Pyxis ST-500W User manual

Table of Contents
1Introduction...................................................................................................................................... 2
2Specifications.................................................................................................................................... 3
3Unpacking Instrument ...................................................................................................................... 3
3.1 Standard Accessories Included with ST-500W........................................................................... 4
3.2 Optional Accessories ................................................................................................................ 4
Optional Accessories Information ....................................................................................................... 4
4Installation & Diagram...................................................................................................................... 5
4.1 ST-500W Installation Instructions & Diagram ........................................................................... 5
4.2 Wiring...................................................................................................................................... 7
4.3 Connecting via Bluetooth to Mobile Device.............................................................................. 7
5Setup and Calibration with uPyxis® Mobile App............................................................................... 8
5.1 Download uPyxis® Mobile App................................................................................................. 8
5.2 Connecting to uPyxis® Mobile App ........................................................................................... 9
5.3 Calibration Screen and Reading................................................................................................ 9
5.4 Diagnosis Screen .................................................................................................................... 10
5.5 Device Info Screen.................................................................................................................. 11
6Setup and Calibration with uPyxis® Desktop App ........................................................................... 11
6.1 Install uPyxis® Desktop App.................................................................................................... 11
6.2 Connecting to uPyxis® Desktop App via Bluetooth.................................................................. 12
6.3 Connecting to uPyxis® Desktop App via USB-C Cable .............................................................. 13
6.4 Information Screen ................................................................................................................ 15
6.5 Calibration Screen.................................................................................................................. 15
6.6 Diagnosis Screen .................................................................................................................... 16
7Outputs........................................................................................................................................... 16
7.1 4–20mA Output Setup............................................................................................................ 16
7.2 Adjusting 4–20mA Span ......................................................................................................... 17
7.3 Communication using Modbus RTU........................................................................................ 18
8Sensor Maintenance and Precaution.............................................................................................. 18
8.1 Methods to Cleaning the ST-500 Series Sensor ....................................................................... 19
8.2 Storage .................................................................................................................................. 19
9Troubleshooting ............................................................................................................................. 20
10 Contact Us................................................................................................................................. 20

ST-500W Inline PTSA Sensor [e-mail] | [phone]
Warranty Information
Confidentiality
The information contained in this manual may be confidential and proprietary and is the property of Pyxis Lab,
Inc. Information disclosed herein shall not be used to manufacture, construct, or otherwise reproduce the goods
described. Information disclosed herein shall not be disclosed to others or made public in any manner without
the express written consent of 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). The warranty set forth is exclusive and no other warranty, whether written or oral, is
expressed or implied.
Warranty Term
The Pyxis warranty term is thirteen (13) months ex-works. In no event shall the standard limited warranty
coverage extend beyond thirteen (13) months from original shipment date.
Warranty Service
Damaged or dysfunctional instruments may be returned to Pyxis for repair or replacement. In some instances,
replacement instruments may be available for short duration loan or lease.
Pyxis warrants that any labor services provided shall conform to the reasonable standards of technical
competency and performance effective at the time of delivery. All service interventions are to be reviewed and
authorized as correct and complete at the completion of the service by a customer representative, or designate.
Pyxis warrants these services for 30 days after the authorization and will correct any qualifying deficiency in labor
provided that the labor service deficiency is exactly related to the originating event. No other remedy, other than
the provision of labor services, may be applicable.
Repair components (parts and materials), but not consumables, provided during a repair, or purchased
individually, are warranted for 90 days ex-works for materials and workmanship. In no event will the
incorporation of a warranted repair component into an instrument extend the whole instrument’s warranty
beyond its original term.
Warranty Shipping
A Repair Authorization (RA) Number must be obtained from Pyxis Technical Support before any product can be
returned to the factory. Pyxis will pay freight charges to ship replacement or repaired products to the customer.
The customer shall pay freight charges for returning products to Pyxis. Any product returned to the factory
without an RA number will be returned to the customer. To receive an RMA, you can generate a request on our
website at https://pyxis-lab.com/request-tech-support/
Pyxis Technical Support
Contact Pyxis Technical Support at [phone], [e-mail], or by filling out a request for
support at https://pyxis-lab.com/request-tech-support/.

ST-500W Inline PTSA Sensor [e-mail] | [phone]
1Introduction
The ST-500W is an inline PTSA Pyxis smart sensor uniquely designed to be directly inserted into the Walchem® (pH &
conductivity) and/or Turner Designs (Little Dipper-2®) inline tee assemblies. The 304SS machined stainless steel body
design allows users to directly insert the sensor into existing inline tee assemblies without the need for plumbing
modifications of equipment already in use.
The ST-500W is identical in internal design and function as the world-class ST-500 Series inline PTSA sensor platform
offering the industry a proprietary design for the direct measurement of PTSA (Pyrenetetrasulfonic Acid, CAS# 59572-
10-0) utilizing LED UV light sources (365nm ex/ 410nm em) and is specifically designed for use in industrial cooling
water and process water treatment applications.
The Pyxis ST-500W sensor is a smart device. In addition to measuring fluorescence, all ST-500 Series sensors have extra
photo-electric components that monitor the color and turbidity of the sample water. This extra feature allows
automatic color and turbidity compensation to eliminate interference commonly associated with real-world waters
The ST-500W offers a combination of 4-20mA as well as RS-485 Modbus output signals in 8-Pin cable format and is
Bluetooth Enabled for wireless cleanliness diagnostics and calibration when used with MA-CR or PowerPACK Series
Bluetooth Adapters and the uPyxis APP for Mobile or Desktop devices. The ST-500W comes equipped with 1.5m (4.9ft)
bulk-head cable with quick adapter as well as 1.5m (4.9ft) flying lead cable with quick adapter, enabling rapid wiring to
any microprocessor controller, PLC or DCS system.
The Pyxis ST-500W sensor has a short fluidic channel and can be easily cleaned. The fluidic and optical arrangement of
the ST-500W is designed to overcome shortcomings associated with other fluorometers that have a distal sensor
surface or a long, narrow fluidic cell. Traditional inline fluorometers are susceptible to color, turbidity interference, and
fouling, making them very difficult to properly clean.
The Pyxis ST-500W sensor uses a narrow wavelength band gallium phosphide photodiode and high temperature-
tolerant and humidity-resistant optical filters. This combination greatly enhances the robustness of the sensor. It can
be operated under a wide range of ambient conditions without the need of humidity and temperature regulation. The
performance of the ST-500W sensor can be stable and consistent for a long period of time.
ST-500W Sensor

ST-500W Inline PTSA Sensor [e-mail] | [phone]
2Specifications
Table 1. ST-500W Specifications
Item
ST-500W
P/N
58802
PTSA Output Range
Factory Set Range 0 – 200ppb
PTSA Maximum Range
Adjusted via uPyxis 0 - 300ppb
PTSA Precision/Accuracy
+/- 1 ppb
Excitation/Emission
LED 365/410nm
Power Supply
22 – 26V DC, Power Consumption – 1W
Outputs
Isolated 4 – 20 mA Analog Outputs & RS-485 Modbus Output -8Pin
Installation
Walchem® Inline Tee
(pH & Conductivity)
Turner Designs Inline Tee
(Little Dipper 2®)
Miscellaneous Items Included
1-Universal Nut / 1-Oring for Walchem Tee / 1-Oring for Turner Tee
Flow Range
0.25 – 8.0 GPM
Weight
500 g (1.1 lbs.)
Operational Pressure
<100 psi (6.9 Bar)
Operating Temperature
4 °C – 49 °C (40 – 120 °F)
Storage Temperature
-20 °C – 60 °C (-4 – 140 °F)
Material
304 Stainless Steel
Rating
IP67, Fully Dustproof & Waterproof
Regulation
CE Marked + RoHS
Dimension (L x W x H)
Length 6.8 inch (172.7 mm), body diameter 1.44 Inch (36.6 mm)
Cable Length
1.5 meter 8-pin Bulkhead w Adapter/ 1.5 meter 8-pin Flying Lead w/ Adapter
NOTE - These specifications are subject to change without notice.
Walchem® is a registered trademark of Iwaki America Inc. – Holliston, MA.
Little Dipper-2® is a registered trademark of Turner Designs Inc. – San Hose, CA.
3Unpacking 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 [e-mail].

ST-500W Inline PTSA Sensor [e-mail] | [phone]
3.1 Standard Accessories Included with ST-500W
Each ST-500W Package (P/N 58802) will include the following standard accessories.
•One ST-500W Inline PTSA Sensor
•One Universal NUT (P/N 23133) for sensor install with Walchem -or- Turner Designs Tee Assemblies
•One O-ring for sensor use with the Walchem Tee (P/N 21501)
•One O-ring for sensor use with the Turner Designs Tee (P/N 26560)
•One Quick-Start Instruction Guide with QR Code to Operation Manual
User Manual also available online at www.pyxis-lab.com
Figure 1. – ST500W Package as Opened
3.2 Optional Accessories
Optional Accessories Information P/N
Universal Nut Replacement (ST-500W Nut for use with Walchem or Turner Designs Tee Assembly) 23133
O-ring Replacement (for ST-500W use with Walchem Tee)21501
O-ring Replacement (for ST-500W use with Turner Designs Little Dipper-2 Tee) 26560
PTSA-100 (PTSA Calibration Standard 100ppb / 500mL) 21001
Pyxis Probe Cleaning Kit (500mL Cleaning Solution with Brushes)SER-01
MA-CR Bluetooth Adapter (Pyxis Bluetooth Adapter for 8Pin Pyxis Sensors) MA-CR
MA-NEB Bluetooth/USB Adapter (Enables Bluetooth for Desktop and uPyxis APP) MA-NEB
PowerPACK-1 (Single Chanel Auxiliary Power Supply w/Bluetooth for Pyxis Sensors) MA-BLE-1
PowerPACK-2 (Dual Chanel Auxiliary Power Supply w/Bluetooth For Pyxis Sensors) MA-BLE-2
PowerPACK-4 (Four Chanel Auxiliary Power Supply w/Bluetooth For Pyxis Sensors) MA-BLE-4
MA-NEB Bluetooth/USB Adapter (Enables Bluetooth for Desktop and uPyxis APP) MA-NEB
MA-10CR (10’ Extension Cable for 8Pin Pyxis Sensors) 50741
MA-50CR (50’ Extension Cable for 8Pin Pyxis Sensors) 50743

ST-500W Inline PTSA Sensor [e-mail] | [phone]
4Installation & Diagram
4.1 ST-500W Installation Instructions & Diagram
The ST-500W has been uniquely designed to be used in both the Walchem Tee Assembly and the Turner Designs
Tee Assembly. This approach was taken to enable users the ability to use advanced Pyxis sensor technology without
the need for plumbing and/or equipment change of existing systems installed in the field.
Each ST-500W will come provided with the sensor.
-One 8-Pin bulkhead cable
-One 8-Pin flying lead cable
-One Universal NUT (CPVC) for use with both Walchem and Turner Tee Assembly
-One O-ring for use with Walchem Tee Assembly
-One O-ring for use with Turner Tee Assembly
The ST-500W can be installed in a vertical or horizontal flow path with the existing Walchem or Turner Tee in place.
When installed in a horizontal flow path, a downstream valve is always suggested to allow users to mitigate any
potential for air bubble interference. The following steps should be taken for installation.
1. Determine if your existing inline Tee assembly is Walchem or
Turner. Typically, the Walchem tee is a light gray CPVC material
while the Turner Designs tee is a dark grey or black CPVC
material.
2. Once your tee is identified, insert the appropriately labeled O-
ring provided with the ST-500W based on the manufacturer of
your tee (i.e., Walchem or Turner). Insert the O-ring into the O-
ring groove of the tee. You will note varying O-ring thickness is
used for each tee design. Using the incorrect O-ring can lead to
a non-water tight seal.
3. Insert the ST-500W sensor into the tee with the stainless-steel
collar alignment screws properly aligned with the tee.
4. Tighten the Pyxis provided Universal Nut onto the tee to form
a water-tight, compression seal.
5. NOTE – This nut is universally designed to be used on both the
Walchem and Turner Designs tee assemblies and should aways
be used with the correct O-ring provided by Pyxis Lab. Some tee
threads may remain visible even if the nut is fully engaged onto
the tee. This is normal and should not be for concern and the
nut will function as specified for pressure and flow of the ST-
500W sensor specifications. Replacement NUT and O-rings are
available from Pyxis Lab Inc.

ST-500W Inline PTSA Sensor [e-mail] | [phone]
Figure 3. Dimension of the ST-500W Sensor
Figure 4. Dimension of the ST-500W Universal NUT Tee Assembly (mm)

ST-500W Inline PTSA Sensor [e-mail] | [phone]
4.2 Wiring
Please refer to the table below for wiring of the ST-500W to a receiving controller or PLC.
*NOTE*: The 24V power ground and the 4-20 mA- return are internally connected. If insufficient wattage is
available from the connected controller (ie. 1.5W), Pyxis recommends the PowerPACK Series Auxiliary Power &
Bluetooth Communication Adapters highlighted in the Optional Accessories section of this manual. If a separate
DC power supply other than that from the controller is used, make sure that the output from the power supply is
rated for 22-26 VDC @ 65mA. Detailed wiring diagrams for common controllers are available from www.pyxis-
lab.com.
Figure 5.
Wire Color
Designation
Red
24V +
Brown
24V Power ground
White
4–20mA + PTSA
Grey
4-20mA -
Pink
Not Used
Green*
Earth Ground
Blue
RS-485 A
Yellow
RS-485 B
Black
Shield, Earth ground
Please refer to the table below for proper ST-500W input 4-20mA scaling in your receiving display, controller, or PLC.
Figure 6.
ST-500W Output Scaling (4-20mA)
mA
Value
Units
4
0
ppb
20
200
ppb
*NOTE* the 20mA value is adjustable to a MAX of 300ppb via
uPyxis. See 4-20mA SPAN Adjustment in this manual for details.
For values >300ppb, Pyxis must do a factory scale adjustment.
4.3 Connecting via Bluetooth to Mobile Device
A Bluetooth adapter (P/N: MA-CR) can be used to connect a ST-500 Series sensor to a smart phone or mobile
device with the uPyxis® Mobile App directly. The power should be sourced from a 24VDC power terminal of a
controller. If a controller is not available, please purchase a Pyxis PowerPACK Series auxiliary power supply with
Bluetooth (see Section 3.2), or an alternative 24VDC power supply that can directly connect to the ST-500 Series
sensor with proper cable connectors from Pyxis.

ST-500W Inline PTSA Sensor [e-mail] | [phone]
Figure 7. 8-Pin Pyxis Sensor with MA-CR and uPyxis Mobile APP
5Setup and Calibration with uPyxis® Mobile App
5.1 Download uPyxis® Mobile App
Download uPyxis® Mobile App from Apple App Store or Google Play.
Figure 8. uPyxis® Mobile APP Installation

ST-500W Inline PTSA Sensor [e-mail] | [phone]
5.2 Connecting to uPyxis® Mobile App
Connect the ST-500 Series sensor to a mobile smart phone according to the following steps:
1. Install the MA-CR Bluetooth Adapter on the 8Pin output cable from the ST-
500W as outlined on page 8 as seen in Figure 7(if powered by a controller).
2. Open the uPyxis® Mobile App.
3. In the uPyxis® Mobile App, swipe down with finger on the main screen to refresh the list of available Pyxis devices.
*NOTE* this may take multiple finger swipes for Bluetooth to connect to the device.
4. If the connection is successful, the Prism ST-500W and its Serial Number (S/N) will be displayed (Figure 9).
5. Press on the ST-500W sensor image.
Figure 9.
5.3 Calibration Screen and Reading
When connected, the uPyxis® Mobile App will default to the Calibration screen. From the Calibration screen, you
can perform calibrations by pressing on Zero Calibration, Slope Calibration, and 4-20mA Span. Follow the screen
instructions for each calibration step.

ST-500W Inline PTSA Sensor [e-mail] | [phone]
Figure 10.
5.4 Diagnosis Screen
From the Diagnosis screen, you can check the diagnosis condition as well as Export & Upload. This feature may
be used for technical support when communicating with [e-mail]
To perform a Cleanliness Check, first select the Diagnosis Condition which defines the fluid type that the ST-500
Series sensor in currently measuring, then press Cleanliness Check. If the sensor is clean, a Clean message will be
shown. If the sensor is severely fouled, a Dirty message will be shown. In this case, follow the procedure in the
Methods to Cleaning the ST-500 Series Sensor section of this manual.
Figure 11.

ST-500W Inline PTSA Sensor [e-mail] | [phone]
5.5 Device Info Screen
From the Device Info screen. You can name the Device or Product as well as reassign Modbus register.
Figure 12.
6Setup and Calibration with uPyxis® Desktop App
6.1 Install uPyxis® Desktop App
Download and install uPyxis Desktop APP on your PC or Laptop from
https://upyxis.pyxis-lab.com.cn/release/pc/uPyxis.Setup-latest.zip
Click Install to start the installation process. Follow the screen instructions to complete the USB driver and uPyxis®
installation.
Figure 13. uPyxis® Desktop App installation

ST-500W Inline PTSA Sensor [e-mail] | [phone]
6.2 Connecting to uPyxis® Desktop App via Bluetooth
A Bluetooth adapter (P/N: MA-CR) can be used to connect a ST-500 Series sensor to a laptop or a desktop
computer with a Bluetooth/USB Adapter (P/N: MA-NEB) and the uPyxis® Desktop App. The power should be
sourced from a 24VDC power terminal of a controller. If a controller is not available, please purchase a Pyxis
PowerPACK Series auxiliary power supply with Bluetooth (see Section 3.2), or an alternative 24VDC power supply
that can directly connect to the ST-500 Series sensor with proper cable connectors from Pyxis.
Figure 14. 8-Pin Sensor with MA-CR and MA-NEB and uPyxis Desktop
Connect the ST-500W sensor to a Windows computer using a Bluetooth/USB adapter (P/N: MA-NEB) installed into
the PC being used and the MA-CR Bluetooth Adapter (P/N: MA-CR) installed on the 8-Pin output cable of the ST-
500W according to the following steps:
1. Install the MA-CR Bluetooth Adapter on the 8Pin output cable from the ST-500W
as outlined on page 11 as seen in Figure 14 (if powered by a controller).
2. Plug the MA-NEB Bluetooth/USB adapter into a USB port of the PC.
3. Launch the uPyxis® Desktop App on the PC.
4. On uPyxis® Desktop App, click Device → Connect via USB-Bluetooth (Figure 15).
5. If the connection is successful, the ST-500W and its Serial Number (S/N) 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.

ST-500W Inline PTSA Sensor [e-mail] | [phone]
Figure 15.
6.3 Connecting to uPyxis® Desktop App via USB-C Cable
For those desiring not to use wireless connection to uPyxis, the MA-CR Bluetooth adapter (P/N: MA-CR) can be used to
connect a ST-500 Series sensor to a laptop or a desktop computer with a USB-C cable and the uPyxis® Desktop App.
The power should be sourced from a 24VDC power terminal of a controller. If a controller is not available, please
purchase a Pyxis PowerPACK Series auxiliary power supply with Bluetooth (see Section 3.2), or an alternative 24VDC
power supply that can directly connect to the ST-500 Series sensor with proper cable connectors from Pyxis.
1) Download and install uPyxis Desktop APP from https://upyxis.pyxis-lab.com.cn/release/pc/uPyxis.Setup-latest.zip
2) Connect a USB Type-C cable to the port at the bottom of the MA-CR and to the USB port of the laptop or computer.
This will provide power the MA-WB from the laptop/computer. Connect the MA-CR to the ST-500W sensor. The
MA-CR Bluetooth adapter will boost the 5V of the regular USB to 24V to power the sensor for use with uPyxis
Desktop App.
Figure 16.

ST-500W Inline PTSA Sensor [e-mail] | [phone]
3) Set the MA-CR to operate in USB Mode by following the steps below.
a. Once the MA-CR screen is powered Press or until you arrive at (USB to RS485) screen.
b. Press the Button.
c. Follow Prompts below to Enable USB feature. Once enabled, you may connect to uPyxis.
4) Open the desktop uPyxis APP.
5) Click Device to launch the connection option menu.
6) Select Connect via USB-RS485 (Figure 17).
7) Select the Comm Port to make a connection. Normally only one Comm port is identified by uPyxis. If more than
one Comm port listed in the selection dropdown, you may try to select each one to see if a connection can be
made. Alternatively, you may use the Windows Device Manager to identify the Comm Port that the Pyxis USB
adapter is using.
Figure 17. - Connect to ST-500W via USB-RS485 option
After the connection is established, the ST-500W probe series number and current PTSA reading are displayed on
the left of the information page (Figure 18). In this page, a nickname can be assigned to the probe. The probe
Modbus address can be changed in this page.

ST-500W Inline PTSA Sensor [e-mail] | [phone]
6.4 Information Screen
Once connected to the device, a picture of the device will appear on the top-left corner of the window and the
uPyxis® 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 18.
6.5 Calibration Screen
To calibrate the device, click on Calibration. On the Calibration screen there are three calibration buttons, Zero
Calibration, Slope Calibration, and 4-20mA Span. The screen also displays the reading of the device. The reading
refresh rate is every 4 seconds. Follow the screen instructions for each calibration step.
Figure 19.

ST-500W Inline PTSA Sensor [e-mail] | [phone]
6.6 Diagnosis Screen
After the device has been calibrated and installation has been completed, to check diagnosis, click on Diagnosis.
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 [e-mail].
To perform a Cleanliness Check, first select the Diagnosis Condition which defines the fluid type that the ST-500
Series sensor in currently measuring, then click Cleanliness Check. If the sensor is clean, a green Clean message
will be shown. If the sensor is severely fouled, a red Dirty message will be shown. In this case, follow the
procedure in the Methods to Cleaning the ST-500 Series Sensor section of this manual.
Figure 20.
7Outputs
7.1 4–20mA Output Setup
The 4–20mA output of the ST-500W sensor is scaled as:
ST-500W Output Scaling (4-20mA)
mA
Value
Units
4
0
ppb
20
200
ppb
*NOTE* the 20mA value is adjustable to a MAX of 300ppb via
uPyxis. See 4-20mA SPAN Adjustment in the next section of this
manual for details. For values >300ppb, Pyxis must do a factory
scale adjustment.

ST-500W Inline PTSA Sensor [e-mail] | [phone]
7.2 Adjusting 4–20mA Span
Users may adjust the output scale using 4–20mA Span to change the PTSA value corresponding to the 20mA output
via uPyxis®. For the uPyxis® Mobile App, press 4-20mA Span found on the Calibration and Reading Screen, shown
in Figure 18. For the uPyxis® Desktop App, click 4-20mA Span found on the Calibration Screen, shown in Figure
19. *NOTE* The ST-500W will allow users to adjust 20mA span to a maximum of 300ppb. For modifications of
span to a higher value, the sensor must be formatted at the Pyxis factory. Contact [e-mail] for details.
Figure 21.
Figure 22.

ST-500W Inline PTSA Sensor [e-mail] | [phone]
7.3 Communication using Modbus RTU
The ST-500 Series sensor is configured as a Modbus slave device. In addition to the ppb PTSA value, many
operational parameters, including warning and error messages, are available via a Modbus RTU connection.
Contact Pyxis Lab Customer Service ([e-mail]) for more information.
8Sensor Maintenance and Precaution
The ST-500 Series sensor is designed to provide reliable and continuous PTSA readings even when installed in
moderately contaminated industrial cooling waters. Although the optics are compensated for the effects of
moderate fouling, heavy fouling will prevent the light from reaching the sensor, resulting in low readings and the
potential for product overfeed if the ST-500 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 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.
The ST-500 Series sensor is designed to be easily removed, inspected, and cleaned if required. It is suggested that
the ST-500 Series sensor be checked for fouling and cleaned/calibrated on a monthly basis. Heavily contaminated
waters may require more frequent cleanings. Cleaner water sources with less contamination may not require
cleaning for several months.
The need to clean the ST-500 Series sensor can be determined by the Cleanliness Check using either the uPyxis®
Mobile App (see the Mobile Diagnosis Screen section) or the uPyxis® Desktop App (see the Desktop Diagnosis
Screen section).
See Instructional Video on proper cleaning & calibration techniques of the ST-500 series PTSA sensor below.
How to Clean & Calibrate a Pyxis Lab® ST-Series Inline Sensor | Pyxis Lab® | 2022 Tutorial - YouTube