2.  OVERVIEW
2.3.3  Flow Housing 
Part Number: 2110B2140
The Flow Housing accessory provides a means of applying gas to the sensor for calibration and test 
(for details see section 4.7). It can also be used in sampling systems where a sample of gas is drawn 
through a tube to the sensor. Conforms to CSA C22.2 No. 152whenttedtotheCertiedSensor
withspeciccartridgesinstalled.Seespecicationsfordetails.
Itprovides:
 • Twoports8mmI/Dtotake6mmtubing.
 • Asealtostopgasdilution.
Thehousingworksirrespectiveofwhichpipethegasisappliedtoandowsgasacrossthefaceof
the sensor rather than onto its face. 
The difference in reading between a calibration made with the Flow Housing accessory and one 
madeunderdiffusionconditions(inatankofstillgas)islessthan30%.TheFlowHousingissuitable
forowratesintherangeof0.7-1litreperminuteowacrossthecell.
Ahydrophobiclterissuppliedwiththehousingwhichmust beusedwhencalibratingsensorstted
withammablegascartridges.
Whencalibratingsensorsttedwithothertypesofcartridgethentheltermountedinthesensorcap
fornormalgassensingoperation(iftted)mustberemovedandusedintheFlowHousing.
TheFlowHousingaccessoryisattachedtothesensorbymeansofabayonettting.