Key Instruments FR4500 Series User Manual
Flo-rite, Series fr flowmeters flo-rite

250 Andrews Road • Trevose, PA 19053 • 800.356.7483 • 215.357.0893 • Fax: 215.357.9239
www.KeyInstruments.com • [email protected]
250 Andrews Road • Trevose, PA 19053 • 800.356.7483 • 215.357.0893 • Fax: 215.357.9239
www.KeyInstruments.com • [email protected]
Flo-Rite
™
Series FR Flowmeters
Flo-Rite
™
Series FR Flowmeters
Other Acrylic Flowmeter Products
FLOWMETERS
KEY INSTRUMENTS offers a wide variety of precision 
rotameters for use in medical, industrial, chemical, 
and laboratory applications. Over twenty years of 
experience in the manufacture of acrylic flowmeters 
enables us to provide a large assortment of standard 
styles from stock at economical prices. Our production 
and engineering processes are flexible enough to allow 
us to meet most OEM and end user requirements.
We use a primary flow standard directly traceable 
to the NIST (National Institute of Standards and 
Technology), and have implemented stringent quality 
control procedures to assure you of receiving a 
quality product that is accurate and repeatable, yet 
economical.
Key Instruments’ flowmeters have been engineered 
with built-in quality, designed for economy, and 
stocked in sufficient quantity to meet your immediate 
needs as well as your long term requirements. 
For additional information regarding current prices, 
discounts or delivery status, call Customer Service at 
1-800-356-7483.
FR In-Line Flowmeters
FR 5500 Flowmeters
Eagle Eye
®
Flowmeter Alarm
PR Series
E-Z Field Check Kits
Rev. P-025
Catalog Number Ordering Example:
FR5A53PV
ExAMPLE:
FR
5A53
P
V
Glass Flowmeter
Product Code
Model Number
From Tables D & E
Fitting Material
P = PVC (std), S = Stainless Steel (for water only)
Fitting / Valve
S = Back connections (std),
I = End connection,
V = Valve (Back Connection Only)
ORDERING INFORMATION 5 INCH SCALE
Catalog Number Ordering Example:
FR5L57SI
ExAMPLE:
FR
5L57
S
I
Glass Flowmeter
Product Code
Model Number
From Tables D & E
Fitting Material
P = PVC (std), S = Stainless Steel (for water only)
Fitting / Valve
S = Back connections (std),
I = End connection,
V = Valve (Back Connection Only)
CUSTOM FLOWMETERS
KEY INSTRUMENTS manufactures custom variable area rotatmeters, various 
electronic products, calibration kits, sight-flow indicators, flow control valves, 
and accessories as part of a complete flow instrumentation system solution. 
Our custom flowmeters are designed and manufactured to be durable, 
accurate, and suitable for measuring water, low viscosity fluids, compressed air, 
steam and more in medical, industrial, chemical, and laboratory applications.
For convenience and quick shipping, we maintain a large inventory of standard 
meters to choose from. However, for customers that require products that must 
be customized to meet specialized application requirements, we offer precision-
machined acrylic, glass, or polycarbonate flowmeters for argon, carbon dioxide, 
helium, nitrogen, nitrous oxide and/or oxygen.
