Pyxis ST-600 Quick start guide

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ST-600 Inline Bleach
Concentration Monitoring Probe
Operational Manual
Version 1.2 October 2018

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Table of Contents
1. Introduction 4
2. Unpacking the Instrument 4
2.1.Optional Accessories 4
3. Specifications 5
4. Installation 5
4.1.Quick 4-20 mA Start 6
4.2.Connect via USB 7
4.3. Connect via WiFi/Bluetooth 8
5. Probe Calibration with uPyxis Mobile App 8
5.1. Download uPyxis Mobile App 8
5.2. Connected to uPyxis Mobile App 9
5.3. Calibration Screen and Reading 9
5.4. Diagnosis Screen 10
5.5. Device Info Screen 10
6. Probe Calibration with uPyxis Desktop App 11
6.1. Download uPyxis Desktop App 11
6.2. UnZip uPyxis Desktop App 12
6.3. Installing uPyxis Desktop App 13
6.4. Connecting uPyxis Desktop App 14
6.5. Connecting to Device 15
6.6. Diagnosis Screen 16
6.7. Calibrating Device 16
6.8. Zero Calibration 17
6.9. Slope Calibration 17
6.10. 4-20mA Span 18
7. Calibration on the Controller 18
8. Communicating using Modbus RTU 18
9. Probe Cleaning and Maintenance 19
10. How to Clean ST-600 Probe 19

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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 in the course of 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.
Shipping
A Repair Authorization Number (RA) must be obtained from Pyxis Technical Support, contact technical
support at [e-mail] 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.

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1. Introduction
The Pyxis ST-600 inline probe measures the concentration of bleach (sodium hypochlorite). The ST-600
probe measures the optical density of the beach solution using a near UV light. The probe has a built-in
reference light source and a reference light detector in addition to the main light source and main light
detector. The wet part of the probe is a 6-inch long, 7 mm OD Teflon tubing. This configuration ensures
long-term stable measurement of the bleach concentration. The ST-600 probe can be connected to any
device that accepts an isolated or non-isolated 4-20mA input. Other features of the Pyxis ST-600 probe
include:
•The probe can be conveniently connected to the suction or discharge side of the bleach pump
tubing with using a union or a quick push-in connector.
•The ST-600 can be calibrated with a PC or smart phone app via a Bluetooth/Wifi adaptor.
•Diagnostic information (probe tubing fouling and failure modes) can be communicated to digital
displays via Modbus RTU.
2. Unpacking the 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 servic[email protected]m.
2.1. Optional Accessories
•Bluetooth/Wifi Adapter (Item Number: MA-WB)
•Extension cable –50 feet (PN:50705)
•Extension cable –100 feet (PN:5070)

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3. Specification
•Power Supply Required: 24 (±2) VDC @ 65 mA
•Signal Output: 4-20 mA and RS-485 Modbus RTU
•Temperature, Sample Water: 40 –104 °F (4 –40 °C)
•Temperature, Ambient during operation: 40 –120 °F (4 –49 °C)
•Temperature, Ambient during storage: 20 –140 °F(-7 –60 °C)
•Sample Pressure: 100 PSI
•Cable Length: 5 feet, terminated with IP67 connectors
•Water proof connector
•Dimension: Length 6.8 inch (172.7 mm), body diameter 1.44 inch (36.6 mm)
•Weight: 0.37 pounds (170 grams)
•Measurement Range: 0.1 to 15% bleach
•Regulatory: CE Marked
4. Installation
Use a 7-mm compression fitting union to connect the probe Teflon tubing to the bleach sample tubing
system. A ¼ inch push-in union connector can be used to connect the probe Teflon tubing to a different
outside diameter tubing.

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Figure 1. ST-600 Bleach Concentration Probe
4.1. Quick 4-20mA Start
Note: The negative 24V power terminal (power ground) and the negative 4-20 mA terminal on the ST-
600 probe are internally connected.
If the power ground terminal and the negative 4-20 mA terminal in the controller are internally
connected (non-isolated 4-20mA input), it is unnecessary to connect the 4-20 mA negative wire (blue) to
the 4-20 mA negative terminal in the controller. If a separate DC power supplier other than that from
the controller is used, make sure that the output from the power supply is rated for 22-26 VDC @ 65mA.

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Follow the wiring table below to connect the ST-600 probe to a controller.
Wire Color Designation
Red 24 V
Black Power ground
White 4-20 mA +
Green 4-20 mA - Internally connected to the power ground
Blue RS-485 A
Yellow RS-485 B
Clear Shield, solution ground
4.2. Connect via WiFi/Bluetooth
Figure 2 shows the connection between a computer and the ST-600 probe via WiFi/Bluetooth adapter
(P/N: MA-WB). A smart phone app is provided to connect the ST-600 probe to your smart phone via
WiFi or Bluetooth interface.
Figure 2. ST-600 connected to uPyxis Mobile App or uPyxis Desktop App

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4.3. Connect via USB
Figure 3 shows the connection between a computer and the ST-600 probe via USB-RS485 adapter. Use
the USB-RS485 adapter provided by Pyxis Lab Inc. (Item Number: MA-485). Using other USB-485
adapters may result in permanent damage of the ST-600 probe communication hardware.
Figure 3. ST-600 connected to uPyxis Desktop App via USB-485 adaptor
5. Probe Calibration with uPyxis Mobile App
5.1. Downloading uPyxis Mobile App
Download uPyxis Mobile App from Apple App Store or Google Play

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5.2. Connecting to uPyxis Mobile App
Turn on Bluetooth on your mobile phone (Do not pair the phone Bluetooth to the ST-600). Open uPyxis
Mobile App. uPxis App connects to the Probe and click on the ST-600 probe.
5.3. Calibration Screen and Reading
When connected, Mobile App will default to the Calibration screen. From the Calibration screen you can
perform calibrations by pressing on Zero Calibration, Slope Calibration, and 4-20 mA Span. Follow the
screen instructions for each calibration step. Note: Auto Setup is only use if you have the Teflon tubing
installed into the probe.

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5.4. Diagnosis Screen
From the Diagnosis screen. You can check the Diagnosis Condition, and Export & Upload.
5.5. Device Info Screen
From the Device Info screen. You can name the Device or Product.

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6. Probe Calibration with uPyxis Desktop App
6.1. Download uPyxis Desktop App
Download uPyxis Desktop App from https://pyxis-lab.com/support-2/

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6.2. UnZip uPyxis Desktop App
Find your downloaded uPyxis Setup 1.3.8 file, Right Click on the file, Extract All, and then Extract.

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6.3. Installing uPyxis Desktop App
Once the uPyxis Desktop App has been extracted. Find the extracted uPyxis Setup file and left click, click
on Run, and then click Install. After install has been clicked the Setup Progress will continue. Follow the
step during installation process.

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6.4. Connecting to uPyxis Desktop App
Open uPyxis Desktop App on your desktop. When the desktop app opens, to find your device, click on
Device, then Connect via WiFi.

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6.5. Connecting to Device
When connected via WiFi, in the Discovered Devices box there will be the device product name (If no
device product name in the Discovered Devices box, click Refresh). If device product name shows in the
box, then click on Connect to Device. Once connected to the device on the main screen a picture of the
device will appear on the top left corner. On the main screen you can set the information description
for Device Name and Product Name, then click Set to save.

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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.
6.7. Calibrating Device
To calibrate the device, click on Calibration. On the Calibration screen there are three calibration tabs,
Zero Calibration, Slope Calibration, and 4-20 mA Span. The screen does also display the reading of the
device. The reading refreshed rate is every 4 seconds. Note: Auto Setup is only use when you have the
Teflon Tube installed into the probe.

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6.8. Zero Calibration
To perform Zero Calibration, click on Zero Calibration. Then follow the instruction on how to calibrate,
then click Ok.
6.9. Slope Calibration
To perform Slope Calibration, click on Slope Calibration. Then follow the instruction on how to calibrate,
then click Slope Calibration.

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6.10. 4-20 mA Span
To perform 4-20 mA Span, click on 4-20 mA Span. Then follow the instruction on how to calibrate, then
click 4-20 mA Span.
7. Calibration on the Controller
With the default probe settings, the controller should be set up to convert 4 mA to 0% and 20 mA to
16%. Additionally, the ST-600 probe can be calibrated by changing the conversion factor on the
controller without performing the zero point and slope calibration steps.
8. Communicating using Modbus RTU
The ST-600 probe is configured as a Modbus slave device. In addition to the NTU 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.

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9. Probe Cleaning and Maintenance
It is rare that the probe Teflon tubing needs to be cleaned or replaced. However, a replacement tubing
with the proper socket fitting to fix the tubing to the probe body can be purchased from Pyxis. It is
recommended that the ST-600 probe is calibrated monthly with using DI and a bleach standard solution.
It is rare that the probe Teflon tubing needs to be cleaned or replaced. However, a replacement tubing
with the proper socket fitting to fix the tubing to the probe body can be purchased from Pyxis.
It is recommended that the ST-600 probe is calibrated monthly with using DI and a bleach standard
solution.
10. How to Clean ST-600 Probe
Soak the lower half of the ST-600 probe in 100 ml inline probe cleaning solution for 30 minutes. Rinse
the ST-600 probe with distilled water and then check for the flashing blue light inside the ST-600 probe
quartz tube. If the surface is not entirely clean, continue to soak the ST-600 probe for an additional 30
minutes. Pyxis Lab Inline Probe Cleaning Solution can be purchased at our online Estore/Catalog
https://pyxis-lab.com/product-catergory/accessories/page/2/.