infrared industries FGA, Руководство оператора

Страница: 22 / 58

21
F I E L D C A L I B R A T I O N W I T H C E R T I F I E D C A L G A S
The analyzer does not need regular field calibration. However, field calibration can be performed when there is reason
to believe that the factory calibration is no longer producing accurate analysis results.
The gas analyzer does not require gas calibration very often. Therefore the gas calibration tanks are normally closed. It
will be assumed in the calibration process described below that the calibration gas is turned off at the tank.
CAUTION: WHEN CALIBRATING OXYGEN WITH CAL GAS (other than ambient air), THE
INTERVALS BETWEEN CALIBRATIONS FOR THE OXYGEN SENSOR WILL BE
CONSIDERABLY FURTHER APART - DAYS, WEEKS, OR MONTHS DEPENDING ON
HOW OFTEN THE UNIT IS GAS CALIBRATED, AS COMPARED TO THE AUTO ZERO
CYCLE PERIODS (MINUTES). BECAUSE THE ANALYZER IS INHERENTLY SPAN
STABLE, IT IS BEST IF THE OXYGEN SENSOR IS ALLOWED TO SELF CALIBRATE
AUTOMATICALLY ON AMBIENT AIR DURING THE AUTO ZERO CYCLE RATHER
THAN TO USE CAL GAS.
NOTE: The oxygen sensor and circuitry do not need calibration; they are checked
automatically during zeroing. If the sensor deteriorates to the point of needing
replacement, a Zero Failure may occur after zeroing.
To calibrate the analyzer press the Mode button [18] repeatedly until you see FIELD CAL NO appear on the screen.
Press the Up arrow button once to select YES and then press MODE. The CAL indicator [4] will be on and the
analyzer will enter a purge and zero sequence. Please wait until you see ENTR TAGS GO. Press the MODE button
[18] and begin entering the Tag values in each of the windows. For HC enter the actual propane tag value. The
Machine will automatically use the correct PEF ratio. Use the UP or DOWN arrow keys to increment or decrement
each digit and Left or Right arrows to move to individual digits. Press the MODE button [18] to advance to the next
window. Enter all zeros if do not wish to calibrate a particular gas. We recommend always entering all zeros in the O2
window. By pressing the MODE button after entering the last tag value, you will see the message: TURN CAL GAS
ON GO Make sure the Cal Gas is connected to the CAL port in the back of the unit. The CAL port is located in the
bottom right of the back panel. Turn on the calibration gas and press the MODE button. You will see the
concentrations changing on the display. Wait until all the values have stabilized; this may take a few seconds. When
the values have stabilized, press the MODE button [18]. The CAL indicator will be blinking. Do not disturb the gas
flow at this point. When the CAL indicator turns off, you will see the message: TURN CAL GAS OFF GO. Turn
off the Cal Gas, disconnect the hose from the CAL port, and press the Mode button. Within a minute the analyzer will
purge the Cal Gas and re-zero itself. The Field Calibration will then be complete.
D U A L E X H A U S T
DUAL EXHAUST is a sub mode of the MEASURE mode. In this mode the right and left exhaust measurements will
be averaged. When the MEASURE key is selected the EXH1 indicator will light. Insert the probe into the first of the
two tailpipes.
After the reading stabilizes, press the MEASURE key. This will store the first reading in memory and light the EXH2
indicator signaling the operator to move the sample probe to the second tailpipe. After this reading stabilizes, press the
MEASURE key again. At this point both EXH1 & EXH2 indicators will come on steady and the displays will show
the average of the two exhaust pipe readings.
Pressing the HOLD key at this time will toggle between the EXHAUST 1 reading, the EXHAUST 2 reading or the
average of the two exhaust readings up until the time the displays are released from this mode by pressing the
MEASURE key again. The unit will then revert back to the STANDBY mode.