Max Machinery 220, 221 and 222 FLOW METERS - Manual (Page 2)

Page 2 220-000-350 © 2004 Max Machinery, Inc.
Do’s & Don’ts, General Description
D O ’ S & D ON ’ TS :
DO: Read entire manual before installation. If you need further information, contact
MAX and ask for Flow Meter Technical Service.
DO: Install proper filtration immediately upstream of the flow meter.
DO: Install bypass plumbing around the flow meter. Use the bypass during start-up
while flushing the system to (1) remove dirt by filtration and (2) bleed air and
vapor from the system. Open the meter valves slowly on start-up to avoid over-
speeding the meter with entrapped air. The bypass allows removal of the meter
for service without disabling the system.
DO: Be very careful to keep all parts clean during installation or teardown. A little
dirt on a fitting or in a line (from the floor, bench, etc.) looks like a truckload
on a microscopic level. Any dirt introduced into the system between the filter
and meter will not be filtered out.
DON’T: Run water or aqueous solutions not approved by MAX through your flow meter
because of internal galling.
DON’T: Steam clean the meter (bypass or remove the meter if necessary).
DON’T: Blow down the meter with compressed air, gas, etc., because it will overspeed
and possibly damage the meter.
DON’T: Turn on the pump in a system filled with material which is a solid at room tem-
perature until the material has been melted completely. Use a bypass around the
meter during start up.
DON’T: Apply excessive differential pressure across meter (see pressure drop curve safe
zone) as it will cause internal parts to fail.
DON’T: Over pressurize the meter. Please refer to specifications for maximum operat-
ing pressure.
DON’T: Exceed the maximum flow rates specified (see performance curves) as it will
cause internal parts to fail.
G
ENERAL
D
ESCRIPTION
:
MAX 220, 221 and 222 Series are positive displacement, high-pressure, gear type flow
meters, similar in design to a conventional hydraulic motor. The flow of fluid through the
meter turns a set of gears which drive a precision transmitter through a magnetic coupling.
This generates an analog or pulse signal proportional to the volumetric flow rate.
The flow range and pressure drop through the 220 Series Flow Meter depend upon the viscos-
ity of the fluid to be metered. Normally, these flow meters are utilized on liquids having vis-
cosities in excess of those recommended for turbine or variable area (rotameter) flow meter.
Discontinued