E8500 Instruction & Operations Manual
version 1.010
Page 33 of 45
ZERO TIME: This is the countdown time for the autozero procedure. The autozero
countdown should be at least 60 seconds. However, it need not be more than 120
seconds.
SPAN TIME: When carrying out a span calibration, you must introduce the span gas for
an appropriate amount of time before the analyzer executes the span calibration. This
setting, which is the same for all sensors, controls this time interval. The time is
indicated in seconds, but a minimum of 5 minutes of span gas feeding is required for
proper calibration of the electrochemical sensors. For span calibrating NDIR sensors 1
to 2 minutes of feed time is sufficient.
SPAN LOCKOUT: This controls access to the remaining span calibration menu
options. Span lockout prevents accidental or mistaken calibrations. Span lockout is
enabled and disabled by entering a 4-digit code.
SPAN XXXX: The remaining lines of the CALIBRATION MENU are used for carrying
out span calibrations of the CO, NO, NO2, SO2, H2S, NDIR and Stack Draft sensors.
For detailed use of these settings, please refer below.
A.
AUTOZEROING THE INSTRUMENT
When you turn the instrument on, wait two minutes to allow the analyzer to warm up
before carrying out the autozero countdown.
To start the autozero procedure, press the CALIB button and select ZERO ALL
SENSORS. Make sure that the analyzer pump is pulling in air.
At the end of the autozero period the E8500 reads the output of all gas sensors and
sets them all to zero, with the exception of the oxygen that it sets to 20.9%.
Consequently, it is very important that at the moment of "zeroing", the environment is
clean from traces of carbon monoxide or other gases.
If no error messages appear at the end of the countdown, proceed with your
measurements.
B.
SPAN CALIBRATION
You must always span calibrate the instrument every time you replace a sensor. At a
minimum, you should perform a span calibration of the instrument once every 12
months. For greater accuracy you should check the calibration of the instrument before
and after each emissions test. The parameters that require a span calibration are:
carbon monoxide, carbon dioxide, nitric oxide, nitrogen dioxide, sulfur dioxide, hydrogen
RATE THE ANALYZER, IT IS BEST TO USE ONLY SINGLE
GAS MIXTURES WITH EITHER NITROGEN OR AIR BALANCE.
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