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ST-723 High Temperature Conductivity Sensor
- Product Details
- Specifications
- Boilers & Process Water
ST-723 High Temperature Conductivity Sensor
The Pyxis ST-723 is an inline conductivity sensor built for hot, pressurised water. It reads boiler water and other process samples directly at up to 200 °C and 20.6 bar (300 psi), across a range of 0 – 20,000 µS/cm.
It is a smart sensor with its own transmitter: a two-pole Hastelloy electrode, a built-in PT-100 for temperature, and two 4–20 mA outputs (conductivity and temperature) plus RS-485 Modbus, so it connects straight to a boiler controller, PLC or DCS. Calibration and set-up are done wirelessly from a phone or computer with the MA-CR Bluetooth® adapter and the uPyxis® app.
Cooling Fins Protect the Electronics
A finned 316L stainless steel section sits between the wetted electrode head and the electronics. It sheds heat before it reaches the transmitter, which is what lets the sensor sit in water at boiler temperatures and still give a stable reading.
ST-723 Specifications
| Item | ST-723 |
|---|---|
| Part Number | 53106 |
| Conductivity Range | 0 – 20,000 µS/cm |
| Conductivity Precision | ±10% or ±3.5% of full scale, whichever is greater |
| Resolution | 0.1 µS/cm |
| Lower Detection Limit | 1 µS/cm |
| Cell Constant | K = 0.3 |
| Electrode | Two-pole, Hastelloy |
| Temperature Sensor | Built-in PT-100 |
| Temperature Range | 0 – 200 °C (32 – 392 °F) |
| Temperature Compensation | Automatic (ATC) on or off; user-defined coefficient |
| Operating Temperature | 5 – 200 °C (41 – 392 °F) |
| Storage Temperature | -20 – 200 °C (-4 – 392 °F) |
| Sample Pressure | Up to 20.6 bar (300 psi) at 199 °C (390 °F) |
| Outputs | Two 4–20 mA (conductivity and temperature) and RS-485 Modbus, 8-pin connector |
| 4–20 mA Factory Scaling | Conductivity 0 – 20,000 µS/cm; temperature 0 – 200 °C (32 – 392 °F); adjustable |
| Configuration & Calibration | MA-CR Bluetooth® adapter with uPyxis® 2.0 mobile or desktop app |
| Power Supply | 24 V DC, 2 W |
| Installation | ¾" NPT |
| Materials | Electrode: Hastelloy; body: 316L stainless steel and PEEK; O-ring: perfluoroelastomer |
| Protection | IP67 electrode head; IP65 enclosure and cooling fins |
| Dimensions (L × D) | 273 mm × 52 mm (10.74" × 2.05") |
| Weight | 1.1 kg (2.4 lb) |
| Cables Included | 1.5 m 8-pin bulkhead cable; 1.5 m 8-pin flying lead cable |
| Approvals | CE, RoHS, UKCA |
| Warranty | 13 months |
Ideal for Boilers & Process Water
Conductivity tells a boiler operator how much dissolved solids the water is carrying, and therefore when to blow down. The ST-723 is made for boiler feedwater, blowdown and condensate, and for timed-capture samples taken straight from a pressurised boiler, as well as for cooled samples measured continuously. It suits any other process line where the water is too hot or under too much pressure for an ordinary conductivity sensor.
Key Features
- Measures 0 – 20,000 µS/cm, with 0.1 µS/cm resolution
- Samples up to 200 °C (392 °F) and 20.6 bar (300 psi)
- Two-pole Hastelloy electrode for long-term stability
- Integrated cooling fins between electrode and electronics
- Built-in PT-100 temperature measurement
- Automatic temperature compensation on or off, with a user-set coefficient
- Two 4–20 mA outputs and RS-485 Modbus, for any controller, PLC or DCS
- Wireless calibration and trending with the MA-CR Bluetooth® adapter and uPyxis® app
- 316L stainless steel and PEEK body, ¾” NPT installation
- Factory calibrated; 24 V DC, 2 W
