conductivity - Omega Engineering

AIR FLOW
Where:
Q = Volumetric Flow Rate
P1 = Static pressure at the inlet
P2 = Static pressure at the outlet
r = Radius of the restriction
h = (eta) absolute viscosity
of the fluid
L = Length of the restriction
Since p, r and L are constant;
Equation 1 can be rewritten as:
Q = K (∆P/h) (Equation 2)
Where K is a constant factor determined
by the geometry of the restriction.
Equation 2 shows the linear relationship
between volumetric flow rate (Q)
differential pressure (DP) and absolute
viscosity (h) in a simpler form.
All the flow meters are equipped with
female NPT inlet and outlet port
connections. They are position
insensitive and may be mounted in any
orientation that is convenient. The inlet
and outlet ports are equal in size and
symmetric
(in-line). Normally speaking, the port
sizes and dimensions for differing flow
ranges are as follows:
Specifications
FMA-1600/FVL-1600
Accuracy: ±1% full scale for air
Accuracy of Gas Select Feature:
2% full scale
Repeatability ±0.5% full scale
Response Time* (Typical): 10 ms
Output: 0-5 Vdc standard
Pressure Drop** (Typical):
0.4 psid full Scale
Operating Temperature
-10 to 50°C (14 to 122°F)
Zero Shift: 0.02% full scale/°C
Span Shift: 0.02% full scale/°C
Humidity Range: 0 - 100% noncondensing
Supply Current***
(Typical): 0.25 A to 1 A
Excess Flow Rate: 20X full scale
Common Mode
Pressure (max): 125 psig
Supply Voltage:
Turbulent Flow
7 to 30 Vdc
Cable Connection:
8 pin mini DIN
Zero Shift:
0.02% Full scale/°C
Span Shift:
0.02% Full scale/°C
Humidity Range:
0 - 100% non-condensing
Supply Current***
(Typical): 0.25 A to 1 A
Excess Flow Rate: 20X Full scale
Common Mode Pressure (max):
125 psig
Supply Voltage: 7 to 30 Vdc
Cable Connection: 8 pin mini DIN
Inlet
Inlet
Inlet
Differential Pressure Sensor
Laminar Flow
Laminar Flow
Laminar Flow
Cavity Plate
Outlet
Laminar Plate
Spacer
Outlet
Laminar Plate
Spacer
Outlet
*Very low flow devices may have special ports to reduce dead volume.
LAMINAR FLOW ELEMENT
Turbulent Fl
Dimensions
Flow Range Height Length Depth Port Size
20(S) LPM and under* 4.082" 2.375" 1.05" 1/8"NPT(F)
50 (S) LPM 4.207" 2.625" 1.05" 1/4"NPT(F)
100 (S) LPM 4.367" 3.5" 1.6" 1/4"NPT(F)
250 to 1000 (S) LPM 5.242" 3.5" 1.6" 1/2"NPT(F)
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For the complete selection of Air Flow products,
refer to The Green Book ®
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