Armor-Flo 3700

Flow Measurement:

Air|Gases|Oil|Opaque liquids|Transparent liquids|Vacuum|Water

Product Datasheet

The 3700 Series meter measures the flow rate of liquid, gas or steam in vertical or horizontal pipelines. In addition, it provides flow proportional signal outputs as well as switch options in an electrical enclosure appropriate for use in Class 1, Division 1, Groups C & D areas. Even without power, the flow rate indicator functions. Features UL Listed enclosure. Low pressure loss. Install in horizontal or vertical pipe systems. Local flow rate indicator operates without power. Direct reading, each instrument is individually calibrated for the operating conditions specified. Available with signal and switch options.

Several signal output options are available:

  • 4-20 mA two wire loop powered transmitter.
  • 4-20 mA transmitter with two adjustable set points.
  • Low flow limit switch. Adjustable 20-50% of full scale. SPDT contacts rated 0.25 A @ 120V ac/1.5 A @ 24V dc.
  • High flow limit switch. Adjustable 50-90% of full scale. SPDT contacts rated 0.25 A @ 120V ac/1.5 A @ 24V dc.
  • Low and high flow limit switches. There must be a 30% of full scale differential between low and high switch settings. SPDT contact rated 0.25 A @ 120V ac/ 1.5 A @ 24V dc.

  • UL Listed enclosure.
  • Low pressure loss.
  • Install in horizontal or vertical pipe systems.
  • Local flow rate indicator operates without power.
  • Direct reading, each instrument is individually calibrated for the operating conditions specified.
  • Available with signal and switch options.

flex-flo-principal-operationsThe Armor-Flo™ body housing has a variable internal volume which enlarges from the inlet to the outlet. The primary sensor is a tempered alloy vane with one end affixed to the apex of the meter housing. As the flow rate changes, the vane is flexed in direct proportion. A Teflon® encapsulated magnet links the vane position with the pointer in the indicator housing and the signal output/switch circuit. All adjustments and electrical connections are accessible from the front of the meter housing.

The 1⁄2″, 3⁄4″ and 1″ connections typically have female threaded ends. Sizes 1 1⁄4″ through 6″ utilize an integral bypass housing permitting larger connection sizes in the format of a spool
with a consistent 12″ end to end dimension. In addition, it permits a wide variety of connection types which include threaded, flanged, grooved-ends and tri-clamp.

armor-flo-principal-operation2

Agency approval:
UL listed enclosure for metering equipment:

  • Class l Groups C & D
  • Class ll Groups E, F & G

Transmitter Supply Voltage: 20-30V dc

Transmitter Supply Current: 50 mA

Accuracy: ± 2% Full Scale

Repeatability: ± 1% Full Scale

Temperature Limits:

  • 0 to 85°C (32 to 185° F) with transmitter
  • -23 to 121° C (-10 to 250° F) with buna-n o-ring
  • -23 to 204° C (-1- to 400° F) with limit switches and Viton® or ethylene propylene o-ring.

Materials of Construction:
Housing: 316 stainless steel
Shunt: 316 stainless steel or carbon steel
Vane: Cobalt/chromium/nickel alloy
Window: Tempered glass O-ring: Buna-n, ethylene propylene, Viton® or perfluoroelastomer

Piping Connections:

  • 1/2” to 1″ NPT female (400 psig)
  • 1 1/4” to 4″ NPT male (200 or 400 psig)
  • 1/2” to 3″ Tri-clamp (200 psig)
  • 1 1/4” to 6″ Grooved (200 psig)
  • 1 1/4” to 6″ Beveled (200 psig)
  • 1/2” to 8″ 150# RF/FF ANSI carbon stl flanges (200 psig)
  • 1/2” to 8″ 300# RF/FF ANSI carbon stl flanges (400 psig)
  • 1/2” to 6″ 150# RF/FF ANSI stainless stl flanges (200 psig)
  • 1/2” to 6″ 300# RF ANSI stainless stl flanges (400 psig)
  • 15 to 25 mm, DIN 2999/BS21 ISO R7 threaded female (27.6 barg)
  • 15 to 150 mm, DIN PN 16 stainless stl or carbon stl flanges(13.8 barg)

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