Pyxis ST-540 Series User Manual
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Pyxis ST-540 Series User Manual

Inline ndsa sensors
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Summary of Contents for Pyxis ST-540 Series

  • Page 2 ST-540 Series Inline NDSA Sensor Operation Manual Pyxis Lab, Inc 1729 Majestic Dr. Suite 5 Lafayette, CO 80026 USA www.pyxis-lab.com V3.04 © 2020 Pyxis Lab, Inc. Pyxis Lab Proprietary and Confidential...
  • Page 3 Device Warranty Term The Pyxis warranty term for the ST-540 sensor is thirteen (13) months from original shipment from Pyxis. In no event shall the standard limited warranty coverage extend beyond thirteen (13) months from original shipment date.

  • Page 4: Table Of Contents

    Table of Contents Introduction ..........................4 Features of the Pyxis ST-540 Series ....................4 Specifications ..........................5 Un-packing Instrument ......................... 5 Standard Accessories ........................6 Optional Accessories ........................6 Installation ..........................7 Quick 4-20mA Start ........................9 Calibration and Diagnosis......................9 Calibration and Diagnosis with uPyxis Mobile App ............... 9 4.1.1...

  • Page 5: Introduction

    NDSA (Napthenic Disulfonic Acid CAS# 1655-29-4) utilizing LED light sources for use in boiler water and boiler feedwater measurement applications. The ST-540 Series offers Pyxis proprietary algorithms to determine the concentrations of NDSA in a range of 0-500ppb while simultaneously measuring light loss through the optical channel to determine sensor cleanliness.

  • Page 6: Features Of The Pyxis St-540 Series

    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. Pyxis ST-540 Series...

  • Page 7: Standard Accessories

    (Pyxis Bluetooth Adapter for 7Pin Pyxis Sensors) MA-NEB Bluetooth/USB Adapter MA-NEB (Enables Bluetooth for Desktop and uPyxis APP) PowerPACK-1 MA-BLE-1 (Single Chanel Auxiliary Power Supply w/Bluetooth For Pyxis Sensors) PowerPACK-4 MA-BLE-4 (Four Chanel Auxiliary Power Supply w/Bluetooth For Pyxis Sensors) SP-395N Handheld NDSA Analyzer 50226...

  • Page 8: Installation

    Sample water entering the sensor must be cooled down to below 120 °F (49 °C). The sensor can be held by a 1.75-inch pipe clamp or mounted to a panel with four screws. See Figure 1 for ST-540SS series dimensions. Figure 1. Dimension of the ST-540SS / ST-540SS-N Pyxis ST-540 Series Operation Manual...
  • Page 9 ¾-inch NPT PVC piping bypass network with isolation valves. It is recommended that this sensor be installed with flow in a vertical format entering the bottom of the tee and existing the top. See Figure 1A for ST-540A dimensions. Figure 2A. Dimension of the ST-540A Pyxis ST-540 Series Operation Manual...

  • Page 10: Quick 4-20Ma Start

    4 Calibration and Diagnosis The ST-540 series sensor can be calibrated in a two-point (zero + slope) procedure using a deionized water sample and a standard containing 100 ppb NDSA. The sensor can also be calibrated by a single point method.

  • Page 11: Calibration

    Pyxis Bluetooth devices. The discovered devices will be listed (Figure 3). Tap the discovered ST-540 series sensor to connect to the sensor. The uPyxis app can identify the sensor type if multiple Pyxis sensors are discovered in the scan. For legacy old generation sensors, a dialog message window will be displayed to ask the user to tell the app the sensor type.

  • Page 12: 4-20Ma Span Settings

    Figure 4. A ST-540 series discovered by Figure 5. Calibration page Bluetooth scan 4.1.2 4-20mA Span Settings The default 4-20mA span is 20 mA = 500 ppb NDSA and 4 mA = 0 ppb NDSA. Users may alter the output scale using 4-20mA Span to change the NDSA value corresponding to the 20mA output (Figure 6).

  • Page 13: Diagnosis

    Figure 7. Enter NDSA concentration to set 20mA 4.1.3 Diagnosis Tap Diagnosis in the bottom of the app page to launch the diagnosis page (Figures 7 and 8). Figure 7. Select diagnosis condition Figure 8. Cleanliness check result and raw data Pyxis ST-540 Series Operation Manual...

  • Page 14: Calibration And Diagnosis With Upyxis Desktop App

    MA-WB Bluetooth adapter between the ST-540 series sensor and the connected controller/display. Refer to the diagram below Figure 8. Connect the ST-540 series to a computer via MA-NEB and MA-WB Bluetooth adapters Establish connection between uPyxis app and the ST-540 series sensor through the following steps: 1.
  • Page 15 (Figure 12). In this page, a nickname can be assigned to the sensor. The sensor Modbus address can be changed from its default 10. Figure 9. Connection Options Figure 10. Select a Comm port Pyxis ST-540 Series Operation Manual...
  • Page 16 Figure 11. Connected to a ST-540 sensor and information page Figure 12. Calibration page Pyxis ST-540 Series Operation Manual...

  • Page 17: Calibration

    If the sensor is severely fouled, a red Dirty message will be shown. In this case, please clean the sensor according to the procedure in Section 6 of this manual. If the sensor is partially fouled, a yellow Becoming Dirty message tab will be shown. Figure 13. Enter NDSA concentration for slope calibration Pyxis ST-540 Series Operation Manual...
  • Page 18 Figure 14. Set 4-20mA span Figure 15. Select diagnosis condition before cleanliness check Pyxis ST-540 Series Operation Manual...

  • Page 19: Calibration Through The Controller

    4-20mA calibration. With the default sensor settings, the controller should be set up to convert 4 mA to 0 ppb and 20 mA to 500 ppb. It is likewise essential that the ST-540 series sensor be properly and thoroughly cleaned prior to calibrating via the controller. Calibration of a fouled sensor via the controller may result in scaling issues that can make future calibrations more challenging.

  • Page 20: Sensor Cleaning And Maintenance

    ST-540 series 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 21: Other Common Troubleshooting Issues

    6.2 Other Common Troubleshooting Issues If the ST-540 series sensor output signal is not stable and fluctuates significantly, make an additional solution ground connection - connect the clear solution ground wire to a conductor that contacts the sample water electrically such as a brass pipe adjacent to the ST-540 series sensor.

This manual is also suitable for:

St-540ssSt-540ss-nSt-540a

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