PREVIEW OF

HAZMAT TECHNICIANDETECTION DEVICES

POWERPOINT TRAINING PRESENTATION

WHY MONITOR?

IDLH ConditionsHazard determinationPPE selectionRespiratory protectionEstablish work zones (hot, warm, cold)Sudden release warningMedical surveillance

INSTRUMENT FACTORS

Properly operated equipmentCalibration checkedReading within instrument rangeResponse timeSafety of instrumentReliability of power

RULES OF OPERATION

Be conservativeCalibrateRead a small response as positiveZero reading does not mean clean airUse multiple instrument types

CAUSES FOR INSTRUMENT ERROR

Is the proper instrument being used?What is the LEL or LFL of the material?Is the oxygen level high enough for instrument to work?

COMBUSTIBLE GAS INDICATORS

AKA explosive meterTo recognize flammable or combustible atmospheresNormally reads in percent of LELSome have alarms pre-set at predetermined LEL’s

OXYGEN METERSBased upon % oxygen in

atmosphereNormally reads from 0 to 25% oxygenRemember the oxygen level

for safe breathing (20.9% normal & 19.5% is

deficient)

OXYGEN MONITORING LEVELS

LEVEL AGENCY ACTION<19.5% EPA Monitor with SCBA, CGI values are not

valid19.5-25% EPA Continue monitoring with caution, SCBA

not needed based on oxygen content only19.5-23.5% OSHA Continue to monitor>25% EPA Explosion hazard, withdraw immediately>23.5% OSHA Explosion hazard, withdraw immediately

DETECTOR TUBES

Can detect the presence of a single gas or a specific group of gasesSome can detect the amount of a gas

ERRORSCertain gases can interfere with the gas being sampled causing a false readingAtmospheric conditions can cause false

readings i.e. barometric pressure, humidity, temperatureManufacturers directions will tell you how

to adjust readings for these conditions

RADIATION SURVEY

Can determine the type of radiation and its level

COMBINED INSTRUMENTS

Newer instruments may have multiple sensors allowing for one instrument to be used for many gases

GASES TO BE MONITORED

Oxygen levels may need be the first checkedSafe levels may be between 19.5 & 23.5% oxygenLevels <19.5% will not support lifeLevels >23.5% will enrich flammability

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