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Maintenance/Cleaning
Sensors Locations
The gas sensors are inserted, factory calibrated, and ready for usage upon delivery. (The
diagram below is based on the EVM-7 model.) Occasionally , you may have to care for
the sensors which will require removing and inserting.
; NOTE: Verify the unit is off and unplugged from the power cord before removing or inserting
sensors.
1. Remove the sensor bar (via the screws) and remove
the manifold.
2. Sensor bar removal and location of sensors are displayed below.
• When removing/inserting, align the socket pins to the circuit board accordingly.
Impactor Care and Particulates
The impactor requires periodic greasing and cleaning for particulate measuring only.
1. Remove the turret (red housing cover over the impactor) by removing the right
and left screw with the supplied allen wrench (stored behind the access door.)
2. Remove all debris/dust with a Q-tip/cotton.
3. Wipe a verythinlm of silicone grease onto the metal plates using a Q-tip/cotton.
4. Re-attach by placing the turret cover over the housing and tighten screws.
Thin-layer of
silicone is applied to a
clean impactor.
Example of
accumulated dust
(will form into a pyramid)
CO
2
sensor
Toxic sensor
Sensor bar - Remove screw 1 & 2 and lift off cover
PID sensor
Screw 1
Screw 2
Manifold