DST ObservAir Скачать руководство пользователя страница 1

 

 

 

 

 

 

ObservAir 

Operating Manual 

 

Distributed Sensing Technologies 

 

Released:

 November 1, 2020 

Version:

 1.0 

© 2020 Distributed Sensing Technologies, LLC 

 

 

 

ObservAir

®

 Operating Manual 

Table of Contents 

1.

 

Introduction .............................................................................................. 3

 

1.1.

 

Principle of operation .................................................................................... 4

 

1.1.1.

 

Aerosol absorption photometer (Black carbon) ............................ 4

 

1.1.2.

 

Electrochemical cells (Gaseous pollutants) .................................... 6

 

1.2.

 

Environmental compensation .................................................................... 7

 

1.3.

 

Base package contents ................................................................................. 8

 

2.

 

Technical Specifications ......................................................................... 9

 

2.1.

 

General specifications ................................................................................... 9

 

2.2.

 

Measurement performance ..................................................................... 10

 

2.3.

 

Operational 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 concentration display ................ 15

 

3.2.3.

 

Sensor menu Interface ......................................................................... 15

 

3.2.4.

 

Attenuation reset ..................................................................................... 16

 

3.2.5.

 

Sensor shutdown ..................................................................................... 16

 

3.2.6.

 

Sensor alarms and errors .................................................................... 16

 

3.3.

 

Filter tab replacement ................................................................................ 17

 

3.4.

 

Battery charging ........................................................................................... 18

 

3.5.

 

Data collection from onboard SD card ............................................... 19

 

3.5.1.

 

Settings file ................................................................................................ 19

 

3.5.2.

 

Data file ....................................................................................................... 21

 

3.6.

 

Computer (serial USB) connection ....................................................... 22

 

3.6.1.

 

Connecting to Arduino Serial Monitor ............................................ 22

 

3.6.2.

 

Serial data collection ............................................................................. 23

 

3.6.3.

 

Sensor configuration: Serial commands ....................................... 23

 

3.7.

 

WiFi connection ............................................................................................. 25

 

3.8.

 

Firmware updates ........................................................................................ 26

 

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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