Aalborg GFM67 Mass Flowmeter

SKU
GFM67
Manufacturer:
Aalborg
Aalborg

Key Features:

  • Rigid metallic construction
  • Maximum pressure of 500 PSIG (34.5 bars)
  • Leak integrity 1 x 10-7 of helium
  • Built-in tiltable LCD readout
  • 0-5 Vdc and 4-20 mA signals
  • Circuit protection
  • Can be used as a portable device
  • Engineering units or 0 to 100% displays
  • Totalizer option
Product Options:

Maximum 25 characters

Maximum 25 characters

Maximum 25 characters

$1,341.00

Secured and trusted checkout with

Aalborg GFM67 is a low cost solution to digital mass flow metering

Principles of Operation

Metered gases are divided into two laminar flow paths, one through the primary flow conduit, and the other through a capillary sensor tube. 

Both flow conduits 
are designed to ensure laminar flows and therefore the ratio of their flow rates is constant. 

Two precision temperature sensing windings on the sensor tube are heated, and when flow takes place, gas carries heat from the upstream to the downstream windings. The resultant temperature differential is proportional to the change in resistance of the sensor windings.

A Wheatstone bridge design is used to monitor the temperature dependent resistance gradient on the sensor windings which is linearly proportional to the instantaneous rate of flow.

Output signals of 0 to 5Vdc and 4 to 20mA are generated indicating mass molecular based flow rates of the metered gas.

Flow rates are unaffected by temperature and pressure variations within stated limitations.

General Description

Compact, self contained GFM mass flow meters are designed to read flow rates of gases. The rugged design coupled with instrumentation grade accuracy provides versatile and economical means of flow control.

Aluminum or stainless steel models with readout options of either engineering units (standard) or 0 to 100 percent displays are available. 

The mechanical layout of the design includes an LCD readout built into the top of the transducer. This readout module is tiltable over 90 degrees to provide optimal reading comfort. It is connected to the transducer by a standard modular plug, and is also readily removable for remote reading installations. Transducers without LCD readout are offered for OEM applications.

GFM mass flow meters are available with flow ranges from 10 sccm to 1000 sL/min N

2.  Gases are connected by means of 1/4” 3/8” 1/2” compression fittings and 3/4” FNPT fittings. Optional fittings are available. These controllers may be used as bench top units or mounted by means of screws in the base.

Transducer power supply ports are fuse and polarity protected.

Leak Integrity

1 x 10

-7 smL/sec of helium max to outside environment.

ACCURACY:

GFM 17, 37 and 47: ±1.0% of full scale.

GFM 57, 67 and 77: ±1.5% of full scale. OPTIONAL ENHANCED ACCURACY: ±1.0% of full scale.

CALIBRATIONS:

Performed at standard conditions [14.7 psia (101.4 kPa) and 70 ºF (21.1 ºC)] unless otherwise requested.

REPEATABILITY:

±0.25% of full scale.

RESPONSE TIME:

Generally 2 seconds to within ±2% of actual flow rate over 25 to 100% of full scale.

TEMPERATURE COEFFICIENT:

0.15% of full scale / ºC.

PRESSURE COEFFICIENT:

0.01% of full scale / psi (0.07 bar).

MAXIMUM PRESSURE DROP:

See the Data Sheet.

GAS and AMBIENT TEMP.:

32 ºF to 122 ºF (0 ºC to 50 ºC). 14 ºF to 122 ºF (-10 ºC to 50 ºC) - Dry gases only.

OUTPUT SIGNALS:

Linear 0-5 Vdc. 1000 ohms min. load impedance and 4-20 mA 0-500 Ohms loop resistance..

TRANSDUCER INPUT POWER:

Universal +12 to +26 VDC, 200 mA maximum.

TIME CONSTANT:

800 ms.

GAS PRESSURE:

1000 psig (70 bars) maximum GFM 17, 37, 47. 20 psig (1.4 bars) optimum.

500 psig (34.5 bars) GFM 57, 67, 77. 20 psig (1.4 bars) optimum.

** MATERIALS IN FLUID CONTACT:

a. Aluminum models GFM Series: anodized aluminum, 316 stainless steel, brass and Viton® O-rings.

b. Stainless steel models GFM17S, 37S,47S, 57S, 67S and 77S: 316 stainless steel and Viton®  O-rings. Optional O-rings: Buna®, EPR and Kalrez®.

ATTITUDE SENSITIVITY:

No greater than +15 degree rotation from horizontal to vertical; standard calibration is in horizontal position.

CONNECTIONS:

GFC 17:     1/4" compression fittings. Optional: 6mm, 3/8" and 1/8" compression fittings or 1/4" VCR®.

GFC 37:     1/4" compression fittings. Optional: 6mm and 3/8" compression fittings or 1/4" VCR®.

GFM 47:   3/8" compression fittings.

GFM 57:   3/8" compression fittings.

GFM 67:   1/2" compression fittings.

GFM 77:   3/4" FNPT fittings or 3/4" compression fittings.

LEAK INTEGRITY:

1 x 10-9 smL/sec of helium maximum to the outside environment.

CE COMPLIANT:

EN 55011 class 1, class B; EN50082-1.

**The selection of materials of construction, is the responsibility of the customer. The company accepts no liability.

Write Your Own Review
Only registered users can write reviews. Please Sign in or create an account

Products In This Series

As low as

Now $632.00

As low as

Now $823.00

As low as

Now $1,103.00

As low as

Now $1,251.00