NSA/MET/C1 - CMH and 10m winds failure

At 0513GMT on 1/23 the atmos_pressure and CMH - temp, RH, DP & Sat. VP changed abruptly to 
unlikely values. The 10m winds failed at 1420GMT.

The CMH was repaired on 02/04/2010 at 2254GMT and the 10m winds sensor was replaced on 
02/05/2010 at 2100GMT.

• cmh_dew_point
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• qc_wspd_arith_mean
• qc_cmh_dew_point
• qc_wspd_vec_mean
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• cmh_vapor_pressure
• qc_cmh_temp
• cmh_sat_vapor_pressure
• qc_wdir_vec_mean
• Wind speed vector mean(wspd_vec_mean)
• wdir_vec_std
• qc_cmh_rh
• cmh_temp
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - CMH Data Missing

The GFCI had tripped causing the CMH to lose power.  All CMH variables are missing except 
CMHRH which reports 100% for the entire time.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - CMH Sent to Vendor for Repair

CMH connector on the transmitter enclosure that goes to the head unit degraded and failed. 
 System was removed and sent to the manufacturer for repair.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - CMH offline

CMH removed for repair.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - 10m wind sensor offline

The 10m wind sensor values were 0 m/s and 000 for wind direction. The sensor lost 
communications.

• qc_wdir_vec_mean
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• qc_wspd_arith_mean
• wdir_vec_std
• qc_wspd_vec_mean
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)

NSA/MET/C1 - CMH offline

Beginning 1/24/2011, the CMH went offline resulting in missing temperature and dewpoint 
measurements and erroneous vapor pressure, saturation vapor pressure, and RH measurements. 

Problem fixed with a power cycle.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_sat_vapor_pressure
• cmh_rh

SGP/MET/E13 - PWD data incorrect/missing

Data collection problems during the time period specified resulted in incorrect or missing 
PWD data.

• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• pwd_cumul_rain
• pwd_cumul_snow
• pwd_precip_rate_mean_1min
• pwd_pw_code_15min
• pwd_pw_code_1hr
• pwd_pw_code_inst
• pwd_err_code

SGP/MET/E13 - Missing PWD data

PWD data were missing due to an accidental reset on the instrument.

• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• pwd_cumul_rain
• pwd_cumul_snow
• pwd_precip_rate_mean_1min
• pwd_pw_code_15min
• pwd_pw_code_1hr
• pwd_pw_code_inst
• pwd_err_code

NSA/MET/C1 - CMH Failure

The Chilled Mirror Hydrometer (CMH) developed a short in the wiring harness. All CMH data 
missing or incorrect during the period listed.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - Wind sensor data missing

2m, 10m, 20m wind sensors went off-line 5/17 due to GFCI tripping caused by failing CMH.   
The 2m and 20m data wind sensor returned 6/6, but the 10m remained offline until 7/20 as 
the sensor was damaged.

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• wdir_vec_std
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)

• wdir_vec_std
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Wind speed vector mean(wspd_vec_mean)

NSA/MET/C1 - CMH communication failure

CMH lost communication with datalogger. All values from CMH were -6999 during this time 
resulting in the CMHRH flatlining at 100%. Communications was intermittent during entire 
time period.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - CMH failure

Starting 14:17 GMT on 12/4/2011 the CMH Dew Point began reporting missing value, CMH 
relative humidity was flat-lining at 100% and CMH saturated vapor pressure was flat-lined at a 
high value.  This condition continued very intermittently for several months.  Issue was 
frosting and a failed ventilation fan.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_rh
• cmh_sat_vapor_pressure

SGP/MET/E13 - Low logger voltage

Low logger voltage was reported. Low voltage may result in data spikes or dropouts.

• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• pwd_cumul_rain
• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• vapor_pressure_mean
• logger_temp
• temp_std
• vapor_pressure_std
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• pwd_precip_rate_mean_1min
• pwd_pw_code_15min
• tbrg_precip_total
• pwd_pw_code_1hr
• pwd_pw_code_inst
• Barometric Pressure(atmos_pressure)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• Mean Air Temperature or Hardware Error(temp_mean)
• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)
• pwd_cumul_snow
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• rh_std
• logger_volt
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)
• pwd_err_code

NSA/MET/C1 - 10m wind data not reporting

10 meter wind speed and direction data were not reporting after a scheduled power outage 
took place.   Sensor was replaced.

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• wdir_vec_std
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)

• wdir_vec_std
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Wind speed vector mean(wspd_vec_mean)

NSA/MET/C1 - Incorrect liquid precipitation accumulation

A problem with the present weather detector's firmware caused negative precipitation 
accumulation to be recorded. The problem was fixed with a sensor swap.

• pws_cumul_rain