| The
Type “S” Pitot tube is
constructed from two formed tubes with each leg or port on the same
plane but facing opposing directions. The theory is based on when the
pitot is faced into the gas stream flow the pressure difference between
the two ports equates to the velocity pressure, DP.
This differential velocity pressure is measured with devices, such as
liquid manometers or electronic pressure transducers. |
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Type
“S” Pitot Tube Design Advantages
• Large sensing openings resist plugging in particulate-laden
and saturated gas streams
• Compact design fits easily in sampling ports
• Maintains calibration in harsh environments
• High differential pressure readings are beneficial in low
velocity gas streams
• Suitable for determining cyclonic flow and measuring yaw
angle of the velocity vector
• Economically priced
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Sampling
Location
US EPA Method 1 is performed to locate an appropriate sampling location
to complete a velocity or particulate traverse. The sampling locations
must meet certain criteria to be valid such as, the duct diameter size
and the sampling location relative to flow disturbance locations to
ensure laminar, non-cyclonic, flow in the stack.
Velocity
Measurement
US EPA Method 2 is
performed to determine the average stack gas velocity from measurement
of the gas density and average velocity head using Type
“S” (Stausscheibe or reverse type) pitot tube. Apex
Instruments manufactures and guarantees Type “S”
pitot tubes in accordance with the Method 2 design specifications.
However, calibration is not standard with purchase of pitot tubes. Apex
Instruments offers calibration equipment and services. A
variety of materials, sizes and configurations are available. The most
common are constructed from either 1/4 inch or 3/8 inch OD Stainless
Steel or Inconel 600 tubing.
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Ordering Information:
Note:
Quick Connects are not included. Order Quick Connects
separately. |
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Modular Pitot Tubes
|
| The unique design of
the Apex Modular Pitot Tip reduces the collection
of water droplets in the pitot lines. The lower tube is self-draining
while the offset in the upper tube acts as water trap. The water can be
easily cleared by tilting the tip or by back purging. |
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Modular Pitot Tips Only
|
| Part # |
Description |
| MPT-6-133 |
Replacement
Type "S" Modular Pitot Tip for Oversheath Probes |
| MPT-6-181 |
Replacement
Tip for Standard Method 5 Pitot |
| MPT-6-218 |
Extended Pitot
Tip for SFA-47 |
| MPT-6-252 |
Extended Pitot
Tip for PM10 and SFA-47 |
| MPT-6-320 |
Extended Pitot
Tip for SFA-190, SFA-300 and SFA-2590 |
| MPT-6-421 |
Extended Pitot
Tip for PM10-2.5 and SFA-47 |
|
|
Modular Pitot Tube Extensions
(constructed from 3/8" tubing)
|
| Part
# |
Description |
| PTB-3
|
Modular
Pitot Body (without tip), 3/8" Tube, Pistol Grip, 3 ft. length |
| PTE-2 |
2
ft. Modular Pitot Extension, 3/8" Tube |
| PTE-3 |
3
ft. Modular Pitot Extension, 3/8" Tube |
| PTE-4 |
4
ft. Modular Pitot Extension, 3/8" Tube |
|
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Stainless Steel Unions and Quick Connects
| Part
# |
Description |
| 4TUR6-S |
SS
Tube End Reducer, 3/8" Tube Union to 1/4" Tube Stub |
| 6SC6-S |
SS
Tube Union, 3/8" |
| QC-M4-SS |
SS
Quick Connect, 1/4” Male |
| QC-M6-SS |
SS
Quick Connect, 3/8” Male |
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Telescopic Type "S" Pitot Tube
|
Apex Instruments Telescoping Pitot Probe is our most innovative pitot
tube design. This allows the versatility of traversing larger stacks
with optional telescoping ranges while providing the ability to package
this probe in a compact container. This will not only save on
shipping/transportation charges but will also reduce the damage to the
pitot tips by eliminating the cumbersome nature of longer pitot tubes.
The design incorporates a pitot tube with 1 inch OD oversheath
connected to a 2 inch OD extension (32PTX-o)with
adjustable clamp. Rigid or flexible tubing connections are available.
3/8 inch ID PTFE with stainless steel overbraid is recommended. PTFE or
glass insulated type K thermocouples with overbraid are available.
Varying pitot tube lengths are available. Please call for details. |
 |
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2-Dimensional Probe
|
The Apex Instruments Type ‘S’
2-Dimensional Probe is used in Method 2G to measure the
velocity pressure and the yaw angle of the flow velocity vector in a
stack or duct. From these measurements and a determination of the stack
gas density, the average near-axial velocity of the stack gas is
calculated. The near-axial velocity of the stack gas accounts for the
yaw, but not the pitch component of flow. The average gas volumetric
flow rate in the stack or duct is then determined from the average
near-axial velocity.The four foot type “S” pitot
with thermocouple well is constructed from heavy wall 3/8 inch
stainless steel tubing and sheathed with 1inch tubing. The sheath is
scribed down the length of the tube for alignment of the inclinometer
and for determination of the calibrated yaw offset. The pitot is
designed to be inserted into our 2 inch diameter probe extension. The
pitot tube must be calibrated in accordance with Method 2G prior to use. |
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