MSA DF-8500, User Manual, Page: 57 / 66

DF-8500 Gas Detector
note that the sensors must be protected from exposure to high concentration solvent
vapors for storage or installation and use in the instrument.
Cross Sensitivity:
Cross sensitivity of the oxygen sensor:
There is no cross sensitivity for toxic gas or oxygen sensors under the threshold limit
value (TLV).
However, high concentration (such as over 1%) and strong oxidizing gas
(such as ozone and chlorine) will affect the oxygen equivalent, but most of the othe r
common gases will not be affected.
DF-8500 cross-sensitivity list for the hydrogen sulfide sensor:
DF-8500 cross-sensitivity list for the carbon monoxide sensor:
Precautions for using DF-8500 ETO, VCM and methanol sensor:
1) Must use polytetrafluoroethylene (Teflon)tube for calibration, and the tube is short as
much as possible to prevent adsorbing the gas.
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Gas Concentration values Reading
Acetylene 100 88
Ethylene 100 97
Hydrogen 100 <28
Nitric oxide 48.6 14
Nitrogen dioxide 19.5 <0.5
Chlorine 13.7 <0.5
Ethanol 200 0
Hydrogen sulfide 50 0
Sulfur dioxide 20 0
Ammonia 20 0
Gas Concentration values Reading
Carbon monoxide 100 <2
Sulfur dioxide 2 0
Nitrogen dioxide 3 0
Nitric oxide 25 0
Chlorine 0.5 0
Ethylene 100 0
Carbon dioxide 5000 0
Ammonia 50 0