3M 3MTM Marine Instruments User Manual


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Particulate Zero Calibration
Priortocalibrating,ensuretheimpactorsarewell-greasedwithanappliedthin-lmofsilicone
grease. (Please see “Impactor Care” on page 10 or EVM series user manual.)
1. Attach the Zero/HEPAlterandtubingintotheturret.RotatetheturrettoPM.
2. Select Calibration from the Start screen and select PM (using up/down arrows).
3. Press Cal softkey and then press Start softkey. Once level is stabilized, press Set softkey.
4. Once level has been set, you can press Save or Cancel. (Please refer to Chapter 4 of
EVM series manual for more information.)
; NOTE:Oncesaved,theinstrumentwillapplythezerocalibrationtoallproles.Thezerocalibrationis
stored in the History screen and a calibration. Verify can be performed (to ensure no drifting).
Particulate Advanced Calibration (Gravimetric)
Gravimetric Calibration Overview
(1)Reset the gravimetric and volume accumulators; (2) Insert a new (sealed) gravimetric cassette; (3)
Measureinthespeciclocationforapproximatelyfourtoeighthours;(4)Recordthevaluedisplayedin
thegravimetricaccumulatorelddisplayedintheparticulatescreen.(Thisvalueisusedinconjunction
with the weight of the measured dust in the cassette.); (5) Remove the gravimetric cassette and weigh the
lteredcontents.(Typically,sendtoalabforresults.);(6)Todeterminethecorrectionfactor,calculatethe
ratiobetweentheparticulatemassvalueandtheweightfromthegravimetriclterlabanalysis.(Ratio=true
weight/EVM gravimetric displayed value). (7) Enter user correction value (Setup\Particulate screen. Select
proleeldandthenpressEditsoftkey.AddFactorusingup/downarrows.PressOn/OFF/Esckeytwiceto
return to start screen.)
Logging Particulates
1. Before logging particulates, ensure the impactors are clean and well-greased.
2. From the start screen or any measurement screen, press key.
3. Press key to end the logged session. (See “Viewing logged results” to access past
sessions.)
Zero/HEPAlterexample
Used for particulate zero cal.
Tubing and vent opening
Insert tubing into the impactor of the
labeled “2.5” vent opening
Turret
Turn the turret so “PM” appears on the
display of the EVM.
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