Sper Scientific 970004-TB Turbidity Sensor Operation Manual

Chapter 1: Product Specifications

External Dimension Diagram: The diagram shows the sensor with specific measurements. The overall length is 253.7mm. The sensor body has a diameter of 60mm (indicated by $60). It features a connection point with two M6 threads (2xM6) and a cable with a connector. The diagram also indicates a length of 193.2mm for a specific section and a diameter of 35.8mm for the cable end.

Chapter 2: Product Overview

2.1 Product Information

The sensor, based on the infrared absorption scattered light method and combined with the application of ISO7027 method, can guarantee the continuous and accurate detection of turbidity. Based on ISO7027, infrared double scattering light technology will not be affected by chroma for the measurement of turbidity value. According to the usage environment, self-cleaning function can be equipped with. It assures the stability of data and reliability of performance; with the built-in self-diagnosis function, it can make sure the accurate data be delivered; besides, the installation and calibration is quite simple. The product is widely used in sewage plant, water plant, water station, surface water, farming, industry and other fields.

2.2 Safety Information

Please read this manual completely before opening the package, installing or using. Otherwise it may cause personal injury to the operator, or cause damage to equipment.

Warning Labels:

• When this symbol appears in the instrument, please refer to the operation or safety information in the reference manual.
• While this symbol indicates an electric shock or risk of death from electric shock.

Please read this manual completely. Pay particular attention to some notes or warnings, etc. To ensure that the protective measures provided by the equipment are not destroyed.

Chapter 3: Installation

3.1 Installation of Sensors

The specific installation steps are as follows:

1. Install the 8 (mounting plate) on the railing by the pool with 1 (M8 U-shape clamp) at the sensor mounting position;
2. Connect 9 (adapter) to 2 (DN32) PVC pipe by glue, pass the sensor cable through Pcv pipe until the sensor screws into 9 (adapter), and do waterproof treatment;
3. Fix 2 (DN32 tube) onto 8 (mounting plate) by 4 (DN42U-shape clamp).

Schematic Diagram on the Installation of Sensor: The diagram illustrates the physical setup for installing the sensor. It depicts railings (DN45-60, customer-provided), a DN32 stainless steel pipe (requiring thread processing), and a PVC connection. The numbered components are: 1-M8 U-shape Clamp (DN60), 2- DN32 Pipe (outside diameter 40mm), 3- Hexagon Socket Screw M6*120, 4-DN42U-shape Pipe Clip, 5- M8 Gasket (8*16*1), 6- M8 Gasket (8*24*2), 7- M8 Spring Shim, 8- Mounting Plate, and 9-Adaptor (Thread to Straight-through). A note indicates a PVC internal thread connection (401-1/4, PVC) and a connection to the sensor via the stainless steel pipe.

Chapter 4: Interface and Operation

4.1 User Interface

The sensor uses RS485 to USB for connecting to the computer, and then install the CD-ROM software Modbus Poll to the upper computer, double-click and execute the Mbpoll.exe to follow the prompts for installation, eventually, you can enter the user interface.

If it's the first time, you need to register first. Click "Connection" on the menu bar and select the first line in the drop-down menu. Connection Setup will display the dialog box for registration. Copy the attached registration code to the Registration Key and click "OK" to complete the registration.

Registration Dialog: A pop-up window titled "This is an unregistered copy" is shown. It contains a field labeled "Registration Key", buttons for "OK", "Order", and "Register later", and a help message "Press F1 for help".

4.2 Parameter Setting

1. Click "Setup" on the menu bar, select "Read / Write Definition", and then click "OK" according to the parameters shown below.

Read/Write Definition Dialog: This dialog allows configuration of MODBUS parameters like Slave ID (default 1), Function (e.g., 03 Read Holding Registers), Address (0), Quantity (22), Scan Rate (1000 ms), and View options. Notes indicate that Slave ID changes are saved for future connections.

2. Click "Connection" on the menu bar, select the first line in the drop-down menu "Connection setup", set it as shown below, and click "OK".

Connection Setup Dialog: This dialog configures the communication link. Options include selecting "Serial Port" or "TCP/IP", specifying the Port (e.g., "Port 7" for USB COM), Mode (RTU/ASCII), Baud Rate (e.g., 9600), Data Bits, Parity, Stop Bit, and timeouts. It also notes that "Port 7" represents the computer's COM port and provides troubleshooting advice for connection failures.

Chapter 5: Calibration of Sensor

The turbidity sensor has been calibrated at the factory, and can be calibrated according to the following procedures. It requires the use of turbidity standard solution to calibrate turbidity, and the specific steps are as follows:

If there is a large deviation between the measured value and the standard value, the slope of calibration curve needs factor correction.

1. Connect the sensor to the transmitter;
2. Set the relevant parameters and wipe the sensor;
3. Slowly immerse the sensor into the turbidity standard solution;
4. Wait for the value to be stable and record the stable value;
5. Calculate the correction factor. The correction factor equals to the standard solution value divided by the value measured in the fourth step. (Factor = standard solution value / stable value)
6. Enter the calculated correction factor in the corresponding register to complete the calibration.

Note: During the process of calibration, make sure the lens of probe is 15cm far from the bottom of calibration cup and no bubbles in front of the lens, meanwhile, it is recommended to keep the correction cup away from the light.

Chapter 6: Communication Protocol

The sensor is equipped with MODBUS RS485 communication function, please refer to this manual section 3.2 to check the communication wiring. The default baud rate is 9600, the specific MODBUS RTU table is shown in the following table.

MODBUS-RTU Parameters:

MODBUS-RTU Register Table:

Chapter 7: Maintenance

In order to obtain the best measurement results, it is very necessary to maintain the sensor regularly. Maintenance mainly includes cleaning, inspecting damage of the sensor, and periodic calibration. You can also view the sensor's status during maintenance and inspection.

7.1 Sensor Cleaning

Both the two lenses on the sensor need to be cleaned and maintained regularly to ensure the accuracy of the measurement on the basis of actual use. Wash with clean water, then wipe with a cleanser and rag to remove stubborn stains.

7.2 Inspection on the Damage of Sensor

Check the appearance of the sensor to see whether there is damage, if it's damaged, please contact to the after-sales service center in time for replacement to prevent malfunction of sensor caused by water due to the damage.

7.3 Sensor Blade Replacement

It is recommended that the blade of the sensor should be replaced quarterly with a new rubber one, the specific steps are as follows:

1. The position of the blade is shown on the left picture;
2. Remove the screws on the blade with the corresponding screwdriver;
3. Remove the blade, take out the rubber sheet inside, and replace it with a new one;
4. Finally put the blade back, and fasten the screw and blade with a screwdriver.

Sensor Blade Image: The image shows the lower part of the turbidity sensor, focusing on the replaceable blade. The blade is a small component attached to the sensor body, designed to be replaceable.