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FM-1127 Series High Flow Capacity Flowmeter (direct read Air), Brass

USD $958.72

FM-1127 Series High Flow Capacity Flowmeter (direct read Air), Brass

USD $958.72
Part Number:    FM-1127 Series (Brass)
   Availability:   Ships within 48 hours from Montgomeryville, PA

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Product Description

MATHESON made in the USA



Matheson's FM-1127 Series Flowmeters are offered as a simplified solution to the problem of fluid flow indication at

higher flow capacity levels than the FM-1050 and FM-1000 Series Flowmeters. These meters are designed to withstand the physical abuse and environmental corrosion of industrial applications. The FM-1127 is available in several ranges of 127mm direct reading scales. Choose between English or Metric units.

A one-piece aluminum channel frame encloses the end blocks, fittings and glass metering element for maximum meter protection and safety. Three standard connection types are made available.

The precision tapered metering tube has integral float guides to ensure float fidelity. The scale is permanently screened on an acrylic window inset in the meter case which makes it interchangeable for economical alteration of meter applications. A float/scale correlation symbol is marked on the window to eliminate error during application changes. The reading edge of the machined float provides precision read-out delineation. Reading edge instructions are also screened on the scale window.

Valve Options
• Utility valve for those who desire control as well as indication
• No valve for those who just want indication


FM-1127 Series 
Tube No. Air (SCFM)*   Tube No. Air (SLPM)*   Tube No. Water (GPM)   Tube No. Water (LPM)
B121  0.2-4    B125  5-120    B111  0.05-1   B116  0.2-3.5
B122  0.5-9    B126  20-260    B112  0.1-2   B117  0.5-8
B123  0.5-11    B127  20-320    B113  0.2-3   B118  0.5-12
B124  1-16    B128  20-500    B114  0.2-4   B119  1-16
             B115  0.5-5   B120  1-22

*All air flow rates at 70°F and 14.7 psia

Design Features

• Precision tapered, fluted metering tube
• Fully protected assembly using aluminum meter case
• Unobstructed flow path area for low pressure drop increases available flow rates at low feed pressures
• Precision machined float
• Spring float stops absorb line shock
• Float/Scale correlation symbol and float reading edge instructions permanently screened on meter window

Materials of Construction

• Wetted End Blocks, Fittings and Internal Parts: Brass
• Seal Materials: Buna-N
• Side Plates: Black Painted aluminum
• Metering Tube: Borosilicate glass
• Piping Connections: Brass
• Float Material: 316 stainless steel
• Scale: Permanently screened on inside of meter window


• Accuracy: ±10% of full scale flow rate


• Pressure Rating: 200 psi maximum @ 200°F
• Temperature Rating: 250°F maximum
• Range: 10 to 1, i.e., 100% to 10% of full scale
• Scale Readings: Direct reading (air)
• Shipping Weight: 2 lbs

Correction Factors

Rotameter Pressure Correction Factors

Rotameter Temperature Correction Factors

Rotameter Gas Correction Factors


Instructions, FM-1100/FM-1127

Engineering Drawings

Engineering Drawings, Rotameters

3D Model


Warranty Information

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