ECA 450
Operation
Instruction 0024-9400
33
5.
The statistics duration is the length of time allocated to collecting data.
Use
∧∨
keys to select desired duration; then press
ENTER
to make the
selection and display the Statistics Summary screen.
Note:
The minimum and maximum duration values are dependent on the
interval. The duration can never be less than the interval, and cannot
record more than 120 readings.
Statistics Duration
5 min
6.
The Statistics Summary screen shows both the interval and duration as
chosen in Steps 4 and 5. For example: if the interval was set to
10 seconds, and the duration set for 5 minutes, then emission data will be
collected every 10 seconds over a 5 minute period — for a total of 30
readings from which the average and standard deviation are calculated.
To change the value of either the interval or duration, press
ESC
to
redisplay the first Statistics screen and repeat Steps 3, 4 and 5.
Statistics Summary
Interval 10 sec
Duration 5 min
Press ENTER to start
7.
With the analyzer set up per Section
2.4 Performing a Combustion Test
,
press
ENTER
to begin collecting data for statistical analysis. Before data
is collected, however, the ECA 450 first waits 60 seconds to allow the
sensor readings to stabilize.
Stabilizing Sensors
START in 60 SEC
After 60 seconds as elapsed, the front panel now shows the data as it’s
being collected. Use the
∧∨
keys to scroll through the readings on the
display.
«STAT«(0010)«««NGAS«
In this example, the top line of the display shows that the analyzer is in
its statistics mode; currently taking reading #10; with natural gas as the
fuel. Observe that the reading number increments as data is being
collected at the chosen interval and stored in memory.
Tip:
Press
ESC
to abort the statistical analysis process. At this time the
Statistics mode is turned OFF and the message “Stats Interrupted” is
displayed. Press
ENTER
to return to the Combustion Test HOLD screen.