Hale CAFS Attack - Manual (Page 81)

EZ-View ® Flow Meter and EZ-View ® Flow Alert Flow Meter
Installation & Maintenance Instructions
Page 11
VI. MAINTENANCE
EZ-View Flow Meters are designed to provide many
years of service with little or no maintenance require-
ments. Periodic cleaning may be required.
• Clean the outside of the flow meter with denatured
alcohol or mild detergent and warm water.
• Should the inside of the flow meter become
stained, it can be disassembled for cleaning.
• Should the flow meter become jammed with partic-
ulate, the meter will require disassembly as
described below. The piston assembly should be
pushed out from the inlet side to the outlet side.
Clean the internal components and reassemble.
Disassembly
NOTE: Models with a 1" body-it is necessary to remove
the spring retaining clip (located at the flow meter out-
let port).
NOTE: Models with a 2" body can be serviced by
removing the two end fittings, then sliding the metering
pin out from the inlet, and removing the piston and
spring from the outlet.
1. Measure the insertion depth of the retaining ring
into the flow meter body with a caliper or other
measuring device.
2. Carefully remove the retaining clip with a small, flat-
blade screwdriver.
3. Remove the spring and piston assembly.
4. Clean the inside of the flow meter body and piston
assembly with denatured alcohol or mild detergent
and water.
5. Reassemble the meter in reverse order of disas-
sembly. Install the retaining ring to the depth meas-
ured in step 1. Use a deep socket of approximate-
ly 0.9" diameter and hand pressure to install the
retaining ring.
VII. APPENDIX
Fluid Correction – Liquid
S
TANDARD
F
LOW
S
CALES
Standard liquid flow scales are calibrated in GPM
(Gallons Per Minute) and LPM (Liters Per Minute) at
0.876 specific gravity for petroleum based fluids, and
1.0 specific gravity for water and water based fluids.
For field conversion of the standard scale to other flu-
ids, see Density Effect below.
S PECIAL F LOW S CALES
Special scales are available for liquids and gases in
any measurement unit, and other fluid viscosities
and/or specific gravities.
V ISCOSITY E FFECT (SUS/ C S T )
The design utilizes a precision machined, sharp-edged
orifice and biasing calibration spring that assures oper-
ating stability and accuracy over the wide viscosity
range common to many fluids. Generally, high flow
models of each meter size provide good accuracy over
a viscosity range of 40 to 500 SUS (4.2 to 108 cSt).
D
ENSITY
E
FFECT
(
SPECIFIC GRAVITY
)
Any fluid density change from stated standards has a
proportional effect on meter accuracy. Special scales
can be supplied if actual specific gravity decreases
accuracy beyond application limits. Corrections for
more or less dense fluids can be made to standard
scales using the following correction factor:
for water/water-based meters
for petroleum-based meters.
Fluid Correction – Gases
C OMPRESSIBILITY OF G ASES
Since gases are significantly compressible, their densi-
ty varies with pressure and temperature. Use tables 1
& 2 of conversion chart on page 11 to convert “indicat-
ed” scfm flow rates to “actual” scfm flow rates for your
application.
E FFECTS OF S PECIFIC G RAVITY
Standard scales are calibrated for air with a specific
gravity of 1.0. Use table 3 of the conversion chart on
page 12 to calculate “actual” scfm flow rates of gases
with specific gravity other than 1.0.
1.0
Specific Gravity
0.876
Specific Gravity