Growlink ESM2 Climate Sensor w/CO2

Growlink ESM-2 Climate Sensor for CO2, Humidity, Temperature, and Pressure The ESM-2 is a modular 4-in-1 probe that reads CO2, humidity, temperature, and pressure on one hardwired RS485 daisy chain. Power runs on 15-30 VDC from the Growlink control panel. The sensing module unscrews from the body for swap-out at calibration intervals. Each unit ships with a unique MAC address printed on the box. The chain map matches a known room and chain position from the start. Climate Sensor Built for Canopy-Level Grow Room Monitoring The ESM-2 sits at or slightly above canopy height to read the air the plants actually breathe. CO2 measuring ranges run 0-2000, 0-5000, or 0-10000 ppm with ±50 ppm + 2% accuracy on the 2000 ppm range. Humidity tracks 0-95% RH non-condensing with ±3% accuracy across 20-80% RH at 25°C. A 120Ω terminating resistor at the last junction box keeps the RS485 daisy chain stable in noisy grow environments. Key Features 4-in-1 Probe: Measures CO2, humidity, temperature, and pressure from a single sensor body at canopy height. RS485 Daisy Chain: Hardwired daisy chain reduces interference and dropouts vs. wireless mesh sensors in dense grow rooms. 15-30 VDC Power: Runs on the Growlink control panel's existing 14 AWG plus/minus conductor pair. Replaceable Sensing Module: The sense element unscrews from the body for calibration swap-outs without pulling the whole unit. Selectable CO2 Range: Configure 0-2000, 0-5000, or 0-10000 ppm depending on whether the room is ambient or CO2-enriched. Technical Specifications Specification Value Measurements CO2, humidity, temperature, pressure CO2 Ranges 0-2000 ppm / 0-5000 ppm / 0-10000 ppm CO2 Accuracy ±50 ppm + 2% of measured value (0-2000 ppm range) Humidity Range 0 - 95% RH (non-condensing) Humidity Accuracy ±3% RH at 25°C, 20-80% RH Power Input 15-30 VDC Power Wiring 14 AWG +/- conductors from Growlink control panel Communication RS485 daisy chain Cable Type Twisted shielded pair, 100-130Ω impedance Chain Termination 120Ω resistor at last junction box Sensing Module Replaceable (unscrews from body) Identification Unique MAC address printed on each unit Compatible Controllers Growlink environmental control panels