159 Appendix D
General: Mechanical
EVM Series User Manual
General: Mechanical
1. Manifold positioned over
sensors: What is the long,
black plastic bar over the
sensors and how is it
used?
The manifold is used to improve response time during the calibration process
and use (running, logging, and viewing measurements).
2. What is the Path for Gas
(Toxic, CO
2
and PID)
Refer to Figure 1-3 in Chapter 1.
CO
2
Sensor and how to reorder
1. How do I order/reorder a
CO
2
sensor?
Since the CO
2
sensor vendor changed in June 2012, there are two CO
2
sensor
options to order/reorder depending on the model you purchased. See
Appendix A, “Accessories: Replacement and Optional Parts section for specific
reorder part information.
To determine the appropriate CO
2
sensor part number, do one of the following:
Method One: Removing the CO
2
sensor from the EVM housing
Sensors’ Locations and Removing
(The diagram below is based on the EVM-7 model.)
NOTE: Verify the unit is off and unplugged from the power cord before
removing or inserting sensors.
Remove the sensor bar (via the screws) and manifold.
Remove the CO
2
sensor by gently lifting the sensor from the housing.
NOTE: To insert, align the socket pins to the circuit board accordingly.
Sensor bar – Remove screw 1 & 2 and lift off cover
Screw 2
PID sensor
CO
2
sensor
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