Honeywell Searchpoint Optima Plus - 15.3 Cross Interference to Other Gases and Vapours

MAN0905_Issue 7_07/17 Searchpoint Optima Plus with optional HART
®
output
Operating Instructions
2108M0550
79
15. Specications
Calibrated against EN60079-20-1:2010 LEL levels
Table Number Table Name CAS Number Full Scale LEL (%V/V) ATEX Performance
Approved
Standard Gases
D3240 Ethylene 74-85-1 100%LEL 2.3 Y
Special Gases
D3227 Benzene 71-43-2 100%LEL 1.2
D3229 Buta-1,3-diene 106-99-0 100%LEL 1.4
Calibrated against EN61779 LEL levels
Table Number Table Name CAS Number Full Scale LEL (%V/V) ATEX Performance
Approved
Standard Gases
D3228 Styrene 100-42-5 100%LEL 1.1
Note:Forothergases,solventsandvapours,contactHoneywellAnalytics.
Note:ThechoiceofLELvalueshouldbeinaccordancewithlocalregulations.
15.3 Cross Interference to Other Gases and Vapours
Searchpoint Optima Plus is supplied pre-calibrated and ready for installation. The signal output
conguration,gasandrangeforwhichtheunitiscalibratedareindicatedonalabelattachedtothemain
housing.
Note:ThefollowinginformationisonlyapplicablewhendetectingHydrocarbons.
A Searchpoint Optima Plus calibrated for a particular hydrocarbon will have a response to most other
hydrocarbongases.Thecross-sensitivityguresbelowareapproximateandareforguidanceonly.
Theapproximateamountofgasrequiredtogiveanoutputequalto50%LELmethane,onSearchpoint
OptimaPluscalibratedfor100%LEL(LEL=5%v/v)methaneis:-.
Methane 2.5 %v/v
Propane 0.3 %v/v
Butane 0.2 %v/v
Hexane 0.3 %v/v
Heptane 0.3 %v/v
Propylene 0.8 %v/v
ThefollowinggasesareknowntoproduceanegativeresponsefromSearchpointOptimaPlus:-
• Ammonia
• Acetylene
• Propyne (Methyl Acetylene)
As a guide, the approximate concentrations that will create a Fault condition in a Searchpoint Optima Plus
calibratedformethaneare:-
Ammonia ~ 5500 ppm
Acetylene ~ 1000 ppm
Propyne (Methyl Acetylene) ~ 1000 ppm