Alicat M Series Mass Flow Meter User Manual

Page 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 22

for details on accessing RS-232 / RS-485 output.)
Standard Voltage (0-5 Vdc) Output Signal
M-Series fl ow meters 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 meter 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 meter 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 meter 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 meter

to determine which output signals were ordered.) The current signal is 4 mA at

0 fl ow and 20 mA at the meter’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 meter 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 meter 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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