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BIOPAC Hardware | SS11LA & TSD117 | Page 3 - 7 Updated: 12.2.2013
To remove residual offset after the flow data
has been collected, select a portion of the
baseline (zero flow reading) and calculate
the mean value using the popup
measurements. Subtract this mean value
from the raw data to obtain a mean
corrected flow signal.
Now, the integral of the mean can be
calculated as shown in this graph
In this case, a 600ml-calibration syringe was
used to check the rough calibration of the
airflow transducer. The rough calibration
indicates a syringe volume of about 550ml,
so this method may only be expected to be
accurate within ±10% of the real reading.
Flow Measurement and Volume Calculation
To achieve a more exact calibration
, start with the above scaling factors and then boost or drop them slightly as
indicated by the rough calibration. In this case, if the map value correlating to 0.12 volts were boosted about 10%
to 1.10 (from 1.0 liters/sec), the resulting calibration would be fairly accurate.
See also: DA100C Calibration options.
>>>
All Instructions also apply to the older airflow transducer — model SS11L with non-removable head <<<
SS11LA To MP3X Connection
1. Make sure the BIOPAC MP3X unit is
turned OFF.
Note: Turn the MP3X power off even
if the software is running.
Note: SS11LA to MP connection instructions also apply to 2-
channel MP45 hardware.
2. The airflow transducer (SS11LA) can
be plugged into any input channel on
the MP3X.
3. After the transducer is plugged in
securely, turn the MP3X power ON.
SS11LA to MP3X connection
Rough Calibration (MP3X)
1. Pull down the MP3X menu.
2. Click Setup channels.
3. Select the Analog channel that the
SS11LA transducer is plugged into and
activate it by clicking in the Acquire,
Plot and Values boxes.
The SS11LA can be roughly calibrated without using the AFT6
calibration syringe. The SS11LA has a nominal output of 60 µV per
liter/sec, which is then scaled to account for the amplifier excitation.
For the MP3X, this is factory set to 5 Volts. Therefore:
60 V/[liter/sec] · 5 = 300V / [liter/sec].
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