Pyxis ST-588 User manual

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ST-588 PTSA/Fluorescent Polymer Dual
Inline Sensor
User Manual
June 16, 2021
Rev. 2.04
Pyxis Lab, Inc.
1729 Majesc Dr. Suite 5
Lafayee, CO 80026 USA
www.pyxis-lab.com
© 2017 Pyxis Lab, Inc.
Pyxis Lab Proprietary and Condenal

Table of Contents
1 Introducon 2
1.1 Main Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Specicaons 3
3 Unpacking Instrument 4
3.1 Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2 Oponal Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Installaon 6
4.1 ST-588 Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2 ST-588SS Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.3 Wiring ................................................. 7
4.4 Connecng via Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Setup and Calibraon with uPyxis® Mobile App 8
5.1 Download uPyxis® Mobile App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 Connecng to uPyxis® Mobile App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.3 Calibraon Screen and Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4 Diagnosis Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.5 Device Info Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6 Setup and Calibraon with uPyxis® Desktop App 12
6.1 Install uPyxis® Desktop App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.2 Connecng to uPyxis® Desktop App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.3 Informaon Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.4 Calibraon Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.5 Diagnosis Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7 Outputs 16
7.1 4–20mA Output Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.2 Adjusng 4–20mA Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.3 Communicaon using Modbus RTU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8 Sensor Maintenance and Precauon 18
8.1 Methods to Cleaning the ST-588 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.2 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9 Troubleshoong 19
10 Contact Us 19

Warranty Informaon
Condenality
The informaon contained in this manual may be condenal and proprietary and is the property of Pyxis
Lab, Inc. Informaon disclosed herein shall not be used to manufacture, construct, or otherwise reproduce
the goods described. Informaon disclosed herein shall not be disclosed to others or made public in any
manner without the express wrien consent of Pyxis Lab, Inc.
Standard Limited Warranty
Pyxis Lab warrants its products for defects in materials and workmanship. Pyxis Lab will, at its opon, repair
or replace instrument components that prove to be defecve with new or remanufactured components
(i.e., equivalent to new). The warranty set forth is exclusive and no other warranty, whether wrien 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 dysfunconal instruments may be returned to Pyxis for repair or replacement. In some in-
stances, replacement instruments may be available for short duraon loan or lease.
Pyxis warrants that any labor services provided shall conform to the reasonable standards of technical com-
petency and performance eecve at the me of delivery. All service intervenons are to be reviewed and
authorized as correct and complete at the compleon of the service by a customer representave, or des-
ignate. Pyxis warrants these services for 30 days aer the authorizaon and will correct any qualifying
deciency in labor provided that the labor service deciency is exactly related to the originang 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 in-
corporaon of a warranted repair component into an instrument extend the whole instrument’s warranty
beyond its original term.
Warranty Shipping
A Repair Authorizaon (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 hps://pyxis-lab.com/request-tech-support/.
Pyxis Technical Support
Contact Pyxis Technical Support at [phone], [email protected], or by lling out a request for
support at hps://pyxis-lab.com/request-tech-support/.
ST-588 User Manual [email protected] | [phone]

1 Introducon
The Pyxis ST-588 inline uorometer sensor simultaneously measures the concentraon of PTSA and Fluo-
rescent Polymer in water. It can be simply inserted to the compression ng port of a custom-made tee.
The standard ST-001 installaon tee provided with each ST-588 sensor, has two ¾ inch female NPT ports and
can be placed to an exisng ¾ inch sample water line. Pyxis Lab also oers 2” and 3” Tee formats for larger
ow installaons. The 4–20mA current output of the ST-588 sensor can be connected to any controller
that accepts an isolated or non-isolated 4–20mA input. The ST-588 sensor is a smart device. In addion
to measuring PTSA and Fluorescent Polymer, the ST-588 sensor has extra photo-electric components that
monitor the color and turbidity of the sample water. This extra feature allows automac color and turbidity
compensaon to eliminate interference commonly associated with real-world waters.
The Pyxis ST-588 sensor has a short uidic channel and can be easily cleaned. The uidic and opcal ar-
rangement of the ST-588 sensor is designed to overcome shortcomings associated with other uorometers
that have a distal sensor surface or a long, narrow uidic cell. Tradional inline uorometers are suscepble
to color and turbidity interference and fouling and are dicult to properly clean.
1.1 Main Features
The ST-588 measures PTSA and Fluorescent Polymer in a water sample and includes the following features:
• Easy calibraon with using uPyxis® Mobile or Desktop App.
• Automac compensaon for turbidity up to 150 NTU and color created by up to 10 ppm iron or
equivalent to 10 ppm humic acid.
• Diagnosc informaon (sensor fouling, color or turbidity over range, failure modes) are available in
uPyxis® App or via Modbus RTU.
• Easy to remove from the system for cleaning and calibraon without the need for any tools.
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2 Specicaons
Table 1. ST-588 Specicaons
Specicaon*ST-588 ST-588SS
Part Number (P/N) 50692 50693
Fluorescent Polymer
Range †0.0–20.0 ppm
Fluorescent Polymer
Accuracy ±0.1 ppm
PTSA Range 0.0–200.0 ppb
PTSA Accuracy ±1 ppb
Excitaon Wavelength 410 nm (Fluorescent Polymer)
365 nm (PTSA)
Emission Wavelength 450 nm (Fluorescent Polymer)
410 nm (PTSA)
Wavelength Accuracy ±1 nm
Calibraon Two-point calibraon against standard soluon
Outputs 2x 4–20mA Analog Output,
RS-485 Digital Output with Modbus protocol
Installaon
Custom tee assembly (P/N: ST-001)
with 3/4” FNPT socket & threaded
ports
3/4” FNPT threaded ports
Cable Length 5  with IP67 connectors & 1.5  ying lead with IP67 adapter
Power Supply 22–26 VDC, 1.8 W
Dimension (L ×Dia) ‡6.8 ×1.44 inch (172.7 ×36.6 mm)
Weight 0.37 lbs (170 g) 2.5 lbs (1148 g)
Material UPVC 304 Stainless Steel
Operaonal
Temperature 40–104 °F (4–40 °C)
Storage Temperature 20–140 °F (-7–60 °C)
Pressure Up to 100 psi (0.7 MPa) Up to 290 psi (2.0 MPa)
Enclosure Rang IP67
Regulaon CE
*With Pyxis’s connuous improvement policy, these specicaons are subject to change without noce.
†The uorescent polymer concentraon scale is based on the polymer containing 0.25 mole % uorescent
monomer. Typical polymer specicaons are aached below but may vary by producer.
‡See Figure 3 for ST-588SS dimensions.
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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. Verify that all accessory items are included. If any item is missing
or damaged, please contact Pyxis Lab Customer Service at [email protected].
3.1 Standard Accessories
• Tee Assembly 3/4” NPT (1x Tee, O-ring, and Nut) P/N: ST-001
*NOTE*ST-001 is not included for ST-588SS
• MA-1.5CR Cable (1.5 m/4.9  8-Pin Male Adapter/Flying Lead) P/N: 50746
• User Manual available online at hps://pyxis-lab.com/support/
ST-588 User Manual [email protected] | [phone]

3.2 Oponal Accessories
The following oponal accessories can be ordered from Pyxis Customer Service ([email protected]) or
Pyxis E-Store at hps://pyxis-lab.com/shop/.
Figure 1.
ST-588 User Manual [email protected] | [phone]

4 Installaon
4.1 ST-588 Piping
The provided ST-001 Tee Assembly can be connected to a pipe system through the 3/4” female ports, either
socket or NPT threaded. To properly install the ST-588 sensor into the ST-001 Tee Assembly, follow the steps
below:
1. Insert the provided O-ring into the O-ring groove on the tee.
2. Insert the ST-588 sensor into the tee.
3. Tighten the tee nut onto the tee to form a water-ght, compression seal.
Figure 2. Dimension of the ST-588 and the ST-001 Tee Assembly (mm)
4.2 ST-588SS Piping
The ST-588SS sensor has 3/4” female NPT threaded ports on the sensor itself and therefore does not require
a custom tee assembly. It is recommended that two 3/4” NPT to 1/4” tubing adapters are used to connect
the sensor to the sampling system. Sample water entering the sensor must be cooled down to below 104
°F (40 °C). The sensor can be held by a 1.75-inch pipe clamp or mounted to a panel with four 1/4-28 bolts.
See Figure 4 for ST-588SS dimensions.
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Figure 3. Dimension of the ST-588SS (inch)
4.3 Wiring
If the power ground terminal and the negave 4–20mA terminal in the controller are internally connected
(non-isolated 4–20mA input), it is unnecessary to connect the 4–20mA negave wire (gray) to the 4–20mA
negave terminal in the controller. 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 @ 85 mA.
*NOTE*The negave 24V power terminal (power ground) and the negave 4–20mA ter-
minal on the ST-588 sensor are internally connected.
Follow the wiring table below to connect the ST-588 sensor to a controller:
Table 2.
Wire Color Designaon
Red 24V +
Brown 24V Power ground
White Fluorescent Polymer, 4–20mA +
Pink PTSA, 4–20mA +
Gray*4–20mA -
Blue RS-485 A
Yellow RS-485 B
Green RS-485 C, earth ground
*Internally connected to the power ground
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4.4 Connecng via Bluetooth
A Bluetooth adapter (P/N: MA-CR) can be used to connect a ST-588 sensor to a smart phone with the uPyxis®
Mobile App or a computer with the uPyxis® Desktop App.
Figure 4. Bluetooth connecon to ST-588 sensor
5 Setup and Calibraon with uPyxis® Mobile App
5.1 Download uPyxis® Mobile App
Download uPyxis® Mobile App from Apple App Store or Google Play.
Figure 5. uPyxis® Mobile App installaon
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5.2 Connecng to uPyxis® Mobile App
Connect the ST-588 sensor to a mobile smart phone according to the following steps:
1. Open uPyxis® Mobile App.
2. On uPyxis® Mobile App, pull down to refresh the list of available Pyxis devices.
3. If the connecon is successful, the ST-588 and its Serial Number (SN) will be displayed (Figure 6).
4. Press on the ST-588 sensor image.
Figure 6.
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5.3 Calibraon Screen and Reading
When connected, the uPyxis® Mobile App will default to the Calibraon screen. From the Calibraon
screen, you can perform calibraons by pressing on Zero Calibraon,Slope Calibraon, and 4–20mA Span
for either Fluorescent Polymer or PTSA, independently. Follow the screen instrucons for each calibraon
step.
Figure 7.
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5.4 Diagnosis Screen
From the Diagnosis screen, you can check the diagnosis condion. This feature may be used for technical
support when communicang with [email protected].
To preform a Cleanliness Check, rst select the Diagnosis Condion which denes the uid type that the
ST-588 sensor in currently measuring, then press Cleanliness Check. If the sensor is clean, a Clean mes-
sage 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-588 secon of this manual.
Figure 8.
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5.5 Device Info Screen
From the Device Info screen. You can name the Device or Product as well as set the Modbus address.
Figure 9.
6 Setup and Calibraon with uPyxis® Desktop App
6.1 Install uPyxis® Desktop App
Download the latest version of uPyxis® Desktop soware package from: hps://pyxis-lab.com/upyxis/ this
setup package will download and install the Microso.Net Framework 4.5 (if not previously installed on the
PC), the USB driver for the USB-Bluetooth adapter (MA-NEB), the USB-RS485 adapter (MA-485), and the
main uPyxis® Desktop applicaon. Double click the uPyxis.Setup.exe le to install.
Figure 10. uPyxis® Desktop App installaon
Click Install to start the installaon process. Follow the screen instrucons to complete the USB driver and
uPyxis® installaon.
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6.2 Connecng to uPyxis® Desktop App
Connect the ST-588 sensor to a Windows computer using a Bluetooth/USB adapter (P/N: MA-NEB) according
to the following steps:
1. Plug the Bluetooth/USB adapter into a USB port in the computer.
2. Launch uPyxis® Desktop App.
3. On uPyxis® Desktop App, click Device →Connect via USB-Bluetooth (Figure 11).
4. If the connecon is successful, the ST-588 and its Serial Number (SN) will be displayed in the le pane
of the uPyxis® window.
*NOTE*Aer the sensor and Bluetooth is powered up, it may take up to 10 seconds for the
adapter to establish the wireless signal for communicaon.
Figure 11.
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6.3 Informaon Screen
Once connected to the device, a picture of the device will appear on the top le corner of the window and
the uPyxis® Desktop App will default to the Informaon screen. On the Informaon screen you can set the
informaon descripon for Device Name,Product Name, and Modbus Address, then click Apply Sengs
to save.
Figure 12.
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6.4 Calibraon Screen
To calibrate the device, click on Calibraon. On the Calibraon screen there are six calibraon opons:
• Fluorescent Polymer: Zero Calibraon,Slope Calibraon, and 4-20mA Span
• PTSA: Zero Calibraon,Slope Calibraon, and 4-20mA Span
The screen also displays the reading of the device. The reading refresh rate is every 4 seconds.
Figure 13.
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6.5 Diagnosis Screen
Aer the device has been calibrated and installaon has been completed, to check diagnosis, click on Di-
agnosis. When in the Diagnosis screen you can view the Diagnosis Condion of the device. This feature
may be used for technical support when communicang with ser[email protected]. To preform a sensor
Cleanliness Check, rst select the Diagnosis Condion which denes the uid type that the ST-588 sensor is
currently measuring, then click Cleanliness Check. If the sensor is clean, a Clean message will be shown.
If the sensor is fouled, a Please Clean message will be shown. In this case, follow the procedure in the
Methods to Cleaning the ST-588 secon of this manual.
Figure 14.
7 Outputs
7.1 4–20mA Output Setup
The 4–20mA output of the ST-588 sensor is scaled as:
• Fluorescent Polymer:
–4 mA = 0 ppm
–20 mA = 20 ppm
• PTSA:
–4 mA = 0 ppb
–20 mA = 200 ppb
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7.2 Adjusng 4–20mA Span
Users may adjust the output scale using 4–20mA Span to change either the Fluorescent Polymer ppm value
or the PTSA ppb value corresponding to the 20 mA output via uPyxis®. For the uPyxis® Mobile App, press
4-20mA Span found on the Calibraon and Reading Screen, shown in Figure 15. For the uPyxis® Desktop
App, click 4-20mA Span found on the Calibraon Screen, shown in Figure 16.
Figure 15.
Figure 16.
7.3 Communicaon using Modbus RTU
The ST-588 sensor is congured as a Modbus slave device. In addion to the Fluorescent Polymer ppm and
PTSA ppb values, many operaonal parameters, including warning and error messages, are available via a
Modbus RTU connecon. Contact Pyxis Lab Customer Service ([email protected]) for more informa-
on.
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