Armstrong Monitoring Corporation AMC-310 Gebruiksaanwijzing - Pagina 11
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4.3.2 Signal Output
The Model 310 provides either a 0 – 10 volt or a 4 – 20 mA current loop output at the two
terminals of the analog output connector shown in Figure 2.
The type of analog output is determined by the setting of the analog output selector shown in
Figure 2.
The analog output of the Model 310 is completely isolated from the power supply. The common
outputs of multiple units can be connected together with no interaction regardless of power
supply hook-up. Refer to Figure 2 for Model 310 wiring connection to an AMC monitor.
4.3.3 Voltage
When the outboard and middle pins of the analog output selector are connected with the
shorting block, a voltage output appears between the two terminals marked ANALOG OUTPUT.
The output voltage increases linearly from 0 volts at the low output threshold to 10 volts at the
high output threshold. The unit is shipped from the factory with the low output threshold at 0
ppm and the high output threshold at 2000 ppm. See the Analog Output Range Adjustment
section on page 11 to change the analog output range limits.
4.3.4 Current
When the inboard and middle pins of the analog output selector are connected with the shorting
block, a current output appears between the two terminals marked ANALOG OUTPUT. The
output current increases linearly from 4 mA at the low output threshold to 20 mA at the high
output threshold. The unit is shipped from the factory with the low output threshold at 0 ppm
and the high output threshold at 2000 ppm. See the Analog Output Range Adjustment section
on page 11 to change the analog output range limits.
If the total resistance between the two terminals exceeds the specified maximum loop
resistance, the output current may be erroneously low at high concentrations.
4.4 Verifying Voltage or Current Output Connection
After the voltage or current output of the Model 310 is connected to a controller or indicator, the
following check should be performed to ensure that the connection has been properly
established and the Model 310 is transmitting the correct values:
1. Be sure that the output select jumper is set correctly for voltage or current output. If this
is not done first, the following check may produce incorrect results.
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). The display (if present) will show 'SEL'
2. Momentarily closing JP5 will set the unit to full scale output (10V or 20mA). Do not
press the buttons on the unit as this will affect the output calibration.
If the receiving device does not indicate a full scale reading after JP5 is closed, verify
that the wiring is correct.
AMC-310 AirSense Infrared CO
Analyzer
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