Toxic and Carbon Dioxide Span Calibration
To perform a span calibration with a specific toxic gas, please reference the toxic gas table. For the CO2 span calibration, the range (or span) should be a sizeable fraction of the selected full scale range of the gas.
;; NOTE: The range for the CO2 sensor is 0 to 5,000 ppm. For a span calibration, it is recommended to span cal to the value you will be measuring (i.e., 2,000 ppm).
1.Connect the appropriate gas, regulator, tubing and cal cap to the EVM.
2.Follow steps
Logging Toxic Gases or Carbon Dioxide
1. From the Start screen or any Measurement screen, press key.
•To view gas measurements, select either the Gas or Composite screens
(by pressing 
from the start screen when Setup is selected.)
2.Press 
key to stop logging. (See “Viewing logged results” to access past sessions.)
Run Icon |
|
CO2 value | Composite |
Toxic (CO) | Measurement screen |
value |
|
Particulate advanced calibration (Gravimetric filtering)
Gravimetric Calibration Overview
(1)Reset the gravimetric and volume accumulators; (2) Insert a new (sealed) gravimetric cassette; (3) Measure in the specific location for approximately four to eight hours; (4) Notate the value displayed in the gravimetric accumulator field (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 filtered contents. (Typically, sent 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 filter lab analysis.
Measuring particulates
1. | From the start screen or any measurement screen, press the | key. (Prior to | |
| logging, a 5 second |
| |
2. | Press | key to end the logged session. (See “Viewing logged results” to view past | |
| sessions.) |
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