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Thermo Scientific Orion Star A214 Benchtop and Star A324 Portable pH/ISE Meter Reference Guide
Automatic Blank (Non-linear) Correction Feature
5IF0SJPO4UBS"BOE4UBS"TFSJFT*4&NFUFSTIBWFBGFBUVSFLOPXOBTBVUPNBUJDCMBOLDPSSFDUJPO*OUIJT
UFDIOJRVFUIFNFUFSEFDJEFTXIFUIFSCMBOLDPSSFDUJPOJTUIFCFTUNFBTVSFNFOUTUSBUFHZCZBOBMZ[JOHUIFFMFDUSPEF
response during a multipoint calibration. A separate blank does not have to be run. Graphically, automatic blank correction
JTFRVJWBMFOUUPESBXJOHBTNPPUIDVSWFUISPVHIUIFMPXFTUUISFFQPJOUTPGUIFNVMUJQPJOUDBMJCSBUJPOBOEFYUSBQPMBUJOHUP
[FSPDPODFOUSBUJPOCBTFEPOUIFBTTVNQUJPOPG/FSOTUJBOFMFDUSPEFCFIBWJPS
.VMUJQPJOUDBMJCSBUJPOTBUUIFMPXFSMJNJUPGEFUFDUJPOBSFEFTJSBCMFXIFOUIFSFTQPOTFPGBOJPOTFMFDUJWFFMFDUSPEFJTOPO
MJOFBSBOEDBOOPUCFDIBSBDUFSJ[FEXJUIBPOFPSUXPQPJOUDBMJCSBUJPO5IJTJTVTVBMMZTFFOBTBMPXFMFDUSPEFTMPQF(FOFSBMMZ
UIFFMFDUSPEFJTCFIBWJOHJOB/FSOTUJBONBOOFSCVUUIFFGGFDUPGBCMBOLJTCFJOHPCTFSWFE4FFUIFmHVSFCFMPX
5IJTCMBOLNBZCFBUSVFSFBHFOUCMBOLUSBDFTPGBOBMZUFJPOJOUIFSFBHFOUTPSJUNBZCFUIFiNVEwWBMVFPGUIFFMFDUSPEF
*UDPVMEBMTPCFBOJOUFSGFSFODFJOUIFSFBHFOUTUIBUCFDPNFTBQQBSFOUBUMPXMFWFMTPGBOBMZUFJPOPSJUDPVMECFBOZ
DPNCJOBUJPOPGUIFTFFGGFDUT5IFFYQBOEFEWFSTJPOPGUIF/FSOTUFRVBUJPOUSBEJUJPOBMMZVTFEGPSCMBOLDPSSFDUJPOJTBT
GPMMPXT
E = Eo + S * log (C + b)
XIFSFCJTUIFCMBOL
*OBNVMUJQPJOUDBMJCSBUJPOBTFUPGFRVBUJPOTJTHFOFSBUFEBOEUIFSFMBUJPOTIJQCFUXFFOUIFNFWBMVBUFE'PSFYBNQMFUIF
FRVBUJPOTHFOFSBUFEJOBUISFFQPJOUDBMJCSBUJPOXPVMECFBTGPMMPXT
E1 = Eo + S * log (C1 + b)
E2 = Eo + S x log (C2 + b)
E3 = Eo + S x log (C3 + b)
5IFNFUFSFWBMVBUFTUIFSFMBUJPOTIJQTCFUXFFOUIFUISFFQPUFOUJBMT&&BOE&BOEUIFUISFFDPODFOUSBUJPOT$$BOE$
*GUIFSFMBUJPOTIJQTJOEJDBUFUIBUCMBOLDPSSFDUJPOJTEFTJSFEBCMBOLXJMMBVUPNBUJDBMMZCFDBMDVMBUFEBOEUIFOPOMJOFBSJUZXJMM
CFDPSSFDUFEGPSJOB/FSOTUJBONBOOFS*GUIFBQQSPQSJBUFDPOEJUJPOTBSFOPUNFUUIFCMBOLJTTFUBU[FSPBOEFBDITFHNFOUPG
the multipoint calibration is treated independently.
