Chemtrol Pyxis ST-730 Series Operation Manual

ST-730 Series Inline

Turbidity Probe

Operation Manual

1

Version 1.2 August 2018

Table of Content

1. Introduction 3

2. Unpacking the Instrument 3

2.1. Standard Accessories 4

2.2. Optional Accessories 4

3. Specification 4

4. Installation 5

4.1. Quick 4-20 mA Start 6

4.2. Connect via WiFi/Bluetooth 6

4.3. Connect via USB 7

5. Probe Calibration with uPyxis Mobile App 7

5.1. Download uPyxis Mobile App 7

5.2. Connecting to uPyxis Mobile App 8

5.3. Diagnosis Screen 8

5.4. Calibration Screen and Reading 9

5.5. Device Info Screen 9

6. Probe Calibration with uPyxis Desktop App 10

6.1. Download uPyxis Desktop App 10

6.2. UnZip uPyxis Desktop App 11

6.3. Installing uPyxis Desktop App 12

6.4. Connecting to uPyxis Desktop App 13

6.5. Connecting to Device 14

6.6. Diagnosis Screen 15

6.7. Calibrating Device 15

6.8. Zero Calibration 16

6.9. Slope Calibration 16

6.10. 4-20 mA Span 17

7. Communicating using Modbus RTU 17

8. Probe Cleaning and Maintenance 17

8.1. Method to Clean ST-730 Series Probe 18

8.2. ST-730 Series Inline Probe Cleaning Solution 18

9. Other Common Troubleshooting Issues 19

10. Storage 19

2

1. Introduction

The Pyxis ST-730 series inline probe measures turbidity in water using a white LED as the excitation
light source and by measuring the scattered light at 90-degree angle with respect to the excitation
beam. The fluidic and optical arrangement of the ST-730 series probe is designed to overcome many
shortcomings associated with other inline turbidimeters. It can be easily inserted into the custom­made tee with a compression fitting port designed to ensure correct positioning of the ST-730 series
probe in the fluid stream. The ST-730 series probe custom mounting tee has two ¾ inch female NPT
ports for plumbing into an existing ¾ inch sample water line. The ST-730 series probe can be
connected to any device that accepts an isolated or non-isolated 4-20mA input. The ST-730 series
probe has a short fluidic channel that can be easily cleaned. Other features of the Pyxis ST-730 series
probe include:

• Menu-driven calibration procedure using a computer connected via USB or WiFi. Any
formazin turbidity standard in the range of 10 to 400 NTU can be used for the calibration.
The standard can be the water sample itself when the turbidity value of the sample has
been measured by another turbidimeter that has been calibrated. This allows the ST-730
series probe to be calibrated without being removed from the system.

• Diagnostic information (probe fouling, color or turbidity over range, failure modes) can be
communicated to digital displays via Modbus RTU.

• The ST-730 series probe can be easily removed from the custom tee for cleaning without the
need or any tools.

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 [e-mail]

3

2.1. Standard Accessories

Items

Specification

Power Supply Required

24 (±2) VDC @ 65 mA

Signal Output

4-20 mA and RS-485 Modbus RTU

Sample Water Temperature

40 – 104 °F (4 – 40 °C)

Ambient Temperature During
Operation

40 – 120 °F (4 – 49 °C)

Ambient temperature 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)

Turbidity Range

2 to 500 NTU (3σ error: ±2 NTU or 5% of reading, whichever is

greater)

Regulatory

CE Marked

• Tee Set (tee, O-ring, and nut)

• Bulkhead Cable

• Operation Manual

2.2. Optional Accessories

• USB-RS485 Adapter (Item Number: MA-485)

• Bluetooth Adapter (Item Number: MA-485B)

• Pyxis Graphic Panel (Item Number: DC-200)

• 1.5 inch OD O-ring (Item Number: MA-150)

• Extension cable – 50 feet (PN:50705)

• Extension cable – 100 feet (PN:5070)

3. Specification

4

4. Installation

It is recommended to install the ST-730 series probe tee in the pipe system where sample water
flow is upwards. Place the O-ring on the ST-730 series probe. Insert the ST-730 series probe into the
tee. Make sure that the fluidic channel in the ST-730 series probe is aligned with the sample flow
direction.

ST-730 with Tee Set

ST-730 with Dimensions

5

4.1. Quick 4-20 mA Start

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

Note: The negative 24V power terminal (power ground) and the negative 4-20 mA terminal on the
ST-730 series 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.

Follow the wiring table below to connect the ST-730 series probe to a controller.

4.2. Connecting via WiFi/Bluetooth

The connection between a computer and the ST-730 series probe vis WiFi/Bluetooth adapter (P/N:
MA-WB). A smart phone app is provided to connect the ST-730 series probe to your smart phone
via WiFi/Bluetooth interface.

6