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The Pyxis LabĀ® ST-773 optical luminescent dissolved oxygen sensor is based on the principle of āfluorescence quenchingā to determine the dissolved oxygen content in water. It incorporates our advanced technology in the field of fluorescence detection. Uses dual Blue/Red light detection technology with excitation and reference light sources, offering a wide detection range and very low detection limit.
The sensor also integrates a temperature sensor for compensation of the measurement of dissolved oxygen based on environmental conditions. The ST-773 offers an easily replaceable, front loading DO membrane cap that has been independently developed by Pyxis LabĀ®, with a typical service life of up to 2 years. So, this unique membrane cap design incorporates a black microporous PTFE membrane material designed to provide extreme scratch resistance, extended life span and simple replacement.
Furthermore, the flat front-end design of the ST-773 may be utilized in a submersed fixed/floating application or inline with the Pyxis submersion assembly and inline thread/tee accessory options. The ST-773 comes with a 10m bulkhead cable, as well as a 1.5m flying lead cable each with 7-Pin quick adapters. The sensor output offers both 4-20mA and RS-485 Modbus communication which is BluetoothĀ® enabled when used with the MA-WB adapter.
Features
Typical Applications
Specifications
| Item | ST-773 |
| Part Number | 53709 |
| Body Material | CPVC |
| Installation | Submerged/Inline Installation |
| DO Measuring Range | 0.004mg/L or 0-200% Saturation |
| Accuracy | Ā±0.3mg/L or Ā±3%, Whichever is greater |
| Light Source | Blue Light Irradiated Emission / Red Light Quenching Excitation |
| Response Time | <60 seconds |
| Operational Temperature | 0-45 Ā°C (32-113 Ā°F) |
| Operational Voltage | 22-26V DC, Power 0.6W |
| Signal Output | 4-20mA Analog Output / RS-485 Digital Output |
| Dimension (L x D) | 206Ć24.6mm (8.11Ć0.97in) |
| Threading (Meter Tail) | 3/4inch NPT |
| Weight | 188g (0.42lb) Cable Excluded |
| Working Pressure | 75psi |
| Wet Material | CPVC/Polycarbonate |
| Cables Provided | (1) 4.9ft/1.5m Flying Lead (1) 30ft/15m Bulkhead Cable |
| Calibration | Slope Calibration: Air or Air Saturated Water Zero Calibration: 5% Sodium Sulfite or Nitrogen Gas |
| DO Membrane Cap Life | 1.5 Years |
| Protection Grade | IP-67 |
| Regulation | CE / RoHS |
| Compliance | USEPA 40CFR Part 136.3 ISO 17289:2014 |
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