323
Mass Flowmeters/
Controllers
FLOW
±1% FS, Programmable Relays
The
SERIES GFM2
Gas Mass Flow Meters
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.
FEATURES/BENEFITS
• 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
APPLICATIONS
• Gas flow measurement
• Gas flow control
• Operating pumps and valves
• Process equipment
• Vacuum processes
• Glass and metal coating
• Film deposition
PROCESS CONNECTION
[COMPRESSION FITTINGS ATTACHED]
4-29/64
[112.97]
3-5/32 [80.16]
1-1/8
[28.70]
5-5/16 [134.88]
SPECIFICATIONS
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).
FLOW RANGES
ml/min
l/min
10
20
50
100
200
500
1000
2
5
10
20
30
40
50
60
80
100
Note:
Specify flow
range at time of order
MAXIMUM FLOW RANGE (l/min)
Body Size AIR AR C
2
H
2
C
3
H
8
C
4
H
10
CH
4
CO
010
050
100
10
50
100
10
50
100
5
20
50
2
10
30
2
5
20
5
30
60
10
50
100
MAXIMUM FLOW RANGE (l/min)
Body Size CO
2
HE H
2
N
2
NH
3
O
2
SO
2
010
050
100
5
30
60
10
50
100
10
50
100
10
50
100
5
30
60
10
50
100
5
30
60
SERIES GFM2
®
DWYER INSTRUMENTS, INC. | www.dwyer-inst.com
USA: California Proposition 65
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
ACCESSORIES
Model
Description
A-110NA12
110 VAC power supply, 12 VDC with
communication interface branch
MODEL CHART
Example GFM2 -AIR
-010 -A -V -A -N -A -2 GFM2-AIR-010-A-V-A-N-A-2
Series
GFM2
Gas mass flow meter
Specialty
Gas &
K-Factor
AIR
AR
C2H2
C3H8
C4H10
CH4
CO
CO2
HF
HE
H2
N2
NH3
O2
SO2
Air 1.0000
Argon 1.4573
Acetylene 0.5829
Propane 0.3500
Butane 0.2631
Methane 0.7175
Carbon monoxide 1.0000
Carbon dioxide 0.7382
Hydrogen fluoride 0.9998
Helium 1.4540
Hydrogen 1.0106
Nitrogen 1.0000
Ammonia 0.7310
Oxygen 0.9926
Sulfur dioxide 0.6900
Body
Size
010
050
100
Low flow
Medium flow
High flow
Body
Material
A
S
Aluminum
Stainless steel: Body size = 010
Body size = 050
Body size = 100
Seal
Material
V
B
E
T
Fluoroelastomer
Buna-N
EPR
PTFE
Fittings
A
B
D
1/4˝ compression (low)
1/8˝ compression (medium)
3/8˝ compression (high)
Display
N
L
No display
LED display
Output
Signal
A
B
0 to 5 VDC
4 to 20 mA
Digital
Interface
2
5
9
RS232
RS485
PROFIBUS