Feature: 1. The housing is made of high-quality material, not easy to be damaged, durable and has a long service life. 2. The input power supply, induction probe and signal output of the sensor are completely isolated, easy to use. 3. Adopt high sensitivity gas detection probe, ensuring stable signal and high accuracy, reliable to use. 4. It features wide measuring range, good linearity, easy installation, long transmission distance and so on. 5. This transmitter is widely used in agricultural greenhouse, flower cultivation and others that require CO2 and temperature and humidity monitoring. Specification: Condition: 100% Brand New Item Type: CO2 Transmitter Material: PVC Protection Level: IP65 Measuring Range: 400-5000PPm Power Supply: 10-30V DC (24V power supply for 0-10V type) CO2 Accuracy: ± (40ppm+3%F·S) (25℃) Stability: <2% F·S Non-linearity: <1% F·S Average Current: <85mA Data Update Time: 2s System Warm-up Time: 2min (Available), 10min (Maximum Accuracy) Temperature Effect: Comes with Temperature Compensation Working environment: 0~70℃, 0~95%RH (Non-condensing) Output Signal: 4-20mA, 0-5V, 0-10V (optional) Product Size: Approx. 11.7 x 11.3 x 4.2 cm / 4.6 x 4.4 x 1.7 in Weight: Approx. 177g / 6.2oz Wiring Method: Line Color Description Power Brown Power Supply Positive (10-30V DC) Black Power Supply Negative Output Blue CO2 Signal Positive Green CO2 Signal Negative Possible Causes of No Output or Output Errors: 1) PLC calculation error due to incorrect range measurement. 2) The wiring method is incorrect or the wiring sequence is wrong. 3) The power supply voltage is not correct (24V power supply for 0-10V type). 4) The distance between the transmitter and the collector is too long, causing signal disturbance. 5) The PLC acquisition port is damaged. 6) The equipment is damaged.. Package List: 1 x Sensor1 Bag x Accessories (2 x Screw, 2 x Nut) Note: 1. Please allow 0-2 cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.