Pyxis ST-601 CLO2 Concentration Sensor User Manual

Pyxis ST-601 CLO2 Concentration Sensor User Manual

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 in-stances, 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 com-petency 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 des-ignate. 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 in-corporation 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 +1 866-203-8397, service@pyxis- lab.com, or by filling out a request for support at https://pyxis-lab.com/request-tech-support/.

Introduction

The Pyxis ST-601 inline sensor is uniquely designed to measure the real-time mass/mass concentration of chlorine dioxide (ClO2). The ST-601 sensor measures the optical absorbance of the ClO2 solution using a UV light source. The sensor has a built-in reference light source and a reference light detector in addition to the main light source and main light detector.
The ST-601 offers an expanded range and a RTD temperature output signal. This features allow the user to measure ClO2 as high as 0.35% (mass/mass) and obtain a temperature measurement, useful when required to consider the impact of atmospheric temperature conditions on variable ClO2 concentration readings.
The ST-601 can be connected to any device that accepts an isolated or non- isolated 4–20mA input or RS-485 Modbus. As with all Pyxis inline sensors, the ST-601 sensor can be wirelessly accessed via Bluetooth when used in conjunction with the MA-WB Bluetooth Adapter or PowerPACK Series Auxiliary Box and the uPyxis® App for mobile and desktop devices. Directions on this wireless calibration capability are included in this manual.

Primary Installation Format
The primary method is to install the probe in-line with the suction side of the chemical feed pump in piping format. This method should ideally run in a vertical line to avoid chlorine gas bubble interference. This can be done with the standard ST-001 Inline Tee Assembly (3/4” FNPT) provided with each sensor. Pyxis also offers 2” and 3” inline tee assemblies as an accessory option if required.

Teflon Tube Installation Format
The second method is to install the probe in-line using the unique 1/4” OD (7 mm OD) clear Teflon tubing adapter 6 inches in length. This tubing can be passed “THROUGH” the optical channel allowing to use the sensor with smaller chemical feed line installations on the suction side of the chemical feed pump.
NOTE For enhanced ambient light interference prevention, Pyxis recommends users to apply black electrical tape or shrink wrap to allow sample darkening prior to and after the optical channel as seen in Figure 3.

Main Features

The ST-601 sensor includes the following features:

• Can be conveniently connected to the suction or discharge side of the bleach pump in both inline Tee (ST-001) or 1/4” Teflon tubing format with using a union; both included with sensor.
• Can be wirelessly calibrated using a known chlorine dioxide concentration standard with the uPyxis® Mobile or Desktop App via a MA-WB Bluetooth/WiFi adapter or PowerPACK Series Auxiliary Box.
• Diagnostic information (sensor tubing fouling and failure modes) can be communicated to digital displays via Modbus RTU.
• Offers an expanded range and a temperature signal communicated via 2-channel 4–20mA outputs and a RS-485 output, Modbus RTU.
• Easy to remove from the system for cleaning and calibration without the need for any tools.

Specifications

Chlorine Dioxide

Concentration Range

| 0–0.35% mass/mass

(RTD Compensated)

Chlorine Dioxide| 0.01%
Concentration|
Resolution| ±           ±
Chlorine Dioxide

Concentration Accuracy

| 2% of reading or   0.1%
Temperature Output

Range

| 4 mA: 32 °F (0 °C),

20 mA: 212 °F (100 °C)

Method| UV Absorbance
Calibration| Two-point calibration against known ClO2 concentration solution
Outputs| 2x 4–20mA Analog Output,

RS-485 Digital Output with Modbus protocol

Installation| 1/4” OD (7 mm) Teflon tubing for measurement flow and custom tee

assembly (P/N: ST-001) with 3/4” female socket & NPT threaded ports

Cable Length| 5 ft with IP67 connectors & 2 ft flying lead with IP67 adapter
Power Supply| 22–26 VDC, 2W
Dimension (L| Dia)| 6.8     1.44 inch (172.7      36.6 mm)
Weight| 0.37 lbs (170 g)
Material| CPVC
Operational

Temperature

| 40–120 °F (4–50 °C)
Storage Temperature| 20–140 °F (-7–60 °C)
Pressure| Up to 100 psi (0.7 MPa)
Enclosure Rating| IP67
Regulation| CE/RoHS

• With Pyxis’s continuous improvement policy, these specifications are subject to change without notice.

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 service@pyxis-lab.com.
Standard Accessories

• Tee Assembly 3/4” NPT (1x Tee, O-ring, and Nut)
• 7-Pin Female Adapter/Flying Leads Cable (2 ft)
• Clear Teflon Tubing 1/4” OD (6”) Adapter
• User Manual available online at https://pyxis-lab.com/support/

Optional Accessories
The following optional accessories can be ordered at order@pyxis- lab.com or the Pyxis E-Store at https://pyxis- lab.com/shop/

Installation

In-line Piping
The provided ST-001 Tee Assembly can be connected to a pipe system through the 3/4” female ports, ei-ther socket or NPT threaded. The ST-001 Tee Assembly should be placed in-line with the suction side of the chemical feed pump. This method should ideally in a vertical line run to avoid chlorine gas bubble interfer-ence. Pyxis also offers 2” and 3” inline tee assemblies as an accessory option if required. To properly install the ST-601 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-601 sensor into the tee.
3. Tighten the tee nut onto the tee to form a water-tight, compression seal.

Teflon Tubing
The provided 1/4” OD (7 mm OD) clear Teflon tubing adapter 6” in length. This tubing can be passed “THROUGH” the optical channel to allow for use of the sensor with smaller chemical feed line installations on the suction side of the chemical feed pump. Users can use conventional 1/4” OD compression fittings to connect desired inlet and outlet bleach line size to the ST-601. This method should ideally in a vertical line run to avoid chlorine gas bubble interference.
NOTE For enhanced ambient light interference prevention, Pyxis recommends users apply black electrical tape or shrink wrap to allow sample darkening prior to and after the optical channel as seen in Figure 3.

Wiring
If insufficient wattage is available from the connected controller (ie. 2.0 W), Pyxis recommends the Power-PACK Series Auxiliary Power & Communication Box highlighted in the Optional Accessories section.
NOTE There is no 4–20mA negative wire to the controller, please connect controller 24V power ground terminal to controller 4–20mA negative terminal with a short wire.
Follow the wiring table below to connect the ST-601 sensor to a controller:

Connecting via Bluetooth
A Bluetooth adapter (P/N: MA-WB) can be used to connect a ST-601 sensor to a smart phone with the uPyxis® Mobile App or a computer with the uPyxis® Desktop App.

Connecting via USB
A USB-RS485 adapter (P/N: MA-485) can be used to connect a ST-601 sensor to a computer with the uPyxis® Desktop App.
NOTE Using non-Pyxis USB-RS485 adapters may result in permanent damage of the ST-601 sensor communication hardware.

Setup and Calibration with uPyxis® Mobile App

Download uPyxis® Mobile App
Download uPyxis® Mobile App from Apple App Store or Google Play.

Connecting to uPyxis® Mobile App
Connect the ST-601 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 connection is successful, the ST-601 and its Serial Number (SN) will be displayed (Figure 7).
4. Press on the ST-601 sensor image.

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.

Diagnosis Screen
From the Diagnosis screen, you can check the diagnosis condition. This feature may be used for technical support when communicating with service@pyxis- lab.com.
To preform a Cleanliness Check, first select the Diagnosis Condition which defines the fluid type that the ST-601 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-601 Sensor section of this manual.

Device Info Screen
From the Device Info screen. You can name the Device or Product as well as set the Modbus address.

Setup and Calibration with uPyxis® Desktop App

Install uPyxis® Desktop App
Download the latest version of uPyxis® Desktop software package from: <https ://pyxis-lab.com/upyxis/> this setup package will download and install the Microsoft.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 application. Double click the uPyxis.Setup.exe file to install.

Click Install to start the installation process. Follow the screen instructions to complete the USB driver and uPyxis® installation.

Connecting to uPyxis® Desktop App
Connect the ST-601 sensor to a Windows computer using either a Bluetooth/USB adapter (P/N: MA-NEB) or a USB-RS485 adapter (P/N: MA-485) according to the following steps:

1. Plug the Bluetooth/USB adapter or USB-RS485 adapter into a USB port in the computer.
2. Launch uPyxis® Desktop App.
3. On uPyxis® Desktop App, click Device Connect via USB-Bluetooth or Connect via USB-RS485 (Fig-ure 12).
4. If the connection is successful, the ST-601 sensor and its Serial Number (SN) 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.

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 Set to save.

Calibration Screen
To calibrate the device, click on Calibration. On the Calibration screen there are three calibration tabs, 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.

Diagnosis Screen
After the device has been calibrated and installation has been completed, to check diagnosis, click on Diag-nosis. 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 service@pyxis-lab.com.
To preform a Cleanliness Check, first select the Diagnosis Condition which defines the fluid type that the ST-601 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-601 Sensor section of this manual.

Outputs

4–20mA Output Setup
The 4–20mA output of the ST-601 sensor is scaled as

• Chlorine Dioxide concentration:
  • 4 mA = 0%
  • 20 mA = 0.35%
• Temperature:
  • 4 mA = 32 °F (0 °C)
  • 20 mA = 212 °F (100 °C)

Adjusting 4–20mA Span
Users may adjust the output scale using 4–20mA Span to change the ClO2 concentration % value corre-sponding to the 20 mA output via uPyxis®. For the uPyxis® Mobile App, press 4-20mA Span found on the Calibration and Reading Screen, shown in Figure 16. For the uPyxis® Desktop App, click 4-20mA Span found on the Calibration Screen, shown in Figure 17.

Communication using Modbus RTU
The ST-601 sensor is configured as a Modbus slave device. In addition to the ClO2 concentration % value, many operational parameters, including warning and error messages, are available via a Modbus RTU con-nection. Contact Pyxis Lab Customer Service (service@pyxis-lab.com) for more information.

Sensor Maintenance and Precaution

The ST-601 sensor is designed to provide reliable and continuous bleach 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-601 sensor is used as part of an automated control system. When used to control product doing,  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-601 sensor is designed to be easily removed, inspected, and cleaned if required. It is suggested that the ST-601 sensor be checked for fouling and cleaned/calibrated on a monthly basis. Heavily contam-inated waters may require more frequent cleanings. Cleaner water sources with less contamination may not require cleaning for several months.

Methods to Cleaning the ST-601
Any equipment in contact with industrial cooling systems is subject to many potential foulants and contaminants. Our inline sensor cleaning solutions below have been shown to remove most common foulants and contaminants. A small, soft bristle brush, Q-Tips cotton swab, or soft cloth may be used to safely clean the sensor housing and the quartz optical sensor channel. These components and more come with a Pyxis Lab Inline Probe Cleaning Solution Kit (P/N: SER-01) which can be purchased at our online Estore/Catalog <https ://pyxis-lab.com/product/probe-cleaning-kit/>

To clean the ST-601 sensor, soak the lower half of the sensor in 100 mL inline sensor cleaning solution for 10 minutes. Rinse the ST-601 sensor with distilled water and then check for the flashing blue light inside the ST-601 sensor quartz tube. If the surface is not entirely clean, continue to soak the ST-601 sensor for an additional 10 minutes. Use the small, soft bristle brush and Q-Tips cotton swabs as necessary to remove any remaining contaminants in the ST-601 sensor quartz tube.

Storage
Avoid long term storage at temperature over 100 °F. In an outdoor installation, properly shield the ST-601 sensor from direct sunlight and precipitation.

Troubleshooting

If the ST-601 sensor output signal is not stable and fluctuates significantly, make an additional ground con-nection –– connect the clear (shield, earth ground) wire to a conductor that contacts the sample water electrically such as a metal pipe adjacent to the ST-601 tee. Carry out routine calibration verification against a known ClO2 concentration solution. After properly clean-ing the ST-601 sensor, carry out the zero point calibration with distilled water and slope calibration using the known ClO2 concentration solution.

Contact Us
Pyxis Lab, Inc
1729 Majestic Dr. Suite 5
Lafayette, CO 80026 USA
www.pyxis-lab.com
Phone: +1 866-203-8397
Email: service@pyxis-lab.com

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