Multirae Pro Flashcards
What 5 gases does the MultiRAE pro detect
LEL, Oxygen, H2S, CO, Volatile organic compounds (VOCs)
High-Low alarm levels for LEL
10%-20%
High-Low alarm levels for O2
19.5-23.5
High-Low alarm levels H2S
10ppm-15ppm
High-Low alarm levels for CO
35ppm-100ppm
High-Low alarm levels for VOCs
50ppm-100ppm
What contaminants may give false readings, damage sensors, or damage meter?
Organic silicones, silicates, Lead containing compounds
What are VOCs
Modern industrial compounds such as fuel, coatings, solvents,etc. high FP, volatile, evaporate easily.
What is the highest IP the MultiRAE can detect?
10.6eV is the highest IP it can detect
How does the MultiRAE read VOCs?
3 diff PID sensors, one reads PPM from 0.1-5000 ppm; the other from 1-1000 ppm and the 3rd reads in PPB from 10-2000 ppb
What do you want to do with the meter just prior to metering the HAZ area?
A. Block pump inlet to make sure it’s working. Press rest.
B. Bump test. (If fails, recalibrate meter)
C. Confirm measurement gas (conversion factor) is set appropriately.
What are “conversion factors”?
Values that must be multiplied by the reading, in LEL or VOCs, to get the true reading of a known chemical.
Describe the MultiRAE probe and how long it takes for gas to reach the meter
Filter on the inlet tube of the meter it self, made out of plastic, intrinsically safe.
If using wand or tubing, takes about 1 sec/ft of tubing and wand for gas to reach meter.
How do you bump test the meter? How often?
After meter has finished its warmup screen and is in the Home Screen, press and hold the Y/+ and N/- keys at the same time. The multi sensor bump screen will appear, apply 4 gas and press start. When finished it’ll say pass or fail. The next screen will be to bump the PID sensor. Apply the gas, press start. When finished the meter will go back to the home page.
Or
Press the O and N/- buttons at the same time. Select the bottle, select “multi sensor bump” and follow prompts.
The meter should be preformed once a week and before/after every call
What do you do if the meter does not pass?
Meter must be calibrated, if it still fails, green tag and send in for repairs.
What gas do we calibrate LEL, O2, CO, and H2S on?
Multi gas- methane, O2, CO, H2S
What gas do we calibrate VOCs on?
Isobutylene
Steps to manually calibrate meter
1.meter must be in fresh air.
2.Home Screen press O and N/- same time
3.select calibration bottle
4.select multi sensor span
5.attach 4 gas and select start
6.see pass or fail, PID calibration starts
7.apply isobutylene, press start
8.PID done, back button to home page
How to turn off meter
Press and hold O button for 5 sec
How do you change the conversion factor for LEL and VOCs?
Hold O and N/- at same time
Go to 999ppm icon
Select change meas gas
Pick LEL or VOCs
Select gas library
Select gas you want to use
Back to Home Screen
The LEL and VOC will flash once every 5 sec to show what conversion factor you’re in.
What type of battery is in the meter?
Lithium ion rechargeable batteries. Should be on charger when not in use.
Spare alk batt comes with meter in case lithium ion battery goes dead
When using instrument to meter for combustible liquids w/ flash points above 100°F what area of the meter should be watched (read)?
VOCs. High carbon molecule products (greater than 9) may give erroneous low readings in the LEL area.
Proper metering techniques
Moving slowly allowing meter to read
Meter high and low
Know the MW of the product
How do you get the backlight to illuminate?
Press any button
