ST-730 Series are designed for monitoring the middle range turbidity in various applications. It is more robust and tolerant to fouling, particular matters, and air bubbles comparing to other online turbidity meters designed for relatively clean water applications.
It also offers desired resolution and accuracy comparing to high turbidity or commonly referred to as suspended solid meters (4000 to 9999 NTU).
ST-730 series turbidity probe measures two optical densities and two scattering intensities at two wavelengths. This helps measure a large turbidity range and yet maintain a fine resolution. This design also helps the probe run self-diagnoses.
Typical Applications
- Industrial water treatment process control, including raw water, cooling water, and wastewater.
- Surface water monitoring.
- Other chemical processes with middle range of turbidity.
Features
- Dual-wavelength: white LED and IR LED 90° scattering to achieve more reliable and accurate reading in a complex flow system.
- A small footprint compact design, similar to an industrial pH probe.
- Isolated 4-20mA output. No need for additional transmitter for easy connection to PLC and DCS.
- Isolated RS-485 output embedded for easy trouble shooting and calibration.
Specifications
| ST-730 | ST-731 | ST-730B | ST-735 | |
|---|---|---|---|---|
| Range | 0~100 NTU | 0-10 NTU | 0~500 NTU | 0~4,000 NTU |
| Resolution | 0.1 NTU | 0.05 NTU | 1 NTU | 10 NTU |
| Accuracy | ±2% of reading or 1 NTU whichever is greater | |||
| Method | Nephelometric, with light sources of White LED and IR LED (860nm) | |||
| Power Supply | 22-26V DC, Power Consumption ~1W | |||
| Outputs | Isolated 4-20mA Analog Output Isolated RS-485 Digital Output, Supporting MODBUS protocol |
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| Dimension | Length 6.8 inch, body diameter 1.44 inch | |||
| Weight | 0.37 pounds | |||
| Installation | Custom tee with 3/4” NPT ports | |||
| Material | CPVC | |||
| Pressure | Up to 100 psi | |||
| Temperature | Operation 40-120 °F, Storage 20~140 °F | |||
| Cable Length | 5 feet, terminated with IP67 connectors. 30 feet, 60 feet extension cables available |
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| Calibration | Two point calibration against standard solutions | |||
| Rating | IP66 | |||
| Regulation | CE marked | |||
Related products
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Handheld Devices
ST-500 Series Inline Fluorometers
The popular ST-500 inline fluorometer is a robust and highly accurate tool for real-time monitoring of inhibitor dose. It is often used for feedback control to maintain dosed concentration within a narrow band around the set point, regardless of changes in cycle or heat load dynamics.
Now the ST-500 series includes expanded measurement targets for a broad range of analytes, including fluorescein and naphthenic disulfonic acid (NDSA), and brings its proven record of reliability to your traced cooling programs for boiler and other applications.
Thanks to its state-of-the-art fluorescence technology, the ST-500 Series handles a wide range of real-world sample water conditions. With its flow-through optical design and multiple wavelength color-turbidity compensation algorithm, the ST-500 probe maintains high performance for water samples with up to 100 NTU turbidity and/or 5 ppm iron.
The competitive probe comparison shown in the experiment below clearly demonstrates the superior performance of the ST-500 probe in the presence of iron color.
Typical Applications
- Traced cooling water treatment programs
- Traced boiler water treatment programs
Features
- Color and turbidity compensation for accurate readings, long-term stability, and less frequent calibration.
- Typical maintenance cycle in months, not weeks or days.
- Works with WiFi and Bluetooth adapters for one-press calibration with the SP-910, 700, and 400 tools, and for firmware upgrades via your smart phone.
- Isolated 4-20mA output: no need for additional transmitter for easy connection with PLC and DCS.
Specifications
ST-500(1) ST-525/ST-525SS(2) ST-540 P/N 50661 50665
50666 for SS50667 Target PTSA Fluorescein NDSA Range 0~200 ppb 0~60 ppb 0~100 ppb Resolution 0.1 ppb Accuracy ±1% of reading or 1 ppb , whichever is greater Method UV Fluorescence Power Supply 22~26V DC,Power Consumption ~1W Outputs Isolated 4-20mA Analog Output
Isolated RS-485 Digital Output
Supporting MODBUS protocolDimension Length 6.8 inch, diameter 1.44 inch
525SS: 8.3 x 2.25 x 1.75 inchWeight 0.37 lbs (525SS: 3.2 lbs) Installation Custom tee with 3/4″NPT ports Housing Material CPVC/stainless steel Pressure Up to 100 psi Temperature Operation 40~120℉,Storage 20~140℉ Cable Length 5 feet,terminated with IP67 connectors
30 feet, 60 feet extension cables availableCalibration Two point calibration against standard solutions Rating IP66 Regulation CE marked - Camlock version available.
- Stainless housing version available.Check www.pyxis-lab.com
PYXIS INLINE PROBES – SELECT*A*GUIDE Functional Capability ST500 ST500SS ST500RO ST525 ST525ss ST540SS ST565 EM500 PTSA (0-300ppb) For Cooling ● ● PTSA (0-10ppb) For RO ● Fluoroscein (0-60ppb) For Process ● Fluoroscein (0-60ppb) For Boiler ● NDSA (0-100ppb) For Boiler ● HST (0-5ppm) For Cooling ● Chlorophyll-a (0-1000ppb) For Cooling ● Modbus RS 485 Output ● ● ● ● ● ● ● ● Analog 4-20mA Output ● ● ● ● ● ● ● ● MA-485WB Adapter Required For BlueTooth & Wifi Communication ● ● ● ● ● ● ● ● 
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Handheld Devices
CR-200 Corrosion Rate Probes
Corrosion Rate Probes
- Easily Deployable
- Bluetooth Communication
- Battery Powered
- Minimal maintenance
CR200 = Connected to uPyxis App or BTA100 Single Display
LPR CORROSION SENSORS From Pyxis
CR200– LPR Corrosion Sensors
CR200 = Lithium Battery & BlueTooth Output
0.001 – 10 mpy
Easy Data download via our uPyxis App
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Handheld Devices
SP-700 Water Multimeter
The Pyxis SP-700 handheld multimeter measures six key water treatment parameters simultaneously: pH, conductivity, PTSA, fluorescein, ORP, and temperature. Featuring simple, one-handed operation, the multimeter leverages Pyxis proprietary technology combining electrochemical and optical measurements in a cuvette-less platform.
With the SP-700, you can view results in under a minute for all key parameters for a typical water treatment application such as cooling tower analysis. The multimeter logs a complete measurement history, which you can transfer via Bluetooth to your smart phone or PC for statistical analysis.
Custom product names and tracer/product ratios can be configured via Bluetooth-enabled devices.
For highest accuracy, the PTSA measurement uses our proprietary signal processing algorithms to compensate for sample color and turbidity conditions, which would otherwise cause erroneous readings.
SP-700 Features
- Breakthrough technology combines PTSA / fluorescein with conductivity / pH and ORP in a single, rugged one-handed meter.
- Proprietary pH / ORP module design with extra-large junction capacity provides increased service life and can be replaced without opening the meter enclosure.
- Intelligent sensor aging and pollution detection capability provides self-diagnosis during calibration.
- On-board storage lets you record up to 8 Gb of historical data with time stamp and options to set up sample location information.
- Long battery life enables 10,000+ readings.
Item Specification Analysis PTSA/Fluorescein 0~300 ppb,±1 ppb or 1% precision 0~1,000.0 ppb,±0.6 ppb Conductivity 1~15,000 uS/cm with ATC ±1% or ±1 uS/cm precision pH 0~14 with ATC,±0.01 pH unit precision ORP ±1500mV,±1mV precision Temperature 0~70℃(32~160℉) ±0.1℃(±0.18℉) Storage temperature -20℃~60℃(-4~140℉) Operational temperature 0℃~40℃(32~104℉) Sensor module pH/ORP,replaceable Typical sensor life pH/ORP-2 years PTSA/Conductivity-5 years Protection grade IP67, dustproof and waterproof Regulation CE marked Display Color LCD,visible under direct sunlight Power supply 4 AA alkaline batteries Typical battery life 10,000 readings Dimensions (L x W x H) 180 x 80 x 38.5 (mm) Weight ~500g (without batteries) *Note: Specifications are subject to change without notice. Contact Pyxis product support (support@pyxis-lab.com) for updates.
PYXIS HANDHELD DEVICES – SELECT*A*GUIDE Functional Capability SP-350 SP-380 SP-395 SP-400 SP-700B SP-910 PTSA (0-300ppb ● ● ● ● ● Fluoroscein (0-1000ppb) ● ● ● NDSA (0-100ppb) ● ● HST (0-5ppm) ● ● Turbidity ● pH (0-14) ● ORP (+1500mV) ● Conductivity (0-15,000uS) ● ● Temperature (0-70oC) ● WiFi / BlueTooth Enabled ● ● ● ● ● ● Colorimeter Testing ● 
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Handheld Devices
ST-700 Inline pH / ORP / Conductivity Sensor With Embedded Transducers
The Pyxis ST-700 series of pH, ORP, and conductivity probes are designed to simplify installation, calibration, and in-use operation in industrial wastewater and cooling water applications. These probes have an embedded 4~20mA transmitter.
The oversized platinum disk ORP and the flat pH bubble sensing elements increase resistance to contamination. The double salt bridge design with large junction capacity ensures a long sensor life with minimum maintenance.
Typical Applications
Industrial wastewater treatment, cooling water treatment
Features
- Dual embedded transmitters in sensor housing: 4-20mA and RS-485 supporting MODBUS.
- Large conjunction capacity (compared to replaceable electrode design) leading to longer service life.
- Longer maintenance cycles with high contamination resistance. Eliminates the need of pre-amplifier and transfer signal directly in 4~20mA or digital protocol.
- Enhanced robustness when controller is away from sample point.
- Specially designed pH/ORP electrodes tolerant to short time frozen during shipment or storage.
- Stainless steel solution grounding point on sensor to stay away from ground loop problems.
Specifications
Items Specification pH 0~14 range with ATC,±0.01 pH unit precision ORP ±1500mV range,±1mV precision Conductivity 1~15,000 uS/cm Temperature 0~65℃(32~149℉) Response Time 95% within 5 sec Power Supply 12-36V DC,~1W Output 4~20mA isolated,RS-485 isolated Connector Custom IP67 waterproof connector,1.5m(4.5ft) Operation Pressure Up to 0.7 MPa(100 PSI)at 65℃(149℉) Installation Custom 3/4inch tee with NPT thread Storage temperature -20℃~60℃(-4~140℉) Operational temperature 0℃~40℃(32~104℉) Typical service life pH/ORP 2 years,Conductivity 5 years Housing material CPVC Dimension 172mm long,36.6mm diameter(6.8inch long 1.44inch diameter) Weight 170g (0.37lbs) Regulation CE SKU: n/a -
Handheld Devices
Online Algae Detection Technology: EM 500, EM 400, EM 900
Online Algae Detection Technology
Eliminates Color & Turbidity Interference!
EM 500 – Online Chlorophyll-a Detection
EM 400 – Handheld Chlorophyll-a Detection
EM 900 – Handheld Chlorophyll-a + Colorimeter
Measures Living Chlorophyll-a
Ideal For Algae Dynamic Measurement of System
For Alarming or Algaecide Dosing Automation
- Easy deployment
- Interference resistant
- Minimal maintenance
4-20mA & Modbus RS485 Connection
Wireless CalibrationSmart Phone or Pyxis SP Units
Probe fouling diagnostics through PC
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