Pyxis ST-774 User Manual
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Pyxis ST-774 User Manual

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ST-774 Porta-Panel
Ultra-Low Dissolved Oxygen
Analyzer User Manual
May 2021

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Summary of Contents for Pyxis ST-774

  • Page 1 ST-774 Porta-Panel Ultra-Low Dissolved Oxygen Analyzer User Manual May 2021...

  • Page 2: Table Of Contents

    Catalog Specifications ............................. - 1 - 1.1. Porta-Panel Description, Specifications + Dimensions ................- 1 - Unpackaging .............................. - 5 - 4-20mA Wiring ............................- 5 - Sample and Calibration Gas Connection ..................... - 6 - 4.1. Sample Water Connection ........................- 6 - 4.2.

  • Page 3: Specifications

    Specifications Please reference the ST-774 manual for the full specifications on the ultra-low dissolved oxygen sensor. 1.1. ST-774 Porta-Panel Overview + Specification (P/N 42096) Product Description The ST-774 Porta-Panel (P/N-42096) is a prefabricated panel ideally suited for those desiring to use the ST-774 Ultra-Low DO sensor with local display and data acquisition in a portable fashion for oxygen measurement (ie.
  • Page 4 ST-774 Porta-Panel Diagram (mm) Figure 1 - ST-774 Porta-Panel (P/N-42096) - 2 -...
  • Page 5 ST-774 Description The Pyxis ST-774 is an ultra-low range dissolved oxygen (DO) sensor with a lower limit of detection 0.1 ppb (g/L). It is design is based on the principle of fluorescence quenching to determine the partial pressure of the dissolved oxygen in water and incorporates Pyxis' advanced technology in the field of fluorescence detection.
  • Page 6 USB download. The UC-50 provides RS-485 and 1x 4-20 mA outputs as well as one Relay output for connection to additional controllers, PLC or DCS systems. The UC-50 is premounted as part of the ST-774 Porta-Panel Dissolved Oxygen Analyzer. Figure 3...

  • Page 7: Unpackaging

    (UC-50 Micro Display + Data Logging Terminal) MA-50CR 50743 (50-foot Extension Cable w 8Pin Quick Adapters) *As Pyxis technology is continuously updated, this technical parameter may change at any time without notice; Unpackaging The package includes the following items mounted on the panel •...

  • Page 8: Sample And Calibration Gas Connection

    Slowly open the inlet valve allowing cooled sample to enter the inline rotameter. Adjust inlet sample flow to a range of 50-500mL/minute on the rotameter. Allow your ST-774 sensor to stabilize by observing the display value on the UC-50 display/data logging terminal.

  • Page 9: Operation

    Ultrapure nitrogen gas (Pyxis DCC-3 P/N 42059) is recommend for the zero calibration. The slope calibration requires 0.02% to 0.1% (or 200 to 1000 ppm) oxygen in nitrogen gas (Pyxis DCC-4 P/N 42060). The user can connect the gas source to the gas inlet port. Portable standard calibration gas cylinders can be purchased from Pyxis if desired.

  • Page 10: Button Functions

    5.2. Button Functions The house button on the left is for returing to the main screen from any screens. The left arrow button (second from the left) is for returing to the previous screens. The up and down buttons are for selecting items on the screen by moving the selection focus up, down, left, or right.

  • Page 11: Calibration

    Select Probe Calibration from the screen shown in figure 6. Select Zero cal. Establish the zero calibration gas (Pyxis DCC-3 Cylinder = 99.9999% Nitrogen Gas) flow for 15 minutes or until the ppb reading to be stablized. Press OK on the Zero cal to start the zero calibration. If the zero calibration is complete, a calibration succeed message will be prompted.

  • Page 12: Ma Output Setting

    Figure 11. Calibration succeed Figure 10. High (slope) Calibration 5.5. 4-20 mA Output Setting Select Probe Settings from the Settings screen. Change the 4-20 mA scale via interface shown in figure 13. The unit for DO is ppb (g/L). Figure 12. Probe Setting Figure 13.

  • Page 13: Usb Operation

    Figure 15. Historical Trend Chart Figure 14. Recorded Historical Data The ppb range of the trend chart can be configured via interface shown in figures 16 and 17. Figure 16. Trend Chart Setup Figure 17. Y-Axis Range Setup 5.7. USB Operation UC-50 has a built-in USB interface to support historical data export and firmware upgrade function.
  • Page 14 5.7.1. Export Historical Data Select USB Settings from the Settings screen. In the USB settings screen, historical data can be downloaded to a USB thumb driver by selecting Data Export function. Make sure a USB thumb drive is plugged into UC- 50 before exporting historical data.
  • Page 15 5.7.2. Upgrade UC-50 Firmware Copy the target UC-50 firmware file (.bin) to the root directory of USB thumb drive, plug the thumb drive to UC-50 USB interface, select USB Settings in Settings page and select Progam Upgrade function in USB Settings page.
  • Page 16 Figure 23. Adjusting Set Data Storage (Data Log Frequency in Seconds) Contact us Contact us if you have questions about the use or maintenance of the ST-774 sensor: Pyxis Lab, Inc. 1729 Majestic Dr. Suite 5 Lafayette, CO 80026 USA 1-866-203-8397 www.pyxis-lab.com...

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