Pyxis ST-774 User Manual
Dissolved oxygen sensor
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Summary of Contents for Pyxis ST-774
- Page 2 ST-774 Dissolved Oxygen Sensor User Manual February 17, 2021 Rev. 1.00 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-774 Sensor ......18 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
Henry’s Law constant, which is a function of the temperature and the ionic strength (or conduc- tivity) of the water sample. Pyxis uses the latest USGS equations to convert the measured partial pressure and temperature measured by the built-in temperature sensor to a DO value in ppb (or g/L) for the ST-774 sensor. -
Page 6: Specifications
Enclosure Rating IP67/IP68 Regulation CE, RoHS 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 7: Optional Accessories
Pyxis E-Store at https://pyxis- lab.com/shop/ Table 2. Optional Accessories Accessory Name Part Number (P/N) MA-CR Bluetooth Adapter For 8-Pin Pyxis Sensors MA-CR DO-Zero Calibration Kit 42058 ST-774/776 Flow Cell Assembly — Replacement 53718 DCC-2 Dissolved Oxygen Membrane Cap — Replacement 53716 DCC-3 Pure Nitrogen Gas 99.9999% Cylinder —... -
Page 8: Installation
4 Installation 4.1 Piping The ST-774 sensor must always be installed in sample flow at or below the upper temperature limit of the sensor (<122 °F). In many applications a sample pre-cooler will be required to adjust sample temperature to an acceptable level. To properly install the ST-774 sensor, follow the steps below: 1. -
Page 9: Wiring
4.3 Connecting via Bluetooth A Bluetooth adapter (P/N: MA-CR) can be used to connect a ST-774 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 10: 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 4. uPyxis® Mobile App installation ST-774 User Manual service@pyxis-lab.com | +1 (866) 203-8397... -
Page 11: 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-774 and its Serial Number (SN) will be displayed (Figure 5). 4. Press on the ST-774 sensor image. -
Page 12: Calibration Screen And Reading
The gas flow rate should be regulated between 2 and 10 liter per minute. Alternatively, the Pyxis DO-Zero Calibration Kit (P/N: 42058, seen in Figure 1) can be used for the zero and/or slope calibrations. The kit contains an aluminum gas cylinder 99.9999% Nitrogen (P/N: 42059) equipped with flow regulating pressure gauge and an extra sample cell mounted onto a portable stainless steel panel. - Page 13 5.3.3 Air (Slope) Calibration 1. Place the ST-774 sensor in the air with a stable temperature or in air-saturated water. 2. Let the ST-774 sensor stand for a minimum of 6 minutes. Observe the values being displayed on the Calibration screen.
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Page 14: Diagnosis Screen
To preform a Cleanliness and Selflife Check, first select the Diagnosis Condition which defines the fluid type that the ST-774 sensor in currently measuring, then press Cleanliness and Selflife Check. If the sensor... -
Page 15: Device Info Screen
Desktop application. Double click the uPyxis.Setup.exe file to install. Figure 9. uPyxis® Desktop App installation Click Install to start the installation process. Follow the screen instructions to complete the USB driver and uPyxis® installation. ST-774 User Manual service@pyxis-lab.com | +1 (866) 203-8397... -
Page 16: Connecting To Upyxis® Desktop App
3. On uPyxis® Desktop App, click Device Connect via USB-Bluetooth (Figure 10). 4. If the connection is successful, the ST-774 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 17: Information Screen
Span. NOTE Before calibrating, remove the ST-774 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 18 6.4.3 Air (Slope) Calibration 1. Place the ST-774 sensor in the air with a stable temperature or in air-saturated water. 2. Let the ST-774 sensor stand for a minimum of 6 minutes. Observe the values being displayed on the Calibration screen.
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Page 19: 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-774 sensor is currently measuring, then click Cleanliness and Selflife Check. -
Page 20: Adjusting 4-20Ma Span
Figure 15. 7.3 Communication using Modbus RTU The ST-774 sensor is configured as a Modbus slave device. In addition to the dissolved oxygen ppb value, many operational parameters, including warning and error messages, are available via a Modbus RTU con- nection. -
Page 21: Sensor Maintenance And Precaution
ST-774 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 22: Storage
Figure 16. Inline Probe Cleaning Solution Kit To clean the ST-774 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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