Product Overview
The OHTS1122 is a digital snow depth measurement sensor based on the phase-shift laser ranging principle, utilizing a 635nm semiconductor laser source and integrating a temperature compensation algorithm to eliminate the influence of laser temperature drift on measurement accuracy. The device features automatic tilt detection, supports data communication via RS485 interface using Modbus-RTU protocol, and can output snow depth data with 1mm resolution and ±1mm accuracy.
The device is equipped with an automatic heating module that activates when ambient temperature falls below the set threshold, ensuring measurement stability in low-temperature environments. The enclosure features IP65 protection rating, suitable for long-term outdoor operation.
Features
- Phase-shift laser ranging technology with 1mm measurement resolution and ±1mm accuracy
- Integrated automatic tilt measurement function; no additional angle calibration required during installation
- Built-in temperature compensation circuit ensuring measurement stability within -40°C ~ +50°C range
- Automatic heating function that activates in low-temperature environments to maintain optical window cleanliness and measurement performance
- IP65 protection rating, adaptable to harsh outdoor climatic conditions
- Supports Modbus-RTU communication protocol with default baud rate of 4800 bit/s
- Laser source wavelength 635nm, output power < 1mW, safety Class II
Applications
- Automatic weather station snow depth observation
- Road traffic safety snow accumulation monitoring
- Aircraft takeoff and landing snow monitoring
- Agricultural production snow cover monitoring
- Real-time snowfall monitoring networks
- Hydrometeorological observation stations
- Winter sports venue snow monitoring
- Power facility snow thickness monitoring
Technical Specifications
| Parameter | Specification |
|---|---|
| Supply Voltage | DC 10V ~ 30V |
| Static Power Consumption | ≤ 0.8W |
| Heating Power Consumption | ≤ 3.5W |
| Operating Temperature | -40°C ~ +50°C |
| Operating Humidity | 0%RH ~ 95%RH (non-condensing) |
| Measuring Range | 0.05m ~ 2.5m |
| Resolution | 1mm |
| Measurement Accuracy | ± 1mm |
| Laser Wavelength | 635nm |
| Laser Power | < 1mW |
| Laser Safety Class | Class II |
| Single Measurement Time | 0.05s ~ 1s |
| Spot Size (Point Spot) | 5mm @ 10m |
| Spot Size (Line Spot) | 3mm × 150mm @ 10m |
| Communication Interface | RS485 |
| Communication Protocol | Modbus-RTU |
| Data Format | 8 data bits, no parity, 1 stop bit |
| Default Baud Rate | 4800 bit/s |
| Configurable Baud Rates | 1200 bit/s, 2400 bit/s, 4800 bit/s, 9600 bit/s, 19200 bit/s, 38400 bit/s, 57600 bit/s, 115200 bit/s |
| Protection Rating | IP65 |
| Device Address Range | 1 ~ 254 (factory default: 1) |
Physical Specifications
| Item | Specification |
|---|---|
| Mounting Method | Bracket fixed installation |
| Installation Angle | 45° ~ 60° angle with horizontal plane |
| Recommended Installation Height | 2.5m ~ 3.0m |
FAQ
Q: Can this device be used as a safety or emergency stop device?
A: No, this device is strictly prohibited from being used as a safety device or emergency stop device, nor shall it be used for other purposes that may cause personal injury due to device failure.
Q: What should be done if the device is moved after zero calibration?
A: Ensure the device is not moved after zero calibration to prevent data anomalies. If the device must be moved, recalibration is required.
Q: What conditions can affect measurement accuracy?
A: Under adverse measurement conditions such as excessive ambient light intensity, ambient temperature too high or too low, target reflection too weak or too strong, or target surface rough and uneven, reduced measuring range or increased measurement error may occur.
Q: How to make device address or baud rate settings take effect?
A: After modifying device address or baud rate, power cycle the device to make settings take effect.
Q: What is covered by the warranty?
A: The warranty period is 12 months from the date of purchase. During the warranty period, if problems with the device’s mechanical parts, materials, or workmanship occur under normal use and maintenance conditions, free repair and parts replacement service will be provided upon verification.