Pyxis ST-711SS User manual

ST-711SS User Manual [email protected] | [phone]

ST-711SS Stainless Steel ORP Sensor
User Manual
January 14, 2022
Rev. 1.02
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4 Installaon 5
4.1 Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.3 Connecng via Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Setup and Calibraon with uPyxis® Mobile App 7
5.1 Download uPyxis® Mobile App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.2 Connecng to uPyxis® Mobile App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.3 Calibraon Screen and Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.4 Diagnosis Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.5 Device Info Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6 Setup and Calibraon with uPyxis® Desktop App 11
6.1 Install uPyxis® Desktop App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.2 Connecng to uPyxis® Desktop App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.3 Informaon Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.4 Calibraon Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.5 Diagnosis Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7 Outputs 15
7.1 4–20mA Output Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.2 Communicaon using Modbus RTU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8 Sensor Maintenance and Precauon 15
8.1 Methods to Cleaning the ST-711SS Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.2 Replacing ORP Electrode Head (EH-711) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
9 Troubleshoong 17
10 Contact Us 17

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-711SS User Manual [email protected] | [phone]

1 Introducon
Pyxis ST-711SS is a unique, digital ORP smart sensor based on electrochemical principles to determine ORP
in water. The ST-711SS ORP sensor features an oversized planum electrode and is opmally designed for
increased fouling resistance. The large capacity salt bridge ensures a highly accurate, long-life sensor with
dramacally reduced eld maintenance. The ST-711SS sensor oers an easily replaceable, front loading
electrode head (EH-711) that has been independently developed by Pyxis Lab. The at front-end design of
the ST-711SS makes this plaorm less prone to contaminaon and fouling and is easy to clean. The ST-711SS
sensor body is composed of 304 stainless steel and is well suited for aggressive industrial applicaons. The
ST-711SS sensor oers both 4-20mA and RS-485 Modbus fully integrated output signals and is Bluetooth
enabled when used in conjuncon with the MA-CR Bluetooth Adapter for wireless data trending, diagnoscs
and calibraon via the uPyxis® Mobile or Desktop App.
1.1 Main Features
The ST-711SS sensor includes the following features:
• Easily replaceable electrode head (EH-711)
• Accurate and stable measurement with ultra-low dri
• Built-in transmier without preamplier or meter head
• Dual Outputs both 4-20mA isolated signal or RS-485 Modbus
• Long-distance transmission with higher stability & accuracy
• Wireless Calibraon, Diagnoscs, Data Trend via uPyxis® App when used with MA-CR Adapter
ST-711SS User Manual [email protected] | [phone]

2 Specicaons
Table 1. ST-711SS Specicaons
Specicaon*ST-711SS
Part Number
(P/N)
53031
ORP Range ±1500 mV
Precision ±1 mV or 1% of the value
Response
Time
95% within 5 seconds
Power Supply 22–26V DC, Power Consumpon 2W
Storage
Temperature
-7–60 °C (20–140 °F)
Outputs Isolated 4–20 mA Analog Output & isolated RS-485 Digital Output
Dimension (L
×W×H)
Length 6.8 inch (172.7 mm), body diameter 1.44 Inch (36.6 mm)
Installaon ST-001 Inline Tee (provided) 3/4” FNPT Glue & Thread
Body Material 304 stainless steel
Weight 530 g (1.16 lbs)
Operaonal
Pressure
100 psi (6.9 bar)
Operang
Temperature
4–40 °C (40–104 °F)
Wet Material Quartz & UPVC
Rang IP67, Fully Dustproof & Waterproof
Regulaon CE Marked
Cable
Included
MA-4.9CR Cable (8Pin Male/Female Adapters — 4.9)
MA-1.5CR Cable (8 Pin Male Adapter / Flying Leads — 4.9)
Addional Extension Cables Available
Typical
Service Life †
2 years
*With Pyxis’s connuous improvement policy, these specicaons are subject to change without noce.
†Typical life is the sensor at 25 °C temperature under normal use condions to measure clear water; harsh working
condions or water quality may shorten life.
ST-711SS User Manual [email protected] | [phone]

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
• One ST-711SS sensor with one ST-001 (CPVC) Inline Tee Assembly
• One MA-4.9CR — (Standard Cable / Male-Female 8-Pin Adapters — 4.9ft)
• One MA-1.5CR — (Flying Lead Cable / Male 8-Pin Adapter and Flying Leads — 4.9ft)
• User Manual available online at https://pyxis-lab.com/support/
3.2 Oponal Accessories
The following oponal accessories can be ordered from Pyxis Customer Service ([e-mail]) or
Pyxis E-Store at hps://pyxis-lab.com/shop/.
Table 2. Oponal Accessories
ST-711SS User Manual [email protected] | [phone]
Accessory Name/Description Part Number
EH-711
(Replacement ORP Electrode Head for ST-711SS) 53034
ST-007
(Stainless Steel Inline Tee Assembly ¼-inch Swagelok Inlet/Outlet) 50700-A51
MA-CR
(Bluetooth Adapter For use with Pyxis 8-Pin Sensors) MA-CR
MA-NEB
(USB Bluetooth Adapter for use with Laptop or Desktop) MA-NEB
MA-50CR
(8-Pin Extension Cable-50 feet)
50743
PowerPACK-1
(Single Channel Powered Bluetooth Adapter w 1x 4-20mA Pass Through) MA-BLE-1
ORP-200mV Calibration Standard Solution
(Calibration Solution 500mL) 57020

4 Installaon
Figure 1. Dimension of the ST-711SS sensor (mm)
4.1 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-711SS 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-711SS sensor into the tee.
3. Tighten the tee nut onto the tee to form a water-ght, compression seal.
Figure 2. Installaon structure diagram of ST-711SS
ST-711SS User Manual [email protected] | [phone]

4.2 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-711SS sensor are internally connected.
Follow the wiring table below to connect the ST-711SS sensor to a controller:
Table 3.
Wire Color Designaon
Red 24V +
Brown 24V Power ground
White Not Ulized (NA)
Gray*4–20mA -
Blue RS-485 A
Yellow RS-485 B
Pink ORP 4–20mA +
Green Earth ground
Black Shield, soluon ground
*Internally connected to the power ground
4.3 Connecng via Bluetooth
Connect and power the ST-711SS sensor with the Pyxis Bluetooth adapter (P/N: MA-CR) installed as shown
in the following connecon diagram. The power should be sourced from a 24 VDC power terminal of a
controller. If a controller is not available, please purchase a 24 V power supply. Alternavely, you may pur-
chase a Pyxis PowerPACK-1 Auxiliary Bluetooth Adapter that can provide power supply, Bluetooth access,
and 4-20mA signal passthrough to the ST-711SS sensor. See Oponal Accessories secon for details.
Figure 3. Bluetooth connection to ST-710SS sensor with MA-CR and uPyxis Mobile App.
ST-711SS User Manual [email protected] | [phone]

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 4. uPyxis® Mobile App installaon
ST-711SS User Manual [email protected] | [phone]

5.2 Connecng to uPyxis® Mobile App
Connect the ST-711SS 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-711SS and its Serial Number (SN) will be displayed (Figure 5).
4. Press on the ST-711SS sensor image.
Figure 5.
ST-711SS User Manual [email protected] | [phone]

5.3 Calibraon Screen and Reading
The ST-711SS ORP sensor is rigorously calibrated before leaving the Pyxis factory. As such, users should not
need to calibrate the sensor for a period of three months up to one year if the sensor is maintained in clean
operable condion. In applicaons where the sensor may become dirty or fouled (i.e. Cooling Towers) users
can calibrate the sensor according to their needs and as desired.
The ST-711SS sensor requires an oset calibraon for ORP. The ORP can be calibrated with a standard so-
luon containing a known ORP (i.e. Pyxis ORP-200mV Calibraon Soluon) or with the sample water itself.
The ORP of the sample water should be determined with a properly calibrated benchtop or portable ORP
analyzer, such as the Pyxis SP-600 (Portable Water Mulmeter). Before calibraon, the ST-711SS sensor
should be cleaned with Pyxis Probe Cleaning Soluon (P/N: SER-01) if heavily fouled then thoroughly rinsed
with deionized water taking special care to avoid direct contact with the electrode by the ngers or hand.
When connected, the uPyxis® Mobile App will default to the Calibraon screen. From the Calibraon
screen, you can perform a calibraon by pressing on Calibraon. Follow the screen instrucons for each
calibraon step.
Figure 6.
ST-711SS User Manual [email protected] | [phone]

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].
Figure 7.
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 8.
ST-711SS User Manual [email protected] | [phone]

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 installation
Click Install to start the installaon process. Follow the screen instrucons to complete the USB driver and
uPyxis® installaon.
ST-711SS User Manual [email protected] | [phone]
Figure 9. Bluetooth connection to ST-710SS Sensor with MA-CR and MA-NEB and uPyxis Desktop.

6.2 Connecng to uPyxis® Desktop App
Connect the ST-711SS sensor to a Windows computer using a Bluetooth/USB adapter (P/N: MA-NEB) ac-
cording 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 10).
4. If the connecon is successful, the ST-711SS 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.
ST-711SS User Manual [email protected] | [phone]

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 Set to save.
Figure 12.
ST-711SS User Manual [email protected] | [phone]

6.4 Calibraon Screen
The ST-711SS ORP sensor is rigorously calibrated before leaving the Pyxis factory. As such, users should not
need to calibrate the sensor for a period of three months up to one year if the sensor is maintained in clean
operable condion. In applicaons where the sensor may become dirty or fouled (i.e. Cooling Towers) users
can calibrate the sensor according to their needs and as desired.
The ST-711SS sensor requires an oset calibraon for ORP. The ORP can be calibrated with a standard so-
luon containing a known ORP (i.e. Pyxis ORP-200mV Calibraon Soluon) or with the sample water itself.
The ORP of the sample water should be determined with a properly calibrated benchtop or portable ORP
analyzer, such as the Pyxis SP-600 (Portable Water Mulmeter). Before calibraon, the ST-711SS sensor
should be cleaned with Pyxis Probe Cleaning Soluon (P/N: SER-01) if heavily fouled then thoroughly rinsed
with deionized water taking special care to avoid direct contact with the electrode by the ngers or hand.
To calibrate the device, click on Calibraon. On the Calibraon screen there is a calibraon buon, ORP
Calibraon. The screen also displays the reading of the device. The reading refresh rate is every 4 seconds.
Follow the screen instrucons for each calibraon step.
Figure 13.
ST-711SS User Manual [email protected] | [phone]

6.5 Diagnosis Screen
Aer the device has been calibrated and installaon has been completed, to check diagnosis, click on Diag-
nosis. 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 [email protected].
Figure 14.
7 Outputs
7.1 4–20mA Output Setup
The 4–20mA output of the ST-711SS sensor is scaled as:
• ORP:
–4 mA = -1500 mV
–20 mA = 1500 mV
7.2 Communicaon using Modbus RTU
The ST-711SS sensor is congured as a Modbus slave device. In addion to the ORP mV value, many op-
era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.
8 Sensor Maintenance and Precauon
8.1 Methods to Cleaning the ST-711SS Sensor
Any equipment in contact with industrial cooling systems is subject to many potenal foulants and contam-
inants. Our inline sensor cleaning soluons below have been shown to remove most common foulants and
contaminants. A small, so bristle brush, Q-Tips coon swab, or so cloth may be used to safely clean the
sensor housing and the quartz opcal sensor channel. These components and more come with a Pyxis Lab
Inline Probe Cleaning Soluon Kit (P/N: SER-01) which can be purchased at our online E-Store hps://pyxis-
lab.com/product/st-series-probe-cleaning-kit/
ST-711SS User Manual [email protected] | [phone]

Figure 15. Inline Probe Cleaning Solution Kit
To clean the ST-711SS sensor, soak the lower half of the sensor in 100 mL inline sensor cleaning soluon for
10–15 minutes. Rinse the ST-711SS sensor with dislled water. If the surface is not enrely clean, connue
to soak the ST-711SS sensor for an addional 10–15 m inutes. Use the small, so bristle brush and Q-Tips
coon swabs as necessary to remove any remaining contaminants on the ST-711SS sensor surface.
8.2 Replacing ORP Electrode Head (EH-711)
The ORP electrode head of ST-711SS can be purchased as a spare accessory under the name EH-711 (P/N:
53034) can be replaced when the original electrode head reaches the end of its working life. Order a re-
placement electrode head (EH-711) from Pyxis and follow instrucons as below:
1. Turn o the sensor if it is powered on.
2. Make sure there is no water on the sensor.
3. Hold the ST-711SS main body with one hand and use the other hand to twist the stainless-steel locking
ring connecting the black electrode counterclockwise, until the front end of the black electrode is
completely unscrewed, as shown in Figure 16-2.
4. Pull out the electrode head as show in Figure 16-3.
5. Gently loosen the electrode plug connector and remove the electrode head as show in Figure 16-4.
6. To assemble the new electrode head, gently insert the plug connector and push the wires into the
main housing. Gently insert the new electrode head into the sensor main body. The two protrusions
on the electrode head should be aligned with the notch in the sensor main housing.
7. Then twist the stainless-steel lock ring of ST-711SS in a clockwise direction until the threads of the
electrode head basically enter the ST-711SS housing, as shown in 16-1.
ST-711SS User Manual [email protected] | [phone]

Figure 16. Replacing EH-711 — ORP Electrode Head
9 Troubleshoong
If the ST-711SS sensor output signal is not stable and uctuates signicantly, make an addional ground
connecon — connect the black (shield, soluon ground) wire to a conductor that contacts the sample wa-
ter electrically such as a metal pipe adjacent to the ST-711SS tee.
10 Contact Us
Pyxis Lab, Inc
1729 Majesc Dr. Suite 5
Lafayee, CO 80026 USA
www.pyxis-lab.com
Phone: [phone]
Email: [email protected]
ST-711SS User Manual [email protected] | [phone]