APU-XP APU-XP - Williams Pumps

APU-XP APU-XP - Williams Pumps
APU-XP
Automatic
utomatic P
Processing
rocessing U
Unit
nit
A
The APU SERIES AUTOMATIC PROCESSING UNIT is designed to
automate
pneumatic metering pumps. The APU accepts a linear 4-20 mA signal
from
a process flow meter and operates a pneumatic metering pump
to
operate proportional to the input signal.
This is accomplished by the use of a normally closed, 3-way
Economic Automation
solenoid valve connected to air or gas supply.
The APU pulses the 3-way solenoid valve which is connected to
the pneumatic pump. The solenoid is cycled “on and off” to operate
the pump. As the process signal increases or decreases, the pump cycles in direct
proportion. Thereby increasing or decreasing the amount of chemical injected.
FEATURES
• Explosion Proof
Class I, Groups B,C,D
Class II, Groups E,F,G
Class III
CENELEC: EExd IIC, IP66
• Corrosion resistant, powdercoat finish
• Provides pulse rate output proportional to a process signal
• Reduced chemical usage by operating proportional to the process flow
• Compact unit, ideal for offshore and plant installations
• Weatherproof Enclosure
NEMA 4, 7BCD, 9EFG
• Exterior mounting lugs for easy installation
PART NUMBER FOR ORDERING
APU - XP - 120 - QE - ATEX
If Required
Basic Series
Power
Supply
12 — 12VDC
24 — 24VDC
120 — 120VAC
220 — 220VAC
Solenoid Valve
QE — Quick Exhaust*
ST — Standard
NR — Not Required
*Quick Exhaust (QE) option is used when maximum number of strokes are required on larger sized pumps.
Literature #30996 7/06
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