Product Overview
The OHTS1095 Pyranometer is a precision instrument designed for measuring global solar radiation flux density. Based on the thermoelectric effect principle, this transmitter utilizes a wire-wound electroplated thermopile as the sensing element, featuring a high-absorptivity black coating that efficiently converts solar radiation into thermal energy.
The sensor incorporates a double-layer quartz glass dome with 95% light transmittance, specifically engineered to suppress air convection and minimize thermal radiation effects while blocking infrared interference. An integrated temperature compensation circuit ensures consistent measurement accuracy across extreme temperature variations. With its standard ModBus-RTU communication protocol and RS-485 output interface, the OHTS1095 enables seamless integration into remote monitoring systems and supports flexible parameter configuration for diverse application requirements.
Features
- Thermopile Sensing Element: Wire-wound electroplated thermopile with high measurement sensitivity and black coating for optimal radiation absorption
- Double-Layer Quartz Dome: 95% transmittance glass structure with specially treated surface to inhibit dust adhesion and minimize thermal interference
- Wide Spectral Coverage: Spectral response range of 0.3 μm ~ 3 μm captures the full solar radiation spectrum
- Temperature Compensation: Built-in circuit ensures ±3% accuracy across operating temperatures from -40 ℃ ~ +60 ℃
- Rapid Response: Fast 30-second response time (95%) for real-time monitoring applications
- Flexible Communication: Standard ModBus-RTU protocol with configurable device address (1 ~ 254) and baud rate (2400/4800/9600 bit/s)
- Durable Construction: Aluminum alloy housing designed for long-term outdoor deployment in harsh environmental conditions
- Diffuse Radiation Option: Compatible with shadow ring configuration for diffuse radiation measurement capabilities
Applications
The OHTS1095 Pyranometer is ideal for solar resource assessment and photovoltaic system efficiency monitoring, providing critical data for renewable energy project feasibility studies. It serves as a standard instrument for global solar radiation measurement at meteorological observation stations and climate research networks.
In agricultural applications, the sensor enables Photosynthetically Active Radiation (PAR) monitoring in agro-ecosystems and greenhouse environmental control systems. The device supports building thermal performance analysis, material aging tests, and durability evaluation for construction applications. Additionally, it is suitable for radiation budget studies in atmospheric pollution monitoring and scientific expeditions in polar or marine environments.
Technical Specifications
| Parameter | Specification |
|---|---|
| Supply Voltage | 10 V ~ 30 V DC |
| Output Interface | RS-485 (Standard ModBus-RTU Protocol) |
| Power Consumption | 0.2 W |
| Operating Temperature | -40 ℃ ~ +60 ℃ |
| Operating Humidity | 0 %RH ~ 95 %RH (Non-condensing) |
| Sensitivity | 7 ~ 14 μV·W⁻¹·m² |
| Internal Resistance | 200 Ω ~ 400 Ω |
| Response Time (95%) | ≤30 s |
| Non-linearity Error | ≤±3% |
| Directional Response Error | ≤±30 W/m² |
| Temperature Response Error | ≤±3% (-30 ℃ ~ +50 ℃) |
| Spectral Range | 0.3 μm ~ 3 μm |
| Measuring Range | 0 ~ 2000 W/m² |
| Resolution | 1 W/m² |
| Measurement Accuracy | ±3% |
| Annual Stability | ≤±3% |
| Cosine Response Error | ≤±5% |
| Tilt Response Error | ≤2% |
| Zero Drift | ≤6 W/m² |
Physical Specifications
| Parameter | Specification |
|---|---|
| Housing Material | Aluminum Alloy |
| Protective Structure | Double-layer Quartz Glass Dome |
| Mounting Method | Bracket Fixation (via bottom mounting holes) |
| Dome Transmittance | 95% |
FAQ
Q: What is the measurement principle of the OHTS1095 Pyranometer?
A: The OHTS1095 Pyranometer is designed based on the thermoelectric effect principle, utilizing a wire-wound electroplated thermopile as the sensing element. The sensing surface is coated with a high-absorptivity black coating that converts solar radiation into thermal energy and subsequently into a thermoelectric electromotive force through the radiation thermal effect.
Q: What are the requirements for the installation location?
A: Select an installation location with open surroundings free of obstructions, ensuring the sensing surface remains unshaded throughout the day. Avoid shadows from buildings, trees, or other obstructions. Ensure the mounting bracket is parallel to the horizontal plane using the leveling knob.
Q: How long should the sensor warm up before taking measurements?
A: Allow a 30-minute warm-up period after power-on. Measurements should only be taken after the sensor reaches thermal equilibrium to ensure accurate readings.
Q: How should the glass dome be maintained?
A: Regularly clean the glass dome using a soft cloth or chamois to maintain surface cleanliness. Strictly prevent water ingress into the glass dome. It is recommended to install protective covering during heavy rain, snow, or freezing conditions. Regularly check the desiccant status in the dryer and replace or dry immediately if it changes from blue to pink.
Q: What should be checked if the readings remain at zero?
A: If readings remain at 0, check whether the protective cover has been removed and confirm solar irradiance is present. Verify RS-485 wiring is correct with proper A and B polarity. Check that supply voltage meets the 10 V ~ 30 V DC requirement. If all checks are normal but communication is still impossible, hardware failure may be present.