The ST-765SS Series are stainless steel multi-parameter membrane-less sensors based on unique electrochemical principles to determine free chlorine or chlorine dioxide and pH content in water. These sensors incorporate Pyxis Lab® advanced technology in the field of bare-gold electrochemical detection. The ST-765SS-FLC sensor integrates Free Chlorine, plus pH measurement while the ST-765SS-CLO integrates Chlorine Dioxide plus pH measurement. Both can perform temperature and pH compensation for the measurement of Free Chlorine or Chlorine Dioxide based on the conditions present in the application of use. This unique internal compensation results in a highly accurate oxidizer measurement consistent with DPD wet chemistry methodology as high as a pH of 9.0 and is compliant with USEPA-334.0 & ISO-7393 guidelines.
The ST-765SS Series sensors offer a replaceable, front-loading reference electrode assembly that has been independently developed by Pyxis Lab®, eliminating the shortcomings associated with membranes and gel replacement while offering reduced polarization time on startup, offering an electrode life span potential of up to 2 years. The flat front-end design of the ST-765SSS series makes this platform less prone to contamination or fouling and is easy to clean. The ST-765SS Series sensor body is composed of 304 Stainless Steel and is well suited for aggressive environments.
The ST-765SS Series offer (2) 4-20mA and RS-485 Modbus outputs and is Bluetooth® 5.0 enabled when used with the MA-CR Bluetooth® adapter. The world’s first four-electrode composite sensor that provides three measured parameters including Free Chlorine or Chlorine Dioxide, pH and Temperature with one sensor RS-485 Modbus output. The ST-765SS is the best choice for potable water, secondary water supply, domestic water, decorative water and other clean water applications.
Features
Specifications
| Item | ST-765SS-SO3 |
| Part Number | 53624 |
| Sensor Body Material | 304SS |
| Sulfite Standard Range | 0.00-5.00 ppm Sulfite (Factory Standard Range – Adjustable via uPyxis) |
| Sulfite Precision | ± 0.01mg/L or 1% of the value w/pH compensation up to 9.0+ |
| Sulfite Maximum Range | 0-100 ppm Sulfite (Adjustable via uPyxis 4-20mA SPAN ADJUST) |
| Sulfite Maximum Precision | ± 1 mg/L or 1% when in MAX SPAN Mode |
| pH Range | 0-14 |
| pH Precision | ±0.01 pH |
| Sample Inlet Pressure | 7.25 – 30 psi (0.05 – 0.2MPa) |
| Installation | ST-007 Stainless Steel Flow Cell Assembly (Sold Separately) |
| ST-007 Minimum Flow Rate | 200 mL/minute |
| ST-007 Maximum Flow Rate | 400 mL/minute |
| ST-007 Sample Inlet | ¼ - inch OD |
| ST-007 Sample Outlet | ¼ - inch OD |
| Power Supply | 22 – 26VDC, Power Consumption 2W |
| Storage Temperature | -7 °C – 60 °C (20 – 140 °F) |
| Outputs | Dual Isolated 4 – 20 mA Analog Outputs + Isolated RS-485 Digital Output |
| Dimension (L x D) | Length 8.3 inch (210.8 mm), body diameter 1.4 Inch (35.6 mm) |
| Weight | 530 g (1.16lbs) |
| Maximum Sensor Pressure | 100 psi (6.9 Bar) – Sensor Only |
| Operating Temperature | 4 °C – 49 °C (40 – 120 °F) |
| Wet Material | UPVC |
| Rating | IP67, Fully Dustproof & Waterproof |
| Selectivity | Non-Selective / Cross Sensitive to other Reducing Species |
| Compliance | EPA 334.0 / ISO 7393 |
| Regulation | CE Marked / RoHS |
| Cables Included | MA-4.9CR Cable (8Pin Adapters – 4.9ft) MA-1.5CR Cable (8 Pin Adapter / Flying Leads – 1.5ft) |
| Typical Electrode Service Life | 2 Years |
| Electrode Warranty | 6 Months |
| Sensor Body Warranty | 13 Months |
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