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Summary of Contents for Pyxis ST-772 Series
- Page 2 ST-772 Series Dissolved Oxygen Sensor User Manual February 16, 2021 Rev. 1.04 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 Sensor Maintenance and Precaution 8.1 Methods to Cleaning the ST-772 Series Sensor ......22 8.2 Storage . - 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 Series sensor offers an easily replaceable, front loading DO membrane cap that has been inde- pendently 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
1.1 Main Features The ST-772 Series sensor includes the following features: • 0.004–20 ppm measurement range • Built-in temperature and pressure sensor with automatic compensation • Accurate and stable measurement with ultra-low drift • Built-in transmitter without preamplifier or meter head •... -
Page 7: Specifications
32–113 °F (0–45 °C) Temperature Pressure 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 ST-772 Series User Manual service@pyxis-lab.com | +1 (866) 203-8397... - Page 8 32–113 °F (0–45 °C) Temperature Pressure 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 ST-772 Series User Manual service@pyxis-lab.com | +1 (866) 203-8397...
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Page 9: Unpacking Instrument
Remove the instrument and accessories from the shipping container and inspect each item for any damage that may have occurred during shipping. Verify that all accessory items are included. If any item is missing or damaged, please contact Pyxis Lab Customer Service at service@pyxis-lab.com. 3.1 Standard Accessories 3.1.1 ST-772 and ST-772-P Standard Accessories (For Submersed Installations) -
Page 10: Optional Accessories
Table 3. Optional Accessories Accessory Name Part Number (P/N) MA-CR Bluetooth Adapter For 8-Pin Pyxis Sensors MA-CR MA-150-1 Submersion Adapter Ball Float & Mounting Bracket for ST-772 and ST-772-P 53705 Floating Submersed Installation MA-120-B Submersion Pipe & Adapter Mounting Bracket for ST-772 and ST-772-P... -
Page 11: Installation
1” FNPT. The ST-772 and ST-772-P dissolved oxygen sensors need to be installed as shown in Figure 1. For installation, users only need to purchase the MA-150-1 from Pyxis Lab and may obtain water-tight conduit and cable seal adapter from their supplier of choice. For sensor replacement and maintenance, users only need to pull the MA-150-1 and DO sensor from fixing bracket vertically (upward). -
Page 12: Submersed Fixed Installation
772-P dissolved oxygen sensors need to be installed as shown in Figure 2. For installation, users only need to purchase the MA-120-B from Pyxis Lab and may obtain water-tight conduit and cable seal adapter from their supplier of choice. For sensor replacement and maintenance, users only need to pull the MA-120-B and DO sensor from fixing bracket vertically (upwards). -
Page 13: Pipeline Installation
The ST-772T (304SS) and ST-772T-P (CPVC) 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. Pyxis recommends installation in a vertical flow format from bottom up to reduce the impact of water bubbles. -
Page 14: Wiring
4.5 Connecting via Bluetooth A Bluetooth adapter (P/N: MA-CR) can be used to connect a ST-772 Series 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 15: Setup And Calibration With Upyxis® Mobile App
5 Setup and Calibration with uPyxis® Mobile App 5.1 Download uPyxis® Mobile App Download uPyxis® Mobile App from Apple App Store Google Play. Figure 5. uPyxis® Mobile App installation ST-772 Series User Manual service@pyxis-lab.com | +1 (866) 203-8397... -
Page 16: Connecting To Upyxis® Mobile App
1. Open uPyxis® Mobile App. 2. On uPyxis® Mobile App, pull down to refresh the list of available Pyxis devices. 3. If the connection is successful, the ST-772 Series and its Serial Number (SN) will be displayed (Figure 4. Press on the ST-772 Series sensor image. -
Page 17: 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 Series 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 18: Diagnosis Screen
5.3.2 Air (Slope) Calibration 1. Place the ST-772 Series sensor in the air with a stable temperature or in air-saturated water. 2. Let the ST-772 Series sensor stand for a minimum of 6 minutes. Observe the values being displayed on the Calibration screen. -
Page 19: Device Info Screen
Desktop application. Double click the uPyxis.Setup.exe file to install. Figure 10. uPyxis® Desktop App installation Click Install to start the installation process. Follow the screen instructions to complete the USB driver and uPyxis® installation. ST-772 Series User Manual service@pyxis-lab.com | +1 (866) 203-8397... -
Page 20: Connecting To Upyxis® Desktop App
3. On uPyxis® Desktop App, click Device Connect via USB-Bluetooth (Figure 11). 4. If the connection is successful, the ST-772 Series and its Serial Number (SN) will be displayed in the left pane of the uPyxis® window. NOTE After the sensor and Bluetooth is powered up, it may take up to 10 seconds for the adapter to establish the wireless signal for communication. -
Page 21: Information Screen
Span. NOTE Before calibrating, remove the ST-772 Series sensor from the water and wipe it with a damp cloth to remove debris and any biofouling. If there is water on the membrane, dry it with a soft cloth, taking special care not to damage the membrane. - Page 22 6.4.1 Zero Calibration 1. Place the sensor in Nitrogen Gas or 5% Sodium Sulfite solution (anaerobic water). 2. Let the ST-772 Series 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...
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Page 23: Diagnosis Screen
If the sensor is fouled, a Please replace the DO membrane cap message will be shown. In this case, follow the procedure in the Methods to Cleaning the ST-772 Series section of this manual. Figure 14. -
Page 24: Adjusting 4-20Ma Span
Figure 16. 7.3 Communication using Modbus RTU The ST-772 Series sensor is configured as a Modbus slave device. In addition to the dissolved oxygen ppm value, many operational parameters, including warning and error messages, are available via a Modbus RTU connection. -
Page 25: Sensor Maintenance And Precaution
ST-772 Series sensor is used as part of an automated control system. When used to control product dosing, it is suggested that the automation system be config- ured 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 26: Storage
Figure 17. Inline Probe Cleaning Solution Kit To clean the ST-772 Series 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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