PPM-1c / Part Per Million CO
2
Monitor
The PPM-1c allows users to upgrade C.A.P.’s line of CO
2
& Environmental controllers to control
CO
2
with PPM / “Part Per Million” accuracy. The PPM-1c is capable of measuring CO
2
PPM
levels from 0-5000. On-board adjustable set point and calibration makes it easy to use.
•
The PPM-1c is an extremely accurate Part-Per-Million (PPM) CO
2
sensor.
•
It can measure CO
2
from 0-5000 PPM +/- 100PPM.
•
It has an easy to read 4-digit LCD display.
•
It has an external power supply and a Quick Disconnect or “QD”, which is connected
to a CO
2
-2, CO
2
-4 Environmental controller or the CGC-1 Complete Greenhouse
Controller.
•
Once the PPM-1c is connected to either the CO
2
-2, CO
2
-4 or the CGC-1, the
controller will receive information from the PPM-1c and use it to control the CO
2
levels with extreme precision.
•
The PPM-1c works in harmony with the Inject and Sample timers on the CO
2
-2 ,
CO
2
-4 or the CGC-1.
•
The PPM-1c also has a visual Status indicator, which verifies the unit has completed
the “Initial warm-up” stage and is functioning properly.
INSTALLATION
1) The base-plate must be mounted to a wall using the (4) screws provided with the unit. Find a location near a 120-volt
receptacle for power. The PPM-1c will need to have a fair amount of airflow around the enclosure and be at “plant-level”
to be most accurate.
2) Once the base-plate is mounted the sensor can be snapped onto the base-plate by hooking the two top tabs and then
pivoting the unit down until it snaps into place.
*Note: To release the tabs, press in on the two snap tabs located on the bottom of the unit near each edge.
3) The PPM-1c comes pre-wired with a plug-in power supply. The power supply must be connected to a constant source of
120-vac power. Once powered up, the PPM-1c will enter a “Initial warm-up” and calibration mode. Slowly over a 10-20
minute period, the CO
2
level should stabilize between 250-550 PPM outdoors and as much as 1500 PPM indoors.
CONNECTING TO THE ENVIRONMENTAL CONTROLLER
The other cable coming from the PPM-1c is the Quick disconnect or “QD”. The QD is a standard IEC cable which replaces
the jumper plugged into the connector on the left side of the CO
2
-2 / CO
2
-4 and the bottom of the CGC-1. Once the PPM-1c
is connected, the controller will automatically begin controlling CO
2
with Part-Per-Million accuracy.
MAKING ADJUSTMENTS
The PPM-1c has an adjustable setpoint from 0-5000 PPM. Once the desired setpoint is entered, the PPM-1c will disable the
“CO
2
Level Low” function of the environmental controller effectively shutting OFF the CO
2
outlet. Adjusting the CO
2
setpoint and re-calibrating the unit is easy using the front mounted push buttons. There are four buttons.
a)
clear
: used with the mode button to enter the programming mode.
b)
mode:
used with the clear button to enter the programming mode and to scroll through the different modes.
c)
up/down
: The arrow up / down button is used to change the program set points.
d)
enter
: accept the changes and stores the settings.
To change the set point:
1) Press and hold the (
clear
) and (
mode
) buttons for 5 seconds.
2) Now press the (
mode
) button nine times to display the current set point. (
RELAY
is displayed)
3) Use the (
up
) and (
down
) arrow buttons to change the set point.
4) Press
(
enter
) to accept the change.
5) Press
(
clear
) to return the unit to RUN mode. (
CO
2
____PPM
is displayed)
CALIBRATION
The PPM-1c is factory calibrated. The sensor onboard the PPM-1c is capable of remaining in calibration for a minimum of
three years. Extreme shock during shipping and other factors may affect the calibration. By bringing the unit outdoors, you
can do a quick check of the calibration. The reading outdoors should be between 250-550 PPM. If the display does not read
250-550 PPM, a simple calibration can be performed.
