ideal for Cooling, Process & Drinking Water
Wherever a disinfectant has to be held at the right level, the ST-766SS shows the dose and the water conditions that affect it in one reading. It is used in cooling water, drinking water, RO feedwater, wastewater effluent, irrigation and industrial process water, and in food and beverage plants for wash water, flumes, conveyors and equipment sanitising. Clean water installs in an FR-50 flow reservoir or ST-007/ST-009 stainless steel tee; dirty water uses the self-brushing FR-306 PLUS.
Key Features
- Oxidiser plus pH, ORP, conductivity and temperature from one sensor
- Twelve models covering chlorine, chlorine dioxide, bromine, ozone, peroxide, peracetic acid, DBNPA and sulfite
- Automatic pH and temperature compensation of the oxidiser reading, up to pH 9.0
- No membranes, gels or reagents; no burn-in time
- Adjustable sensitivity, with a lower detection limit as low as 0.001 ppm
- Replaceable EH-766 electrode head, typical life about two years
- Flat front face that resists fouling and is easy to clean
- Two 4–20 mA outputs and RS-485 Modbus
- Bluetooth® set-up and calibration through the uPyxis® app
- 316L stainless steel body, IP67
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