160 Appendix D
CO2 Sensor and how to reorder (continued)
EVM Series User Manual
CO
2
Sensor and how to reorder (continued)
Determine the type of installed CO
2
sensor by counting the number of pins on
the sensor. (See images below.)
7-pin CO
2
sensor (P/N 074-712)
image:
5-pin CO
2
senor (P/N 074-733)
image:
Method Two:
Using the Unit Information screen via the start screen (see A below), press
the Enter key until the CO
2
sensor appears on the screen (see B below). A
numeric serial code will be displayed to the right column of the CO
2
sensor.
Below are the two scenarios to denote the CO
2
sensor type:
7 pin sensor (074-712) is displayed by a 5 digit, 6 digit or 8 digit serial
number.
5 pin sensor (074-733) is displayed by a 10 digit serial number.
A: Start screen on the EVM with Unit
Information selected.
NOTE: Start screen appears when
powered on.
B: Unit Info screen with CO2 sensor
displayed.
Calibrating Sensors
1. What calibration gases or calibration equipment are needed for calibrating sensors on the EVM series?
Advanced calibration (correction
factors)
Performed with a zero/HEPA filter
(shipped in kit)
Gravimetric filtering (optional) is used to
determine a reference point/correction
factor relative to the Arizona Road Dust
factory calibration.
Example of CO
2
serial
number is: 00146 which
is the 7-pin sensor,
P/N 074-712.
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