Armstrong Monitoring Corporation AMC-310 Gebruiksaanwijzing - Pagina 13
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5 Field Adjustments
This section describes the features that can be field configured and the procedures to make
these changes.
5.1 Analog Output Range Adjustment
This section refers to advanced features of the Model 310.
2000 ppm users need not perform this adjustment.
The Model 310 ships from the factory set for an analog output range of 0 to 2000 ppm. This
range can be changed to any sub-range between 0 and 5000 ppm by changing two parameters:
The low output threshold is the concentration at which the analog output will begin to
rise. The factory default low output threshold value is 0.
The high output threshold is the concentration at which the analog output reaches its
maximum value. The factory default high output threshold value is 2000.
For example, a particular application may require the analog output to remain at 0V or 4.0 mA
until the gas concentration reaches 500 ppm, then reach 10V or 20 mA at a concentration of
1000 ppm. In this example the analog output would scale across this 500 ppm sub-range so
that the analog output would be at half scale (5V or 12 mA) at 750 ppm.
To change the analog output range use the following procedure:
1. Note whether the shorting block at jumper JP5 is covering both pins or only a single pin,
then borrow the shorting block and slide it over the two pins of jumper JP4 (see Figure 2
on page 8). The display (if present) will show 'SEL'.
2. The display (if present) will show 'SEL'. Momentarily closing a jumper selects which
value to change. If the wrong jumper is selected simply open JP4 to restart the unit and
begin again.
3. Select the low output threshold by momentarily closing JP1. If the display is present it
will show the current low display threshold. If there is no display the value can be
displayed using a meter connected to the analog output. In this calibration mode the
analog output is 10,000 ppm at full scale (i.e. 10.0 volts or 20.0 mA). If the voltage
output is selected, this scaling corresponds to 1 ppm per millivolt or 1000 ppm per volt.
4. Use the 'UP' and 'DOWN' buttons to adjust the low output threshold to the desired value.
In the example this would be set to 500.
5. Remove the shorting block from JP4 to save the value; the unit will reset itself.
6. Reconnect JP4. The display (if present) will show 'SEL'. Select the high output
threshold by momentarily closing JP2. If present, the display will show the high output
threshold. If there is no display use a volt meter as described in step 3.
AMC-310 AirSense Infrared CO
Analyzer
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