Autopilot CO2 Replacement Sensor w/15' Cable (for APC8200)

Restore Full CO2 Sensing Accuracy to Your Autopilot APC8200

The Autopilot APC8200 CO2 controller relies on its remote sensor probe to sample CO2 levels at canopy level in the grow room. Over time, NDIR sensors can drift or fail — resulting in inaccurate CO2 readings that lead to over- or under-enrichment.

This replacement probe uses a two-channel low-drift NDIR sensor to precisely read CO2 ppm levels, restoring the accuracy of the APC8200 without replacing the controller itself. The included 15-foot data cable and built-in photocell match the original factory probe specification.

Key Features & Benefits

• Two-channel low-drift NDIR sensor — dual-channel non-dispersive infrared sensing reduces measurement drift over time for consistently accurate CO2 ppm readings.
• Built-in photocell — detects ambient light levels and integrates with the APC8200 for light-dependent CO2 control functions.
• 15-foot data cable — provides 15 feet of reach from the APC8200 controller for remote canopy-level placement — extend further with the APC8210 extension cable.
• Direct replacement for APC8200 original probe — confirmed compatible replacement that matches the original factory sensor specification.
• Extends controller service life — replacing the sensor instead of the entire APC8200 controller is a cost-effective way to restore accurate CO2 measurement.

Who Should Use the Autopilot APC8200 CO2 Replacement Sensor

Growers using the Autopilot APC8200 CO2 Monitor and Controller whose remote sensor probe has drifted, failed, or been physically damaged — restoring accurate CO2 sensing without replacing the full controller.

Confirming Sensor Failure Before Replacing

Before replacing the probe, verify the issue is the sensor rather than the controller or cabling. Calibrate the APC8200 per the manual and check that the cable connections are secure. If readings remain inaccurate or erratic after calibration with good cable connections, sensor replacement is the appropriate next step.

About Autopilot

Autopilot has spent more than a decade building environmental control systems as a Hydrofarm exclusive brand, and its parts catalog includes direct-fit replacement components like this sensor. Stocking OEM replacement parts is part of how the brand keeps existing CO2 controllers in service rather than requiring a full unit replacement.

Frequently Asked Questions

How do I know if the APC8200 CO2 sensor needs replacement?

Signs include CO2 readings that are consistently out of range compared to a reference meter, erratic readings that don't respond to known CO2 changes, or a reading stuck at zero or maximum even when CO2 is clearly present. If these symptoms persist after calibration and a cable check, the sensor itself is the likely cause.

Is this sensor compatible with the APC8400?

No — the APC8400 uses an integrated internal sensor, not a remote probe. This replacement probe is designed specifically for the Autopilot APC8200.

Does the replacement sensor require calibration after installation?

Yes — after installing the replacement probe, calibrate the APC8200 per the controller's manual to establish the sensor's baseline. Skipping calibration can leave the controller reading CO2 levels inaccurately even though the new sensor itself is functioning correctly.

Can I extend the reach of this replacement probe?

Yes — the Autopilot APC8210 15-foot extension cable connects between the APC8200 and the probe to extend total reach to 30 feet from the controller. This is the same extension option used with the original factory probe, so it works identically with this replacement.