LD-PECO3100 CO Gas Detector Unit

Module Feature

LD-PECO3100 is industrial carbon monoxide gas detection transmitter. It adopts high stability electrochemical sensing chip, fast response speed and good anti-interference performance.

It supports real-time concentration display, adjustable alarm threshold, with sound, light and vibration triple alarm function. It can output 4-20mA analog signal and RS485 Modbus RTU digital signal, conveniently connected to PLC, DCS and gas alarm controller. Explosion-proof optional version is available for hazardous area. Widely used in metallurgy, boiler workshop, tunnel and confined space operation protection.

Working principle

Carbon monoxide gas diffuses into the electrochemical sensor, redox reaction occurs inside the sensor and generates weak current signal proportional to gas concentration.

The main board samples and converts the signal, calculates CO concentration value. When concentration exceeds preset alarm value, the alarm module triggers prompt. Measurement data is transmitted to upper control system through signal circuit.

Onboard components

Electrochemical CO sensor, signal sampling circuit, LCD display screen, buzzer alarm module, LED warning lamp, vibration motor, power management circuit, terminal block.

LED indicators

Front LEDs indicate power supply, normal measurement, pre-alarm and high concentration alarm status.

Hardware self‑diagnosis

Self-check covers sensor failure, circuit abnormality, power undervoltage and signal out-of-range. Fault information will be displayed on local screen and uploaded by communication.

Programming software

Support host configuration software for range setting, alarm threshold adjustment, zero calibration and parameter backup.

Electrical & Process Parameters

Model:LD-PECO3100 Brand:LD Instruments Device type:CO Gas Transmitter Detection principle:Electrochemical Range:0~1000ppm Supply voltage:24V DC Output:4~20mA, RS485 Modbus RTU Function:On-line carbon monoxide gas concentration monitoring and leakage alarm

Mechanical & Structure

Mounting:Wall mounting Protection class:IP65 Housing:Cast aluminum alloy shell

Environmental

Operating temperature:-20℃ ~ +50℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:10~95% non‑condensing Certification:CE, ATEX optional Status:LD Instruments original gas detector spare

Installation

Install detector on wall at suitable height according to CO gas characteristic. Keep air circulation at sampling position, avoid strong air flow and corrosive gas impact.

Connect 24V DC power and signal wiring correctly. Complete zero calibration after installation. Regularly calibrate sensor according to maintenance cycle.

Interface

24V DC power terminals, 4-20mA signal terminals, RS485 communication terminals, alarm relay contacts.

Diagnostic

Concentration reading zero and no response: Sensor failure, sampling channel blocked.

False alarm: Sensor aging, cross interference gas.

No communication: Wiring reverse, bus address conflict.

Product BriefLD-PECO3100 CO gas transmitter, electrochemical carbon monoxide sensor, 4-20mA and RS485 output, sound light alarm, used for industrial CO leakage safety monitoring.