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Summary of Contents for Pyxis ST-773
- Page 2 ST-773 Dissolved Oxygen Sensor User Manual August 11, 2021 Rev. 1.0 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-773 Sensor ......23... - 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-773 series uses the latest USGS equation to convert the oxygen partial pressure to DO in units of ppm or mg/L. Through setup using the uPyxis® Mobile of Desktop App, the ST-773 series sensor can output the measured oxygen partial pressure in other units such as percentage of oxygen saturation. -
Page 6: Main Features
1.1 Main Features The ST-773 sensor includes the following features: • 0.004–20.0 mg/L measurement range • Built-in temperature sensor with automatic compensation • Accurate and stable measurement with ultra-low drift • Built-in transmitter without preamplifier or meter head • Dual Outputs both 4-20mA isolated signal or RS-485 Modbus (7-Pin Format) •... -
Page 7: Specifications
DO Membrane Cap 1.5 years Life Protection Grade IP-67 Regulation CE / RoHS Compliance USEPA 40CFR Part 136.3 / ISO 17289:2014 With Pyxis’s continuous improvement policy, these specifications are subject to change without notice. ST-773 User Manual service@pyxis-lab.com | +1 (866) 203-8397... -
Page 8: Unpacking Instrument
• One MA-NEB Bluetooth/USB Adapter for use with Desktop uPyxis APP • User Manual available online at https://pyxis-lab.com/support/ Figure 1. ST-773 / MA-1100 Flying Lead / MA-WB Bluetooth Adapter / MA-NEB USB Adapter / DCC-6 Membrane Cap] ST-773 User Manual service@pyxis-lab.com | +1 (866) 203-8397... -
Page 9: Optional Accessories
3.2 Optional Accessories The following optional accessories can be ordered from Pyxis Customer Service (order@pyxis-lab.com) or Pyxis E-Store at https://pyxis-lab.com/shop/. Table 2. Optional Accessories Optional / Replacement Accessories Part Number (P/N) MA-WB Bluetooth Adapter for 7-Pin Pyxis Sensors MA-WB MA-150-1 Floating Submersion Adapter Kit... -
Page 10: Installation
1-inch FNPT. (Please note the ST773 outer diameter is 3/4 - inch NPT. A 3/4 to 1-inch NPT bushing is required for installation) The ST-773 dissolved oxygen sensor needs to be installed as shown in Figure 2. 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. -
Page 11: Ma-120-B Submersed Fixed Installation
Mounting Bracket and probe adapter coupler in 1-inch FNPT. (Please note the ST773 outer diameter is 3/4 - inch NPT. A 3/4 to 1-inch NPT bushing is required for installation) The ST-773 dissolved oxygen sensor needs to be installed as shown in Figure 3. 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. -
Page 12: Pipeline Installation
4.3 Pipeline Installation The ST-773 may be installed in a pressurized inline flow application as high as 75 psi (5Bar) using optional accessories (Pyxis ST-001/Collar Kit or ST-771 1-inch Threaded Adapter Kit). Pyxis recommends installation in a vertical flow format from bottom up to reduce the impact of air bubbles. Install the probe collar on the sensor and then install the sensor into the ST-001 tee assembly and ensure the DCC-6 membrane cap is in the direction of water flow as shown in Figure 4. -
Page 13: Wiring
4.5 Connecting via Bluetooth A Bluetooth adapter (P/N: MA-WB) can be used to connect a ST-773 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 14: 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 6. uPyxis® Mobile App installation ST-773 User Manual service@pyxis-lab.com | +1 (866) 203-8397... -
Page 15: 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-773 and its Serial Number (SN) will be displayed (Figure 7). 4. Press on the ST-773 sensor image. -
Page 16: 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-773 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 17 5.3.2 Air (Slope) Calibration 1. Place the ST-773 sensor in the air with a stable temperature or in air-saturated water. 2. Let the ST-773 sensor stand for a minimum of 6 minutes. Observe the values being displayed on the Calibration screen.
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Page 18: Diagnosis Screen
To preform a Cleanliness and Selflife Check, first select the Diagnosis Condition which defines the fluid type that the ST-773 sensor in currently measuring, then press Cleanliness and Selflife Check. If the sensor... -
Page 19: Setup And Calibration With Upyxis® Desktop App
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-773 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-773 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
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-773 User Manual service@pyxis-lab.com | +1 (866) 203-8397... -
Page 22: 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-773 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 23 6.4.2 Air (Slope) Calibration 1. Place the ST-773 sensor in the air with a stable temperature or in air-saturated water. 2. Let the ST-773 sensor stand for a minimum of 6 minutes. Observe the values being displayed on the Calibration screen.
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Page 24: Diagnosis Screen
When in the Diagnosis screen you can view the Diagnosis Condition of the device. This feature may be used for technical support when communicating with service@pyxis-lab.com. To preform a Cleanliness and Selflife Check, first select the Diagnosis Condition which defines the fluid type that the ST-773 sensor is currently measuring, then click Cleanliness and Selflife Check. -
Page 25: Adjusting 4-20Ma Span
Figure 16. 7.3 Communication using Modbus RTU The ST-773 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 con- nection. -
Page 26: Sensor Maintenance And Precaution
ST-773 sensor is used as part of an automated control 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 27: Troubleshooting
Figure 17. Inline Probe Cleaning Solution Kit To clean the ST-773 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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