DQRID : D061206.3
Start DateStart TimeEnd DateEnd Time
05/04/2006180008/11/20061445
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Subject:
NIM/AOS/M1 - Flow controller failure
DataStreams:nimaosccnM1.a1, nimaosauxM1.a1, nimaosM1.a1
Description:
Following a power outage at the site both a PID controller for the main sample flow as 
well as a circuit board on the reference nephelometer were inoperable. The PID controller 
was replaced on 5/18 and the neph circuit board was replaced on 6/22. On a site visit in 
August the mentor found the PID had not been programmed correctly and was reading erroneous 
flows. The actual flow was at 50% of the recorded flow. Because the sample flow is 
diluted by 50% this makes most if not all of the sample flow from 5/18 to 8/11 from the diluter.
Suggestions: 
Measurements:nimaosM1.a1:
  • Aerosol backwards-hemispheric light scattering coefficient, blue channel, 1 um
    size cut, reference three wavelength nephelometer(Bbs_B_Dry_1um_Neph3W_1)
  • Aerosol total light scattering coefficient, red channel, 10 um particle size(Bs_R_Dry_10um_Neph3W_1)
  • Aerosol backwards-hemispheric light scattering coefficient, red channel, 10um(Bbs_R_Dry_10um_Neph3W_1)
  • Aerosol total light scattering coefficient, reference nephelometer green
    channel, 10 um particle diameter(Bs_G_Dry_10um_Neph3W_1)
  • Pressure inside reference nephelometer(P_Neph_Dry)
  • Absorption coefficient, green wavelength, 3 wavelength PSAP, low RH, 10 um size
    cut(Ba_G_Dry_10um_PSAP3W_1)
  • Temperature inside of wet nephelometer inlet(T_NephVol_Wet)
  • Absorption coefficient green, corrected for flow and sample area, 3 wavelength
    PSAP, 1 um size cut(Ba_G_Dry_1um_PSAP3W_1)
  • Back-scattering coefficient, red wavelength, high RH, 1 um size cut(Bbs_R_Wet_1um_Neph3W_2)
  • Absorption coefficient, blue wavelength, 3 wavelength PSAP, low RH, 1 um size
    cut(Ba_B_Dry_1um_PSAP3W_1)
  • Aerosol backwards-hemispheric light scattering coefficient, Humidograph
    nephelometer green channel, 10 um particle diameter(Bbs_G_Wet_10um_Neph3W_2)
  • Aerosol backwards-hemispheric light scattering coefficient, blue channel, 10um(Bbs_B_Dry_10um_Neph3W_1)
  • Aerosol total light scattering coefficient, Humidograph nephelometer green
    channel, 10 um particle diameter(Bs_G_Wet_10um_Neph3W_2)
  • Aerosol total light scattering coefficient, blue channel, 10 um size cut,
    reference three wavelength nephelometer(Bs_B_Dry_10um_Neph3W_1)
  • Absorption coefficient, blue wavelength, 3 wavelength PSAP, low RH, 10 um size
    cut(Ba_B_Dry_10um_PSAP3W_1)
  • Aerosol total light scattering coefficient, Humidograph nephelometer red
    channel, 10 um particle diameter(Bs_R_Wet_10um_Neph3W_2)
  • Aerosol backwards-hemispheric light scattering coefficient, blue channel, 10 um
    size cut, wet three wavelength nephelometer(Bbs_B_Wet_10um_Neph3W_2)
  • Temperature at reference nephelometer inlet(T_NephInlet_Dry)
  • Relative humidity, inside Humidograph nephelometer(RH_NephVol_Wet)
  • Relative humidity, reference nephelometer inlet(RH_NephInlet_Dry)
  • Condensation nuclei concentration number(N_CPC_1)
  • Temperature inside reference nephelometer(T_NephVol_Dry)
  • Aerosol backwards-hemispheric light scattering coefficient, green channel, 1 um
    size cut, reference three wavelength nephelometer(Bbs_G_Dry_1um_Neph3W_1)
  • Aerosol backwards-hemispheric light scattering coefficient, Humidograph
    nephelometer blue channel, 1 um particle diameter(Bbs_B_Wet_1um_Neph3W_2)
  • Pressure inside humidified nephelometer(P_Neph_Wet)
  • Absorption Coefficient Red, corrected for flow and sample area, 3 wavelength
    PSAP, 1 um size cut(Ba_R_Dry_1um_PSAP3W_1)
  • Aerosol light absorption coefficient, green channel, 10 um particle diameter(Ba_G_Dry_10um_PSAP1W_1)
  • Aerosol backwards-hemispheric light scattering coefficient, reference
    nephelometer red channel, 1 um particle diameter(Bbs_R_Dry_1um_Neph3W_1)
  • Aerosol total light scattering coefficient, Humidograph nephelometer green
    channel, 1 um particle diameter(Bs_G_Wet_1um_Neph3W_2)
  • Aerosol light absorption coefficient, green channel, 1 um particle diameter(Ba_G_Dry_1um_PSAP1W_1)
  • Aerosol total light scattering coefficient, reference nephelometer red channel,
    1 um particle diameter(Bs_R_Dry_1um_Neph3W_1)
  • Aerosol total light scattering coefficient, humidograph nephelometer blue
    channel, 1 um particle diameter(Bs_B_Wet_1um_Neph3W_2)
  • Aerosol total light scattering coefficient, blue channel, 10 um size cut, wet
    three wavelength nephelometer(Bs_B_Wet_10um_Neph3W_2)
  • Aerosol backwards-hemispheric light scattering coefficient, humidograph
    nephelometer red channel, 10 um particle diameter(Bbs_R_Wet_10um_Neph3W_2)
  • Aerosol total light scattering coefficient, ref. humidograph nephelometer green
    channel, 1 um particle diameter(Bs_G_Dry_1um_Neph3W_1)
  • Temperature at wet nephelometer inlet(T_NephInlet_Wet)
  • Back-scattering coefficient, green wavelength, low RH, 10 um size cut(Bbs_G_Dry_10um_Neph3W_1)
  • Aerosol total light scattering coefficient, Humidograph nephelometer red
    channel, 1 um particle diameter(Bs_R_Wet_1um_Neph3W_2)
  • Relative humidity inside reference nephelometer inlet(RH_NephVol_Dry)
  • Back-scattering coefficient, green wavelength, high RH, 1 um size cut(Bbs_G_Wet_1um_Neph3W_2)
  • Aerosol total light scattering coefficient, Ref. Humidograph nephelometer blue
    channel, 1 um particle diameter(Bs_B_Dry_1um_Neph3W_1)
  • Absorption Coefficient Red, corrected for flow and sample area, 3 wavelength
    PSAP, 10 um size cut(Ba_R_Dry_10um_PSAP3W_1)
  • Relative humidity, Humidograph nephelometer inlet(RH_NephInlet_Wet)
more
nimaosauxM1.a1:
  • AOS PSAP3W transmittance, blue channel(TrB)
  • AOS PSAP3W transmittance, green channel(TrG)
  • AOS PSAP3W transmittance, red channel(TrR)
more
nimaosccnM1.a1:
  • AOS CCN sample saturation setpoint value reported by instrument(CCN_ss_set)
  • AOS CCN volumetric flowrate of sample air(CCN_Q_sample)
  • AOS CCN logical value, indicating whether the instrument has reached thermal
    gradient stabilization and is within 0.4 degrees C of the set point(CCN_temp_unstable_flag)
  • AOS CCN sample pressure(CCN_P_sample)
  • AOS CCN temperature of sample air entering the column(CCN_T_sample)
  • AOS CCN temperature of the nafion humidifier(CCN_T_nafion)
  • AOS CCN temperature at top of column(CCN_T_TEC1)
  • AOS CCN temperature at middle of column(CCN_T_TEC2)
  • CCN temperature gradient(CCN_Temperature_Gradient)
  • AOS CCN temperature at bottom of column(CCN_T_TEC3)
  • AOS CCN sample supersaturation calculated by model)(CCN_ss_calc)
  • Size of upper limit of each CCN bin(CCN_UpperSizeLimit)
  • CCN Propotional valve voltage(CCN_ProportionalValveVoltage)
  • AOS CCN standard deviation of difference (CCN_T_TEM1 - CCN_T_TEC3)(CCN_dT_TEC3_TEC1_StdDev)
  • AOS CCN temperature of the optical particle counter(CCN_T_OPC)
  • Bin number of lowest channel of OPC include in summation of N_CCN(N_CCN_bin_number)
  • Cloud condensation nuclei number density(N_CCN)
  • AOS CCN OPC laser current(CCN_laser_current)
  • AOS CCN volumetric flowrate of sheath air(CCN_Q_sheath)
  • AOS CCN number concentration by bin(N_CCN_dN)
  • AOS CCN temperature of sample air at entrance to instrument(CCN_T_inlet)
  • First stage monitor voltage(CCN_FirstStageMonitorVoltage)
more

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