1. Product Overview
The WITMOTION SINRT-232 is a high-precision dual-axis analog tilt switch designed for security inclinometer applications, offering 0.05° accuracy. It features a relay-output type and anti-vibration capabilities, making it suitable for building and bridge monitoring, as well as various industrial safety systems. This sensor provides reliable tilt angle alarm functionality with an IP67 protection rating.
Key Features:
- Dual-axis Inclination Measuring: X&Y Dual-axis (±90 degree) with Relay Value Output Type (200Hz Max output rate, normally open and normally closed optional).
- Robust Design: Utilizes a Cortex-M0 core processor, highly-integrated MEMS, and Kalman Algorithm for 0.1° accuracy (X, Y-axis) in dynamic environments.
- High Vibration Resistance: > 3500g.
- Wide Voltage Input: DC 9V ~ 36V.
- Wide Temperature Operation: -40°C to +85°C.
- IP67 Protection: Ensures durability in harsh conditions.
- UART RS232 Serial Port: For data communication.
Figure 1: WITMOTION SINRT-232 Relay-Output-Type Tilt Switch.
Figure 2: Overview of the SINRT-232's relay output and dual-axis monitoring capabilities.
Figure 3: Illustration of the advanced MEMS technology and Kalman filtering algorithm used for stable and accurate data output.
Figure 4: Visual representation of the four major features: IP67 waterproof rating, durable stainless steel aluminum shell, precision level beads for easy installation, and a superior shielded cable.
2. Setup Instructions
2.1 Package Contents
- 1 x WitMotion SINRT-232 Inclinometer (RS232 version)
- 1 x Evaluation Board
- 1 x Welcome Guide (USB-UART converter not included)
2.2 Hardware Connection
- Connect the SINRT-232 inclinometer to the provided evaluation board.
- Ensure the evaluation board's VCC is connected to a 9-36V power supply's VCC, and the evaluation board's GND is connected to the power supply's GND.
- Connect the evaluation board to your Windows PC using a Micro-USB cable.
2.3 Software Installation
- Install the necessary serial driver for the USB-UART converter. This driver is typically available on the WitMotion website.
- Confirm the COM port assigned to the device in your PC's Device Manager.
- Open the WitMotion PC software (Minimu.exe). Data should appear automatically after the auto-search function completes. If not, manually select the correct COM port and baud rate (default 9600bps).
Video 1: Instructions for connecting the SINRT-232 to a PC and using the software for data display and configuration.
3. Operating Instructions
3.1 Real-time Data Monitoring
Once connected to the PC software, the SINRT-232 will transmit real-time angle data (X, Y, Z axes). The software provides a dashboard, curve display, and data recording features for comprehensive analysis.
Figure 5: Screenshot of the WitMotion PC software displaying real-time attitude sensor data, including dashboard, curve display, configuration, and data record functions.
3.2 Setting Alarm Thresholds
The SINRT-232 allows users to set custom alarm angle thresholds. When the measured tilt angle exceeds the configured threshold, the relay output will trigger, which can be used to activate external alarm lights or other systems.
- In the PC software, navigate to the alarm settings.
- Enable the X and Y angle alarms.
- Set the minimum and maximum angle thresholds for both X and Y axes. The default alarm threshold is 10 degrees.
- Configure the confirmation time and hold time for the alarm trigger.
- Click 'Write' to save the configuration to the sensor.
Figure 6: Interface for setting custom alarm angle thresholds within the WitMotion PC software. This feature automatically warns operators in industrial environments.
Video 2: Demonstration of the SINRT tilt switch sensor triggering an alarm light when the tilt angle exceeds the set threshold.
Video 3: A comprehensive demonstration of the WitMotion SINRT high-precision dual-axis relay-output-type alarm tilt switch, showcasing its functionality and application.
4. Calibration
For optimal accuracy, the SINRT-232 may require calibration. The PC software provides tools for accelerometer calibration and setting the zero angle.
4.1 Accelerometer Calibration
- Place the module face-up on a horizontal plane before calibration.
- In the PC software, navigate to the 'Config' menu and select 'Acceleration' under 'Calibrate'.
- Click 'Start calibration'. The system will automatically calculate the calibration value. Wait for approximately 2-3 seconds, then click 'Complete calibration' after the data stabilizes.
- Click 'Write parameter' to save the calibration.
4.2 Reset Z-axis Angle
To reset the Z-axis angle to 0 degrees, ensure the sensor is in the desired orientation and use the 'Reset Z-axis Angle' function in the PC software.
Video 4: Detailed instructions on how to use the PC software for calibrating the SINRT-232 sensor and setting alarm conditions.
5. Maintenance
The SINRT-232 is designed for durability with an IP67 rating, offering protection against dust and water immersion. To ensure long-term performance:
- Keep the sensor clean and free from excessive debris.
- Avoid exposing the sensor to extreme physical shock beyond its specified resistance.
- Ensure all cable connections are secure to maintain the IP67 rating.
6. Troubleshooting
If you encounter issues with your SINRT-232, consider the following:
- No Data in Software: Verify the serial driver is correctly installed, the USB-UART converter is functioning, and the correct COM port and baud rate are selected in the software.
- Incorrect Readings: Perform accelerometer calibration as described in Section 4.1. Ensure the sensor is mounted securely and correctly oriented.
- Alarm Not Triggering: Check the alarm threshold settings in the software (Section 3.2) to ensure they are configured appropriately for your application. Verify the relay connections.
- Power Issues: Confirm the power supply is within the 9-36V DC range and correctly connected.
For further assistance, please refer to the support section.
7. Specifications
Figure 7: Detailed specifications for the SINRT-232 Tilt Switch, including model, brand, supply voltage, working current, interface, output, range, accuracy, return rate, baud rate, relay switch signal, operating temperature, mounting, and impact resistance.
| Parameter | Value |
|---|---|
| Model | SINRT-232 |
| Measuring Range | ±90 degrees (X, Y axis) |
| Measuring Axis | X, Y axis |
| Interface | UART RS232 Serial Port |
| Alarm Threshold | Configurable (default 10 degrees) |
| Accuracy | 0.1 degree (full range), 0.01 degree (resolution) |
| Vibration Resistance | > 3500g (10grms, 10~1000Hz) |
| Relay Output | Normally Open (default) |
| Supply Voltage | DC 9V ~ 36V |
| Operating Temperature | -40°C ~ +85°C |
| Protection Degree | IP67 |
| Frequency Response | 100 Hz |
| Long Term Stability | 0.1 |
| Power On Start Time | 0.5 seconds |
| Average Working Hours | ≥55000 hours |
| Cable Length | Standard 1.0 m, shielded |
| Weight | 55g |
8. Warranty and Support
The WITMOTION SINRT-232 inclinometer comes with a 12-month warranty and lifetime friendly customer service provided by the WitMotion team.
Support Resources:
- Online Tutorial: The tutorial link is printed on the guiding card included in the package.
- Website: Search for "wit-motion.com" to download complete tutorials, software, and documentation.
- Email Support: Contact support@wit-motion.com for any assistance.
