ASI/CCN/M1 - Instrument troubleshooting

Troubleshooting instrument flow issues. No valid data.

Do not use the data from this time period.

• Volumetric flow rate of sample air(Q_sample)
• Sample supersaturation calculated via Lance/Rose method(supersaturation_calculated)
• Droplet bin bounds(droplet_size_bounds)
• First bin used in N_CCN_reduced calculation.(first_bin_used)
• N_CCN calculated excluding counts below "first_bin_used"(N_CCN_reduced)
• aerosol particle number concentration(aerosol_number_concentration)
• Supersaturation set point values(setpoint)
• Size bins for CCN droplet count(droplet_size)
• Cloud condensation nuclei number density(N_CCN)
• Number of particles that are larger than 10um(overflow)
• AOS CCN number concentration by bin(N_CCN_dN)

• AOS CCN set temperature for the Nafion humidifier, second column(CCN_T_nafion_set_2)
• AOS CCN set temperature for the Nafion humidifier, first column(CCN_T_nafion_set_1)
• AOS CCN set point for temperature at middle of column, first CCN(CCN_T_set_TEC2_1)
• AOS CCN set temperature for the Nafion humidifier, second CCN(CCN_nafion_set_2)
• AOS number concentration of CCN at supersaturation step 2(N_CCN_2)
• AOS number concentration of CCN at supersaturation step 1(N_CCN_1)
• AOS CCN temperature of the optical particle counter, second column(CCN_T_OPC_2)
• AOS CCN temperature of the optical particle counter, first column(CCN_T_OPC_1)
• AOS CCN set point for temperature at middle of column, second column(CCN_T_set_TEC2_2)
• AOS CCN observed temperature at top of column, first CCN(CCN_T_read_TEC1_1)
• CCN Proportional valve voltage, first column(CCN_proportional_valve_voltage_1)
• AOS CCN observed temperature at top of column, second CCN(CCN_T_read_TEC1_2)
• CCN Proportional valve voltage, second column(CCN_proportional_valve_voltage_2)
• AOS CCN set temperature for the Nafion humidifier, first CCN(CCN_nafion_set_1)
• AOS CCN sample pressure, second CCN(CCN_P_sample_2)
• AOS CCN sample pressure, first column(CCN_P_sample_1)
• AOS CCN sample saturation setpoint value reported by instrument, first CCN(CCN_ss_set_1)
• AOS CCN sample saturation setpoint value reported by instrument, second CCN(CCN_ss_set_2)
• First stage monitor voltage, first column(CCN_first_stage_monitor_voltage_1)
• Hexadecimal flag, non-zero value means instrument is not operating stably, first
  CCN(CCN_temp_unstable_flag_1)
• First stage monitor voltage, second column(CCN_first_stage_monitor_voltage_2)
• Hexadecimal flag, non-zero value means instrument is not operating stably,
  second CCN(CCN_temp_unstable_flag_2)
• AOS CCN set point temperature for the inlet manifold, first column(CCN_T_inlet_set_1)
• AOS CCN temperature of sample air at entrance to instrument, second column(CCN_T_inlet_set_2)
• AOS CCN set point temperature for the optical partical counter (OPC), second CCN(CCN_OPC_set_2)
• AOS CCN set point temperature for the optical partical counter (OPC), first CCN(CCN_OPC_set_1)
• AOS bin number of lowest channel of OPC include in summation of N_CCN, first
  column(N_CCN_bin_number_1)
• AOS CCN set point for temperature at bottom of column, second column(CCN_T_set_TEC3_2)
• CCN alarm code expressed as a summation of powers of 2. 0 indicates no detected
  problem(CCN_alarm_code)
• AOS bin number of lowest channel of OPC include in summation of N_CCN, second
  column(N_CCN_bin_number_2)
• AOS CCN set point for temperature at bottom of column, first CCN(CCN_T_set_TEC3_1)
• Number of particles that are larger than 10um, second column(CCN_overflow_2)
• AOS CCN set point temperature for the inlet manifold, first CCN(CCN_inlet_set_1)
• AOS CCN set point temperature for the inlet manifold, second CCN(CCN_inlet_set_2)
• Number of particles that are larger than 10um, first column(CCN_overflow_1)
• Droplet bin bounds(size_bin_bounds)
• AOS CCN logical value, indicating whether the instrument has reached thermal
  gradient stabilization and is within 0.4 degrees C of the set point, first
  column(CCN_temp_unstable_1)
• AOS CCN logical value, indicating whether the instrument has reached thermal
  gradient stabilization and is within 0.4 degrees C of the set point, second
  column(CCN_temp_unstable_2)
• AOS CCN sample supersaturation set point value reported by instrument, second
  column(CCN_supersaturation_set_point_2)
• AOS CCN sample supersaturation set point value reported by instrument, first
  column(CCN_supersaturation_set_point_1)
• AOS CCN volumetric flowrate of sample air, second CCN(CCN_Q_sample_2)
• AOS CCN volumetric flowrate of sample air, first CCN(CCN_Q_sample_1)
• AOS CCN (read) temperature at bottom of column, first CCN(CCN_T_read_TEC3_1)
• AOS CCN (read) temperature at bottom of column, second CCN(CCN_T_read_TEC3_2)
• CCN temperature gradient, first CCN(CCN_temperature_gradient_1)
• CCN temperature gradient, second CCN(CCN_temperature_gradient_2)
• AOS CCN set point for temperature at top of column, second column(CCN_T_set_TEC1_2)
• AOS CCN set point for temperature at top of column, first column(CCN_T_set_TEC1_1)
• AOS CCN droplet count by bin size, first column(N_CCN_dN_1)
• AOS CCN number concentration by bin, second CCN(N_CCN_dN_2)
• AOS CCN volumetric flow rate of sheath air, first column(CCN_Q_sheath_1)
• AOS CCN volumetric flowrate of sheath air, second CCN(CCN_Q_sheath_2)
• CCN alarm code expressed as a summation of powers of 2. 0 indicates no detected
  problem, first column(CCN_alarm_code_1)
• CCN alarm code expressed as a summation of powers of 2. 0 indicates no detected
  problem, second column(CCN_alarm_code_2)
• AOS CCN voltage used by DMT for OPC diagnostic purposes, first CCN(CCN_baseline_monitor_1)
• AOS CCN voltage used by DMT for OPC diagnostic purposes, second column(CCN_baseline_monitor_2)
• AOS CCN OPC laser current, first column(CCN_laser_current_1)
• AOS CCN OPC laser current, second column(CCN_laser_current_2)
• Size bins for CCN droplet count(size_bin)
• AOS CCN observed temperature at middle of column, first column(CCN_T_read_TEC2_1)
• Size of upper limit of each CCN bin(CCN_upper_size_limit)
• AOS CCN temperature of sample air entering the column, second column(CCN_T_sample_2)
• AOS CCN temperature of sample air entering the column, first column(CCN_T_sample_1)
• AOS CCN observed temperature at middle of column, second column(CCN_T_read_TEC2_2)
• AOS CCN Nafion temperature, first CCN(CCN_T_nafion_1)
• AOS CCN Nafion temperature, second column(CCN_T_nafion_2)
• AOS CCN temperature of sample air at entrance to instrument, second CCN(CCN_T_inlet_2)
• AOS CCN temperature of sample air at entrance to instrument, first_column(CCN_T_inlet_1)

• (Raw data stream - documentation not supported)

• Sample pressure(P_sample)
• Droplet bin bounds(droplet_size_bounds)
• Temperature read of sample air entering the column(T_sample)
• Volumetric flow rate of sample air(Q_sample)
• Estimated target thermal gradient under current operating conditions(dT_target_estimated)
• Lookup table for eta computation(eta_lookup_table)
• Bin number of lowest channel of OPC include in summation of N_CCN(N_CCN_bin_number)
• seconds since last impactor transition(seconds_after_transition)
• Logical value, indicating whether the instrument has reached thermal gradient
  stabilization and is within 0.4 degrees C of the set point(temp_unstable)
• Eta factor used in calculation of
  supersaturation_calculated_estimated_equilibrium_target(eta_target)
• Temperature read of the optical particle counter(T_OPC)
• Sample supersaturation calculated via Lance/Rose method(supersaturation_calculated)
• Nafion temperature(T_nafion)
• Reported temperature difference between T_set_TEC3 and T_set_TEC1(reported_temperature_gradient)
• Number of particles that are larger than 10um(overflow)
• Temperature set point at top of column(T_set_TEC1)
• Temperature set point at middle of column(T_set_TEC2)
• Cloud condensation nuclei number density(N_CCN)
• Temperature set point at bottom of column(T_set_TEC3)
• Standard deviation of (T_read_TEC3 - T_read_TEC1)(temperature_std)
• Temperature read at bottom of column(T_read_TEC3)
• Size bins for CCN droplet count(droplet_size)
• Temperature read at middle of column(T_read_TEC2)
• T_OPC - T_read_TEC3 temperature difference(dT_OPC)
• Temperature read at top of column(T_read_TEC1)
• AOS CCN number concentration by bin(N_CCN_dN)
• First stage monitor voltage(first_stage_monitor_voltage)
• Temperature difference between T_read_TEC3 and T_read_TEC1(T_read_gradient)
• Target supersaturation calculated via Lance/Rose method, computed from
  eta_target(supersaturation_calculated_target)
• Sample supersaturation set point value reported by instrument(supersaturation_set_point)
• Eta factor used in calculation of supersaturation_calculated(eta)
• OPC laser current(laser_current)
• CCN Proportional valve voltage(proportional_valve_voltage)
• Temperature read of sample air at entrance to instrument(T_inlet)
• Volumetric flow rate of sheath air(Q_sheath)
• Temperature difference between T_set_TEC3 and T_set_TEC1(T_set_gradient)

• Absolute relative error between N_CCN measurement and fit(N_CCN_fit_error)
• Coefficients for quadratic fit of N_CCN vs supersaturation(N_CCN_fit_coefs)
• Cloud condensation nuclei number density(N_CCN)
• Supersaturation set point(supersaturation_setpoint)
• Fitted value of N_CCN versus calculated supersaturation(N_CCN_fit_value)
• Ratio of N_CCN to concentration(f_CCN)
• Sample supersaturation calculated via Lance/Rose method(supersaturation_calculated)
• Supersaturation setpoint start time, relative to midnight(setpoint_time)
• Aerosol concentration averaged over times to match N_CCN(concentration)

• Temperature read at bottom of column(T_read_TEC3)
• Eta factor used in calculation of supersaturation_calculated(eta)
• Temperature read at middle of column(T_read_TEC2)
• Logical value, indicating whether the instrument has reached thermal gradient
  stabilization and is within 0.4 degrees C of the set point(temp_unstable)
• Temperature read at top of column(T_read_TEC1)
• AOS CCN number concentration by bin(N_CCN_dN)
• Lookup table for eta computation(eta_lookup_table)
• Sample supersaturation set point value reported by instrument(supersaturation_set_point)
• Cloud condensation nuclei number density(N_CCN)
• Bin number of lowest channel of OPC include in summation of N_CCN(N_CCN_bin_number)
• Temperature read of sample air at entrance to instrument(T_inlet)
• Sample pressure(P_sample)
• Temperature set point at bottom of column(T_set_TEC3)
• Temperature set point at middle of column(T_set_TEC2)
• Temperature read of the optical particle counter(T_OPC)
• Temperature set point at top of column(T_set_TEC1)
• First stage monitor voltage(first_stage_monitor_voltage)
• Sample supersaturation calculated via Lance/Rose method(supersaturation_calculated)
• Nafion temperature(T_nafion)
• Temperature read of sample air entering the column(T_sample)
• Standard deviation of (T_read_TEC3 - T_read_TEC1)(temperature_std)
• Volumetric flow rate of sheath air(Q_sheath)
• Reported temperature difference between T_set_TEC3 and T_set_TEC1(reported_temperature_gradient)
• CCN Proportional valve voltage(proportional_valve_voltage)
• Target supersaturation calculated via Lance/Rose method, computed from
  eta_target(supersaturation_calculated_target)
• Size bins for CCN droplet count(droplet_size)
• T_OPC - T_read_TEC3 temperature difference(dT_OPC)
• Estimated target thermal gradient under current operating conditions(dT_target_estimated)
• Volumetric flow rate of sample air(Q_sample)
• Temperature difference between T_read_TEC3 and T_read_TEC1(T_read_gradient)
• Droplet bin bounds(droplet_size_bounds)
• Temperature difference between T_set_TEC3 and T_set_TEC1(T_set_gradient)
• seconds since last impactor transition(seconds_after_transition)
• Eta factor used in calculation of
  supersaturation_calculated_estimated_equilibrium_target(eta_target)
• Number of particles that are larger than 10um(overflow)
• OPC laser current(laser_current)

• Sample supersaturation calculated via Lance/Rose method(supersaturation_calculated)
• Absolute relative error between N_CCN measurement and fit(N_CCN_fit_error)
• CCN estimated from smoothed coefficients(N_CCN_fit_smoothed)
• Temporally smoothed N_CCN fit coefficients.(N_CCN_fit_coefs_smoothed)
• Coefficients for quadratic fit of N_CCN vs supersaturation(N_CCN_fit_coefs)
• Cloud condensation nuclei number density(N_CCN)
• Ratio of N_CCN to concentration(f_CCN)
• Supersaturation set point(supersaturation_setpoint)
• Aerosol concentration averaged over times to match N_CCN(concentration)
• Fitted value of N_CCN versus calculated supersaturation(N_CCN_fit_value)
• Supersaturation setpoint start time, relative to midnight(setpoint_time)

• First bin used in N_CCN_reduced calculation.(first_bin_used)
• N_CCN calculated excluding counts below "first_bin_used"(N_CCN_reduced)
• Number of particles that are larger than 10um(overflow)
• Sample supersaturation calculated via Lance/Rose method(supersaturation_calculated)
• Supersaturation set point values(setpoint)
• AOS CCN number concentration by bin(N_CCN_dN)
• Size bins for CCN droplet count(droplet_size)
• aerosol particle number concentration(aerosol_number_concentration)
• Volumetric flow rate of sample air(Q_sample)
• Cloud condensation nuclei number density(N_CCN)
• Droplet bin bounds(droplet_size_bounds)