EC9830 CO ANALYZER OPERATION MANUAL
2-40 98307600 Rev. C-1
Certain precautions must be taken when over-ranging is enabled to ensure that
pollutant concentration measurements are reported correctly. When a data
acquisition system must interface with the analog output of the instrument, some
means must be provided to indicate which range is in effect during all
measurements. The user should monitor pin 7 on the 50-pin I/O connector, which
is an open collector output indicating analog output #1 is in over-range.
2.6.3 Analog Output Calibration Procedure
This procedure is appropriate for connecting the EC9830 analyzer to a strip cart
recorder, Data logger (DAS) or to a Digital voltmeter (DVM).
1. Enter the INTERFACE MENU and choose ANALOG OUTPUT MENU.
2. Select RANGE and enter the desired range by selecting the appropriate digits.
Press <Enter> to confirm your choice.
3. Set the output type according to the termination selected for the discrete I/O
connector. The choice will be either CURRENT or VOLTAGE.
If current output is desired and the 50-pin board is installed, set the selection
jumper to CURRENT and de-select all voltage ranges. If current output is
desired and the 50-pin board is not installed, no hardware change is required.
If voltage output is desired and the 50-pin board is installed, set the selection
jumper to VOLTAGE. If voltage output is desired and the 50-pin board is not
installed, an external termination resistor is required. This resistor must be
50 ohms per full scale voltage desired (50 ohms = 1 volt full scale; 500 ohms
= 10 volts full scale, etc).
4. If voltage output type was selected, choose the desired OFFSET and press
<Enter>. If current output type was selected, choose the desired output range
and press <Enter>.
5. Select ZERO ADJUST and adjust the analog output to the selected offset
position for zero concentration (i.e., if 10% offset is selected, the recorder pen
or DAS should be at 10% of full scale). To make the adjustment, watch the
recorder paper or DAS while you increment or decrement the zero adjustment
correction factor that is displayed. Press <Enter> to confirm your setting.
6. Select FULL SCALE and adjust the analog output to 100% on the recorder
paper or DAS. To make this adjustment, watch the recorder paper or DAS
while you increment or decrement the full scale correction factor that is
displayed. Press <Enter> to confirm your setting.
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