Emerson Tescom ER5K Instruction Manual page 16

Section 3: Product Description
September 2019
If feedback is lower than setpoint, the ER5000 activates the inlet valve, allowing Pilot Pressure
to flow into the actuator of the regulator. This causes the main valve of the regulator to open
up, resulting in an increase in downstream System Pressure. The ER5000 will continue to send
pilot pressure into the air actuator of the regulator until feedback and setpoint are equal. At
that point, the inlet valve closes, stabilizing the system at that pressure.
If feedback is higher than setpoint, the ER5000 activates the exhaust valve, releasing pilot
pressure from the regulator. The decrease in pilot pressure causes the main valve of the
regulator to close up and also causes the regulator vent to open, exhausting excess system
pressure (if your application uses a non-venting regulator, refer to page 36). The result is a
decrease in downstream system pressure. The ER5000 will continue to exhaust pilot pressure
until the feedback signal is equal to the setpoint. At that point, the exhaust valve closes,
stabilizing the system at that pressure. The air actuator, also known as the Ratio Actuator,
amplifies the force generated by the ER5000, allowing the pilot pressure to modulate system
pressure that may be many times greater, up to 30,000 psig / 2068 bar.
9
Inlet
Valve
ER5000
Inlet Port
Supply
Pressure
110 psig /
7.5 bar
Pilot
Pressure To
Air Actuator
Air Actuator
Vent Valve
Regulator
Inlet
Pressure
Captured Vent exhausts excess pressure
Figure 3. Typical Pressure Reducing Application (continued)
USB Connection
Exhaust
Valve
ER5000
Exhaust Port
Pressure Vents
to Atmosphere
Setpoint
Source can be either a
ER5000 Outlet Port
digital signal provided over
and Adaptor
USB or RS485, an analog
Pilot
Pressure From
onboard memory.
Air Actuator
Feedback
For optimal system
performance, an accuracy
of 0.1% or better is required.
A less accurate transducer
can be used, but doing so
will degrade the accuracy of
Main Valve
the overall system.
Regulator
Inlet
Pressure
ER5K Kits
DOPSM2095X012
PC
Section 3: Product Description