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Type "S" Pitot Tubes
| 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. Click
here for details. 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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Click on the following to view or download. 
Ordering Information:
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Note: Quick Connects are not included. Order Quick
Connects separately.
Click
on image to view or download.
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Modular Pitot Tubes
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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. |
Modular
Pitot Tips Only
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| 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 |
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Modular Pitot Tube Extensions
(constructed from 3/8" tubing)
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Click
on image to view or download.
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| 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 |
Stainless Steel Unions and Quick Connects
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| 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
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 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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Click on image to view or download.
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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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Click on image to view or download.
Shown with Probe Extension
Assembly (32PTX-o), Universal
Port Flange w/Extension
(PF-346XT32S) and Brass Bushing (32M/32F-B)
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