infrared industries IR-8400D, Руководство оператора

Страница: 23 / 37

22
Calibration and Operation
G E N E R A L O P E R A T I O N
In addition to the Power Indicator, there are four soft keys on the IR-8400D Gas Analyzer. These keys
allow to you to select actions and change the display accordingly. Each key corresponds to a select
position on the screen. When you change screens, the key designators will change to indicate the function
of that key.
M E A S U R I N G G A S E S
You can begin measuring gas concentrations once sample supply line has been connected to the ¼ inch
Sample Inlet Fitting located on the analyzer. By rotating the gas selector valve located on your sampling
conditioner you can select your sample gas, cal gas, and zero gas, to flow to your analyzer. Once you have
selected your desired gas then allow a few seconds for the gases to reach the analyzer. While the
MEASURE / PUMP is on, you can hold or freeze the display values by pressing the corresponding Soft Key.
C A L I B R A T I O N
The calibration of the analyzer is straightforward and easily accomplished. It does require a cylinder of
compressed nitrogen for zeroing the instrument. Clean, dry air may be used as an alternative to nitrogen.
Spanning of the instrument requires a cylinder of certified compressed calibration gas with a nitrogen
balance. It is highly recommended that a range of calibration gas near the full-scale value of the
instrument be utilized. For example, if the instrument is rated for a 0-50% measurement, the calibration
gas range for spanning the instrument should be between 40 and 50%.
After sufficient warm-up, turn the gas selector to
ZERO on the conditioning unit and allow the zero gas to
flow through the analyzer for 1 minute prior to entering the calibration process. To initiate the
calibration process, press the MENU key. Once you have entered the MENU field, press the DOWN key
until CALIBRATION is highlighted. Select this field by pressing ENTER once this field is highlighted.
When calibration is selected, the instrument will zero itself. Make sure the gas selector on the
conditioning unit is still set to zero and zero gas is running through the instrument at this time.
Once the analyzer has zeroed, the display will prompt you to ENTER TAG VALUES . The tag values are the
concentration listed on your calibration gas bottles. Enter the values using the corresponding soft keys.
The
GAS key selects the desired gas to be set. This is only used if the analyzer is configured to measure
more than one gas. The NEXT key moves the highlighted curser from right to left allowing you to select
the digit or numeral to be adjusted. The + key will allow you to scroll through the selected numerical