Pyxis ST-500 User manual
Table of Contents
1 Introducon 2
2 Specicaons 2
3 Unpacking Instrument 3
3.1 StandardAccessories ..................................... 3
3.2 OponalAccessories ..................................... 3
4 Installaon 5
4.1 ST-500andST-500ROPiping ................................. 5
4.2 ST-500SSPiping ........................................ 6
4.3 Wiring............................................. 7
4.4 ConnecngviaBluetooth................................... 7
4.5 ConnecngviaUSB ...................................... 8
5 Setup and Calibraon with uPyxis® Mobile App 8
5.1 Download uPyxis® MobileApp................................ 8
5.2 Connecng to uPyxis® MobileApp.............................. 9
5.3 Calibraon Screen and Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4 DiagnosisScreen ....................................... 11
5.5 DeviceInfoScreen....................................... 12
6 Setup and Calibraon with uPyxis® Desktop App 12
6.1 Install uPyxis® DesktopApp.................................. 12
6.2 Connecng to uPyxis® DesktopApp ............................. 13
6.3 InformaonScreen ...................................... 14
6.4 CalibraonScreen....................................... 14
6.5 DiagnosisScreen ....................................... 15
7 Outputs 15
7.1 4–20mAOutputSetup .................................... 15
7.2 Communicaon using Modbus RTU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8 Sensor Maintenance and Precauon 16
8.1 Methods to Cleaning the ST-500 Series Sensor . . . . . . . . . . . . . . . . . . . . . . . . 16
8.2 Storage ............................................ 17
9 Troubleshoong 17
10 Contact Us 17
Warranty Informaon
Condenality
The informaon contained in this manual may be condenal and proprietary and is the property of Pyxis
Lab, Inc. Informaon disclosed herein shall not be used to manufacture, construct, or otherwise reproduce
the goods described. Informaon disclosed herein shall not be disclosed to others or made public in any
manner without the express wrien consent of Pyxis Lab, Inc.
Standard Limited Warranty
Pyxis Lab warrants its products for defects in materials and workmanship. Pyxis Lab will, at its opon, repair
or replace instrument components that prove to be defecve with new or remanufactured components
(i.e., equivalent to new). The warranty set forth is exclusive and no other warranty, whether wrien 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 dysfunconal instruments may be returned to Pyxis for repair or replacement. In some in-
stances, replacement instruments may be available for short duraon loan or lease.
Pyxis warrants that any labor services provided shall conform to the reasonable standards of technical com-
petency and performance eecve at the me of delivery. All service intervenons are to be reviewed and
authorized as correct and complete at the compleon of the service by a customer representave, or des-
ignate. Pyxis warrants these services for 30 days aer the authorizaon and will correct any qualifying
deciency in labor provided that the labor service deciency is exactly related to the originang 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-
corporaon of a warranted repair component into an instrument extend the whole instrument’s warranty
beyond its original term.
Warranty Shipping
A Repair Authorizaon (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 hps://pyxis-lab.com/request-tech-support/.
Pyxis Technical Support
Contact Pyxis Technical Support at +1 (866) 203-8397, [email protected], or by lling out a request for
support at hps://pyxis-lab.com/request-tech-support/.
1 Introducon
The Pyxis ST-500 Series inline uorometer sensor measures the concentraon of uorescence tracer PTSA
(pyrenetetrasulfonic acid) in water. The standard ST-001 Tee Assembly provided with each ST-500/ST-500RO
sensor, has two 3/4” female NPT ports and can be placed to an exisng 3/4” sample water line. Pyxis Lab
also oers 2” and 3” Tee formats for larger ow installaons. The 4–20mA current output of the ST-500 Se-
ries sensor can be connected to any controller that accepts an isolated or non-isolated 4–20mA input. The
ST-500 Series sensor is a smart device. In addion to measuring uorescence, the ST-500 Series sensor has
an extra photo-electric components that monitors the color and turbidity of the sample water. This extra
feature allows automac color and turbidity compensaon to eliminate interference commonly associated
with real-world waters.
The Pyxis ST-500 Series sensor has a short uidic channel and can be easily cleaned. The uidic and op-
cal arrangement of the ST-500 Series sensor is designed to overcome shortcomings associated with other
uorometers that have a distal sensor surface or a long, narrow uidic cell. Tradional inline uorometers
are suscepble to color, turbidity interference, and fouling, making them very dicult to properly clean.
The Pyxis ST-500 Series sensor uses a narrow wavelength band gallium phosphide photodiode and high
temperature-tolerant and humidity-resistant opcal lters. This combinaon greatly enhances the robust-
ness of the sensor. It can be operated under a wide range of ambient condions without the need of humid-
ity and temperature regulaon. The performance of the ST-500 Series sensor can be stable and consistent
for a long period of me.
2 Specicaons
Table 1. ST-500 Series Specicaons
Specicaon*ST-500 ST-500RO ST-500SS
P/N 50661 50669 50700
Range 0–300 ppb 0–40 ppb 0–300 ppb
Resoluon 0.01 ppb
Accuracy ±1% of reading
Calibraon Two-point calibraon against standard soluon
Outputs 4–20mA Analog Output, RS-485 Digital Output with Modbus protocol
Installaon
Custom tee assembly (P/N:
ST-001) with 3/4” FNPT socket
& threaded ports
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
Power Supply 22–26 VDC, 1 W
Dimension (L ×
Dia)†6.8 ×1.44 inch (172.7 ×36.6 mm)
Weight 0.37 lbs (170 g) 0.37 lbs (170 g) 2.5 lbs (1130 g)
Material CPVC CPVC 304 Stainless Steel
Operaonal
Temperature 40–120 °F (4–49 °C)
Storage
Temperature -4–140 °F (-20–60 °C)
Pressure Up to 100 psi (0.7 MPa) Up to 100 psi (0.7 MPa) Up to 290 psi (2.0 MPa) at 149
°F (65 °C)
Specicaon*ST-500 ST-500RO ST-500SS
Enclosure Rang IP67
Regulaon CE
*With Pyxis’s connuous improvement policy, these specicaons are subject to change without noce.
†See Figure 3 for ST-500SS dimensions.
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
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-500SS
• 7-Pin Female Adapter/Flying Leads Cable (2 ) P/N: MA-1100
• User Manual available online at hps://pyxis-lab.com/support/
3.2 Oponal Accessories
4 Installaon
4.1 ST-500 and ST-500RO 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-500/ST-500RO 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-500/ST-500RO sensor into the tee.
3. Tighten the tee nut onto the tee to form a water-ght, compression seal.
Figure 3. Dimension of the ST-500/ST-500RO and the ST-001 Tee Assembly (mm)
4.2 ST-500SS Piping
The ST-500SS 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 3 for ST-500SS dimensions.
Figure 4. Dimension of the ST-500SS (inch)
4.3 Wiring
If the power ground terminal and the negave 4–20mA terminal in the controller are internally connected
(non-isolated 4–20mA input), it is unnecessary to connect the 4–20mA negave wire (green) to the 4–20mA
negave 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 @ 65mA.
*NOTE*The negave 24V power terminal (power ground) and the negave 4–20mA ter-
minal on the ST-500 Series sensor are internally connected.
Follow the wiring table below to connect the ST-500 Series sensor to a controller:
Table 2.
Wire Color Designaon
Red 24V +
Black 24V Power ground
White 4–20mA +
Green*4–20mA -
Blue RS-485 A
Yellow RS-485 B
Clear Shield, earth ground
*Internally connected to the power
ground
4.4 Connecng via Bluetooth
A Bluetooth adapter (P/N: MA-WB) can be used to connect a ST-500 Series 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.
Figure 5. Bluetooth connecon to ST-500 Series sensor
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