Variable Area Flowmeters

In-Line Liquid Flow Rate Monitors
(For 1/4 To 2 Inch Pipe Sizes)

Engineering Specifications
The in-line flow rate monitor shall:

• use the variable annular orifice technique with compression spring recovery.
• not require inlet or outlet straight plumbing, or require vertical pipe mounting.
• have a measuring accuracy of +/-2.5% of full scale in the center third of the measuring range, and +/-4% of full scale accuracy over the entire flow measuring range.
• have a stainless steel sharp-edged orifice.
• have a weather-tight external construction

• Three Materials of Construction:
Select from aluminum, brass or stainless steel.

• Flexible Mounting Requirements:
Allows the designer to mount the monitor in any orientation; horizontal, vertical or upside down.

• Superior Exterior Design:
Weather-tight for use outdoors and/or on systems where washdowns are required.

• Good Viscosity Stability:
A thin (0.03"), sharp-edged, orifice provides excellent stability of readings to a minimum of 500 SUS.

• Rugged and Reliable:
Designed as a hydraulic service tool, this monitor will provide years of maintenance free performance.

• High Pressure Operation:
The magnetically coupled follower allows operation to 6000 PSIG and use with opaque liquids

• Twenty-three Different Ports Available. Standard selection of NPT, SAE and BSP permits system design versatility.

• Reverse Flow Capability:
An option not found in most rotameters and other variable area meters.

Materials of Construction: Wetted Components

	Aluminum	Brass	Stainless Steel
High-pressure casing, end ports and tapered shaft	Aluminum	Brass	#304 Stainless Steel
Seals	Buna-N (STD), EPR and Viton® or Kalrez®	Buna-N (STD), EPR and Viton® or Kalrez®	Viton® with Teflon® backup, Buna-N, EPR or Kalrez®
Transfer Magnet	Teflon® coated Alnico	Teflon® coated Alnico	Teflon® coated Alnico
Floating Orifice Disk	Stainless Steel	Stainless Steel	Stainless Steel
All other internal parts	Stainless Steel	Stainless Steel	Stainless Steel

Materials of Construction: Non-Wetted Components

	Aluminum	Brass	Stainless Steel
Window Tube	Polycarbonate (STD), Pyrex	Polycarbonate (STD), Pyrex	Polycarbonate (STD), Pyrex
Window Seals	Rubber (STD), Teflon®	Rubber (STD), Teflon®	Rubber (STD), Teflon®

Mechanical

	Series 3	Series 4	Series 5	Series 5
A	1-7/8" (48mm)	2-3/8" (60mm)	3-1/2" (90mm)	3-1/2" (90mm)
B	6-9/16" (167mm)	7-5/32" (182mm)	10-1/8" (258mm)	12-5/8" (322mm)
Port SIZES	NPTF:1/4",3/8",1/2" SAE: #6,#8,#10 BSP: 3/8",1/2"	NPTF:3/4",1" SAE:#12,#16 BSP: 3/4",1"	NPTF:1-1/4",1-1/2" SAE: #20, #24 BSP: 1-1/4", 1-1/2"	NPTF: 2" SAE: #32 BSP: 2"

Performance

Accuracy:	±4% of full scale over full scale 2.5% of full scale in the center 1/3 of scale
Repeatability:	±1% of full scale
Pressure differential:	< 30 PSIG, consult meter data sheets for exact specifications
Maximum Temperature:	Std: 240F (115C); Optional: 400F (204C) and 600F (315C)
Maximum Pressure:	Aluminum and Brass meters: 3500 PSIG (240 Bar) Stainless Steel meters: 6000 PSIG (410 Bar)
Flow range:	0.05-150 GPM (0.2-560 LPM)