Product Overview
The OHTS1091 is a high-precision photoelectric effect illuminance detection transmitter designed for professional lighting measurement applications. The device provides measurement units in Lux and features a robust aluminum alloy enclosure with IP65 protection rating, making it ideal for outdoor installations and harsh industrial environments where reliability and durability are critical.
The transmitter integrates an RS485 communication interface supporting standard ModBus-RTU protocol, offering configurable communication addresses and baud rates to accommodate various industrial network configurations. With a maximum communication distance of 2000 meters, the device can be deployed in large-scale agricultural facilities or distributed industrial monitoring systems. Operating on a 7 ~ 30V DC wide voltage power supply, the OHTS1091 features dual selectable measurement ranges (0 ~ 65535Lux or 0 ~ 200000Lux), making it versatile for applications ranging from sensitive greenhouse environments to high-intensity outdoor lighting monitoring.
Features
Dual Range Configuration: The transmitter offers selectable measurement ranges of 0 ~ 65535Lux or 0 ~ 200000Lux, allowing users to optimize measurement resolution based on specific application requirements, from low-light indoor environments to direct sunlight monitoring.
High Precision Detection: Available in two accuracy classes - standard type with ±7% accuracy at 25 ℃ and high-precision type with ±4% accuracy at 25 ℃ - ensuring reliable data for both general monitoring and precision research applications.
ModBus-RTU Communication: Standard RS485 interface with ModBus-RTU protocol support and configurable baud rates from 1200 to 115200 bit / s (default 4800 bit / s), enabling seamless integration with existing industrial control systems and data loggers.
Rugged Industrial Design: Aluminum alloy enclosure with IP65 protection rating provides superior resistance to dust ingress and water jets, while the built-in spirit level facilitates precise horizontal mounting for accurate measurements.
Flexible Power Options: Wide voltage power supply range of 7 ~ 30V DC with maximum power consumption of only 0.4W, supporting various installation scenarios including remote locations with solar power systems.
Long-term Stability: Excellent long-term stability of less than or equal to 5% per year reduces maintenance requirements and ensures consistent measurement performance over the device lifetime.
Rapid Response: Fast response time of less than 1 second enables real-time monitoring and control applications such as automated greenhouse shading or intelligent building lighting systems.
Professional Mounting System: Wall-mounted screw fixation with hand-tightened adjustment mechanism and integrated spirit level ensures proper sensor orientation for optimal measurement accuracy.
Applications
The OHTS1091 illuminance transmitter is specifically designed for comprehensive lighting environment monitoring across multiple industries. In agricultural applications, it enables precise photoperiod management in floriculture greenhouses, continuous illumination monitoring in open agricultural fields, and lighting optimization in livestock breeding environments. The device’s IP65 rating makes it suitable for long-term deployment in outdoor meteorological stations for climate research and weather monitoring.
For industrial applications, the transmitter supports lighting quality inspection in electronic equipment production lines, illumination monitoring in warehousing and logistics environments, and light intensity detection in harsh industrial site conditions. In the smart building sector, the device facilitates automated lighting control systems that optimize energy consumption while maintaining appropriate illumination levels for occupant comfort and productivity.
Technical Specifications
| Parameter | Specification |
|---|---|
| Supply Voltage | 7 ~ 30V DC |
| Maximum Power Consumption | 0.4W |
| Measurement Range | 0 ~ 65535Lux or 0 ~ 200000Lux |
| Accuracy (Standard Type) | ±7% ( @ 25 ℃ ) |
| Accuracy (High-Precision Type) | ±4% ( @ 25 ℃ ) |
| Long-term Stability | ≤5% / y |
| Response Time | <1s |
| Output Signal | RS485 (ModBus-RTU) |
| Communication Distance | ≤2000m |
| Baud Rate | 1200 / 2400 / 4800 / 9600 / 19200 / 38400 / 57600 / 115200 bit / s |
| Data Format | 8 data bits, no parity, 1 stop bit |
| Error Checking | CRC-16 |
| Protection Rating | IP65 |
Physical Specifications
| Parameter | Specification |
|---|---|
| Enclosure Material | Aluminum Alloy |
| Protection Rating | IP65 |
| Mounting Method | Wall-mounted (screw fixation) |
| Leveling Adjustment | Built-in spirit level, supporting hand-tightened screw adjustment |
| Electrical Connection | 4-wire system (Power +, Power -, 485-A, 485-B) |
FAQ
Q: What are the selectable measurement ranges for this transmitter?
A: The device supports dual range configuration with selectable ranges of 0 ~ 65535Lux or 0 ~ 200000Lux to accommodate different lighting intensity requirements.
Q: What communication protocol and distance does this device support?
A: The transmitter uses standard ModBus-RTU protocol over RS485 interface with configurable baud rates from 1200 to 115200 bit per second and supports maximum communication distance of 2000 meters.
Q: How should I install the device to ensure accurate measurements?
A: Mount the device using wall-mounted screw fixation, then adjust the hand-tightened screws while observing the built-in spirit level to ensure the sensor surface is parallel to the ground. After installation, remove the protective cover on top of the sensor.
Q: What are the power supply requirements and safety precautions?
A: The device requires 7 ~ 30V DC power supply with maximum power consumption of 0.4W. Strictly prohibited from connecting to AC power or DC voltage beyond the specified range. Always confirm power is disconnected before wiring to avoid live operation.
Q: What is the protection rating and environmental suitability?
A: The device features IP65 protection rating with aluminum alloy enclosure, making it suitable for outdoor meteorological stations, agricultural greenhouses, and harsh industrial site environments. Ensure the enclosure is properly sealed during outdoor installation to maintain IP65 rating.