34
Teledyne API Model 480M O
3
Monitor User Manual
09420A DCN8343
5.2.3.4. F
LOW
C
ALIBRATION
The flow calibration allows the instrument to calibrate its internal flowmeter
reading. This should be done with a calibrated flowmeter connected to the sample
inlet of the monitor.
In the Diag>Cal>Flow Cal menu, use the buttons under the Up/Down arrow fields
to set the Flow Cal target (the actual flow as measured at the sample inlet) and press
the Enter button; then press the button under the Execute cal field to perform the
flow calibration or press the Back button to abort back to the start.
If the calibration is successful, the flow display on the Default Screen should match
the Flow Cal target. If the calibration cannot be performed, a Cal Status Failed
message will be displayed, and you will need to return to the start of the Flow Cal
menu.
If the Cal Status Failed message occurs, it means the Flow Cal cannot be performed
because it would result in an out of range flow slope value for the monitor. This
means that either the flow sensor in the monitor is malfunctioning, causing improper
readings, or the actual flow is different than the target value being entered.
5.2.4. SETUP MENU
The Setup menu displays specific information related to the instrument’s
configuration and allows the user to setup details and change variables (Vars).
5.2.4.1. S
ETUP
>V
ARS
M
ENU
The VARS menu allows viewing and editing of various global setup variables that
effect how the 480M operates. These variables are stored in the instrument’s non-
volatile memory. Table 5-4 lists these variables and their function.
Table 5-4. VARS List
VAR
DESCRIPTION
Default Value
Range
MANUAL MODE T
[Not applicable in this model]
FLOW SLOPE
Slope value for flow calibration.
(value determined during calibration)
FLOW SET POINT
Sample flow set point.
800 cc/min
BC_FILTER_SIZE
Boxcar filter length for concentration
filter. Increasing the size of the filter
will smooth out the concentration
readings but will also increase the
response time
10
1-30
DWELL
[Not applicable in this model]
REF GAIN
Gain applied for zero calibration.
1
FAILSAFE OPERATION
Relays and digital outputs operate in
fail safe operation. Outputs are
energized in normal operation and de-
energized in fault
OFF
ON/OFF
AZERO INTERVAL
Interval at which zero calibration is
performed. (minutes)
6
3-1440
