Alicat EPC Series Manual de instrucciones - Página 6
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Imprimir páginaOUTPUT 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, the Input Signal, and Ground to your computer
serial port as shown on page 5. (See page 7 for details on accessing RS-232 /
RS-485 output.)
Standard Voltage (0-5 Vdc) Output Signal
Controllers equipped with a 0-5 Vdc will have this output signal available. 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 3. Other output options include 0-10 Vdc, 1-5 Vdc and 4-20 mA.
EPC-SERIES SINGLE VALVE PRESSURE CONTROLLER OPERATION
Alicat Scientific EPC-Series Pressure Controllers incorporate a digital pressure
gauge with a single control valve and circuitry. The integrated PID loop measures
the pressure, compares it with the setpoint, and adjusts the valve accordingly at
1000 times per second.
The response time of the system will depend on the operating conditions and the
PID tuning of the device.
Plumbing
EPC-Series Pressure Controllers are normally intended to control the process
pressure downstream of the controller. In order for this to occur, a supply pressure
greater than the full scale pressure control range of the device, not to exceed 150
psig, should be connected to the "IN" port.
EPCD-SERIES DUAL VALVE PRESSURE CONTROLLER OPERATION
Alicat Scientific EPCD-Series Closed Volume Pressure Controllers incorporate a
digital pressure gauge with dual control valves and circuitry. The integrated PID
loop measures the pressure, compares it with the setpoint, and adjusts either the
Inlet or Exhaust valve accordingly at 1000 times per second.
The response time of the system will depend on the size of the volume being
controlled, the operating conditions, and the PID tuning of the device. The
controllers are intended for use with clean, non-corrosive gases only.
They are designed with a feed port, a process port, and an exhaust port. This
allows the controllers to raise and lower the pressure of a closed system within
the operating range of the controller without wasting gas under constant
pressure conditions.
Plumbing
EPCD-Series Dual Valve Pressure Controllers are commonly ordered with
custom port locations.
Connect your EPCD into your process via the "OUT" port of the unit. This is the
"Process" port.
Connect a supply pressure greater than the full scale pressure control range of
the device, not to exceed 150 psig, to the "IN" port.
The "VENT" port can vent to atmosphere if the application is suitable, or to a
collection network if necessary.
The pressure at the vent port should be at atmospheric pressure or below to
allow the controller to be used over its full scale range.
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