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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.

Ecotech A Series User Manual

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