BAM 1020-9800 Manual Rev W.docx
Page 45
BAM 1020 sets the analog output voltage to full scale (1.000 volts) whenever any of the
enabled error types occurs. When there are no alarming conditions present, the voltage
represents the last valid concentration level. See Section 8 for external data logger setup
information.
The operator can select which errors will cause this full-scale response by enabling (1) or
disabling (0) each of the 12 error types as shown in the screen below.
SETUP ERRORS
EUMILRNFPDCT AP
000000000000 150
1 = ON, 0 = OFF
CONCENTRATION ERROR: “ERROR” TEXT
SAVE EXIT
The ERRORS Screen
Note: Some minor alarms such as E, U, R, P, or D can occur when there may be nothing
wrong with the hourly concentration value, yet these alarms are still typically enabled to set
the analog output to full-scale in order to alert the data system of their presence. In this case,
the concentration value can still be downloaded from the BAM digitally. Regardless which
error types are enabled for the analog output,
all alarms and errors are always stored in the
BAM 1020 digital alarm log and data log
, and may be viewed by downloading the data.
The following table briefly describes which type of alarm each letter represents. Complete
error and alarm descriptions are found in Section 7.2.
Code
Error/Alarm Type
Basic Description
E
External Reset
Failed BAM clock reset.
U
Telemetry Fault
External data logger fault.
M
Maintenance Alarm
Entering the SETUP or TEST menus or setting Maintenance on
I
Internal CPU Error
Internal processor error, or failed data link between coarse units.
L
Power Failure
Power failure prevented sample completion.
R
Reference Membrane
Reference span membrane not extending or retracting properly.
N
Nozzle Error
Nozzle motor malfunction.
F
Flow Error
Flow system failure, or temperature/pressure sensor failure.
P
Pressure Drop Alarm
Tape blocked by excessive dust loading.
D
Deviant Span Density
Span check did not match the expected ABS value.
C
Count Error
Beta particle detector error.
T
Tape System Error
Broken filter tape, or an error in the tape control system.
The following settings related to the alarms are located in the SETUP > ERRORS screen:
AP
Pressure-drop limit. This is the maximum amount of increase in pressure drop which is
allowed to occur across the filter tape due to heavy
dust loading, before the “P” alarm
will be generated. Setting the AP higher will allow more dust to accumulate before the
sample is terminated, but may cause flow regulation problems. See the pressure-drop
alarm description in Section 7.2. The default setting of
150
mm Hg is correct for most
applications using the standard Medo or Gast pumps. Larger pumps can
accommodate a higher AP setting and higher dust loads while still being able to
regulate the sample flow. The setting range is 0-500 mm Hg
.
