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.
To check for correct calibration:
1)
Bring the unit outside so that it will receive fresh air. Do not locate the unit in direct sunlight.
2)
Plug the power supply and power cord into 120vac.
3)
Move away from the controller to allow the reading to stabilize for approximately 20 minutes.
4)
Check the CO
2
level.
*Important: Do not breathe while checking the calibration the unit. As you exhale, large concentrations of
CO
2
are expelled from your lungs. This higher level of CO
2
will affect the calibration of the unit.
5)
If the level is between (250-550PM) the unit is performing fine. If it is outside that range, the unit can be re-calibrated.
To re-calibrate the unit:
1)
Bring the unit outside so that it will receive fresh air. Re-connect the power supply.
2)
Move away from the controller to allow the reading to stabilize for approximately 20 minutes.
3)
Check the CO
2
level. It should read around 350-450. If not, proceed with the calibration
*Important: Do not breathe near the PPM-3 while checking the calibration the unit. As you exhale, large concentrations
of CO
2
are expelled from your lungs. This higher level of CO
2
will affect the calibration of the unit.
4)
Press and hold the (
clear
) and (
enter
) buttons for 5 seconds.
5)
(
CAL AIR
is displayed) * If CAL NITROGEN is displayed, press MODE one time to bring up CAL AIR.
6)
Press (
enter
) to enter the calibration mode. (AIR-CAL and the current calibration point is displayed)
7)
Use the arrow UP / DOWN buttons to enter the new point to be calibrated to. *Normally 400-430 PPM
8)
Press (
enter
) to start the self-calibrating process. The green LED will flash as long as it is self-calibrating.
9)
Move away from the unit. After approximately 5 minutes the green LED will stop flashing and the display will return to
the normal run mode.
STATUS INDICATOR
The PPM-3 has a green LED indicator light on the front of the cover. If the LED is blinking, it indicates that the CO
2
sensor
is warming up and stabilizing. When the LED is ON, it means that the CO
2
level is being measured.
PRECAUTIONS
1)
DO NOT expose the PPM-3 to water. It utilizes a ventilated enclosure to properly “sample” the CO
2
.
2)
DO NOT connect loads greater than ½ amp @ 120vac to this unit.
WARRANTY
The PPM-3 is warranted against defects in workmanship for THREE years.
SPECIFICATIONS
Operating principle
Single-beam Non-Dispersive Infrared (NDIR)
Measurement range
0 – 5000 PPM CO
2
Warm-up time
Minimum 20 minutes (full accuracy)
Maximum drift per year
+/- 15 PPM
Accuracy @ 77’F
+/- 50 PPM
Recommended calibration interval
Three years
Operating voltages
18-24volt @ 250ma
Maximum amperage
½ amp @ 120vac
Operating temperature range
0-50’ C
Operating humidity range
0-99% RH (non-condensing)
Operating life expectancy
15 years typical
Warranty
Three years, parts and labor through repair or exchange.
PUBLISHED BY R & M Supply Inc.
COPYRIGHT 2004 BY R & M Supply Inc.
ALL RIGHTS RESERVED
www.capcontrollers.com
Liability statement:
R & M Supply and their retailers and distributors are not responsible for any damage or injuries (consequential or otherwise)
arising from the use of this device. The purchaser assumes all responsibility for the use and proper installation of this device.
