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 35
for details on accessing RS-232 / RS-485 output.)
Standard Voltage (0-5 Vdc) Output Signal
MC-Series flow controllers equipped with a 0-5 Vdc (optional 0-10 Vdc) will
have this output signal available on Pin 6. This output is generally available in
addition to other optionally ordered outputs. This voltage is usually in the range
of 0.010 Vdc for zero flow and 5.0 Vdc for full-scale flow. The output voltage is
linear over the entire range. Ground for this signal is common on Pin 8.
Optional 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 Calibration 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 flow and 10.0 Vdc for full-scale flow. The output voltage is
linear over the entire range. Ground for this signal is common on Pin 8.
Optional 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 Calibration Data Sheet that shipped with your
controller to determine which output signals were ordered.) The current signal
is 4 mA at 0 flow and 20 mA at the controller’s full scale flow. The output
current is linear over the entire range. Ground for this signal is common on Pin
8. (Current output units require 15-30Vdc power.)
Optional 2nd Analog Output Signal
You may specify an optional 2nd analog output on Pin 2 at time of order. (See
the Calibration 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
optional output, a controller could output the mass flow 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 optional six pin
industrial connector, please contact Alicat.
CAUTION! Do not connect this device to “loop powered’”
systems, as this will destroy portions of the circuitry and void
the warranty. If you must interface with existing loop powered
systems, always use a signal isolator and a separate power supply.
