Description
1. Product Overview
2. Key Features
High-precision signal conditioning for gas sensors
Built-in automatic temperature compensation algorithm
Excellent linear correction, low zero drift
Multiple output modes: analog 4–20mA + RS485 Modbus-RTU
Industrial grade EMC anti-interference design
Miniature modular design, easy installation and embedded integration
Low power consumption, suitable for long-term continuous operation
Support one-key zero calibration and span calibration
Wide supply voltage range, convenient field wiring
3. Technical Specifications
3.1 Electrical Parameters
| Parameter | Specification |
|---|---|
| Model | DIM5-1 |
| Input Power | DC 12～24V |
| Working Current | ≤ 70mA |
| Input Signal | Weak current signal from electrochemical sensor |
| Measurement Range | Customizable 0–10ppm / 0–100ppm / 0–1000ppm |
| Accuracy | ±2% FS |
| Resolution | 0.01ppm |
| Warm-up Time | ≤ 5min |
| Analog Output | 4～20mA isolation output |
| Digital Interface | RS485, Modbus-RTU protocol |
| Baud Rate | 2400 / 4800 / 9600 / 19200 optional |
3.2 Environmental Parameters
| Parameter | Specification |
|---|---|
| Operating Temperature | 0℃ ~ +50℃ |
| Operating Humidity | 10%～95% RH, non-condensing |
| Storage Temperature | -20℃ ~ +60℃ |
| Working Pressure | 80kPa～120kPa |
| Protection Grade | IP40 |
3.3 Mechanical Parameters
| Parameter | Specification |
|---|---|
| Installation | Screw fixing / DIN rail mounting |
| Shell Material | High-strength engineering plastic |
| Weight | Approx. 40g |
| Outline | Compact rectangular modular size |
4. Application Scope
Matching use with AOP / CM / CRM series oxygen sensors
Industrial nitrogen, argon, hydrogen trace oxygen online monitoring
Semiconductor process gas detection and protection atmosphere monitoring
Laboratory glove box, inert gas cabinet atmosphere analysis
Portable gas detector and fixed online analyzer supporting module
Petrochemical, metallurgy, food and pharmaceutical residual oxygen monitoring system
5. Pin Definition & Wiring
Power Interface
VCC：DC 12～24V Positive
GND：Power Ground & Signal Common Ground
Sensor Interface
SEN+ / SEN-：Sensor signal differential input
Signal Output
4-20mA+ / 4-20mA-：Analog isolated output
A / B：RS485 communication line
6. Installation & Operation Guide
6.1 Installation
Install horizontally, avoid direct sunlight and heat radiation.
Keep away from high-power frequency conversion equipment and strong electromagnetic interference sources.
Sensor signal wire adopts shielded wire, separated from power line layout.
Ensure reliable grounding to improve anti-interference performance.
6.2 Calibration Steps
Power on the module and preheat for at least 5 minutes.
Zero Calibration：Feed high-purity nitrogen (0ppm) to complete zero point calibration.
Span Calibration：Access standard gas with known concentration for span calibration.
The module automatically saves calibration parameters and enters normal measurement state.
7. Safety Precautions
Do not apply overvoltage power supply to prevent module permanent damage.
Prohibit use in flammable, explosive and strong corrosive environments without protection.
Do not disassemble the shell privately; unauthorized disassembly will void warranty.
Prevent liquid, dust and oil from entering the wiring port and shell.
In thunderstorm weather, strengthen grounding and lightning protection measures.
8. Daily Maintenance
Check wiring terminals regularly every 3 months for looseness and oxidation.
Recalibrate every 3–6 months according to working environment.
Keep module surface clean and dry, avoid dust accumulation.
For long-term shutdown, cut off power supply and store in dry and ventilated place.
9. Troubleshooting
| Fault Phenomenon | Possible Cause | Solution |
|---|---|---|
| No power and no response | Abnormal power input / wiring error | Check DC power supply and wiring polarity |
| Large reading drift | Insufficient warm-up / sensor aging | Fully preheat; recalibrate or replace sensor |
| No 4–20mA output | Output wiring error / channel fault | Check analog output connection |
| RS485 communication failure | A/B line reversed / address conflict | Swap A and B line; modify device address |
| Unstable fluctuation value | Electromagnetic interference / poor grounding | Use shielded wire and reliable grounding |
10. Warranty & Disclaimer
Product Model：DIM5-1 Signal Conversion Module
Warranty Period：12 months from delivery date under normal installation and use
The warranty does not cover damage caused by wrong wiring, overvoltage, unauthorized disassembly and man-made damage.
All specifications are subject to change without prior notice. The manufacturer reserves the right to optimize product structure and performance
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