Series GFM2 Gas Mass Flow Meter

Gas Mass Flow Meter
±1% FS, Programmable Relays

±1% FS, Programmable Relays

The SERIES GFM2 Gas Mass Flow Meter is an ideal choice for the measurement of flow rates of a wide variety of gases. Unit can be calibrated for a variety of gases with user selectable 0 to 5 VDC or 4 to 20 mA and two relay outputs and programmable totalizer that indicates total gas quantity.

Product Applications

  • Gas flow measurement
  • Gas glow control
  • Operating pumps and valves
  • Process equipment
  • Vacuum processes
  • Glass and metal coating
  • Film deposition
More Information
Model Chart
EXAMPLEGFM2AIR010ABALA2Series GFM2-AIR-010-A-B-A-L-A-2, Gas Mass Flow Meter
SERIESGFM2        GFM2 Gas Mass Flow Meter
SPECIALTY GAS
K FACTOR AND
DESIRED GAS
 AIR
AR
C2H2
C3H8
C4H10
CH4
CO
CO2
HE
HF
H2
N2
NH3
O2
SO2
       1.0000 Air
1.4573 Argon
0.5839 Acetylene
0.3500 Propane
0.2631 Butane
0.7175 Methane
1.0000 Carbon Monoxide
0.7382 Carbon Dioxide
1.4540 Helium
0.9998 Hydrogen Fluoride
1.0106 Hydrogen
1.0000 Nitrogen
0.7310 Ammonia
0.9926 Oxygen
0.6900 Sulfur Dioxide
BODY SIZE  010
050
100
      Low Flow
Medium Flow
High Flow
BODY MATERIAL   A
S
     Aluminum
Stainless Steel
SEAL MATERIAL    B
E
T
V
    Buna-N
EPR
PTFE
Fluoroelastomer
FITTINGS     A
B
D
   1/4” Compression (low)
1/8” Compression (medium)
3/8” Compression (high)
DISPLAY      L
N
  LCD Display
No Display
OUTPUT SIGNAL       A
B
 0-5 VDC
4-20 mA
DIGITAL INTERFACE        2
5
9
RS232
RS485
Profibus
Service:Clean gases compatible with wetted parts.
Wetted Materials:>      GFM2-X-X-A: Anodized aluminum, brass, 316 SS fluoroelastomer O-rings; 
      GFM2-X-X-S: 316 SS, and fluoroelastomer O-rings; Buna-N, EPR and PTFE O-rings optional.
Accuracy:±1% FS.
Repeatability:±0.25% FS.
Response Time:2 seconds to within ±2% of actual flow.
Output Signal:Linear 0 to 5 VDC (3000 Ω min. load impedance) and 4 to 20 mA (500 Ω max. loop resistance).
Relay Rating:1 A @ 24 VDC.
Max. Particulate Size:5 microns.
Temperature Limits:32 to 122°F (0 to 50°C).
Power Supply:11 to 26 VDC.
Process Connections:1/8" compression fitting for flow rates ≤10 L/min; 1/4" for ≤50 L/min; 3/8" for ≤100 L/min.
Display:2 x 16 character LCD (optional).
Pressure Limits:500 psig (34.5 bar).
Leak Integrity:1 x 10-9 smL/sec of helium.
Weight:1.05 lb (0.48 kg).
  • Utilizes a straight tube sensor with a restrictor flow element to provide a high ±1% FS accuracy and ±0.25% FS repeatability
  • Gas flow can be displayed in 23 different engineering units on an optional 2x16 character LCD display with internal conversion factors for up to 32 gases
  • Digital RS-232 or RS-485 interfaces allow for easy communication and for multi-drop capability of up to 256 units (RS-485 only)
  • User-friendly interface allows for the programming of high and low gas flow alarms, along with two user-programmable electromechanical SPDT relays with latch options
  • Stores calibration information for up to 10 different gases, internal or user-specific K-factors
  • Automatic sensor zero offset adjustment (via digital interface or local push button)
  • NIST traceable certificate included
  • Self-diagnostic tests