The OMEGA™ precision variable-area variable area flow meters for
air, water, and gases have up to ±2% of full scale
accuracy and 0.25% of full scale repeatability. These
units feature an easy-to-read millimeter scale and are
supplied with correlation charts for air and water. Please consult the Engineering Department for details.
The scale is fused on the metering tube in 1 mm (3⁄32")
increments, which enables a user to read the flow rate
with the highest accuracy.
The special scale design, where a vertical line runs
through the length of the scale and intersects the
horizontal scale divisions, reduces parallax and eye
fatigue, thus insuring high-accuracy readings (see
inset, next page). The front polycarbonate shield is
also curved to act as a magnifying glass, all of which
yields superior performance over other variable area flow meters with
Easy Flow Tube Replacement
The important advantage of the FL-3600 through the FL-
3900 variable area flow meters is their special locknut design, which
facilitates the installation and replacement of flow tubes in
the field for easy flow range change. The knurled locking
nut on top of the tube is backed off with a small Allen
wrench or a 1 mm (3⁄32") diameter rod, thereby releasing
the tube for replacement. The system is designed so that
the tube does not rotate while it is tightened into place.
Only 2 different standard valves are used: one for flows
up to 7000 cc/min of air, the other for higher flow rates.
Six different high-resolution valves are used; consult
Engineering for details when changing tubes.
Shielded for Pressurized Systems
These variable area flow meters, with precision-bored borosilicate
glass metering tubes, are fully shielded against
breakage. A white opaque rear shield provides a
background to aid in discerning the float position for
Panel Mounting Design
These variable area flow meters are
equipped with horizontal
ports and NPT threads for
easy panel mounting. The
ports have external threads
and are equipped with panel
retaining nuts. No additional
mounting hardware is
required. Simply drill two
holes 131 mm (5.156") apart
(center to center) for 65 mm
units, 240 mm (9.469") apart
(center to center) for 150 mm
units. Each hole should be
16 mm (5⁄8") in dia.
† All amounts shown in EUR Note: “G” suffix denotes glass float, “ST” suffix denotes 316SS float, “C” suffix denotes carboloy float, “SA” denotes sapphire float. For units without valve, add suffix “-NV” to model number 1. Minimum flow rate is 10% of the maximum rate shown. 2. For 16 turn, high resolution non-rising stem valve for 150 mm Variable Area Flow Meters, add suffix “-HRV” to model number and consult sales for pricing. For oxygen cleaning add “-02CLEAN” to model number and consult sales for pricing. Comes complete with correlation sheets for air and water, instruction sheet is on back of correlation sheets.