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Summary of Contents for Pyxis ST-772
- Page 2 ST-772/T Dissolved Oxygen Sensor User Manual December 17, 2020 Rev. 1.02 Pyxis Lab, Inc. 1729 Majestic Dr. Suite 5 Lafayette, CO 80026 USA www.pyxis-lab.com © 2017 Pyxis Lab, Inc. Pyxis Lab Proprietary and Confidential...
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Page 3: Table Of Contents
8.1 Methods to Cleaning the ST-772/T ....... . . 18... - Page 4 Pyxis Lab, Inc. Standard Limited Warranty Pyxis Lab warrants its products for defects in materials and workmanship. Pyxis Lab will, at its option, repair or replace instrument components that prove to be defective with new or remanufactured components (i.e., equivalent to new).
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Page 5: Introduction
The ST-772/T sensor offers an easily replaceable, front loading DO membrane cap that has been indepen- dently developed by Pyxis Lab, with a typical service life of up to two years. This unique DO membrane cap design incorporates a black microporous PTFE membrane material designed to provide extreme scratch resistance, extended life span and simple replacement. -
Page 6: Main Features
• The sensor can be Slope calibrated with air or air saturated water • Zero-point calibration with 5% Sodium Sulfite solution or Nitrogen gas • Submersible (ST-772) or Inline (ST-772T) installation versions • Suitable for dissolved oxygen monitoring of: – Activated Sludge –... -
Page 7: Specifications
Up to 145 psi (1.0 MPa) Enclosure Rating IP67/IP68 Regulation With Pyxis’s continuous improvement policy, these specifications are subject to change without notice. † Cables excluded 3 Unpacking Instrument Remove the instrument and accessories from the shipping container and inspect each item for any damage that may have occurred during shipping. -
Page 8: Standard Accessories
3.1 Standard Accessories 3.1.1 ST-772 Standard Accessories (For Submersed Installations) The following accessories are included in the ST-772 sensor package for submersed installations: • DCC-1 Dissolved Oxygen Membrane Cap P/N: 53712 • MA-1.5CR Cable (1.5 m/4.9 ft 8-Pin Female Adapter/Flying Lead) P/N: 50746 •... -
Page 9: Installation
The ST-772 sensor may be installed in a submersed fixed application using the MA-120-B Submersion Adapter Mounting Bracket. The ST-772 dissolved oxygen sensor needs to be installed as shown in Figure 2. For in- stallation, users need to keep the MA-120-B assembly in place permanently. For sensor replacement and maintenance, users only need to pull the MA-120-B and ST-772 sensor from fixing bracket vertically (up- wards). -
Page 10: Pipeline Installation
Figure 2. ST-772 in a submersed fixed installation 4.3 Pipeline Installation The ST-772T sensor may be installed in an inline flow application using the Pyxis ST-001 Inline Tee Assembly. The ST-001 offers 3/4” FNPT thread or socket weld adapters with unions for easy installation and sensor maintenance. -
Page 11: Wiring
4.5 Connecting via Bluetooth A Bluetooth adapter (P/N: MA-CR) can be used to connect a ST-772/T sensor to a smart phone with the uPyxis® Mobile App or a computer with a Bluetooth/USB Adapter (P/N: MA-NEB) and the uPyxis® Desktop App. -
Page 12: Setup And Calibration With Upyxis® Mobile App
5.2 Connecting to uPyxis® Mobile App Turn on Bluetooth on your mobile phone (Do not pair the phone Bluetooth to the ST-772/T sensor). Open uPyxis® Mobile App. Once the app is open the app will start to search for the sensor. Once the uPyxis®... -
Page 13: Calibration Screen And Reading
5.3.1 Zero Calibration 1. Place the sensor in Nitrogen Gas or 5% Sodium Sulfite solution (anaerobic water). 2. Let the ST-772/T sensor stand for a minimum of 15 minutes. Observe the values being displayed on the Calibration screen. 3. Once the displayed oxygen and temperature values are stable, press... - Page 14 5.3.2 Air (Slope) Calibration 1. Place the ST-772/T sensor in the air with a stable temperature or in air-saturated water. 2. Let the ST-772/T sensor stand for a minimum of 6 minutes. Observe the values being displayed on the Calibration screen.
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Page 15: Diagnosis Screen
Clean message will be shown. If the sensor is severely fouled, a Please replace the DO membrane message will be shown. In this case, follow the procedure in the Methods to Cleaning the ST-772/T section of this manual. Figure 8. -
Page 16: Device Info Screen
Desktop application. Double click the uPyxis.Setup.exe file to install. Figure 10. Click Install to start the installation process. Follow the screen instructions to complete the USB driver and uPyxis® installation. ST-772/T User Manual service@pyxis-lab.com | +1 (866) 203-8397... -
Page 17: Connecting To Upyxis® Desktop App
Desktop App will default to the Information screen. On the Information screen you can set the information description for Device Name, Product Name, and Modbus Address, then click Apply Settings to save. Figure 12. ST-772/T User Manual service@pyxis-lab.com | +1 (866) 203-8397... -
Page 18: Calibration Screen
6.4.1 Zero Calibration 1. Place the sensor in Nitrogen Gas or 5% Sodium Sulfite solution (anaerobic water). 2. Let the ST-772/T sensor stand for a minimum of 15 minutes. Observe the values being displayed on the Calibration screen. 3. Once the displayed oxygen and temperature values are stable, click... - Page 19 6.4.2 Air (Slope) Calibration 1. Place the ST-772/T sensor in the air with a stable temperature or in air-saturated water. 2. Let the ST-772/T sensor stand for a minimum of 6 minutes. Observe the values being displayed on the Calibration screen.
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Page 20: Diagnosis Screen
– 20 mA = 20 ppm 7.2 Communication using Modbus RTU The ST-772/T sensor is configured as a Modbus slave device. In addition to the ppm dissolved oxygen value, many operational parameters, including warning and error messages, are available via a Modbus RTU con- nection. -
Page 21: Sensor Maintenance And Precaution
ST-772/T sensor is used as part of an automated con- trol system. When used to control product dosing, it is suggested that the automation system be configured to provide backup to limit potential product overfeed, for example by limiting pump size or duration, or by alarming if the pumping rate exceeds a desired maximum limit. -
Page 22: Storage
Figure 16. Inline Probe Cleaning Solution Kit To clean the ST-772/T sensor, remove the sensor and the DO membrane cap from the water in use, wipe it with a damp cloth to remove debris and growing organisms, and use a cotton swab dipped in water to clean up the dirt on the membrane surface.
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