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ST-710SS Series pH and ORP Sensor
- Product Details
- Specifications
- Data Centre Cooling
ST-710SS Series Inline pH & ORP Sensors
Rugged Stainless Steel Sensors with Replaceable Electrode Heads
The Pyxis ST-710SS series provides reliable inline measurement of pH and ORP for demanding industrial water treatment applications, including process water, cooling water, wastewater and data centre cooling systems.
Three models are available:
- ST-710SS – pH
- ST-711SS – ORP
- ST-712SS – pH & ORP
Each sensor features a built-in transmitter, eliminating the need for a separate preamplifier or meter head. The sensors connect directly to controllers, PLCs or DCS systems via isolated 4–20 mA or RS-485 Modbus.
Replaceable Electrode Head
The electrode, electrolyte and reference junction are contained in a replaceable head assembly. When maintenance is required, the head can be replaced without replacing the stainless steel sensor body, reducing maintenance time and ongoing costs.
The sensors feature an enlarged salt bridge for increased electrolyte capacity and an enlarged platinum ORP disk for reliable performance in demanding water conditions.
ST-710SS Series Specifications
| Item | ST-710SS | ST-711SS | ST-712SS |
|---|---|---|---|
| Measures | pH | ORP | pH & ORP |
| Part Number | 53030 | 53031 | 53032 |
| pH Range | 0.00 – 14.00 with ATC | – | 0.00 – 14.00 with ATC |
| pH Precision | ±0.01 pH or 1% of the value | – | ±0.01 pH or 1% of the value |
| ORP Range | – | ±1,500 mV | ±1,500 mV |
| ORP Precision | – | ±1 mV or 1% of the value | ±1 mV or 1% of the value |
| Response Time | 95% within 5 seconds | ||
| Outputs | Isolated 4 – 20 mA analogue and isolated RS-485 Modbus | ||
| Power Supply | 22 – 26 V DC, 2 W | ||
| Operating Temperature | 4 – 49 °C (40 – 120 °F) | ||
| Storage Temperature | −7 – 60 °C (20 – 140 °F) | ||
| Operating Pressure | 6.9 bar (100 psi) | ||
| Body Material | 304 stainless steel | ||
| Wetted Materials | Quartz & uPVC | ||
| Rating | IP67, fully dustproof & waterproof | ||
| Dimensions (L x D) | 172.7 mm long, 36.6 mm body diameter | ||
| Weight | 530 g | ||
| Installation | ST-001 inline tee (provided), ¾" FNPT, glue & thread | ||
| Cables | MA-4.9CR: 8-pin male/female adapters, 1.5 m MA-1.5CR: 8-pin male adapter to flying leads, 0.46 m Extension cables available |
||
| Typical Electrode Life | 2 years | ||
| Warranty | Electrode 6 months; sensor body 13 months | ||
| Regulation | CE marked | ||
Ideal for Data Centre Cooling
The ST-710SS series is well suited to data centre cooling applications, providing continuous monitoring of water quality in condenser water and technology cooling loops.
With 24 V DC operation, low power consumption, stainless steel construction and direct integration with plant control systems, the sensors are designed for reliable operation in critical cooling systems.
Key Features
- Replaceable electrode head
- Stainless steel 304 body
- Built-in transmitter
- pH range: 0–14
- ORP range: ±1,500 mV
- Isolated 4–20 mA and RS-485 Modbus
- Water temperature measurement via Modbus
- Low drift and stable measurement
- Enlarged salt bridge for extended electrode life
- Enlarged platinum ORP disk
- IP67 rated
- Wireless calibration, diagnostics and data trending via the uPyxis® app with MA-CR adapter
- Suitable for inline or submersion installation