Alicat MC Series Mass Flow Controller - Manual (Page 11)

11
OUTPUT SIGNALS
RS-232 / RS-485 Digital Output Signal
To use the RS-232 or RS-485 output signal, it is necessary to connect the RS-232
/ RS-485 Output Signal (Pin 5), the RS-232 / RS-485 Input Signal (Pin 3), and
Ground (Pin 8) to your computer serial port as shown on page 8. (See page 30
for details on accessing RS-232 / RS-485 output.)
Standard Voltage (0-5 Vdc) Output Signal
MC-Series fl ow controllers equipped with a 0-5 Vdc (opti onal 0-10 Vdc) will
have this output signal available on Pin 6. This output is generally available in
additi on to other opti onally ordered outputs. This voltage is usually in the range
of 0.010 Vdc for zero fl ow and 5.0 Vdc for full-scale fl ow. The output voltage is
linear over the enti re range. Ground for this signal is common on Pin 8.
Opti onal 0-10 Vdc Output Signal
If your controller was ordered with a 0-10 Vdc output signal, it will be available
on Pin 6. (See the Calibrati on Data Sheet that shipped with your controller to
determine which output signals were ordered.) This voltage is usually in the range
of 0.010 Vdc for zero fl ow and 10.0 Vdc for full-scale fl ow. The output voltage is
linear over the enti re range. Ground for this signal is common on Pin 8.
Opti onal Current (4-20 mA) Output Signal
If your controller was ordered with a 4-20 mA current output signal, it will
be available on Pin 1. (See the Calibrati on Data Sheet that shipped with your
controller to determine which output signals were ordered.) The current signal
is 4 mA at 0 fl ow and 20 mA at the controller’s full scale fl ow. The output
current is linear over the enti re range. Ground for this signal is common on Pin
8. (Current output units require 15-30Vdc power.)
Opti onal 2nd Analog Output Signal
You may specify an opti onal 2nd analog output on Pin 2 at ti me of order. (See
the Calibrati on Data Sheet that shipped with your controller to determine
which output signals were ordered.) This output may be a 0-5 Vdc, 0-10 Vdc, or
4-20 mA analog signal that can represent any measured parameter. With this
opti onal output, a controller could output the mass fl ow rate (0-5 Vdc on pin 6)
and the absolute pressure (0-5 Vdc on pin 2).
If your device is CSA/ATEX approved or equipped with the opti onal six pin
industrial connector, please contact Alicat.
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