BAM 1020-9800 Manual Rev W.docx
Page 43
SPAN CHECK:
This setting determines how often the BAM 1020 performs the automatic
span membrane check. If the value is set to 1 HR, the BAM measures and displays the span
each hour. If this value is set to 24 HR, then the BAM will only perform the span check once
per day during the sample hour beginning at midnight and during any sample hour following a
power failure. The resulting value will be displayed throughout the rest of the day. If this value
is set to OFF, the span check will be disabled entirely.
Note:
This setting does not appear in
any firmware before V3.7.0, where the setting is invisible and fixed at hourly.
FLOW RATE:
This sets the air flow rate for the BAM 1020, and the BAM 1020 will
continuously regulate the flow to this value during sampling. The FLOW RATE is always set
for
16.70 liters per minute
, as this is required for all PM
2.5
and PM
10
monitoring. The only
time this might be changed temporarily is if a site operator was testing the ability of the pump
and flow controller to regulate the flow at different levels for troubleshooting purposes. The
range of the setting is 10 to 20 L/min.
CONC TYPE:
This sets the way that the concentration values are reported.
The CONC
TYPE must be set to ACTUAL for all PM
2.5
monitoring, and is almost always set to STD for
PM
10
monitoring.
If set to ACTUAL, then the concentration is calculated and reported based
on the volume of the air at local ambient conditions. An ambient temperature sensor is
required. If set to STD, the concentration is calculated and reported based on the standard
values for temperature and pressure (760 mmHg and usually 25C), even if a temperature
sensor is available. See Section 5.2. Note: units with firmware prior to rev 3.0 do not have
this setting available, and the concentration reporting is determined by the FLOW TYPE
setting.
FLOW TYPE:
This setting selects the flow control scheme used by the BAM 1020. The
options are ACTUAL or STD.
Section 5.2 contains a detailed description of each of these
flow types
, and should be studied to ensure proper operation of the BAM 1020.
The FLOW TYPE should be set to ACTUAL on all BAM 1020 monitors equipped with an
external temperature sensor (BX-592, BX-596 or BX-597). FLOW TYPE should be set to
STD only if an external temperature sensor is unavailable.
Cv:
This value is a factory-set scaling slope for the internal mass flow sensor. The value of
Cv is never altered except when performing a flow calibration on old units without an
automatic flow controller. All newer units with flow controllers and ambient temperature
sensors never need to have this value altered, because the flow calibrations are done in the
TEST > FLOW screen.
Qo:
This value is the factory-set zero correction offset for the internal mass flow sensor,
and is almost always zero. Qo is usually never changed by the user except when
troubleshooting a leak check failure if the BAM flow display does not drop to 0.0 L/min when
the pump tubing is disconnected from the BAM 1020.
ABS:
The ABS value is the factory-set expected mass of the reference membrane foil used
during the automatic hourly span check. This expected value is compared to the measured
value each hour (see section 4.2).
Each unit’s ABS value is different, but is typically near
0.800 mg/cm
2
.
The ABS value is never changed by the operator unless the span
membrane foil is replaced due to damage.
