Spanning The Detector; Maintenance; Cleaning; Battery Replacement - 3M 450 Serie Instrucciones De Uso

Spanning the Detector

. Make sure that the detector has been zeroed prior to spanning the detector (steps  to  above).
2. Remove the span adjustment cover screw (Fig. ).
. Attach the calibration hood to the sensor grill (Fig. ). To do this:
a. Line up the arrows on the cal hood with the slots on the sensor grill.
b. Insert one of the arrow's protruding snaps into the corresponding sensor-grill slot, and then push
down against the top of the other arrow until the snap clicks into the corresponding slot.
. Connect the hose from the gas regulator of the calibration gas bottle to calibration hood. Turn on the
gas. Apply at a rate of 0.2 liters per minute (lpm) for all sensors except for Chlorine (CL) sensors which
require 0. liters per minute (lpm). Do this for approximately  minutes to allow the sensor to stabilize.
. Insert a flat-headed screwdriver and align it with the span adjustment screw. Turn it counter-clockwise
until the display shows less than the span value for the detector.
6. Now, turn the span adjustment screw clockwise until the display shows the number corresponding to the
concentration of your calibration gas source.
Note: If you've turned the span adjustment screw as far as it will go and the display still does not show the
span value of the detector, the sensor has expired and must be replaced (see MAINTENANCE section).
7. Remove the calibration hood:
a. Slide the cal hood in the direction of one of the two arrows.
b. Gently press on the inlet nozzle of the cal hood to rotate it around the snap; doing this should
cause it to "click" out.
8. Re-install the span adjustment cover screw.
9. The unit is now ready for use.
Audio Alarm
Zero Adjustment
Cover Screw
Sensor Inlet
Span Adjustment
Cover Screw
Calibration Hood
Fig. 
2

MAINTENANCE

Cleaning

CAUTION
Avoid the use of harsh cleaning materials, abrasives and other organic solvents. Such materials may
permanently scratch the surfaces and damage the display window, labels, or instrument housing.
Cleaning of the external surfaces is best carried out using a damp cloth with a mild detergent or soap.

Battery Replacement

Battery must be replaced in a non-hazardous area only. Battery replacement is not an intrinsically safe
operation. Use only approved battery. Failure to do so may result in sickness or death.
CAUTION
Observe proper polarity when inserting the battery. Polarity is marked on the inside of the battery
compartment.
This instrument contains a lithium battery. Dispose of battery in accordance with local regulations.
. Ensure that the detector is turned off and remove the black rubber "boot" by gently pulling on the rubber
tab located above the pocket clip.
2. Remove the three screws located near the pocket clip and then gently separate the plastic casing.
. The lithium battery is now exposed and ready for replacement (Fig 6).
. Replace it with a new battery; make sure to observe the correct polarity indicated on the green circuit
board beneath the battery.

Sensor Replacement

. Ensure that the detector is turned off and remove the black rubber "boot" by gently pulling on the rubber
tab located above the pocket clip.
2. Remove the three screws located near the pocket clip and then gently separate the plastic casing.
. The sensor is now exposed and ready for replacement (Fig 6).
. Simply remove the sensor from its socket and replace it with a new sensor from M. Make sure to
calibrate the sensor and then allow it to stabilize for 2 -  minutes before using the detector.
Vibratory Alarm Replacement (Optional accessory for 0 series detectors or standard with  series detectors)
. Ensure that the detector is turned off and remove the black rubber "boot" by gently pulling on the rubber
tab located above the pocket clip.
2. Remove the three screws located near the pocket clip and then gently separate the plastic casing.
Fig. 
. The vibrating alarm motor is now exposed and ready for replacement (Fig. 6).
. Simply remove the motor from its socket and unplug the power leads from the circuit board.
. Plug the power leads on the new alarm into the socket on the circuit board and fit the black rubber
circular end in the socket in the side of the case.
6. Reassemble the unit and check the operation of all the alarms and of the unit by performing a calibration
verification test or calibration.
WARNING