Capacity Adjustment
M
etering pumps allow the user to vary capacity as the process requires. All Milton Roy
metering pumps permit adjustment whether the pump is running or not.
With the exception of the Centrac (see Centrac drive), Milton Roy pumps are supplied with a manual
micrometer for performing manual capacity adjustments. Depending on the type of drive mechanism and the application requirements, one of several capacity adjustment options can be supplied.
Manual Micrometer
The manual micrometer can be used to adjust the metering pump's capacity anywhere between 0 and 100%. While not directly propor-
tional to flow, this calibrated adjust-
ment can be used to accurately set pump capacity based on the pump performance curve within + 1.0%over the turndown ratio.
ManualMicrometer Option Available for: mRoy A & B, MaxRoy, Milroyal B & CThe Milton Roy Electronic Actuator responds to electronic process signals or remote manual adjust- ments. In addition, a local handwheel is provided to permit manual adjustments when unpowered.Milton Roy's electronic actuator is different from electric actuators in that it utilizes electroniclimits. It is built around
stepper motor technology, which allows it to travel precisely to position without overshoot or hunting.This design also provides superior operating characteristics such as:• 100% duty cycle•+ 0.5% position accuracy or better• low maintenanceRemote control stations are available for local/remote selection and manual capacity adjustment.Specifications:
• NEMA 4 (Explosion proofavailable)• 4-20 mA input signalstandard• Direct or reverse acting • 1-5 VDC stroke position output signal• Single phase 50/60 cycle 115 VAC
Electronic Actuator on mRoy A Option Available for: mRoy A & B, Milroyal B & C
Automatic systems that supply a pneumatic process signal benefit from the Milton Roy pneumatic actuator. A separate air control panel is available for remote control and auto/
manual switching.Specifications:
• 3-15 or 3-27 psi pneumatic signal• Direct or reverse acting
• Requires 60 psi supply air pressure
Pneumatic Actuator 14