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PERFORMANCE SPECIFICATIONS
CIRCULAR RECTANGULAR
Accuracy: Typically ±1% with Flow
Straighteners
Typically ±2% with Flow
Straighteners
Repeatability: ±0.1% with Flow Straight-
eners
±0.2% with Flow
Straighteners
Min/Max permissible
measured
Differential
Pressure:
0.01" to 6.25" w.c. (0.254 to 159 mmwg). This repre-
sents a velocity of 400 to 10,000 fpm (2.0 to 50.8 m/s)
of air @ 68o F, 14.7 psia / abs.
Unrecovered
Pressure Loss:
Approximately 30% of measured DP
Example: At a Velocity of 4000 FPM @ S.T.P., the mea-
sured D.P. is 1.0" w.c. The permanent pressure loss is
30% of 1.0"w.c. or .30" w.c.
Flow Range: 25:1 maximum turndown
FUNCTIONAL SPECIFICATIONS
CIRCULAR RECTANGULAR
Maximum Static
Pressure:
Carbon Steel casing: 6
psig (0.27 bar) @ 325°F
(163°C)
Carbon Steel casing: 1
psig (0.07 bar) @ 325°F
(163°C)
304 Stainless Steel cas-
ing: 8 psig (0.87 bar) @
750°F (400° C)
304 Stainless Steel cas-
ing: 1 psig (0.07 bar) @
750°F (400°C)
High Pressure configurations possible. Consult factory.
Temperature: Stainless Steel / Carbon Steel: -200°F to 750°F
(-128°C to 400°C)
With Aluminum flow straighteners: -67°F to 300°F
(-55°C to 162°C)
Higher temperatures possible. Consult factory.
PHYSICAL SPECIFICATIONS
CIRCULAR RECTANGULAR
Minimum Sizes: 8" (200mm) Dia. 10" (250mm) per Side.
For smaller sizes, consult factory for availability & pricing
Sensors: 304 or 316 Stainless Steel w/Argon welded joints
Process Connections:
316 Stainless Steel, 1/4 NPTF
Flow Straighteners:
3/8" Hexagonal cells either Aluminum (3.5" Deep),
304 or 316 Stainless Steel (2.5" Deep). Stainless
Steel is of welded construction.
For high velocities reinforced Flow Straighteners (6
mil. thick, welded every node) are available.
Casing/Flanges: Carbon Steel (epoxy coated with rust inhibiting
primer), 304 Stainless Steel or 316 Stainless Steel. All
joints are continuously seam welded. Flanges with
bolt holes are standard. For other materials, coatings,
etc. consult factory for pricing & availability.
Note: End flange mounting hardware not supplied.
INSTALLATION
WORST CASE
CONDITIONS
RECOMMENDED
INSTALLATION
Configuration Accuracy Rep.% Upstream Downstream
Fan Inlet
w/Bell
1.O% 0.10% 1 Dia. 2 Dia
Fan Outlet 1-2% 0.10% 3 Dia. 2 Dia.
Compressor
Outlet
1-2% 0.10% 3 Dia. 2 Dia.
Elbow or Tee 3-5% 0.10% 5 Dia. 2 Dia.
2 Elbows
same plane
4-6% 0.10% 7 Dia. 2 Dia.
2 Elbows Different
Planes
5-7% 0.10% 8 Dia. 2 Dia.
WORST CASE CONDITIONS = No Upstream Or Downstream Straight Run
RECOMMENDED INSTALLATION = Number Of Upstream And Downstream
Straight Run Necessary For Optimum Performance.
For Installation Configurations Not Shown, Consult Factory.
SPECIFYING THE DSK1000
Flow measuring station shall be of the pitot averaging
type. The pitot array shall be encased in a flanged section
(spool piece) with air flow straightening vanes mounted at
the inlet. Flange to flange dimensions shall be 12 inches.
All components shall be constructed from 304SS/316SS
or epoxy painted carbon steel, all continuous weld.
Air flow straightening vanes shall have 3/8 inch hexagon
cells with a Length/Diameter Ratio of 7 to 9. Impact ports
shall be shrouded with kiels to reduce noise and improve
velocity profile at the point of measurement. Static pressure
shall be measured by hemispherical tipped static
wands, aligned parallel with the direction of flow. All process
connections shall be 1/4" NPTF. Accuracy / Repeatability
shall be ±1.0% / ±0.1% with a flow turndown range
of 25:1.
About Thermo
For over 20 years ,Thermo Electron has been the recognized
leader in the measurement of air/gas flow and
very low differential pressure in industrial applications.
Thermo offers a complete line of pitot/static probes and arrays,
D.P. Transmitters, the unique Nozzle Pitot flow sensor
and a complete family of Current to Pressure (I/P) and
Pressure to Current (P/I) Transducers.
DSK1000 Series Air/Gas Flow Sensor
Thermo Electron Corp.
1410 Gillingham Lane
Sugar Land, Texas 77478
Telephone: (713) 272-0404 Fax: (713) 272-2273
Represented By:
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