Product Overview
The OHTS1124 is a negative oxygen ion concentration monitoring instrument based on the capacitive aspiration principle, designed for ambient air quality monitoring and assessment. The device integrates a high-sensitivity negative ion detection unit, featuring local LCD data display and remote digital communication capabilities.
The device supports data exchange with host computer systems or PLCs via the RS485 interface using the ModBus-RTU protocol, with a maximum communication distance of up to 2000m. It supports wide-voltage DC power supply and is applicable for forestry, meteorological, environmental protection, and indoor air quality monitoring scenarios, capable of long-term stable operation in outdoor environments.
Features
- Utilizes high-precision negative oxygen ion measurement unit with excellent long-term stability and favorable time-drift characteristics
- Measurement range 0 ~ 5,000,000 ions/cm³, resolution 10 ions/cm³, typical accuracy ±15%
- Equipped with large-size LCD display, supporting local real-time data reading and parameter viewing
- Standard RS485 digital interface with ModBus-RTU communication protocol, supporting software configuration of address and baud rate
- Wide-voltage power supply design, supporting DC 10 ~ 30V input range
- Front panel configured with buttons, supporting local parameter setting and calibration operations
- Ion mobility 0.4 cm²/(V·s), mobility error ±5%
- Industrial-grade temperature and humidity adaptability, operating temperature range -40℃ ~ +70℃
Applications
The OHTS1124 is suitable for diverse environmental monitoring applications including:
- Forestry ecological monitoring and forest environmental quality assessment
- Urban ambient air quality monitoring networks
- Atmospheric ion concentration monitoring at meteorological observatories
- Real-time air quality monitoring in tourist attractions
- Ecological environment monitoring in nature reserves
- Indoor air quality detection and assessment
- Environmental scientific research and data acquisition
- Smart agriculture greenhouse environment monitoring
Technical Specifications
| Parameter | Specification |
|---|---|
| Supply Voltage | DC 10 ~ 30V |
| Maximum Power Consumption | 2W (under DC 12V supply condition) |
| Measurement Range | 0 ~ 5,000,000 ions/cm³ |
| Resolution | 10 ions/cm³ |
| Measurement Accuracy | ±15% |
| Data Update Rate | 1Hz |
| Ion Mobility | 0.4 cm²/(V·s) |
| Ion Mobility Error | ±5% |
| Communication Interface | RS485 |
| Communication Protocol | ModBus-RTU |
| Default Baud Rate | 4800 bit/s (optional 2400/9600 bit/s) |
| Default Device Address | 0x01 (range 1 ~ 255) |
| Maximum Communication Distance | 2000m |
| Operating Temperature | -40℃ ~ +70℃ |
| Operating Humidity | 0%RH ~ 95%RH (non-condensing) |
Physical Specifications
| Parameter | Specification |
|---|---|
| Mounting Method | Wall-mounted screw fixation |
| Mounting Orientation | Must be placed vertically |
| Recommended Mounting Height | 1.5m (geometric center of device from ground) |
| Grounding Requirement | Enclosure must be properly grounded, grounding resistance <4Ω |
FAQ
Q: What is the measurement principle of the OHTS1124?
A: The OHTS1124 utilizes the capacitive aspiration principle for negative oxygen ion concentration monitoring, featuring ion mobility of 0.4 cm²/(V·s) with ±5% mobility error.
Q: What is the communication protocol and maximum distance?
A: The device supports RS485 interface with ModBus-RTU protocol, with configurable baud rates of 2400, 4800, or 9600 bit per second, and maximum communication distance of up to 2000 meters.
Q: What are the power supply requirements?
A: The device supports wide-voltage DC power supply with input range of DC 10V to 30V, with maximum power consumption of 2W under DC 12V supply condition.
Q: Why must the device be installed vertically?
A: The device must be installed strictly vertically because any tilt will affect the accuracy of measurement data due to the capacitive aspiration measurement principle and air flow dynamics.
Q: How to calculate the negative oxygen ion concentration from ModBus registers?
A: The concentration is calculated using the formula C equals D high multiplied by 65536 plus D low, where D high is the value from register 0000H and D low is from register 0001H, resulting in the final value in ions per cubic centimeter.