Pyxis ST-565T HST or TTA Inline Sensors User Manual
- June 6, 2024
- Pyxis
Table of Contents
Pyxis ST-565T HST or TTA Inline Sensors
Optional Accessories
The following optional accessories can be ordered from Pyxis Customer Service
(order@pyxis-lab.com) or Pyxis E-Store at https://pyxis-
lab.com/shop/.
Installation
Piping
The ST-565 Series sensor can be installed in an inline flow application
using the included Pyxis ST-001 Inline Tee Assembly. The ST-001 offers 3/4”
FNPT thread or socket weld adapters with unions for easy installation and
sensor maintenance. To properly install the ST-565 Series sensor into the
ST-001 Tee Assembly, follow the steps below:
- Insert the provided O-ring into the O-ring groove on the tee.
- Insert the ST-565 Series sensor into the tee.
- Tighten the tee nut onto the tee to form a water-tight, compression seal.
Wiring
If the power ground terminal and the negative 4–20mA terminal in the
controller are internally connected (non-isolated 4–20mA input), it is
unnecessary to connect the 4–20mA negative wire (green) to the 4–20mA negative
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 @ 65 mA.
- NOTE * The negative 24V power terminal (power ground) and the negative 4–20mA terminal on the ST-565 Series sensor are internally connected. Follow the wiring table below to connect the ST-565 Series sensor to a controller:
Table 2.
Wire Color Designation
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.
Connecting via Bluetooth
A Bluetooth adapter (P/N: MA-WB) can be used to connect a ST-565 Series 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-565 Series sensor to a computer with the uPyxis® Desktop App.
- NOTE * Using non-Pyxis USB-RS485 adapters may result in permanent damage of the ST- 565 Series 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-565 Series sensor to a mobile smart phone according to the
following steps:
- Open uPyxis® Mobile App.
- On uPyxis® Mobile App, pull down to refresh the list of available Pyxis devices.
- If the connection is successful, the ST-565 Series and its Serial Number (SN) will be displayed (Figure 6).
- Press on the ST-565 Series sensor image.
Calibration Screen and Reading
When connected, the uPyxis® Mobile App will default to the Calibration screen.
From the Calibrationscreen, 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 as well as
Send to Pyxis. This feature may be used for technical support when
communicating with service@pyxislab.com.To
preform a sensor Cleanliness Check, first select the Diagnosis Condition which
defines the fluid type that the ST-565 Series sensor in currently measuring,
then press Cleanliness Check. If the sensor is clean, a green Clean message
will be shown. If the sensor is partially fouled, a yellow Becoming Dirty
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-565 Series 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-565 Series sensor to a Windows computer using either a Bluetooth/USB adapter (P/N: MANEB) or a USB-RS485 adapter (P/N: MA-485) according to the following steps:
- Plug the Bluetooth/USB adapter or USB-RS485 adapter into a USB port in the computer.
- Launch uPyxis® Desktop App.
- On uPyxis® Desktop App, click Device Connect via USB-Bluetooth or Connect via USB-RS485 (Figure 12).
- If the connection is successful, the ST-565 Series 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
Apply Settings 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 Sp
an. The screen also displays the reading of the de vice. 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 Diagnosis. 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.
Outputs
4–20mA Output Setup
The 4–20mA output of the ST-565 sensor is scaled as:
- Halogenated Tolytriazole (HST):
- 4 mA = 0 ppm
- 20 mA = 7.5 ppm
The 4–20mA output of the ST-565T sensor is scaled as:
- Tolytriazole (TTA):
- 4 mA = 0 ppm
- 20 mA = 10.0 ppm
Adjusting 4–20mA Span
Users may adjust the output scale using 4–20mA Span to change the HST or TTA
ppm value corresponding 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-565 Series sensor is configured as a Modbus slave d evice. In addition to the HST or TTA ppm values, many operational parameters, including warning and error messages, are available via a Modbus RTU connection. Contact Pyxis Lab Customer Service (service@pyxis-lab.com) for more information.
Sensor Maintenance and Precaution
The ST-565 Series sensor is designed to provide reliable and continuous HST or
TTA 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-565
Series sensor is used as part of an automated control system. When used to
control product dosing, 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-565 Series sensor is designed to be easily
removed, inspected, and cleaned if required. It is suggested that the ST-565
Series sensor be checked for fouling and cleaned/calibrated on a monthly
basis. Heavily contaminated waters may require more frequent cleanings.
Cleaner water sources with less contamination may not require cleaning for
several months. The need to clean the ST-565 Series sensor can be determined
by the Cleanliness Check using the uPyxis® Mobile App (see the Mobile
Diagnosis Screen section).
Methods to Cleaning the ST-565 Series Sensor
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 E-Store
https://pyxislab.com/product/probe-cleaning-kit/
To clean the ST-565 Series sensor, soak the lower half of the sensor in 100 mL inline sensor cleaning solution for 10 minutes. Rinse the ST-565 Series sensor with distilled water and then check for the flashing blue light inside the ST-565 Series sensor quartz tube. If the surface is not entirely clean, continue to soak the ST-565 Series 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-565 Series sensor quartz tube.
Storage
Avoid long term storage at temperature over 100 °F. In an outdoor
installation, properly shield the ST-565 Series sensor from direct sunlight
and precipitation.
Troubleshooting
If the ST-565 Series sensor output signal is not stable and fluctuates significantly, make an additional ground connection –– 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-565 Series tee.
Carry out routine calibration verification against a qualified Halogenated Tolytriazole (HST with ST-565) or Tolytriazole (TTA with ST-565T) standard. After properly cleaning the ST-565 Series sensor, carry out the zero point calibration with distilled water and slope calibration using the qualified standard. Pyxis Lab HST Calibration Standard can be purchased at our online Estore/Catalog https://pyxis-lab.com/product/halogenstable-triazole- calibration-standards/. Pyxis Lab TTA Calibration Standard can be purchased at our online Estore/Catalog https://pyxis-lab.com/product/tta-standards/.
Contact Us
Pyxis Lab, Inc
1729 Majestic Dr. Suite 5
Lafayette, CO 80026 USA
www.pyxis-lab.com
Phone: +1866-203-8397
Email:service@pyxis-lab.com
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