3M 3MTM quick start Maintenance/Cleaning, Sensors Locations, Impactor Care and Particulates

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.

Manifold

• When removing/inserting, align the socket pins to the circuit board accordingly.

Sensor bar - Remove screw 1 & 2 and lift off cover

Screw 1

Screw 2

PID sensor

Toxic sensor

CO2 sensor

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 very thin film 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)