CO2 Controller Operating Instructions
Models: RAD-0501, RAD-0501A
© CO2Meter, Inc. Rev. 7/12/17 and S/N: E7044002386 or higher
1. Product Description
RAD-0501 Greenhouse Mode: Controls CO2 generator or regulator to
increase CO2 levels during daylight for plant growth.
RAD-0501A Ventilation Mode: Controls an exhaust fan when CO2 levels are
higher than recommended maximum for your application.
Main Features (Both Models):
1. Accurately measures CO2 concentrations up to 2,000ppm
2. Built-in temperature (°C or °F) measurement
3. Automatic altitude compensation via built-in barometric sensor
4. Relay-controlled outlet regulated by long-lasting CO2 sensor.
2. Contents & Description
1. CO2 Controller
2. Wall panel holder (1)
3. Screws (2)
4. Drywall anchors (2)
5. User Manual
A. LCD Display
B. Photo Sensor (monitors light or dark period)
C. Power - Red LED (power on indicator)
D. Active - Green LED (lights when relay is active)
E. CO2 High - Red LED (lights when CO2 concentration is above Target Hi)
F. Daylight - Yellow LED (verifies photo sensor is working properly)
G. DOWN Button (changes menu settings)
H. UP Button (changes menu settings)
I. SEL/ENT Button (selects menu settings)
J. Unit power and relay-controlled power “piggyback” plug
K. Case screw mounts
L. CO2 sensor
M. Tube fitting for bottled gas calibration
N. 4-20mA Linear Analog Output for CO2 level
3. Caring for the Product
To get the most out of this product, please observe the following
1. Repair - Do not attempt to repair the product or modify the circuitry by
yourself. Contact CO2Meter.com if the product needs servicing, including
the replacement or calibration of the sensor.
2. Cleaning - Disconnect the power before cleaning. Use a damp cloth. Do
not use liquid cleaning agents such as benzene, thinner or aerosols, as
these will damage the device.
4. Connection Diagram
Note: In Greenhouse Mode the piggyback plug controls CO2 regulator or generator. In
Ventilation Mode the piggyback plug controls an exhaust fan.
4.1. How it Works
1. The Power (Red LED) is on when the power is supplied.
2. Greenhouse Mode: The DayLight (yellow) LED will light when the photo
sensor is active. The photo sensor detects the presence or absence of light.
When light is present, and CO2 levels are between the Target Lo and
Target Hi CO2 levels, the Active (green) LED is on and power will be
supplied to the piggyback plug. When CO2 levels reach the Target Hi level,
the Active (green) LED will turn off, the CO2 High (red) LED will turn on,
and power will be cut to the piggyback plug. In darkness, the piggyback
plug is not powered regardless of the CO2 level.
3. Ventilation Mode: If CO2 levels are higher than the Target Hi level, the
Active (green) LED will turn on and power will be supplied to the piggyback
plug. When CO2 levels decrease below the Target Lo, the Active (green)
LED will go off and power will be cut to the piggyback plug. In ventilation
mode, the photo sensor is always disabled.
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