76 microAeth
®
MA Series MA200, MA300, MA350 Operating Manual microAeth
®
MA Series MA200, MA300, MA350 Operating Manual 77
AethLabsAethLabs
7.3.4. Flow Calibration Kit Setup
The only way to perform a ow calibration of the MA200, MA300, and MA350 is to use a microAeth MA
Series Flow Calibration Kit provided by AethLabs.
It is recommended that all microAeth MA Series Flow Calibration Kits use the provided low backpressure
inline disc lter on the inlet of the external owmeter to keep the external owmeter clean and to keep the
microAeth sampling lter clean during ow calibration. An inline lter isn't required but is recommended
especially if a ow calibration is being completed outdoors or in a dirty environment.
Flow Connections: The inlet port of the microAeth MA Series instrument must be connected to the
outlet port of the external owmeter of the microAeth MA Series Flow Calibration Kit. The arrow on
the front of the external owmeter shows the air ow direction with the point of the arrow being the outlet
port and the opposite being the inlet port. The inlet port of the external owmeter should be connected to
the low backpressure inline disc lter.
Communication Connections: The microAeth MA Series Flow Kit communication cable must be connected
to the microAeth serial port and the external owmeter mini-din 8 port.
Power Connections: The microAeth should be connected to an external power source through the barrel
jack port labeled 'DC IN (5V)'. The external owmeter must be connected to an external power source
through the barrel jack.
NOTE: The microAeth internal battery should be fully charged (recommended battery remaining of at
least 80%).
External Flowmeter Settings: The microAeth MA Series instruments will automatically set all settings on the
external owmeter at the start of the ow calibration process. It is not recommended to change the settings
of the external owmeter. The required settings of the external owmeter for the ow calibration process are
as follows:
microAeth MA Series Flow Calibration Kit External Flowmeter
Setting Value
Communication Baud Rate: 57600
Unit ID: A
Gas: Air
Volumetric Flow Units: milliliters per minute (ml/m)
Mass Flow Units: milliliters per minute (Sml/m)
Flow Averaging: 255
Pressure Averaging: 255
Standard Temperature: 25.00 °C
Standard Pressure: 14.70 PSIA
Normal Temperature: 0.00 °C
Normal Pressure: 14.70 PSIA
7.3.5. Flow Calibration Procedure
The on-board user interface on the front of the microAeth can be used to start the automatic ow
calibration process. Please note that the ow calibration must calibrate two owmeters and therefore similar
information may be displayed on screen during the calibration of owmeter one and two.
IMPORTANT: Before starting the automatic ow calibration process, the lter tape cartridge must
be at a new clean lter sampling location. The microAeth should be plugged into an external power
source and its internal battery should be fully charged (recommended battery remaining of at least
80%). The only way to perform a ow calibration on the MA200, MA300, and MA350 is to use a
microAeth MA Series Flow Calibration Kit provided by AethLabs.
1) The microAeth must be at a new clean lter sampling location for the ow calibration.
2) If the microAeth is not already at a new clean lter sampling location, use the left and right buttons to
scroll through the top level menu options to the ‘Advance Tape’ option. Otherwise skip to step 4.
3) Press the center button to select the ‘Advance Tape’ option. The microAeth will advance the lter tape
cartridge to a new clean lter sampling location.
4) Plug in the microAeth to an external power source through the barrel jack port.
5) Plug in the MA Series Flow Calibration Kit owmeter to an external power source. Make sure the
owmeter is turned on.
6) Connect the MA Series Flow Calibration Kit communication cable to the microAeth serial port and the
owmeter mini-din 8 port.
7) Connect the outlet port of the MA Series Flow Calibration Kit owmeter to the inlet port of the microAeth.
8) Make sure that all connections are tight and sealed so that no leaks are present.
9) Use the left and right buttons of the microAeth to scroll through the top level menu options to the
‘Calibrate Flow’ option.
10) Press the center button of the microAeth to select the ‘Calibrate Flow’ option. The screen will display
‘FLOW CALIBRATE Switch to CAL CABLE. Press any button.’
11) Press any button to start the automatic ow calibration of the microAeth.
12) The microAeth will check ow and communications.
13) The screen will display ‘Highest Flow’
14) If there is a communications issue, the screen will display ‘NO COMMS DETECTED'.The screen will
then display ‘FLOWCAL - NO COMMS Switch to REG CABLE Press any button’. Press any button to return
to the top level menu and return to step 3.
15) If there is a ow issue, the screen will display ‘NO FLOW DETECTED’. The screen will then display
‘FLOWCAL - NO FLOW Switch to REG CABLE Press any button’. Press any button to return to the top level
menu and return to step 3.
16) If there are no issues, the screen will display the max ow that can be reached and will then begin the
ow calibration.
17) To cancel the ow calibration at any point, press the center button. The screen will quickly display ‘Flow
Cal Stopping'. The screen will then display 'FLOWCAL - CANCEL Switch to REG CABLE Press any button’.
Press any button to return to the top level menu.
18) When the automatic ow calibration is complete, the screen will display ‘FLOWCAL - OK xx/xx Switch
to REG CABLE Press any button’ Press any button to return to the top level menu.
19) Disconnect the MA Series Flow Calibration Kit communication cable from the microAeth.
20) Disconnect the MA Series Flow Calibration Kit owmeter from the inlet port of the microAeth.
21) Check the microAeth ow calibration table to verify that a good calibration was completed. Not every
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