Carbon Dioxide
Monitor Controller
Installation and
Operation Manual
CDMC-6
P.O. Box 1318 Gresham Or. 97030 USA
1-800-669-2113 Fax 1-503-663-1147
info@greenair.com www.greenair.com
Operatingprinciple Non-dispersiveinfrared(NDIR)
Gas sampling method Diffusion or sample draw
Measurementrange 0 - 5000 ppm CO2
Typical drift (per year) ±75 ppm (@ 1200ppm)
Accuracy ±5% of reading or ±75 ppm
Repeatability ±20 ppm
Calibration Interval Five Years
Response time Less than 1 minute
Operatingtemperature 0 to 50 ° C
Operating humidity 0 - 90% RH (non condensing)
Storagetemperature -30 to + 60 ° C
Powerrequirements 20 - 28 VRMS AC, 18 - 30 VDC
Powerconsumption Less than 2W @ 24 VAC
Voltage output (linear) 0 - 10 volts DC standard
Currentoutput (linear) 4 - 20 mA (RL< 500 ohm)
Warm-up time 3 minutes
Dimensions 5.2" x 3.2" x 1.4"
Weight 6.5 Oz. (.35 Kg)
Digital Display 4 digit, .35" LCD
Operating life expectancy 10 years typical
Warranty 90 day, parts and labor
Specifications
TheCDM-6000 isfactory calibratedfor operationatsea level. Whenoperated
at higher elevations, the calibration may be adjusted to correct for this factor.
The CDDS-2 can be set to the exact operating elevation to eliminate the
measurement error caused by decreased barometric pressure at higher
altitudes. This altitude compensation is done by the CDDS-2 controller. Let
the CDM-6000 stabilize to the ambient CO2 concentration. To change the
operating elevation:
1. Press and hold both the ‘SET’ and ‘SENSOR’ buttons for about five (5)
seconds until all the yellow LED's blink. The current elevation setting is
displayed.
2. Use the ‘UP’ and ‘DOWN’ buttons to adjust the display reading to the
current elevation in feet. The display moves in 10 foot increments.
3. After several seconds of no button activity the CDDS-2 reverts to its normal
operating mode.
Altitude Correction
Feature Identification
The SENSOR button toggles between
photo sensor “on” and “off” modes. If
the
activated
LED is lite the controller
will operate only when light is present.
This is the normal setting for CO2
enrichment. This mode will defeat
enrichment during darkness periods.
When the
activated
LED is off the
controller will operate continuously
regardless of the photoperiod.
The MODE button switches between CO2 enrichment or CO2 venting
functions.
Enrichment
is the normal mode for CO2 enrichment operations.
Venting
mode is for purposes of removing excessive levels of CO2. This is
used primarily for mushroom cultivation or HVAC control where CO2 is to be
removed from the area.
The SET button allows you to choose an enrichment level
setpoint
and
hysteresis
value.The hysteresisis the valuebetween "On"and"Off"functions.
This value determines at what point the CO2 equipment will turn "Off". In the
example below a 50 ppm hysteresis setting will turn CO2 "Off" at 1050 ppm.
Example : Set point = 1000 ppm Hysteresis = 50
In the example if the CO2 level falls below the setpoint (1000 ppm) the CO2
equipment outlet will come "On" and enrichment will continue until a level of
1050 is reached and then it will shut off.
To make setpoint adjustments press SET and the LED will flash the current
setpoint value. Press the UP or DOWN buttons to achieve any desired value.
Press SET again to enter your hysteresis. The system will return to operation
mode automatically after five seconds and continuously display the current
CO2 level.
TheCDDS-2 CarbonDioxideDigital Sequencerfeatures Overshoot Protection
Logic programming which will automatically maintain the proper dosing
parameters necessary to keep any size area enriched within a set tolerance
regardless of the particular characteristics of the enclosure. If on the initial
cycle the controller senses that excess CO2 has been administered it will
automaticallycompensate forthe nextdosage.This willassure thattheproper
levels are constant and maintained at all times with complete accuracy.
Model 6000
Features
Description
Introduction
The model CDM-6000 is a non-dispersive infrared analyzer for measuring
atmospheric CO2 concentration in plant zone environments. The CDM-6000
has a measurement range from 0 - 5000 ppm (0 to 0.5%)
The CDM-6000 provides a voltage of 0 - 5 volt output as standard. A simple
one-point calibration procedure and a built-in calibration port that requires no
special fittings or adapters make the CDM-6000 simple to maintain. For
information about advanced settings and features of this product, hardwiring
to the terminal block external connections or using this sensor with a device
other than the CDDS-2 controller, or for complete instructions manual please
refer to www.greenair.com/cdmc.htm.
The CDDS-2 has a sophisticated adaptive algorithm microprocessor. This
“Overshoot Protection Logic” algorithm “learns” the dynamics of the space
being controlled to avoid the dramatic overshoots inherent to setpoint control.
These learned control parameters are remembered even when the CDDS-2
is powered off.
This booklet will discuss the features and functions of the Green Air Products
Infrared Carbon Dioxide Monitor and Digital Event Sequencer system. This
system is designed to detect atmospheric CO2 levels and function CO2
producing equipment according to user programmable set points. It employs
the most advanced detection system providing precise, accurate and
dependable performance.
This carbon dioxide monitor controller model CDMC-6 package includes the
CDM-6000 CO2 monitor with LCD display and a CDDS-2 digital sequencer
with event programmer and photo sensor. The monitor samples atmosphere
once each second and displays current CO2 values in parts per million (ppm)
on it's display screen, while transmitting linear millivolt signals to the Digital
EventSequencer logictranslatingcircuits. Thesequencertheninterprets these
signals and functions the CO2 equipment outlet according to predetermined
values. The built in photo sensor automatically defeats the CO2 equipment
outlet during darkness periods.
