3-O&M_Settings_r1r Section 3Page 8
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LLIMIT is applied to both directions (i.e. ±) when transmitters with -B probes are configured for bi-
directional airflow (DIRECTION=BI). LLIMIT is not supported when transmitters are configured for
pressure (DPCONVERT=YES).
Use on outdoor air intakes to eliminate false airflow readings that may occur from transient wind gusts
when the intake damper is closed. The low limit airflow cutoff does not affect airflow accuracy or
modify any field adjustment coefficients.
3.3.7. Area [AREA]
The area used to convert the average velocity to volumetric airflow when CFM [L/s] is selected for the display
and/or airflow output. The area parameter represents the total area of the measurement location.
[Menu path: SETTINGS >↓ GENERAL >↓ AREA]
Default and Optional Settings: See specific probe type
Conversion of the velocity to volumetric airflow requires that the proper area of the measurement
location is used.
Record the area stored in the transmitter if the default analog airflow output signal units of measure
for velocity is maintained and the analog output signal for velocity is used by the B.A.S. The area is
used to determine the full-scale reading used by the B.A.S.
3.3.7.1. -P AND -T PROBE TYPES
Default: Area based on order size
Optional Settings: 0.00 to 9999.99 (sq. ft) [0.000 to 999.999 (sq. m)]
The -P and -T probe types have the area stored in a serial memory chip located in the cable plug of each
sensor probe. The area is automatically transferred to the non-volatile memory of the transmitter at initial
power-up based on order size. The area is printed on each hang tag connected near the terminal plug of
each sensor probe.
If the transmitter is configured for two locations, parameters for AREA1 and AREA2 will be displayed
in lieu of AREA.
Verify that the size and area on the hang tag match the actual area where the probes are installed. If
the actual area is different, modify the area parameter and record the new size and area.
3.3.7.2. -U PROBE TYPES
Default: {Null}
Optional Settings: 0.00 to 9999.99 (sq. ft) [0.000 to 999.999 (sq. m)]
The -U probe type area(s) can be entered manually or by using the AREA WIZARD.
If the transmitter is configured for two locations, parameters for AREA1 and AREA2 will be displayed
in lieu of AREA.
Probe area(s) can be modified directly through SETTINGS or by using the AREA WIZARD.
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