DST ObservAir Скачать руководство пользователя страница 13

 

 

24 

ObservAir

 Operating Manual 

Command (cmd) 

Value (val) 

Function 

$setID 

0 to 1000 

Set sensor ID 

$setFR$val 

30 to 200 

Set sample flow rate in ccm 

$setSamplePeriod$val 

2 to 60 

Set measurement period in seconds 

$setTimeZone$val 

-12 to 12 

Set time zone in hours from GMT 

$syncTime$ 

N/A 

 Sync time with internet server (Time 
zone must be set)  

$setTime$YYYY,MM, 

DD,HH,MM,SS 

date/time 

Manually set clock to specified 
date/time 

$deviceInfo$ 

N/A 

Returns all sensor settings 

$setMaxATN$val 

10 to 150 

Set the maximum attenuation (ATN) 
value, above which alarm is triggered  

$ATNreset$ 

  

Reset the attenuation (ATN) to 0 

$setLEDmode$val 

BC, GAS1, 

GAS2, 

ALERT, OFF 

Set the LED to pollutant concentration 
display, alerts only, or turn off 

$setLEDmaxConc$val 

0.2 to 50 

Set maximum concentration displayed 
by LED button (red) 

$setLEDra$val 

60 to 3600 

Set running average size (in seconds) 
for the LED concentration display  

$setLEDtimeout$val 

0 to 60 

LED display timeout duration in 
minutes. 0 = LED on indefinitely.  

$setDLPF$ val 

0 / 1 

Toggle the DLP filter applied to the 
pollutant concentration data  

$setEnvComp$val 

0 / 1 

Toggle DST environmental 
compensation algorithms 

$setLTE$val 

0/1 

Toggle LTE enable 

$setGPS$val 

0 / 1 

Toggle GPS logging 

$setGPSsample 

Period$val 

2 to 60 

Set the GPS update period in seconds 

$setGasSignals$val 

0 / 1 

Toggle logging of gas sensor(s) signals 

$setSaveData$val 

0 / 1 

Toggle data logging (0 = no data is 
being saved to SD card) 

$setMAC$val 

9.0 to 15 

Set mass absorption coefficient (MAC)  

$setFRcal$val 

0.8 to 1.2 

Set flow rate calibration coefficient 

 

Table 7. 

ObservAir serial commands and descriptions  

 

 

25 

ObservAir

®

 Operating Manual 

3.7.

 

WiFi connection 

 
Provisioning  WiFi  credentials  to  the  ObservAir  allows  the  sensor  to 
automatically sync time, receive over the air (OTA) firmware updates and 
technical support. In the future, cloud-based services and a mobile app will 
also be available over the WiFi connections. Follow the instructions below 
to provision WiFi credentials: 
 
1.

 

Cycle  through  the  interactive  LED  button  menu  until  the  LED  flashes 
blue twice (provisioning mode).  

2.

 

The sensor will restart into provisioning mode, and slowly glow on and 
off  (‘breathe’)  in  a  blue  color  to  indicate  that  it  is  ready  and 
broadcasting a WiFi network.  

3.

 

From  a  computer  or  mobile  device,  log  onto  the  “Our  Product”  WiFi 
network.  

4.

 

A captive portal (Figure 13) will appear requesting your WiFi network’s 
SSID and password. The ObservAir is only compatible with 2.4 GHz WiFi 
networks. 

5.

 

Once  credentials  are  submitted,  the  ObservAir  will  restart  and  begin 
logging air quality measurements as usual.  

 

 

 

Figure 13. 

Screenshot of the ObservAir’s captive portal, as viewed from a 

mobile device. Enter you WiFi network’s credentials and press submit. 

  

When  WiFi  credentials  are  provisioned,  the  sensor  will  be  able  to 
automatically connect to the network and sync the internal clock time if a 
timestamp  error  is  detected  while  logging.  During  normal  operation,  the 
WiFi module remains powered off. WiFi is only enabled during over-the-air 
(OTA)  firmware  updates  and  technical  support.  WiFi  credentials  must  be 
provisioned using the instructions provided here prior to initiating any OTA 
software features.  

Содержание ObservAir

Страница 1: ...rational limits and warnings 11 3 Operating Instructions 13 3 1 Hardware overview 13 3 2 Interactive LED button Sensor display and control 14 3 2 1 Sensor startup 15 3 2 2 Default LED mode Pollutant c...

Страница 2: ...pport WiFi and USB communication protocols and include a 16GB removable SD card for onboard data storage Units may also be supplemented with an LTE LoRa or SigFox communication module and a GPS unit f...

Страница 3: ...collection area is 3 mm in diameter After the first filter the air flow passes through a second reference filter assembly that is identical to the first Since the air is filtered devoid of PM the int...

Страница 4: ...plication Operate the 7 ObservAir Operating Manual ObservAir for 12 to 24 hours in an environment that is free of the analyte gas es and average the voltage differential data collected over the entire...

Страница 5: ...technical specifications are summarized in the tables below All electrochemical cells are sourced from Spec Sensors Gas measurement performance specifications are adapted from data provided by the ma...

Страница 6: ...intervals 2 3 Operational limits and warnings Environmental limits Only operate the ObservAir within the conditions listed in Table 1 Temperature and relative humidity must remain between 5 to 40 C an...

Страница 7: ...nd may result in permanent damage to the unit and or harm to the user Please contact DST Technical Support at info dstech io regarding any problems with your unit that cannot be resolved with the inst...

Страница 8: ...llutants For every new start up event a new data file is created on the SD card txt file and is assigned a filename that contains the sensor s ID number and the start up time date Section 3 5 1 3 2 2...

Страница 9: ...f the ObservAir hold the LED button to cycle through the menu until the first red flash and release The sensor will flash red two more times to confirm that it is shutting down 3 2 6 Sensor alarms and...

Страница 10: ...ront panel 19 ObservAir Operating Manual 3 5 Data collection from onboard SD card While the ObservAir is operating data is written to the onboard SD card in real time as both a primary means of data c...

Страница 11: ...e ADC s raw count Full scale value is 8388607 d ATN Optical attenuation unitless e BC Black carbon in g m3 f T Temperature in C g RH Relative humidity in h FR Sample flow rate in ccm i VBAT Battery vo...

Страница 12: ...tings Figure 12 6 With the Serial Monitor configured ObservAir data is displayed in real time at the time interval set by the user Commands can also be sent to the sensor using the dialog box at the t...

Страница 13: ...8 to 1 2 Set flow rate calibration coefficient Table 7 ObservAir serial commands and descriptions 25 ObservAir Operating Manual 3 7 WiFi connection Provisioning WiFi credentials to the ObservAir allo...

Страница 14: ...1 Zero calibration of pollution sensors Each ObservAir comes with a zero calibration sheet but it is good practice to periodically verify the sensor s baseline performance especially before and after...

Страница 15: ...but clearly the calibration is only as good as the reference measurements collected 4 4 Leak check The ObservAir incorporates a monolithic design architecture that is more robust than traditional ins...

Страница 16: ...loading artifact is not static it depends on the emissions source e g biomass vs diesel atmospheric conditions seasonality and other factors Therefore filter loading correction algorithms should be c...

Страница 17: ...ing can be optimized to meet your needs For example if greater BC measurement resolution is desired at the expense of filter life the flow rate can be increased past the minimum value Conversely flow...

Страница 18: ...exhaust stacks vehicle tailpipes and other pollution sources When sampling emissions directly do not exceed the ObservAir s maximum temperature relative humidity range and pollution concentration rat...

Страница 19: ...If BC measurements are proportionally lower than the reference value then it is also possible but less likely that the ObservAir is leaking Given these potential error modes it is important to valida...

Страница 20: ...38 ObservAir Operating Manual Figure 14 Hard reset using the magnetic cover...

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