36
Teledyne API Model 480L O
3
Monitor User Manual
09419A DCN8342
5.2.4.2
SETUP-VARS
M
ENU
The VARS menu allows viewing and editing of various global setup variables
(stored in the instrument’s non-volatile memory) that affect how the 480L operates.
Table 5-5 lists and describes these variables.
Table 5-5. VARS List and Descriptions
VAR
Description
Default
Value
Range
MANUAL
MODE T
Enables/disables the Manual mode timeout feature. See
Section 5.2.4.3 for more detail.
ON
ON, OFF
FLOW
SLOPE
Slope value for flow calibration.
(changes with each
calibration)
FLOW SET
POINT
Sample flow set point
800 cc/min 700-900cc/min
PRESSURE
SLOPE
Slope value for pressure
1.0
PRESSURE
OFFSET
Offset value for pressure, internally calculated value determined during calibration.
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
FAILSAFE
OPERATION
Relays and digital outputs operate in fail safe operation.
Outputs are energized in normal operation and de-
energized during fault status
OFF
ON, OFF
STREAM
COUNT*
Specifies the number of streams available in the
instrument. Note that the hardware in the instrument must
be also configured to support the number of streams
specified.
1
1,3,6
DWELL
Amount of time before measurements resume when
switching streams so that remnant gas can be cleared
from the line of the new stream. (Section 5.2.5.1 also
describes this function).
Multi-stream units with the Sample Conditioner option
(Section 3.5.1.2), require additional dwell time to purge
the filter between stream measurements.
30.0
Seconds
45.0
Seconds
0.0 – 30.0
Seconds
0.0 – 45.0
Seconds
ANALOG
RANGE
Full-scale concentration range, used to scale the analog
output.
1.0 PPM
1.0 – 500 PPM
ANALOG HW
CONFIG
Determines if the analog output uses 4-20mA or 0-5V
output
4-20mA
4-20mA or 0-5V
O3 OFFSET Internally calculated value.
N/A
N/A
O3 SLOPE
Calibration slope value
1.000
0.8 – 1.0
USER
SLOPE
User-editable calibration slope value
1.0
0.5-1.5
USER UNITS Setting for concentration unit-of-measure
PPM
PPM, PPB, UGM
CARRIER
GAS WEIGHT
Molecular weight of carrier gas (i.e., feed gas for ozone
generator). This value is only used for the calculation of
wt% concentration units.
32 g/mol
