Series FLST Duct Mounted Airflow Measurement Station

Rectangular, Oval or Circular Configurations

The SERIES FLST Airflow Measurement Station is easy to install -- simply connect the tubing to the station fittings, then to a differential pressure manometer, gage, transmitter or switch. Single or multiple airflow elements are factory mounted and pre-piped in a casing designed for flanged connection to the duct work. Standard materials consist of a G90 galvanized casing and 6063-T5 anodized aluminum flow sensors, suitable for most HVAC applications.

The Series FLST utilizes an airflow averaging element in a head-type device, generating a differential (velocity) pressure signal similar to the orifice, venturi, and other had producing primary elements. Strategically located sensing ports continually sample the total and static pressures when inserted normal to flow.

Total pressure sensed by the upstream ports are continually averaged within the airflow element in an isolated chamber. The static sensing ports are averaged in a second isolation chamber. Multiple elements are joined together for connection to a differential measurement device (gage, transmitter, etc.) for flow measurement and indication purposes.

Product Applications

  • Building air intake and exhaust flow rate measurement
  • HVAC air flow measurement

Models & Ordering

Build Your Custom Part. Use our Product Configurator

Specifications

Accuracy:
Within 2% of actual flow when installed in accordance with published recommendations.
K-Factor:
0.97.
Velocity Range:
100 to 10,000 FPM (0.51-51 m/s).
Wetted Materials:
Elements: 6063-T5 anodized aluminum; Casings: 16 ga G90 galvanized steel.
Temperature Limits:
Galvanized casings and aluminum elements: 350°F (177°C) continuous operation (in air) 400°F (204°C) intermittent operation (in air).
Humidity:
All airflow stations 0 to 100% non-condensing.
Process Connections:
1/4" compression fittings.

Features

  • Low signal-to-noise ratio
  • Factory mounted and pre-piped in a flanged duct section (casing)
  • Standard construction includes galvanized casing and 6063-T5 anodized aluminum flow sensors
  • Standard airflow stations can be operated (in air) continuously in temperatures up to 350°F or intermittently in temperatures up to 400°F

Options

  • IM - Internal Pressure Connections.
  • F - (Oval Stations Only).

Model Chart

Rectangular or Oval Models:
EXAMPLE FLST O 12 X16 IM Series FLST-R12X16-IM Duct Mounted Airflow Measurement Station, 12" x 16" oval duct, with internal pressure connections.
SERIES FLST         Duct Mounted Airflow Measurement Station
CONFIGURATION   O
R
      Oval
Rectangular
DUCT HEIGHT     8
10
12
14
16
18
20
22
24
26
28
29
30
32
34
36
38
40
44
46
48
52
56
60
64
66
72
78
84
90
94
96
102
108
114
120
250MM
300MM
350MM
400MM
410MM
450MM
500MM
510MM
625MM
700MM
800MM
1000MM
1200MM
1250MM
2000MM
    8"
10"
12"
14"
16"
18"
20"
22"
24"
26"
28"
29"
30"
32"
34"
36"
38"
40"
44"
46"
48"
52"
56"
60"
64"
66"
72"
78"
84"
90"
94"
96"
102"
108"
114"
120"
250MM
300MM
350MM
400MM
410MM
450MM
500MM
510MM
625MM
700MM
800MM
1000MM
1200MM
1250MM
2000MM
DUCT WIDTH       X8
X10
X12
X14
X16
X18
X19
X20
X22
X24
X26
X28
X29
X30
X32
X34
X35
X36
X38
X40
X41
X42
X44
X46
X47
X48
X50
X52
X54
X56
X58
X60
X62
X66
X72
X78
X84
X90
X96
X98
X102
X108
X114
X120
X250MM
X300MM
X350MM
X400MM
X450MM
X500MM
X510MM
X560MM
X600MM
X700MM
X750MM
X755MM
X800MM
X825MM
X915MM
X1000MM
X1015MM
X1100MM
X1200MM
X1250MM
X1300MM
X1600MM
X1800MM
X2200MM
  8"
10"
12"
14"
16"
18"
19"
20"
22"
24"
26"
28"
29"
30"
32"
34"
35"
36"
38"
40"
41"
42"
44"
46"
47"
48"
50"
52"
54"
56"
58"
60"
62"
66"
72"
78"
84"
90"
96"
98"
102"
108"
114"
120"
250MM
300MM
350MM
400MM
450MM
500MM
510MM
560MM
600MM
700MM
750MM
755MM
800MM
825MM
915MM
1000MM
1015MM
1100MM
1200MM
1250MM
1300MM
1600MM
1800MM
2200MM
OPTIONS         F
IM
SS1
SS2
SS3
1-1/2" Flange for Oval Mount Station Only
Internal Pressure Connections
316 SST Elements with 16 GA Galvanized Casing
316 SST Elements with 16 GA 304 SST Casing
316 SST Elements with 16 GA 316 SST Casing

Circular Models:
EXAMPLE FLST C 12 IM Series FLST-C12-IM Duct Mounted Airflow Measurement Station, 12" diameter duct, with internal pressure connections.
SERIES FLST       Duct Mounted Airflow Measurement Station
CONFIGURATION   C     Circular
DUCT DIAMETER     8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
40
44
48
54
60
64
66
72
78
84
90
96
102
108
114
120
600MM
750MM
950MM
  8"
10"
12"
14"
16"
18"
20"
22"
24"
26"
28"
30"
32"
34"
36"
40"
44"
48"
54"
60"
64"
66"
72"
78"
84"
90"
96"
102"
108"
114"
120"
600MM
750MM
950MM
OPTIONS       IM
SS1
SS2
SS3
Internal Pressure Connections
316 SST Elements with 16 GA Galvanized Casing
316 SST Elements with 16 GA 304 SST Casing
316 SST Elements with 16 GA 316 SST Casing

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