Air Velocity
Air Velocity
Table of Contents
Meters/Thermo-Anemometers/Pitot Tubes
pgs 201-211
Air Velocity Measurement . . . . . . . . . . . . . . . . . . . . . . . .197-199
Air Velocity
Air Velocity Flow Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200
Series 400 Air Velocity Meters . . . . . . . . . . . . . . . . . . . . . . . .201
Series 100 AV Durablock® Air Velocity Gage Kits . . . . . . . . .202
Mark II Molded Plastic Air Velocity Meters . . . . . . . . . . . . . .203
Series 160 Stainless Steel Pitot Tubes . . . . . . . . . . . . . . . . .204
Series 160E Ellipsoidal Tip Pitot Tube . . . . . . . . . . . . . . . . . .205
Series 160S “S” Type Stainless Steel Pitot Tubes . . . . . . . .205
Model 166T Telescoping Stainless Steel Pitot Tube . . . . . . .205
Series DS In-Line Flow Sensors . . . . . . . . . . . . . . . . . . .206-207
Air Velocity Kits
pgs 211-212
Transmitters
pgs 213-217
Model A-471 Portable Kit . . . . . . . . . . . . . . . . . . . . . . . . . . .207
Series 471 Digital Thermo-Anemometer . . . . . . . . . . . . . . . .208
Model 470-1 Handheld Thermal Anemometer . . . . . . . . . . .209
Model VT120 Integral Vane Thermo-Anemometer . . . . . . . .209
Model VT140 Vane Thermo-Anemometer . . . . . . . . . . . . . . .210
Model VT-200 Vane Thermo-Anemometer . . . . . . . . . . . . . .210
Series MVT Mini-Vane Thermo-Anemometer . . . . . . . . . . . .211
Model PATH Path Super Kit . . . . . . . . . . . . . . . . . . . . . . . . . .211
Model 475-1-FM-AV Air Velocity Kit . . . . . . . . . . . . . . . . . . .212
Model 475-1T-FM-AV Air Velocity Kit . . . . . . . . . . . . . . . . . .212
Model 477-1T-FM-AV Air Velocity Kit . . . . . . . . . . . . . . . . . .212
Series 641 Air Velocity Transmitter . . . . . . . . . . . . . . . . . . . .213
Series 641RM Air Velocity Transmitter with Cable . . . . . . . .214
Series 641B Air Velocity Transmitter . . . . . . . . . . . . . . . . . . .215
Series PF Precision Flow™ Air Velocity Transmitter . . . . . . .216
Series PFS Smart Air Velocity Transmitter . . . . . . . . . . . . . .216
Model AFH Electronic Balometer . . . . . . . . . . . . . . . . . . . . .217
No. 480 VaneometerTM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218
No. 460 Air Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218
Model 660 Air Velocity Monitor . . . . . . . . . . . . . . . . . . . . . . .219
Wind Speed Indicator/Portable Wind Meter . . . . . . . . . . . . .219
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Air Velocity Measurement
Air Velocity
Introduction
In air conditioning, heating and ventilating work, it is helpful to understand the techniques used to determine air velocity. In this field,
air velocity (distance traveled per unit of time) is usually expressed
in feet per minute (FPM). By multiplying air velocity by the cross section area of a duct, you can determine the air volume flowing past a
point in the duct per unit of time. Volume flow is usually measured in
cubic feet per minute (CFM) .
Velocity or volume measurements can often be used with engineering handbook or design information to reveal proper or improper
performance of an airflow system. The same principles used to determine velocity are also valuable in working with pneumatic conveying, flue gas flow and process gas systems. However, in these
fields the common units of velocity and volume are sometimes different from those used in air conditioning work.
To move air, fans or blowers are usually used. They work by imparting
motion and pressure to the air with either a screw propeller or paddle
wheel action. When force or pressure from the fan blades causes the air
to move, the moving air acquires a force or pressure component in its
direction of motion due to its weight and inertia. Because of this, a flag
or streamer will stand out in the air stream. This force is called velocity pressure. It is measured in inches of water column (w.c.) or water
gage (w.g.). In operating duct systems, a second pressure is always present. It is independent of air velocity or movement. Known as static
pressure, it acts equally in all directions. In air conditioning work, this
pressure is also measured in inches w.c.
In pressure or supply systems, static pressure will be positive on the
discharge side of the fan. In exhaust systems, a negative static pressure will exist on the inlet side of the fan. When a fan is installed
midway between the inlet and discharge of a duct system, it is normal
to have a negative static pressure at the fan inlet and positive static
pressure at its discharge.
Total pressure is the combination of static and velocity pressures,
and is expressed in the same units. It is an important and useful concept to use because it is easy to determine and, although velocity pressure is not easy to measure directly, it can be determined easily by
subtracting static pressure from total pressure. This subtraction need
not be done mathematically. It can be done automatically with the instrument hook-up.
Sensing Static Pressure
For most industrial and scientific applications, the only air measurements needed are those of static pressure, total pressure and temperature. With these, air velocity and volume can be quickly calculated.
To sense static pressure, six types of devices are commonly used.
These are connected with tubing to a pressure indicating instrument.
Fig. 1-A shows a simple thru-wall static pressure tap. This is a sharp,
burr-free opening through a duct wall provided with a tubing connection of some sort on the outside. The axis of the tap or opening must
be perpendicular to the direction of flow. This type of tap or sensor is
used where air flow is relatively slow, smooth and without turbulence.
If turbulence exists, impingement, aspiration or unequal distribution
of moving air at the opening can reduce the accuracy of readings significantly.
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Fig. 1-B shows the Dwyer No. A-308 Static Pressure Fitting. Designed for simplified installation, it is easy to install, inexpensive, and
provides accurate static pressure sensing in smooth air at velocities up
to 1500 FPM.
Fig. 1-C shows a simple tube through the wall. Limitations of this type
are similar to wall type Fig. 1-A.
Fig. 1-D shows a static pressure tip which is ideal for applications such
as sensing the static pressure drop across industrial air filters and refrigerant coils. Here the probability of air turbulence requires that
the pressure sensing openings be located away from the duct walls to
minimize impingement and aspiration and thus insure accurate readings. For a permanent installation of this type, the Dwyer No. A-301 or
A-302 Static Pressure Tip is used. It senses static pressure through radially-drilled holes near the tip and can be used in air flow velocities up
to 12,000 FPM.
Fig. 1-E shows a Dwyer No. A-305 low resistance Static Pressure Tip.
It is designed for use in dust-laden air and for rapid response applications. It is recommended where a very low actuation pressure is required for a pressure switch or indicating gage — or where response
time is critical.
Under field conditions, air turbulence in a duct or plenum often makes
it impossible to quickly install and align a rigid static pressure sensor
to take accurate readings. Under these circumstances, the Dwyer TrailTail® Static Pressure Sensor (Fig.1-F),can be quickly inserted through
a small hole in the duct and will trail into automatic alignment with the
air stream. The pressure sensing holes in this device are thus presented at a 90° angle to actual air flow assuring quick, consistent, accurate
readings.
Measuring Total Pressure and Velocity Pressure
In sensing static pressure we make every effort to eliminate the effect of
air movement. To determine velocity pressure, it is necessary to determine these effects fully and accurately. This is usually done with an impact tube which faces directly into the air stream. This type of sensor is
frequently called a “total pressure pick-up” since it receives the effects of
both static pressure and velocity pressure.
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Air Velocity
Because accurate readings cannot be taken in a turbulent air
stream, the Pitot tube should be inserted at least 81⁄2 duct diameters
downstream from elbows, bends or other obstructions which cause
turbulence. To ensure the most precise measurements, straightening vanes should be located 5 duct diameters upstream from the
Pitot tube.
How to Take Traverse Readings
In practical situations, the velocity of the air stream is not uniform
across the cross section of a duct. Friction slows the air moving
close to the walls, so the velocity is greater in the center of the duct.
In Figure 2, note that separate static connections (A) and total
pressure connections (B) can be connected simultaneously across a
manometer (C). Since the static pressure is applied to both sides of
the manometer, its effect is cancelled out and the manometer indicates only the velocity pressure.
To obtain the average total velocity in ducts of 4" diameter or larger, a series of velocity pressure readings must be taken at points of
equal area. A formal pattern of sensing points across the duct cross
section is recommended. These are known as traverse readings.
Figure 4 shows recommended Pitot tube locations for traversing
round and rectangular ducts.
To translate velocity pressure into actual velocity requires either
mathematical calculation, reference to charts or curves, or prior
calibration of the manometer to directly show velocity. In practice
this type of measurement is usually made with a Pitot tube which
incorporates both static and total pressure sensors in a single unit.
Essentially, a Pitot tube consists of an impact tube (which receives
total pressure input) fastened concentrically inside a second tube of
slightly larger diameter which receives static pressure input from
radial sensing holes around the tip. The air space between the
inner and outer tubes permits transfer of pressure from the sensing holes to the static pressure connection at the opposite end of
the Pitot tube and then, through connecting tubing, to the low or
negative pressure side of a manometer. When the total pressure
tube is connected to the high pressure side of the manometer, velocity pressure is indicated directly. See Figure 3.
In round ducts, velocity pressure readings should be taken at centers of equal concentric areas. At least 20 readings should be taken
along two diameters. In rectangular ducts, a minimum of 16 and a
maximum of 64 readings are taken at centers of equal rectangular
areas. Actual velocities for each area are calculated from individual
velocity pressure readings. This allows the readings and velocities
to be inspected for errors or inconsistencies. The velocities are
then averaged.
By taking Pitot tube readings with extreme care, air velocity can
be determined within an accuracy of ±2%. For maximum accuracy,
the following precautions should be observed:
Since the Pitot tube is a primary standard device used to calibrate
all other air velocity measuring devices, it is important that great
care be taken in its design and fabrication. In modern Pitot tubes,
proper nose or tip design — along with sufficient distance between
nose, static pressure taps and stem — will minimize turbulence and
interference. This allows use without correction or calibration factors. All Dwyer Pitot tubes are built to AMCA and ASHRAE standards and have unity calibration factors to assure accuracy.
1. Duct diameter should be at least 30 times dia. of Pitot tube.
2. Locate the Pitot tube in a duct section providing 81⁄2 or more
duct diameters upstream and 5 or more diameters down
stream of Pitot tube free of elbows, size changes or obstructions.
3. Provide an egg-crate type of flow straightener 5 duct diameters
upstream of Pitot tube.
4. Make a complete, accurate traverse.
To insure accurate velocity pressure readings, the Pitot tube tip
must be pointed directly into (parallel with) the air stream. As the
Pitot tube tip is parallel with the static pressure outlet tube, the latter can be used as a pointer to align the tip properly. When the Pitot
tube is correctly aligned, the pressure indication will be maximum.
In small ducts or where traverse operations are otherwise impossible, an accuracy of ±5% can frequently be achieved by placing
Pitot tube in center of duct. Determine velocity from the reading,
then multiply by 0.9 for an approximate average.
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Calculating air velocity from velocity pressure
Air Velocity
Manometers for use with a Pitot tube are offered in a choice of two
scale types. Some are made specifically for air velocity measurement and are calibrated directly in feet per minute. They are correct for standard air conditions: i.e. air density of .075 lbs. per
cubic foot which corresponds to dry air at 70°F, barometric pressure of 29.92 inches Hg. To correct the velocity reading for other
than standard air conditions, the actual air density must be known.
It may be calculated if relative humidity, temperature and barometric pressure are known.
Most manometer scales are calibrated in inches of water. Using
readings from such an instrument, the air velocity may be calculated using the basic formula:
hv
d
V=1096.7 公
公h for .075 lb/ft dry air
{=4004.4
}
@ 70°F, 29.92 in. Hg Baro.
v
3
For example, assuming a manufacturer’s specification for a filter,
coil, etc:
Where:
V = Velocity in feet per minute.
hv = Velocity pressure in inches of water.
d = Density of air in pounds per cubic foot.
To determine dry air density, use the formula:
Given Flow Q (ft3/min.) = at differential “h”
(inches w.c.)
P
B
d=1.325
Where:
T
d = Air density in pounds per cubic foot.
B = Barometric (or absolute) static pressure
in inches of mercury.
T = Absolute temperature (indicated temperature in
°F plus 460°).
P
}
{
With dry air at 29.9 inches mercury, air velocity can be read directly from curves on the following page. For partially or fully saturated air a further correction is required. To save time when
converting velocity pressure into air velocity, the Dwyer Air Velocity Calculator may be used. A simple slide rule, it provides for all
the factors needed to calculate air velocity quickly and accurately.
It is included as an accessory with each Dwyer Pitot tube.
To use the Dwyer Calculator:
1. Set relative humidity on scale provided. On scale opposite
known dry bulb temperature, read correction factor.
2. Set temperature under barometric pressure scale. Read density
of air over correction factor established in 1 (above) .
3. On the other side of calculator, set air density reading just
obtained on the scale provided.
4. Under Pitot tube reading (velocity pressure, inches of water)
read air velocity, feet per minute.
Determining Volume Flow
Once the average air velocity is known, the air flow rate in cubic
feet per minute is easily computed using the formula:
Q= AV
Where: Q= Quantity of flow in cubic feet per minute.
A=Cross sectional area of duct in square feet.
V=Average velocity in feet per minute.
To determine flow at other differentials the formula is:
hn
Qn (other flows) = Q 公 h
Where: Q = Quantity of flow in cubic feet per minute
h= differential in inches water column
hn = differential (other flow conditions)
Other Devices for Measuring Air Velocity
A wide variety of devices are commercially available for measuring
air velocities. These include hot wire anemometers for low air velocities, rotating and swinging vane anemometers and variable
area flowmeters.
The Dwyer No. 460 Air Meter is one of the most popular and economical variable area flowmeter type anemometers. Quick and
easy to use, it is a portable instrument calibrated to provide a direct reading of air velocity.
A second scale is provided on the other side of the meter to read
static pressure in inches w.c. The 460 Air Meter is widely used to
determine air velocity and flow in ducts, and from supply and return grilles and diffusers. Two scale ranges are provided (high and
low) with calibrations in both f.p.m. and inches w.c.
To Check Accuracy
Use only devices of certified accuracy. All anemometers and to a
lesser extent portable manometers should be checked regularly
against a primary standard such as a hook gage or high quality micromanometer. If in doubt return your Dwyer instrument to the
factory for a complete calibration check at no charge.
Determining Air Volume by Calibrated Resistance
Manufacturers of air filters, cooling and condenser coils and similar
equipment often publish data from which approximate air flow can
be determined. It is characteristic of such equipment to cause a
pressure drop which varies proportionately to the square of the
flow rate. Figure 5 shows a typical filter and a curve for air flow versus resistance. Since it is plotted on logarithmic paper, it appears as
a straight line. On this curve, a clean filter which causes a pressure
drop of .50 inches w.c. would indicate a flow of 2,000 c.f.m.
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199
AIR VELOCITY IN FEET PER MINUTE
GAGE READING WITH PITOT TUBE (VELOCITY PRESSURE) IN INCHES OF WATER
AIR VELOCITY IN FEET PER MINUTE
Air Velocity
AIR VELOCITY FLOW CHARTS
GAGE READING WITH PITOT TUBE (VELOCITY PRESSURE) IN INCHES OF WATER
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Air Velocity Meters
Series
400
Kit includes No. 400 Air Meter and all accessories:
MODELS
Series 400 Air Velocity Meters with Combination Inclined/Vertical Scales
Rated for total pressures to 100 psig (6.89 bar); temperatures to 150°F (65°C)
Minor Div.; Range, in. w.c.
Model
Number
400-5-S-Kit
400-5-L-Kit
400-5-gage
400-10-Kit
400-10-gage
400-23-Kit
400-23-gage
Range
in. w.c.
0-5
0-5
0-5
0-10
0-10
0-23
0-23
Velocity
FPM
400-9000
400-9000
400-9000
400-12,600
400-12,600
400-19,200
400-19,200
Inclined
Scale
.01, 0-1.0
.01, 0-1.0
.01, 0-1.0
.01, 0-1.0
.01, 0-1.0
.02, 0-2.3
.02, 0-2.3
Vertical
Scale
.10, 1-5
.10, 1-5
.10, 1-5
.10, 1-10
.10, 1-10
.20, 2.3-23
.20, 2.3-23
Pitot
Tube
8 in.
18 in.
none
18 in.
none
18 in.
none
Accessories:
Stainless Steel Calibrated Pitot Tube — (18" Model 160-18 standard,
other lengths available — see price list). Graduated both sides in inches to show insertion depth for easy accurate duct traverse. Clean, burrfree static holes. Suitable for temperatures up to 1500°F.
Rubber Tubing with Connectors — Two coils of 3⁄16" with metal terminal
tubes.
Magneclip side mountings. Attach meter instantly to steel duct or surface.
Red Gage Oil—Spare bottle. For occasional refilling. Supply sufficient
for several years of normal use. (Blue Gage Oil furnished with Model
400-23).
Instruction Card — Easy to read and understand. Plastic laminated,
wipes clean.
Dwyer Air Velocity Calculator — Slide rule eliminates tedious calculations — easily compensates for temperature, humidity and barometric
pressure variations.
Steel Carrying Case — Professional quality. Welded seams, enamel finish. Hinged top locks with hasps. Foam plastic lined and fitted to protect meter and accessories. Size* 111⁄2"H x 201⁄4"W x 11⁄2"D. Only 131⁄4 lbs.
with equipment .
*No. 400-5-S is 11 x 111⁄2 x 21⁄2". Contact factory
for extra long steel cases for use with longer
Pitot tubes.
Model No. 400-10 Air Velocity Meter
Measure both pressure and air velocity
Read the red figures directly in feet per minute of velocity —
from 400 to 10,000 f.p.m. No conversion tables needed for
air at standard conditions. Read the black figures in inches
of water column air pressure — from 0 to 10" w.c.
Our most popular precision air velocity instrument, the No. 400 is
used to balance air conditioning systems, measure pressure drop
across filters, and test fan and blower discharge and inlet pressures, as well as air velocity in ducts. It offers the convenience of a
dual purpose instrument — plus high accuracy on easy-to-read
scales. A versatile, all around manometer for the air conditioning
and balancing contractor or industrial plant.
CALL TO ORDER:
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Complete Kit, Model 400-10
Left — Model No. 400-5 Air
Meter, 0-5" W.C., 400-9000
f.p.m.
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Air Velocity
Combination Inclined/Vertical Manometer — 3 models (see table).
Dwyer Durablock® precision machined solid acrylic plastic construction is virtually indestructible. Has both inclined section for high accuracy and vertical section for extended range. Pressure marked in
black, Velocity in red figures. Easy to read — no reference tables needed. Has screw leveling adjustment and ground glass bubble level.
Series
100 AV
®
Durablock Air Velocity Gage Kits
Suitable for Total Pressures to 100 psig (6.89 bar), Temperatures to 150°F (65.6°C)
Complete Air Velocity Kits include:
Air Velocity
Dwyer Inclined Manometer described below, stainless steel Pitot tube
(12" with Models 102-AV & 115-AV, 24" with Model 125-AV and telescoping 36" with Model 115T-AV), two 9' lengths of rubber tubing with
connectors, extra red gage oil, instruction card H-7, Bulletin H-11,
magnetic mounting clips (see bottom of page), air velocity calculator
slide rule and carrying case (plastic with models 102-AV, 115-AV and
115T-AV, steel with model 125-AV).
MODELS
Range,
Inches of
Water
Velocity,
Feet per
Minute
102-AV .20-0-2.0
115-AV .05-0-.25
115T-AV .05-0-.25
0-1.0
125-AV
400-5500
400-2000
400-2000
300-4000
Model
No.
Complete Kit, Model 115-AV
Designed to measure air velocity, static pressure, vacuum or differential pressure, where the additional range of the 400 Series gages is not
required. Series 100 Gages offer superb accuracy combined with
portability. In Dwyer’s Durablock® precision machined solid acrylic
plastic construction, the wells and inclined bore are machined to tolerances of ±.0002".
Model
No.
Carrying Case
Dimensions
102-AV
115-AV
115T-AV
125-AV
131⁄2 X10 X 21⁄2
131⁄2 X10 X 21⁄2
131⁄2 X10 X 21⁄2
9 X 26 X 15⁄8
Minor
Scale
Scale
Divisions Length
.02
.005
.005
.005
81⁄4 in.
6 in.
6 in.
20 in.
Model No. 115-AV
Dimensions,
In Inches
A
B
111⁄2
91⁄2
91⁄2
233⁄4
45⁄16
31⁄16
31⁄16
4
Pitot Tube
Model–Length
166-12
166-12
166T
160-24
12 in.
12 in.
36 in.
24 in.
Model No. 102-AV
Design and service features:
Plastic Body — A 1" thick solid acrylic block, virtually unbreakable.
It is stable and free of the danger of distortion.
Drilled Bore — Permanently free of bends — never requires recalibration due to distortion.
Reflective Chrome Finish Scales — Easily eliminate parallax errors in reading. Adjustable, with thumbscrew locking for easy zeroing.
(Model 125 AV uses screw plunger to adjust zero setting).
Red Gage Oil — .826 specific gravity. Forms a well-shaped, easy-toread meniscus — the result of high wetability.
Leveling Adjustment — Screw allows quick, accurate leveling. Integral ground glass bubble level provides ready reference.
Model No. 125-AV
Standard Equipment for Dwyer Solid Plastic Portable Manometers
Magneclips for Instant Mounting on Any Steel Surface — These
mounting magnets are supplied as part of each Dwyer Durablock® solid
plastic portable gage. Just touch magnets to any vertical steel surface —
gage “stays put” until manually detached.
Dwyer Air Velocity Calculator — Slide rule easily calculates air velocity and
compensates for temperature and pressure variations. Shows velocity pressure from .01" to 10" water column, velocities from 400 to 20,000 f.p.m., etc.
Furnished as a standard accessory with all Dwyer Durablock® solid plastic air
velocity gages.
Molded Nylon Rapid Shut-Off Tubing Connectors — An exclusive
Dwyer feature. Leakproof, corrosion-proof, virtually unbreakable. Requires
just one turn to open or close. O-rings prevent leaks and provide positive
shut-off. Body is easily removed to add fluid or to clean.
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Foam-Lined Carrying Cases — Most Dwyer portable air velocity gages
are furnished with cases of high density polyethylene. Model No. 125-AV has
a steel case. Cases have a resilient polyurethane plastic foam lining to protect and cushion gage and accessories.
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Mark II
Molded Plastic Air Velocity Meters
Low in Cost – Direct Reading Scales Offer 3% Accuracy –
For Portable or Stationary Applications
Air Velocity
MODEL 40-AV – Shown with standard swing-out stand and
leveling screw installed.
MODEL 27
MODELS
Construction and installation features:
Construction is simple with virtually indestructible molded white
styrene-acrylonitrile housing, indicating tube and fluid wells, molded
ABS knobs and zero adjust plunger, shock mounted glass level vial and
leak proof “O”ring seals. Scales are lithograph printed on aluminum
and epoxy coated.
For stationary applications, the Mark II air velocity meters can be easily mounted on any vertical surface with the two screws provided. A
built in spirit level simplifies leveling.
Just fill the reservoir, adjust fluid level to zero, connect the pitot tube,
and it is ready for operation. For portable applications, the Model A-612
portable stand is available for Models 27 and 28.
A molded plastic swing-out stand and leveling screw for user installation are provided with Models 40-1-AV and 41-2-AV which also feature
rapid shutoff tubing connectors and built-in over pressure traps.
Additional standard accessories include plastic connection tubing,
mounting screws, 3⁄4 oz. bottle of indicating fluid and instructions. Metric ranges are also available.
OEM Specials — All models of the Dwyer Mark II molded plastic air
velocity meters can be supplied with your logo or special scale in OEM
quantities. Consult factory for details.
See also our Digital Manometers and Pitot tubes.
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Model Number
Range
Mark II 27
Mark II 28
Mark II 40-1-AV
Mark II 41-2-AV
Mark II 40-250 Pa-AV
0-7,000 fpm
0-10,500 fpm
0-4,200 fpm
0-6,300 fpm
0-21 mps
Pitot tube not included with models above.
Accessories
A-612 Portable Stand (27,28)
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Series
160
Stainless
Steel
Pitot
Tubes
ASME Design Meets AMCA and ASHRAE Codes
8, 12, 18, 24, 36, 48 or 60
5/16 DIA.
Air Velocity
5
STATIC PRESSURE
8-0.04 DIA. HOLES
EQUALLY SPACED
2-1/2
No. A-158 Split Flange Mounting can be added to
any Dwyer No. 160 Standard Pitot Tube. Cadmium
plated steel. Gasket is pattern for mounting holes. Secure flange loosely to tube, adjust tube depth and tighten screws. Gasket of 1⁄16" Neoprene fits tightly around
tube and against duct for leak-proof seal. Nuts, washers included.
No. A-159 Mounting Gland — No. A-159 Mounting
Gland — Versatile adapter slips on any Series 160,
5/16˝ standard Pitot tube made after Dec. 1990. Twopart stainless steel fitting slides over tube and provides
permanent, secure mounting. Where duct interior is accessible, use the washers and jam nut supplied. For
blind applications or in thicker materials, use model A156 flange mounting plate. Once tube is adjusted to
proper depth and angle, tighten smaller hex bushing to
lock position. Graphite bushing inside assures leakproof seal even at higher temperatures. Teflon® bushing
also available. NOTE: For full insertion with this fitting,
order next longer Pitot tube.
1/2
STATIC PRESSURE
8-0.04 DIA. HOLES
EQUALLY SPACED
2-1/2
TOTAL PRESSURE
1/8 DIA. HOLE
3-5/8
160 Series
Longer
Models with
Stiffener
5/16
DIA.
2-1/2
STATIC PRESSURE
CONNECTION
3/4 SCHEDULE 40
PIPE BY CUSTOMER
1/2
NPT
STATIC PRESSURE
8-0.04 DIA. HOLES
EQUALLY SPACED
1/4 DIA.
6
3/4 - 1/2 REDUCING
COUPLING BY CUSTOMER
Model 160-U
NOTE: CUSTOMER MUST SUPPLY 1/4" TUBING
TO THE STATIC AND TOTAL PRESSURE
CONNECTIONS TUBING AND CONNECTIONS
WILL FIT INSIDE STANDARD SCHEDULE 40 PIPE.
TOTAL PRESSURE
1/8 DIA. HOLE
6-1/2 OR 12-1/2
MODEL 166 - 2"
MODEL 167 - 1"
STATIC PRESSURE
CONNECTION 1/4
COMPRESSION FITTING
TOTAL
PRESSURE
CONNECTION
1/4
COMPRESSION
FITTING
3
36-5/8
5
TOTAL
PRESSURE
CONNECTION
1/4 DIA.
3/4 DIA. FOR 96 OR 120
1 DIA. FOR 168 OR 216
5
1-1/2
1/2
.120 DIA.
STATIC PRESSURE
8-.020 DIA. HOLES
EQUALLY SPACED
166/167
Series
MODEL 166 - 1"
MODEL 167 - 1/2"
1/2
.120 DIA.
TOTAL PRESSURE
.047 DIA. HOLE
TOTAL
PRESSURE
CONNECTION
.120
1/4 DIA.
DIA.
2-1/2
1/4 DIA.
1/2
STATIC PRESSURE
CONNECTION
MODELS
Standard 5⁄16" Dia.
A-159 Mounting Gland is used for
both duct mounting and flange
mounting. To flange mount, the
A-159 must be used with the
A-156 flange mounting plate.
Model
Number
Longer Length w/ Stiffener
Insertion
Length
Model
Number
Insertion
Length
96"
160-96
160-8
8"
120"
160-120
160-12
12"
168"
160-168
160-18
18"
216"
160-216
160-24
24"
Pocket Size 1⁄8" Dia.
160-36
36"
160-48
48"
6"
166-6
160-60
60"
12"
166-12
3
Universal Model for ⁄4" Pipe
6"
167-6
12"
167-12
160-U
*
Accessories & Options
A-156 Flange Mounting
Compression Fitting mounting option for
Plate 1/2˝ female NPT
166/167 Series. Add -CF suffix (166-6-CF).
A-158 Split Flange
Add to prices above
A-159 Mounting Gland
A-397 Step Drill
A-159 Duct
A-156 Flange
Mounting Gland
Mounting Plate
with 1/2˝ male NPT with 1/2˝ female NPT
No. A-397 Step Drill. For fast, convenient installation
of Pitot tubes in sheet metal ducts. No center punch
needed; automatic de-burring. Drills six sizes from 3⁄16"1
⁄2" in 1⁄16" increments.
1/4 DIA.
STATIC PRESSURE
CONNECTION
96, 120, 168 OR 216
1
A-158 Split Flange
Mounting
ACCESSORIES
3-5/8
160 Series
TOTAL PRESSURE
1/8 DIA. HOLE
Standard Model 160 Pitot Tube
Ideal for use with our precision manometers and air velocity gages,
Dwyer Pitot Tubes are constructed from corrosion resistant stainless
steel for a lifetime of service. ASME design meets AMCA and
ASHRAE specifications for maximum accuracy over a wide variety of
flow conditions. No correction factors required as ASHRAE tip design
yields a calibration factor of 1. ASHRAE design needs no calibration!
Permanent, stamped insertion depth graduations on sides of 160 series facilitate accurate positioning. Static pressure port is parallel to
sensing tube allowing quick, easy alignment of tube with air flow. Low
sensitivity to misalignment gives accurate reading even when tube is
misaligned up to 15 degrees. Various standard sizes are available for
use in ducts as small as 4" dia. or as large as 36 ft. dia. A universal
model fits user supplied 3⁄4" schedule 40 (standard) pipe in any length.
Several convenient mounting options are available for permanent installations.
• No calibration needed.
• Precisely located, burr-free static pressure holes.
• Hemispherical tip design, best for accuracy if imperfectly
aligned and nearly impossible to damage.
• Long lasting 304 SS construction.
• Silver soldered connections for leak-proof operation.
• ASME design meets AMCA and ASHRAE specifications.
• Coefficient of “1.”
• 5⁄16" models rated to 1500°F.
• Extended static connection helps guide tip within recommended 15°
of air flow direction.
• Inch graduations on sides of 160 series to quickly determine
exact insertion depth.
• Dwyer Air Velocity Calculator, direct reading
flow charts and instructions included.
• Use 1⁄8" models in ducts as small as 4", 5⁄16" models in
ducts 10" or larger.
• Optional mounting gland or split flange make
permanent installation fast and simple.
1/2
TOTAL PRESSURE
CONNECTION
1/4 DIA.
A-397 Step Drill
*Universal model for permanent installation and connection to metal tubing. Make any length Pitot
tube with 3⁄4" schedule 40 pipe, 3⁄4" to 1⁄2" reducing bushing and 1⁄4" metal tubing.
See also: Ellipsoidals “S” Type Pitot Tubes - page 205
204
VISIT OUR WEBSITES:
www.dwyer-inst.com
•
www.dwyer-inst.co.uk
•
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Ellipsoidal Tip Pitot Tube
Series
160E
Designed to Meet British Standard 1042
• Ellipsoidal tip design for improved accuracy, 1.0 coefficient
• 304 SS construction adds strength, resists corrosion
• Adjustable depth indicators for fast, consistent traverses
• Alignment indicator helps keep tip parallel to flow
Series
160S
Air Velocity
Series 160E Pitot Tubes are widely used in the U.K. and Europe for
applications demanding high accuracy when measuring the flow of air
or other compatible gases. Precision crafted tip configuration allows air
to pass smoothly with minimum turbulence for consistent, reliable readings. Exterior indicator arm is aligned parallel to the 5 in. (13 cm) sensing tip so you always know that unit is properly positioned inside duct.
Sliding depth indicators grip firmly to ensure uniform insertion — critical when making multiple measurements as part of a complete traverse; the best way to determine average velocity. Total and static
pressure taps are 1⁄4" (6 mm), permanently silver soldered to the connection block, leak-proof and durable. Seven fixed length sizes are offered plus a universal model which attaches to any length of 3⁄4" sch. 40
pipe. See 160-U drawing.
MODELS
Model
Number
160E-00
160E-01
160E-02
160E-03
160E-04
160E-05
160E-06
160E-U
Insertion
in Meters
0.2
0.3
0.48
0.8
1.0
1.22
1.52
Handy A-532 Slide Chart speeds air velocity
calculations. All plastic, stays clean for years.
Included with each Pitot tube.
“S” Type Stainless Steel Pitot Tubes
Large, Open Tip Design Resists Fouling; Optional Permanent Mount Models
• Meets EPA specification 40 CFR (ch. 1)
• Long lasting, welded stainless steel construction
• 1⁄8" female NPT connections, permanently welded
• Rated to 1500°F (815°C)
• 0.84 flow coefficient
160S-18
Series 160S Pitot Tubes are designed specifically for flow measurement of dirty, particulate laden air or gas streams typical in smoke
stack and other environmental testing. Large 5⁄16" dia. stainless steel
tubing resists plugging under harsh, sooty conditions which quickly
block conventional flow sensors. Total and static pressure tubes are
precisely aligned and welded together every six inches for maximum
accuracy, strength and long term durability. Versatile 1⁄8" female NPT
connections easily adapt to any type of pipe or tubing. A pair of 1⁄8" NPT
to 3⁄16" I.D. tubing adapters is included plus a handy molded vinyl cap to
protect tip when not in use. Supplied with complete instructions.
Model
166T
160S-18PM
MODELS
Model
Number
160S-18
160S-24
160S-36
160S-48
160S-60
160S-72
Perm. Mtg.
Model No.
160S-18PM
160S-24PM
160S-36PM
160S-48PM
160S-60PM
160S-72PM
Insertion
In Inches
18
24
36
48
60
72
Permanent Mounting
(PM) models include 1 inch
dia. welded stainless steel
sleeve and adjustable compression fitting with 1 inch
male NPT mounting treads.
Adjust depth, lock in place.
Telescoping Stainless Steel Pitot Tube
Adjustable Design Extends Insertion Length to 36 Inches
The Model 166T Telescoping Pitot tube is a unique air flow sensor
which can quickly and easily be adjusted for any duct insertion length from
11.5 to 36 inches (29.2 to 91.4 cm). Now, this single compact unit can
replace up to five conventional fixed length Pitot tubes. For even greater
convenience, it is securely protected by a custom fitted polyethylene carrying case. Telescoping sections lock in place as they are extended,
enabling use of the handle grip to gauge proper alignment of the tip within the airstream. Stainless steel construction resists corrosion.
Hemispherical tip has 1.0 flow coefficient, is 1/8˝ dia. (3.2 mm). Largest section is 3/8˝ (9.5 mm). Weight (with case) 1 lb, 9 oz (709 g). Case: 12.5 ⫻ 6.25
⫻ 1.75 in.
Model 166T
CALL TO ORDER:
U.S. Phone 219 879-8000
•
U.K. Phone (+44) (0)1494-461707
•
Asia Pacific Phone 61 2 4272-2055
205
Series
DS
In-Line
Flow
Sensors
Use with the Dwyer Differential Pressure Gages or Transmitters
1-15/16 [49.21]
Valves — Standard, brass with
Teflon® seat and Buna-N O-ring
Air Velocity
1-5/8
[41.27] TYP.
Nameplate — Stainless steel permanently
attached with split ring.
Includes complete size
and model information.
1-3/4
[44.45]
1-11/16
[42.86] APPROX.
Head — Machined stainless steel.
1-7/16
[36.52]
1/4 NPT
Packing gland — Parker CPI brass
compression fitting.
5/16
[7.938]
Sensor tube — 304 SS.
Sensing ports — Multiple upstream
and downstream ports sized and positioned to provide effective accurate
pressure averaging, even at lower
velocities.
1/16 [1.57] CLEARANCE
Dwyer Flow Sensors are averaging Pitot tubes that provide accurate and convenient flow rate sensing for schedule 40 pipe. When purchased with a Dwyer Capsuhelic® differential pressure gage of
appropriate range, the result is a flow indicating system delivered off
the shelf at an economical price.
Pitot tubes have been used in flow measurement for years. Conventional pitot tubes sense velocity pressure at only one point in the flowing stream. Therefore, a series of measurements must be taken across
the stream to obtain a meaningful average flow rate. The Dwyer flow
sensor eliminates the need for “traversing” the flowing stream because of its multiple sensing points and built-in averaging capability.
Select model with suffix which matches pipe size
DS-300-1"
DS-300-11⁄4"
DS-300-11⁄2"
DS-300-2"
DS-300-21⁄2"
DS-300-3"
DS-300-4"
DS-300-6"
DS-300-8"
DS-300-10"
Dwyer Series DS-300 flow sensors are designed to be inserted in
the pipeline through a compression fitting. They are furnished with
instrument shut-off valves on both pressure connections. Valves are
fitted with 8" female NPT connections. Accessories include adapters
with 4" SAE 45° flared ends compatible with hoses supplied with
the Model A-471 Portable Capsuhelic® kit. Standard valves are rated
at 200 psig (13.7 bar) and 200°F (93.3°C). Where valves are not required, they can be omitted at reduced cost. Series DS-300 flow sensors are available for pipe sizes from 1" to 10".
DS-400-6"
DS-400-8"
DS-400-10"
DS-400-12"
DS-400-14"
DS-400-16"
DS-400-18"
DS-400-20"
DS-400-24"
DS-400 Averaging Flow Sensors are quality constructed from extra
strong w" dia. stainless steel to resist increased forces encountered at higher flow rates with both air and water. This extra strength also allows them
to be made in longer insertion lengths up to 24 inches (61 cm). All models
include convenient and quick-acting quarter-turn ball valves to isolate the
sensor for zeroing. Process connections to the valve assembly are 8" female NPT. A pair of 8" NPT ⫻ 4" SAE 45° flared adapters are included,
compatible with hoses used in the Model A-471 Portable Capsuhelic® Gage
Kit. Supplied solid brass mounting adapter has a w" dia. compression fitting to lock in required insertion length and a w" male NPT thread for
mounting in a thred-o-let (not included).
Options and Accessories
206
VISIT OUR WEBSITES:
www.dwyer-inst.com
A-160 Thredolet,3⁄8" NPT, forged steel, 3000 psi
A-161 Brass Bushing, 1⁄4" x 3⁄8"
(DS-300) To order, add suffix -LVdeduct
b Items subject to Schedule B discounts
•
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•
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How To Order
Merely determine the pipe size into which the flow sensor will be
mounted and designate the size as a suffix to Model DS-300. For example, a flow sensor to be mounted in a 2" pipe would be a Model No.
DS-300-2".
Large 3/4 Inch Diameter for Extra Strength in Lengths
to 24 Inches
2-1/16
[52.40]
For non-critical water and air flow monitoring applications, the chart
below can be utilized for ordering a stock Capsuhelic® differential pressure gage for use with the DS-300 flow sensor. Simply locate the maximum flow rate for the media being measured under the appropriate
pipe size and read the Capsuhelic® gage range in inches of water column to the left. The DS-300 sensor is supplied with installation and operating instructions, Bulletin F-50. It also includes complete flow
conversion information for the three media conditions shown in the
chart below. This information enables the user to create a complete differential pressure to flow rate conversion table for the sensor and differential pressure gage employed. Both the Dwyer Capsuhelic® gage
and flow sensor feature excellent repeatability so, once the desired
flow rate is determined, deviation from that flow in quantitative measure can be easily determined. You may wish to order the adjustable
signal flag option for the Capsuhelic® gage to provide an easily identified reference point for the proper flow.
1-5/8 [41.28] TYP.
DS-400
MEDIA @ 70°F
1/16 [1.60]
GAP UP TO 12 PIPE
1/8 [3.175]
GAP 14 PIPE AND UP
72-700416-00
DS-400
FULL RANGE FLOWS BY PIPE SIZE (APPROXIMATE)
1"
11⁄4"
11⁄2"
2"
21⁄2"
2
Water (GPM)
Air @ 14.7 PSIA (SCFM)
Air @ 100 PSIG (SCFM)
4.8
19.0
50.0
8.3
33.0
90.5
11.5
42.0
120.0
20.5
65.0
210.0
30
113
325
5
Water (GPM)
Air @ 14.7 PSIA (SCFM)
Air @ 100 PSIG (SCFM)
7.7
30.0
83.0
14.0
51.0
142.0
18.0
66.0
190.0
34.0
118.0
340.0
10
Water (GPM)
Air @ 14.7 PSIA (SCFM)
Air @ 100 PSIG (SCFM)
11.0
41.0
120.0
19.0
72.0
205.0
25.5
93.0
275.0
25
Water (GPM)
Air @ 14.7 PSIA (SCFM)
Air @ 100 PSIG (SCFM)
18.0
63.0
185.0
32.0
112.0
325.0
50
Water (GPM)
Air @ 14.7 PSIA (SCFM)
Air @ 100 PSIG (SCFM)
25.0
90.0
260.0
100
Water (GPM)
Air @ 14.7 PSIA (SCFM)
Air @ 100 PSIG (SCFM)
36.5
135.0
370.0
6"
8"
49
183
510
86
330
920
205
760
2050
350
1340
3600
560
2130
6000
47
178
610
78
289
820
138
510
1600
320
1200
3300
560
2150
5700
890
3400
10000
45.5
163.0
470.0
67
250
740
110
410
1100
195
725
2000
450
1690
4600
800
3040
8100
1260
4860
15000
40.5
155.0
430.0
72.0
255.0
760.0
108
390
1200
173
640
1800
310
1130
3300
720
2630
7200
1250
4860
13000
2000
7700
22000
44.0
161.0
460.0
57.5
205.0
620.0
100.0
360.0
1050.0
152
560
1700
247
900
2600
435
1600
4600
1000
3700
10000
1800
6400
18500
62.0
230.0
660.0
82.0
300.0
870.0
142.0
505.0
1500.0
220
800
2300
620
2290
6500
1500
5000
15000
Model A-471 Portable Kit
The Dwyer Series 4000 Capsuhelic® differential pressure gage is ideally
suited for use as a read-out device with the DS-300 Flow Sensors. The gage
may be used on system pressures of up to 500 psig even when the flow sensor differential pressure to be read is less than 0.5" w.c. With accuracy of ±3%
of full scale, the Capsuhelic® gage can be used in ambient temperatures from
32 to 200°F (0 to 93.3°C). Zero and range adjustments are made from outside
the gage. The standard gage with a die cast aluminum housing can be used
with the flow sensor for air or oil applications. For water flow measurements,
the optional forged brass housing should be specified. The Capsuhelic® gage
may be panel or surface mounted and permanently plumbed to the flow
sensor if desired. The optional A-610 pipe mounting bracket allows the gage
to be easily attached to any 14" - 2" horizontal or vertical pipe.
CALL TO ORDER:
3-5/8 [92.08] APPROX.
3/4 [19.05]
DIA.
Capsuhelic® gages with special ranges and/or direct reading scales in
appropriate flow units are available on special order for more critical
applications. Customer supplied data for the full scale flow (quantity
and units) is required along with the differential pressure reading at
that full flow figure. Prior to ordering a special Capsuhelic® differential pressure gage for flow read-out, we recommend you request Bulletin F-50 to obtain complete data on converting flow rates of various
media to the sensor differential pressure output. With this bulletin
and after making a few simple calculations, the exact range gage required can easily be determined.
GAGE
RANGE
(IN. W.C.)
2-1/8 [53.98]
U.S. Phone 219 879-8000
•
3"
350
1290
3600
4"
10"
For portable operation, the A-471
Capsuhelic® Portable Gage Kit is
available complete with tough
polypropylene carrying case,
mounting bracket, 3-way manifold
valve, two 10' high pressure hoses,
and all necessary fittings. See
pages 6 and 7 for complete
information on the
Capsuhelic® gage.
U.K. Phone (+44) (0)1494-461707
CAPSUHELIC® GAGE SHOWN
INSTALLED IN A-471 PORTABLE KIT
•
Asia Pacific Phone 61 2 4272-2055
207
Air Velocity
LP
HP
Series
471
Digital Thermo-Anemometer
Air Velocity
Four Field Selectable Ranges from 500 to 15,000 FPM
Model 471-3 w/
Telescoping Bendable Tip
Model 471-2 w/
Telescopic Probe
Model 471-1
The Series 471 Digital Thermo Anemometers are versatile
dual function instruments that quickly and easily measure air velocity in four field selectable ranges, in either feet per minute or
meters per second, plus air temperature in °F or °C. High contrast
LCD display shows both range selected and present velocity. Convenient backlight provides perfect visibility in low light conditions.
Light automatically shuts off after 2-1/2 minutes to prolong battery life. Low battery warning is included.
Stainless steel probe with comfortable hand grip is etched with insertion depth marks from 0-8 inches and 0-20 cm on the Model 4711. When fully extended, the probe length on models 471-2 and
471-3 reach 33 inches (83 cm). Model 471-3 features a telescoping
bendable probe for easy access in hard-to-reach locations.
Extruded aluminum housing fully protects electronics, yet is lightweight and comfortable to hold even when taking multiple readings as part of duct traverses. An integral sliding cover protects
sensors when not in use.
Standard accessories are 9 volt alkaline battery, wrist strap, custom fitted carrying case and step drill for making duct holes from
3/16˝ to 1/2˝.
SPECIFICATIONS
AIR VELOCITY SPECIFICATIONS:
Service: Air.
Range: Field Selectable 0-500, 0-1500, 0-5000, 0-15000 FPM (see
chart for Metric Conversions).
Accuracy: Depending on range (See chart) @ 59 to 86°F (15 to
30°C). Outside this range add 0.11% per °F (0.2% per °C).
Temperature Limits: Probe: 0 to 200°F (-18 to 100°C).
Ambient: 32 to 104°F (0 to 40°C).
Display: 4-1/2 Digit 0.4˝ High.
Resolution: 1 FPM / 0.1 MPS.
Response Time: 15 Seconds.
Power Requirements: 9 volt alkaline battery, included.
Probe: 5/16˝ (8.13 mm) diameter probe with integral hand grip and 6
ft. (15.2 cm) coiled cord. Length of probe: Model 471- 1=10˝ (25.4
cm); Models 471-2 and 471-3= 33˝ (83 cm) extended.
Weight: 12 oz (340 g).
TEMPERATURE SPECIFICATIONS:
Range: 0 to 200°F (-18 to 100°C).
Accuracy: ±2°F (1°C).
Temperature Limits: Probe: 0 to 200°F (-18 to 100°C).
Ambient: 32 to 104°F (0 to 40°C).
Display: 4-1/2 Digit 0.4˝ high.
Resolution: 0.1°.
Response Time: 30 Seconds.
Model 471-1 Digital Thermo Anemometer
includes battery, wrist strap, 6-step drill,
carrying case and instructions.
Note: Ranges are field selectable.
Range
Number
Velocity,
FPM
Velocity,
MPS
Accuracy
1
2
3
4
0-500
0-1500
0-5000
0-15000
0-3.0
0-7.0
0-30
0-75
±3% F.S.
±3% F.S.
±4% F.S.
±5% F.S.
208
VISIT OUR WEBSITES:
www.dwyer-inst.com
Model 471-2 Digital Thermo Anemometer
with telescoping probe includes battery,
wrist strap, 6-step drill, carrying case
and instructions.
Model 471-3 Digital Thermo Anemometer
with telescoping bendable tip includes
battery, wrist strap, 6-step drill,
carrying case and instructions.
•
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•
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Model
470-1
Handheld Thermal Anemometer
Measures Air Velocity to 6,000 Feet Per Minute, ±5% Accuracy, Low Cost
Wrist strap, coil
cord, simple
controls, and
easy-to-read
meter add up
to real operating
convenience.
Foam padded
polypropylene carrying
case, included with
the Model 470-1, has
complete operating
instructions inside
the cover.
Air Velocity
A slip-on cover protects the probe tip when
not in use and a depth insertion scale on the
probe body aids in making duct traverses.
Patent No, 4,537,068
The versatility of the Dwyer Model 470-1 Handheld Thermal
Anemometer makes it ideal for a wide range of air velocity measurements. Easy to carry and use in the field, the 470-1 can be used to balance
heating and air conditioning systems, measure velocity in HVAC ducts,
read fume and exhaust hood face velocities, as well as make wind speed
measurements associated with agricultural, forestry, highway and recreational activities. This low cost battery powered electronic instrument features an LED low-battery indicator and provides two switch selected air
velocity ranges of 0-600 FPM and 500-6000 FPM displayed on an easily read
analog meter.
Sophisticated temperature compensation circuitry maintains ±5% of full
range accuracy over an air stream temperature of 30 to 180°F.
Included are two 9 volt alkaline batteries, a wrist strap for the unit and a
durable polypropylene, foam-lined carrying case.
470-1, dual range, 0-600 and 500-6000 FPM
M470-1, dual range, 0-3 and 2-30 MPS
Model
VT120
SPECIFICATIONS
Service: Air.
Accuracy: ±5% F.S.
Temperature Limits: 32 to 180°F (0 to 82.2°C).
Ambient Temperature Limits: 32 to 160°F (0 to 71.1°C).
Display: Analog dial.
Response Time: 1 sec. for velocity change; 5 sec.
for temperature change (in air moving over 50 FPM).
Power Requirements: Two 9 volt alkaline batteries.
Probe: 316 SS, 10˝ long by 5 /16 ˝ diameter with 8˝ insertion depth
scale and tip shield.
Weight: 13 oz (unit only); 1 Ib 9 oz (in carrying case).
Integral Vane Thermo-Anemometer
Large 11/4 Dual Display, One Hand Operation
1.700
[43.18]
1.400
[35.56]
Simultaneously measure air velocity and temperature with the
Model VT120 Integral Vane Thermo-Anemometer. Easily view readings on
the large 1.25 (31.75 mm) dual display. User-selectable air velocity ranges
include ft/min, m/sec, mph, knots, and km/hr. Built-in thermistor records
ambient temperature in °F or °C. Model VT120 features include data hold
and record/recall minimum, maximum and average readings. Also, units
have the ability to record and average up to 2 hours of data while displaying the continuous running average. If desired, sleep mode automatically
shuts down the meter after 20 minutes of non-use. Model VT120 includes
hard carry case, one 9V battery, and instruction manual.
U.S. Phone 219 879-8000
Air Velocity Ranges: 80 to 5900
ft/min, 0.4 to 30 m/sec, 0.9 to 68
mph, 0.8 to 58 knots, 1.4 to 108
km/hr.
Temperature Range: 14 to 122°F
(-10 to 50°C).
Accuracy: Air velocity: ±3%, Temperature: ±1°F (±0.6°C).
Resolution: 1 ft/min, 0.01 m/sec, 0.1
mph, 0.1 knots, 0.1 km/hr, 0.1°F,
0.1°C.
THERMO-ANEMOMETER
RECORD
UNITS
SET-UP
SPECIFICATIONS
2.600
[66.04]
Temperature Sensor: Thermistor.
Temperature Limits: 14 to 122°F
(-10 to 50°C) max 80% RH.
Power Supply: One 9V battery.
Battery Life: 100 hours continuous
(with 20 min sleep mode enabled).
Display: Large 1.25 x 1.62˝ (37 x 42
mm) LCD, 9999 count.
Housing: ABS plastic.
Sensor Diameter: 2.87˝ (70 mm).
Weight: 1.5 lb (680 g).
Agency Approvals: CE.
APPLICATIONS
Model VT120 Integral Vane Thermo-Anemometer
Model VT120-N includes NIST certification
CALL TO ORDER:
VT 120
3.000
[76.20]
ON-OFF
HOLD
7.190
[182.63]
Air duct measurement and analysis, fume hood analysis, ionizer flow output monitoring, positive pressure reading in clean rooms, or ventilation
system inspection.
•
U.K. Phone (+44) (0)1494-461707
•
Asia Pacific Phone 61 2 4272-2055
209
Model
VT140
Vane Thermo-Anemometer
Simultaneously Displays Air Velocity and Temperature, RS232 Output
7.500
[190.50]
HOLD
POWER
RECORD
RECALL
5.488
[139.39]
°C/°F
ANEMOMETER
VANE
PROBE
Air Velocity
2.813
[71.45]
UNIT
M/SEC
KM/HR
FT/MIN
KNOT
MPH
THERMO-ANEMOMETER
®
3.120
[79.25]
Measure airflow and temperature simultaneously with Model
VT140 Vane Thermo-Anemometer. Remote probe is designed with
twisted vane arms and low friction ball bearings for accurate airflow
readings in low or high velocities. Microprocessor-based unit provides
fast, reliable air velocity measurement in five different scales. Model
VT140 features RS232 output, selectable °F or °C, Record/Recall minimum, maximum, and average readings, display hold, and automatic
shut-off to preserve battery. The large 1.4" (3.5 cm), dual function LCD
with contrast adjustment allows easy viewing at any angle. Unit
includes rugged holster with stand, one 9V battery, and instruction
manual.
SPECIFICATIONS
Air Velocity Ranges: 80 to 4925
ft/m, 1.4 to 90.0 kph, 0.9 to 55.9
mph, 0.4 to 25.0 m/s, 1.9 to 38.8
knots.
Temperature Range: 32 to 140°F
(0 to 60°C).
Accuracy: Air Velocity: ±2% + 1
digit, Temperature: 1.5°F (0.8°C).
Resolution: 10 ft/m, 0.1 kph, 0.1
mph, 0.1 m/s, 0.1 knots, 0.1°F,
0.1°C.
APPLICATIONS
Airflow measurements in heating, ventilation, and air conditioning systems, air duct analysis, wind tunnel studies,
or monitoring of process air.
VT140 Vane Thermo-Anemometer
VT140-N Vane Thermo-Anemometer with NIST
Model
VT-200
Temp. Sensor: Thermistor.
Temperature Limits: 32 to 122°F
(0 to 50°C) max 80% RH.
Power Supply: One 9V battery.
Output: RS232 serial interface via
3.5 mm terminal.
Housing: ABS plastic.
Weight: 0.84 lb (381 g).
Agency Approval: CE.
Vane Thermo-Anemometer
Measures Air Volume, Air Velocity, and Temperature, Built-in Datalogging
2.375
[121]
6.400
[162.56]
5.00
[127]
3.206
[81.4]
Model VT-200 Vane Thermo-Anemometer is ideal for balancing air conditioning and heating ducts or checking the operation of
fans and blowers. Model VT-200 measures air volume in cubic feet
per minute and cubic meters per minute. Air velocity measurements
can be viewed in ft/min, m/s, knots, km/hr, and mph with ±3% accuracy. The multifunction LCD can simultaneously display air velocity and temperature in selectable units or air flow and air area. Builtin datalogger can store up to 1000 measurements or transfer the
data to a PC via RS-232 communication. Additional features include
data hold and record/recall minimum, maximum and average readings. Model VT-200 includes RS-232 interface, PC Windows™ software, cable, 9V battery, carrying case, and instruction manual.
SPECIFICATIONS
Air Velocity Ranges: 0.3 to 45
m/s; 0.7 to 100 mph; 0.6 to 88.0
knots; 1 to 140.0 km/hr; 60 to
8,800 ft/min.
Temperature Range: 32 to 122°F
(0 to 50°C).
Air Volume Ranges: CFM (ft3/min)
or CMM (m3/min).
Accuracy: Air Velocity: ±3% of
reading ± 0.1, whichever is greater;
Temperature: ±1.5 °F (±0.8°C).
Resolution: 0.1 knots, m/s, km/hr,
and mph; 0.1/1 ft/min; 0.1°C.
Temperature Sensor: Type K
thermocouple.
Model VT-200 Vane Thermo-Anemometer
210
VISIT OUR WEBSITES:
www.dwyer-inst.com
•
www.dwyer-inst.co.uk
•
Temperature Limits: 32 to 140°F
(0 to 60°C).
Display: Dual line, 4-digit, 1.1˝
(27.9 mm) height.
Power: 9V alkaline battery (included). Battery Life: Approx. 50 hours.
Output: RS232 serial interface via
DB9 female connector.
Housing: ABS plastic, 1˝ (25 mm)
diameter.
Weight: 12.3 oz (350 g).
Agency Approval: CE.
www.dwyer-inst.com.au
Series
MVT
Mini-Vane Thermo-Anemometer
Display Air Flow, Air Velocity and Temperature, Telescoping Mini-Vane, RS232 Output
THERMO-ANEMOMETER
Air Velocity
7
[177.80]
MVT
3-5/16
[83.82]
Sense air velocity, air flow and temperature with the Series MVT
Mini-Vane Thermo-Anemometer. The meter uses a 1/2˝ (12.7 mm) diameter metal telescoping antenna sensor to detect air flows up to 2358 ft/min
and temperatures to 176°F (80°C). High accuracy is ensured with the low
friction ball bearing mini-vane. Air flow can be measured in CMM (m3/min)
or CFM (ft3/min) and temperature is selectable °F or °C. The MVT features a 4-digit LCD display, data hold, record/recall maximum and minimum, RS232 output, averaging up to 20 measurements, 2/3 the measured
value and auto shut-off to prolong life. The unit includes telescoping minivane probe, hard case, 9V battery and protective rubber holster with stand.
MVT176 Mini-Vane Thermo-Anemometer
MVT176-N Mini-Vane Anemometer with NIST
Accessories
MVT07 Mini-Vane Anemometer Soft Case
Model
PATH
SPECIFICATIONS
Air Velocity Ranges: 160 to 2358
ft/min; 1.8 to 26.8 mph; 1.6 to
23.3 knots; 0.8 to 12.00 m/s; 2.8
to 43.2 km/h.
Temperature Ranges: 32 to
176°F (0 to 80°C).
Accuracy: Air Velocity: ±2%;
Temperature: 1.5°F (0.8°C).
Resolution: 1 ft/min; 0.1 mph; 0.1
knots; 0.01 m/s; 0.1 km/h; 0.001
to 100 CMM/CFM; 0.1 °F/°C.
Temperature Sensor: Thermistor.
Ambient Operating
Temperature: Meter: 32 to 122°F
(0 to 50°C); Sensor: 32 to 176°F
(0 to 80°C).
Ambient Operating Humidity:
Maximum 80% RH.
Display: Dual function 0.5˝ (13mm)
4-digit LCD.
Sampling Rate: 1 second approx.
Output: RS232 PC serial interface
with 16-bit data stream output.
Power Requirements: 9V battery
(included).
Auto Shut-off: 15 minutes to preserve battery life.
Housing: ABS Housing.
Telescoping Sensor Length:
23.6˝ (600mm) max. with 39˝ (1m)
cable.
Weight: 1.6 lb (700 g) including
battery and probe.
Agency Approval: CE.
PATH SUPER KIT
Complete Pressure, Air Velocity, Temperature & Humidity Measurement Kit
PATH Super Kit incorporates three of Dwyer’s latest hand-held meters for pressure, air velocity, and temperature/humidity applications.
The Series 477 Digital Manometer measures from 0-20 in. w.c. with
±0.5% F.S. accuracy and has nine field selectable units. The kit also includes a 36˝ SS telescoping Pitot tube, two static pressure tips and 9
ft. of rubber tubing for quick pressure measurements. The Series 485
Digital Hygrometer enables you to simultaneously read humidity and
temperature on the 0.4˝ LCD. For air velocity, the Series 471 Digital
Thermo-Anemometer measures up to 15,000 fpm or 70 mps as well as
temperatures ranging from 0 to 200˚F or -17 to 100˚C. All instruments are fitted in an extra durable polyethylene case for transport
convenience and heavy duty protection.
PATH
PATH-N with NIST calibration certificates
(available only on 477-1 and 471-2)
Complete Kit Includes:
• Model 477-1FM Digital Manometer, range 0-20 in. w.c. (0.5 kPa)
• Model 471-2 Digital Thermo-Anemometer, 33˝ Adjustable Telescoping Tip
• Model 485-1 Digital Hygrometer, Simultaneously Displays % Relative Humidity and Temperature
• Model 166T, 36˝ Telescoping Stainless Steel Pitot Tube
• Two No. A-303 Static Pressure Tips with Magnetic Mounting
• Two 41⁄2 Ft. Lengths 3⁄16˝ I.D. Rubber Tubing
• No. A-397 Step Drill for 3⁄16˝ - 1⁄ 2˝ Holes in 1⁄16˝ Increments
• No. A-532 AV Slide Chart
• Three 9V Battery
• Fitted Polyethylene Case, dimensions 17˝ x 142˝ x 42˝ (431.8 x 368.3 x
114.3 mm).
CALL TO ORDER:
U.S. Phone 219 879-8000
•
U.K. Phone (+44) (0)1494-461707
•
Asia Pacific Phone 61 2 4272-2055
211
Model
475-1-FM-AV
Air Velocity Kit
Air Velocity
Includes Digital Manometer, Pitot Tube, Accessories
Complete Kit Includes:
Convenient all-in-one kit is small, light and easy to use. No set-up
or leveling needed. Digital manometer reads from 0-19.99 in. w.c. with
±0.5% F.S. accuracy and minor divisions to 0.01. Large 1⁄2" LCD readout
is easy to see in poorly lighted areas and has “low battery” warning. Included is a 6" stainless steel Pitot tube with integral compression fitting to hold it securely when taking readings. Also, two static pressure
tips with magnetic mounting measure pressure drop across filters,
condenser coils, etc. Kit comes complete with rubber tubing, 9V battery, step drill, AV calculator slide rule, and custom fitted carrying
case. An indispensable test kit for the plant engineer, industrial hygienist and HVAC technician.
• Model 475-1 Digital Manometer,
range 0-19.99 in. w.c.
• Model 166-6-CF, 6" Pitot Tube
with Compression Fitting
• Two No. A-303 Static Pressure
Tips with Magnetic Mounting
• Two 9 Ft. Lengths 3⁄16" I.D.
Rubber Tubing
• No. A-397 Step Drill for 3⁄16"1
⁄2" Holes in 1⁄16" Increments
• No. A-532 AV Slide Chart
• 9 Volt Battery
• Fitted Polyethylene Case
475-1-FM-AV Air Velocity Kit
Model
475-1T-FM-AV
Air Velocity Kit
Includes Digital Manometer, Telescoping 36 Inch Pitot Tube, Accessories
Convenient all-in-one kit is small, light and easy to use. No set-up
or leveling needed. Digital manometer reads from 0-19.99 in. w.c. with
±0.5% F.S. accuracy and minor divisions to 0.01. Large 1⁄2" LCD readout
is easy to see in poorly lighted areas and has “low battery” warning. Kit
includes convenient telescoping Pitot tube, Model 166T, fully adjustable
from 11.5 to 36 inches (29.2 to 91.4 cm). Also, two static pressure tips
with magnetic mounting measure pressure drop across filters, condenser coils, etc. Kit comes complete with rubber tubing, 9V battery,
step drill, AV calculator slide rule, and custom fitted carrying case. An
indispensable test kit for the plant engineer, industrial hygienist and
HVAC technician.
Complete Kit Includes:
• Model 475-1 Digital Manometer,
range 0-19.99 in. w.c.
• Model 166T, 36" Telescoping
Stainless Steel Pitot Tube
• Two No. A-303 Static Pressure
Tips with Magnetic Mounting
• Two 41⁄2 Ft. Lengths 3⁄16" I.D.
Rubber Tubing
• No. A-397 Step Drill for 3⁄16"1
⁄2" Holes in 1⁄16" Increments
• No. A-532 AV Slide Chart
• 9 Volt Battery
• Fitted Polyethylene Case
475-1T-FM-AV Air Velocity Kit
Model
477-1T-FM-AV
Air Velocity Kit
Includes Digital Manometer, Telescoping 36 Inch Pitot Tube, Accessories
Convenient all-in-one kit is small, light and easy to use. No set-up
or leveling needed. Digital manometer reads from 0-20 in. w.c. with
±0.5% F.S. accuracy. The Series 477 stores up to 20 readings in memory for later reference, instantly selecting up to nine English/Metric
pressure units that are visible on a large, backlit 0.4" LCD readout.
Both audible and visual overpressure alarms and a “low battery” warning are standard features.
Each kit includes convenient telescoping Pitot tube, Model 166T which
is fully adjustable from 11.5 to 36 inches (29.2 to 91.4 cm). In addition,
two static pressure tips with magnetic mountings measure pressure
drop across filters, condenser coils, etc.
Kit comes complete with rubber tubing, 9V battery, step drill, AV calculator slide rule, and custom fitted carrying case. An indispensable
test kit for the plant engineer, industrial hygienist and HVAC technician.
Complete Kit Includes:
• Model 477-1 Digital
Manometer, range 0-20
in. w.c.
• Model 166T, 36" Telescoping
Stainless Steel Pitot Tube
• Two No. A-303 Static
Pressure Tips with
Magnetic Mounting
• Two 41⁄2 Ft. Lengths 3⁄16" I.D.
Rubber Tubing
• No. A-397 Step Drill for 3⁄16"
- 1⁄2" Holes in 1⁄16" Increments
• No. A-532 AV Slide Chart
• 9 Volt Battery
• Fitted Polyethylene Case
477-1T-FM-AV Air Velocity Kit
212
VISIT OUR WEBSITES:
www.dwyer-inst.com
•
www.dwyer-inst.co.uk
•
www.dwyer-inst.com.au
Series
641
Air Velocity Transmitter
16 Field Selectable Ranges in FPM or MPS
1/2-14 NPT
DWYER INSTRUMENTS, INC.
102 INDIANA HWY 212
MICHIGAN CITY, IN 46360
4-29/64
[113.11]
1/2 NPT
PHONE: 219-879-8000
e-mail: [email protected]
http://www.dwyer-inst.com
B DIMENSION
A DIMENSION
2-23/32
[29.06]
1/2-14 NPT
DWYER INSTRUMENTS, INC.
102 INDIANA HWY 212
MICHIGAN CITY, IN 46360
4-29/64
[113.11]
1/2 NPT
The new Dwyer Series 641 Air Velocity Transmitter is the ideal
instrument for monitoring air flow. This transmitter uses a heated
mass flow sensor which allows for precise velocity measurements at
various flow rates and temperatures. The 641’s 16 field selectable
ranges provides it the versatility to be selected for several air flow
applications. The optional LED produces a complete, low-cost solution
for local indication of air flow.
Features
• Ranges to 15,000 FPM or 75 MPS
• Optional Bright LED Display
• Easy Push Button Set-up
• Compact Housing
• 4-20 mA Output
• Digital Filter for Signal Damping
Applications
• Exhaust Stack Flow Monitoring
• Air Control in Drying Processes
• HVAC Air Velocity Measurements
• Fan Supply and Exhaust Tracking
MODELS
Model Number
641-6
641-6-LED
641-12
641-12-LED
641-18
641-18-LED
641-24
641-24-LED
641-30
641-30-LED
641-36
641-36-LED
Probe Length*
6˝ (152.4 mm)
6˝ (152.4 mm)
12˝ (304.8 mm)
12˝ (304.8 mm)
18˝ (457.2 mm)
18˝ (457.2 mm)
24˝ (609.6 mm)
24˝ (609.6 mm)
30˝ (762 mm)
30˝ (762 mm)
36˝ (914 mm)
36˝ (914 mm)
U.S. Phone 219 879-8000
SPECIFICATIONS
Service: Clean air and compatible, non-combustible gases.
Accuracy:
3% FS Process gas: 32 to 122°F (0 to 50°C).
4% FS Process gas: -40 to 32°F & 122 to 212°F
(-40 to 0°C & 50 to 100°C).
Response Time: Flow: 1.5 seconds to 95% of final value (Output
filter set to minimum).
Temperature Limits: Process: -40 to 212°F (-40 to 100°C).
Ambient: 32 to 140°F (0 to 60°C).
Pressure Limit: 100 psi (6.89 bar) maximum.
Humidity Limit: Non-Condensing.
Power Requirements: 12–35 VDC, 10–16 VAC.
Output Signal: 4-20 mA, isolated 24V source, 3 or 4-wire connection.
Output Filter: Selectable 0.5 –15 (seconds).
Loop Resistance: 600 ohms max.
Current Consumption: 300 mA max.
Electrical Connections: Screw terminal.
Process Connections: 1/2˝ male NPT.
Enclosure Rating: Designed to meet NEMA 4X (IP66) for non
LED models only.
Mounting Orientation: Unit not position sensitive. Probe must
be aligned with airflow.
Weight: 12.6 oz (357.2 g).
Agency Approval: CE.
OPTIONAL DISPLAY VERSION:
Display: 4-1/2 digit 1/2˝ red LED.
Resolution: 1 FPM, 0.01 MPS
(10 FPM @ 10,000 and 15,000 FPM ranges).
Weight: 13.3 oz (377 g).
ACCESSORIES
A-156 Universal Mounting Plate 1/2˝ female NPT
No. A-158 Split Flange Mounting Kit
No. A-159 Duct Mounting Gland
*Other probe lengths available contact factory.
CALL TO ORDER:
641 AVT WITH DISPLAY OPTION
A DIMENSION B DIMENSION
7-63/64
9-13/16
[202.80]
[249.24]
13/16
13-63/64
15-13/16
[355.20]
[20.64]
[401.64]
19-63/64
21-13/16
[507.60]
[554.04]
26-63/64
28-13/16
[685.40]
[731.84]
32-63/64
34-13/16
[837.80]
[884.24]
37-63/64
39-13/16
[964.80]
[1011.24]
641 AVT WITHOUT
DISPLAY OPTION
A DIMENSION B DIMENSION
7-7/16
9-9/32
25/32
[188.91]
[235.74]
13-7/16
15-9/32
[19.84]
[341.31]
[388.14]
19-7/16
21-9/32
[493.71]
[540.54]
26-7/16
26-9/32
[671.51]
[718.34]
29-7/16
34-9/32
[747.71]
[870.74]
37-7/16
39-9/32
[950.91]
[997.74]
•
U.K. Phone (+44) (0)1494-461707
•
Asia Pacific Phone 61 2 4272-2055
213
Air Velocity
PHONE: 219-879-8000
e-mail: [email protected]
http://www.dwyer-inst.com
B DIMENSION
A DIMENSION
3-1/4
[82.55]
Series
641RM
Air
Velocity
Transmitter
with
Cable
For Remotely Mounting Electronic Enclosure
1-5/8 [41.28] WITH LED
1-3/32 [27.78] WITHOUT LED
Air Velocity
1/2 NPT
43/64
[17.07]
4-31/32
[126.21]
6 FT
[152.40]
Ø5/16
[Ø7.94]
Ø13/64
[Ø5.16]
14-21/64
[53.07]
FOR A STANDARD 12˝ PROBE
1-39/64
[40.88]
1-25/32
[45.24]
SPECIFICATIONS
The Series 641RM is the ideal instrument for monitoring air
flow. This transmitter uses a heated mass flow sensor, which
allows for precise velocity measurements at various flow rates
and temperatures. The 641’s 16 field selectable ranges from 0250 to 15,000 FPM (0-1.25 to 75 MPS) provide it the versatility
to be selected for a multitude of applications. The unit’s 6’
cable which connects the sensing probe with the electronic
enclosure allows the enclosure to be mounted where it can be
more easily accessed. Longer cable lengths are available for
ducts that are at very high elevations from the plant floor. The
optional LED produces a complete, compact solution for local
indication of air flow.
Service: Air and compatible, non-combustible gases.
Accuracy:
3% FS Process gas: 32 to 122°F (0 to 50°C).
4% FS Process gas: -40 to 32°F & 122 to 212°F
(-40 to 0°C & 50 to 100°C).
Response Time: Flow: 1.5 seconds to 95% of final value
(output filter set to minimum).
Temperature Limits: Process: -40 to 212°F (-40 to
100°C). Ambient: 32 to 140°F (0 to 60°C).
Pressure Limit: 100 psi (6.89 bar) maximum.
Humidity Limit: Non-Condensing.
Power Requirements: 12–35 VDC, 10–16 VAC.
Output Signal: 4-20 mA, isolated 24V source, 3 or
4-wire connection.
Output Filter: Selectable 0.5–15 (seconds).
Loop Resistance: 600 ohms max.
Current Consumption: 300 mA max.
Electrical Connections: Screw terminal.
Mounting Orientation: Unit not position sensitive.
Probe must be aligned with airflow.
Weight: 13.2 oz (374.26 g).
Cable Length: 6 ft (1.82 m).
Probe Length: 12˝ (30.48 cm) standard.
Probe Diameter: 5/16˝ (0.79 cm).
Model 641RM-12, Air Velocity Transmitter with 6’ cable
Model 641RM-12-LED, same as above with LED display
ACCESSORIES
A-156 Universal Mounting Plate, 1/2˝ female NPT
No. A-159 Duct Mounting Gland
No. A-158 Split Flange Mounting Kit
214
VISIT OUR WEBSITES:
www.dwyer-inst.com
31/64
[12.30]
OPTIONAL DISPLAY VERSION:
Display: 4-1/2 digit 1/2˝ red LED.
Resolution: 1 FPM, 0.01 MPS
(10 FPM @ 10,000 and 15,000 FPM ranges).
Weight: 13.9 oz (394.16 g).
•
www.dwyer-inst.co.uk
•
www.dwyer-inst.com.au
Series
641B
Air Velocity Transmitter
8 Field Selectable Ranges in FPM or MPS
Air Velocity
9-1/4
[235.0]
4-31/32
[126.21]
1/2 NPT
1-23/32
[43.66]
The Series 641B Air Velocity Transmitter uses a heated
mass flow sensor technology. It has 4 user-selectable ranges
from 250 FPM to 2000 FPM with corresponding metric ranges
of 1.25 MPS to 10 MPS. The 641B provides an isolated 4-20 mA
output proportional to the velocity.
The Series 641B’s steel sensor allows the unit to be used in
dirty air environments. This rugged sensor is ideally suited for
quick field cleaning from a simple cloth to a pulse of air from an
air source. Proper sensor performance can be maintained in
these polluted environments by easily removing dust and debris
from the sensor which is problematic for pitot tubes and other
flow sensing transmitters.
641B-4 Air Velocity Transmitter
Accessories
A-156, Flange Mounting Plate with 1/2˝ female NPT
A-155, Mounting Gland with 1/2˝ male NPT fitting
SPECIFICATIONS
Service: Air and compatible, non-combustible gases.
Accuracy:
5% FS Process gas: 32 to 122°F (0 to 50°C).
6% FS Process gas: -40 to 32°F & 122 to 176°F
(-40 to 0°C & 50 to 80°C).
Response Time: Flow: 1.5 seconds to 95% of final value
(Output filter set to minimum).
Temperature Limits: Process: -40 to 176°F (-40 to 80°C).
Ambient: 32 to 140°F (0 to 60°C).
Humidity Limit: Non-condensing.
Power Requirements: 12–35 VDC, 10–16 VAC.
Output Signal: 4-20 mA, isolated 24V source, 3 or
4-wire connection.
Output Filter: Selectable 0.5 –15 (seconds).
Loop Resistance: 600 ohms max.
Current Consumption: 300 mA max*.
Electrical Connections: Screw terminal.
Enclosure Rating: Designed to meet NEMA 4X.
Mounting Orientation: Unit not position sensitive.
Weight: 12.6 oz (357.2 g).
* A brief current transient exceeding 300 mA may be seen
on startup.
CALL TO ORDER:
U.S. Phone 219 879-8000
•
U.K. Phone (+44) (0)1494-461707
•
Asia Pacific Phone 61 2 4272-2055
215
Series
PF
™
Precision Flow Air Velocity Transmitter
Air Velocity
High Accuracy, 0.2 Second Response, 4 to 20 mA Output
SPECIFICATIONS
Precision Flow™ Air Velocity Transmitters directly monitor gas mass flow
rates of free air flows or single point flows in pipes, ducts and stacks. The 4 to 20
mA output signal is linearly proportional to gas mass velocity without additional
compensation needed for pressure and temperature variations. The 304 SS insertion probe contains a velocity sensor to monitor mass flow and a temperature sensor to automatically correct for temperature changes. The probe is directly
mounted to a NEMA 2 anodized aluminum enclosure. Stocked models are calibrated for air.
Service: Air, nitrogen, or non-corrosive,
non-combustible gases.
Wetted Materials: 304 SS probe, glass
coated sensor, epoxy.
Accuracy: ±1% FS, ±0.5% of reading
over 32 to 122°F (0 to 50°C) and 5 to 30
psia (0.35 to 2 kg/cm2).
Repeatability: 0.2% F.S.
Temperature Limits: -40 to 250°F
(-40 to 121°C).
Pressure Limits: 150 psig
(10 kg/cm2 G) max.
Power Requirements: 15 to 18 VDC,
300 mA max.
Output: 4 to 20 mA, linear.
Response Time: 0.2 seconds to 63%
of final velocity value.
Loop Resistance: 400 1 max.
MODELS
Model Number
Range
PF1300202
PF1300204
PF1300206
0 to 2000 SFPM
0 to 4000 SFPM
0 to 6000 SFPM
APPLICATIONS
Heating, ventilation and air conditioning (HVAC); hood and gas cabinet
monitoring; cleanroom and cleanbench face velocity monitoring.
Series
PFS
Electrical Connection: Four wire
standard connector.
Probe Dimensions: 1⁄4˝ (6.35 mm) O.D.,
13˝ (33 cm) length.
Operating Temperature: 32 to 122°F
( 0 to 50°C).
Weight: 0.7 lb (0.30 kg).
Suggested Specifications
Air velocity transmitter shall be an insertion
type mass flow meter with accuracy of ±1%
FS, +0.5% of reading and a 0.2 second response time. Transmitter shall provide a 420 mA output signal linearly proportional to
gas mass velocity. Insertion probe shall be
constructed of 304 SS with a glass coated
sensor assembly. Electronics shall be housed
in a NEMA 2 enclosure. Air velocity transmitter shall be Dwyer Model No. PF____.
Smart Air Velocity Transmitter
Field Rangeable, 0.1 Second Response, ±0.2% Repeatability
1
[25.40]
2-3/8
[60.33]
3/4
[19.05]
4
[101.60]
2-1/2
[63.50]
4
[101.60]
1/2 NPT
13
[330.20]
9/32
[7.14]
9/16
[14.30]
3/8
[9.53]
Series PFS Smart Air Velocity Transmitter measures mass flow
rate of air, nitrogen, or other non-combustible gases and delivers a linear 4 to 20 mA output signal. The smart electronics permit field configuration of flow range and full validation of calibration. Compensate
for flow profile variations or specific application conditions with the KFactor correction feature. Series PFS include user-adjustable high and
low alarm outputs and adjustable time response to track flow fluctuations. View flow rate on units with built-in display. All parameters can
be quickly programmed via three push buttons or RS-232 and the
Windows™ 95 based software (sold separately).
SPECIFICATIONS
Service: Air, nitrogen, or non-corrosive,
non-combustible gases.
Wetted Materials: 304 SS probe, glass
filled polyester sensor, epoxy, and ceramic.
Accuracy: ±1% FS.
Repeatability: ±0.2% full scale.
Temperature Limits: -40 to 250°F
(-40 to 120°C).
Pressure Limits: 150 psig (10 bar) max.
Power Requirements: 18 to 30 VDC,
625 mA max.
Output: 4 to 20 mA linear, optical/galvanic isolated; proportional to point mass flow
rate or velocity.
Zero and Span Adjustment: 50 to
100% FS.
MODELS
Model Number
Range
Display
PFS1300204
PFS1300210
PFS1300215
PFS13002041
PFS13002101
PFS13002151
0 to 4000 SFPM
0 to 10,000 SFPM
0 to 15,000 SFPM
0 to 4000 SFPM
0 to 10,000 SFPM
0 to 15,000 SFPM
No
No
No
Yes
Yes
Yes
Response Time: 0.1 seconds to 63% of
final velocity value.
Loop Resistance: 7001 max.
Relay Rating: Maximum
42 VAC/VDC, 140 mA.
Electrical Connection: 1/2˝ female
NPT.
Enclosure Rating: NEMA 4X (IP65)
powder-coated cast aluminum.
Mounting: 3/8˝ tube compression fitting
(not included).
Correction Factor Setting: 0.5 to 2.
Computer Requirements: IBM compatible 386 or above and Windows™ 95 or
later with minimum 8 mB RAM (16 mB
preferred) and one serial port.
Weight: 0.7 lb (0.30 kg).
Agency Approvals: CE.
Accessories
No. PFS60 Windows™ Software and Connecting Cable . . . . . . .
216
VISIT OUR WEBSITES:
www.dwyer-inst.com
•
www.dwyer-inst.co.uk
•
www.dwyer-inst.com.au
Model
AFH
Electronic Balometer
Measures Volumetric Flow Rate and Temperature
SPECIFICATIONS
Service: Air.
Volume Flow Rate: 30 to 1180 cfm (50 to 2000 m3/h).
Air Velocity
Temperature Limits: 32 to 176˚F (0 to 80˚C).
Accuracy: ±2% of reading.
Temperature Accuracy: ±0.5% of reading.
Display: 4 digit LCD, 0.45˝ High.
Output: RS 232 serial interface.
Memory Capability: 99 readings.
Volume Flow Resolution: (1 m3/h, l/s, or cfm).
Temperature Resolution: (0.1°C or 1°F).
Velocity Resolution:1 fpm (0.01 m/s)
Power Requirements: 4 AA batteries (included).
Pressure Drop Across: 0.22˝ H2O Max (55 Pa).
Weight: 26.55 lb (12.04 kg).
Agency Approvals: CE.
Rapidly obtain accurate measurements of airflow distribution
in HVAC systems. The versatile design of the AFH electronic balome-
Model AFH
ter allows easy data acquisition on ceiling, wall-mounted, and floorlevel diffusers, working in supply or exhaust. View measurements
easily on the large LCD display, and store up to 100 readings in its non-
Accessories
volatile memory for later analysis. Download data to your computer
A-542: 1’x4’ hood expansion kit
A-543: 1’x5’ hood expansion kit
A-544: 2’x4’ hood expansion kit
A-545: 3’x3’ hood expansion kit
A-546: Vane anemometer (used in conjunction with
base unit to calculate air velocity)
A-547: RS-232 computer cable
via the A-547 RS-232 cable (sold separately). Eliminating time-consuming calculations, this instrument utilizes a sixteen-point measurement array to display flow in cfm, m3/h, or 1/s. Light weight and easy
to handle, the AFH requires only one person to operate. Standard
2’x2’; hood fits over most standard grills and exhausts. Additional
hood expansion kits are sold separately. Each unit includes: AFH
meter, 2’ x 2’ hood, rugged carrying case, four universal hood-support
poles, four AA batteries and calibration data sheet.
CALL TO ORDER:
U.S. Phone 219 879-8000
•
U.K. Phone (+44) (0)1494-461707
•
Asia Pacific Phone 61 2 4272-2055
217
No.
480
Vaneometer
Swing Vane Anemometer, Use This Sensitive New
™
Air Velocity
Dwyer Unit to Measure Low Air Velocities – at Low Cost *
The Dwyer 480 Vaneometer™ Swing Vane Anemometer is a durable low-priced instrument specifically
designed to simplify the measurement of low air velocities from 25 to 400 feet per minute. OSHA, EPA and other
safety ventilation requirements for spray booths and at fume, smoke and dust exhaust hoods can now be quickly
checked, even by untrained personnel. Its small size and light weight — only four ounces make it ideal to carry
from one work station to another. A versatile steel mounting bracket for continuous monitoring is also included.
The Vaneometer™ Swing Anemometer is accurate to ±5% of full scale to 100 FPM and ±10% from 100 FPM to
top of scale. It has a spirit level to ensure accurate readings and the large scales are easy to read and visible from
both sides. The housing is molded from tough ABS plastic and easy to clean with soap and water. The polyester
vane can be cleaned with lacquer thinner. A spare vane is provided.
Use a VaneometerTM to measure
velocity of air flow into laboratory fume hoods and at paint
spray booths to determine
when to change filters. Or
wherever needed to meet
OSHA standards of ventilation
for smoke, dust or fume removal.
MODELS
Model
480
M480
A-390
A-406
A-407
Description
VaneometerTM, 25-400 fpm
VaneometerTM, 0-2.0 m/s
Extra vanes, pkg. of 2
Molded carrying case
Plastic carrying pouch
*U.S. Patent No. 4,154,101
No.
460
Air
Meter
A Low-Cost, Direct Reading Instrument Used
for Both Air Velocity & Static Pressure Tests
Simple and quick, the No. 460 Air Meter is
popular for servicing air conditioning, heating and ventilating equipment. Direct reading velocity and static pressure scales — both
low and high ranges — show supply and return grille velocities, furnace draft, pressure
drop across filters, etc. The 460 gives consistent, accurate results with no tedious calibration. Rugged plastic for rough daily use. Dual
velocity ranges read 260-1200 and 1000-4000
fpm; pressure ranges from .005-.09 and .05 1.0 inches w.c.
A COMPLETE POCKET-SIZE KIT
Includes air meter, return and supply grille probes, angle connector, cleaning materials, instruction card, air velocity calculator, carrying case and one extra plastic ball in plastic tube (not shown).
460 Air Meter, complete kit
A-378 Tube of 3 replacement floats
A-379 Supply grill probe
A-380 Return grill probe
A-381 Cleaning kit including 3 anti-static chemically treated pipe stem cleaners and nylon high
range orifice cleaner
Furnace
draft (left)
Grille
velocities
(right)
218
VISIT OUR WEBSITES:
www.dwyer-inst.com
•
www.dwyer-inst.co.uk
•
www.dwyer-inst.com.au
Model
660
Air
Velocity
Monitor
Continuously Measures Fume Hood Airflow
CENTER OF HOLE 4˝ (101)
BELOW BOTTOM OF
FULL OPEN SASH
SASH
01-3/32
[27.76]
OUTLET
HOLE
4-1/2
[114.30]
1-13/64
[30.56]
5/8
[15.88]
7/32
[5.56]
AIR VELOCITY
MONITOR
Air Velocity
2-53/64
[71.83]
TUBING
4-10˝
(101 - 254)
SIDE WALL
SASH TRACK
2-3/4
[69.85]
3-13/64
[81.36]
Model 660 Air Velocity Monitors are a practical, affordable way to continuously monitor for safe airflows through laboratory fume hoods. They
are typically installed in the fume hood side fascia and connected to the
interior sidewall via 11⁄8" flexible tubing. As the exhaust fan draws air
through the device, a sensitive constant temperature thermistor measures
flow and lights a green (normal), yellow (high) or red (low) LED. An audible alarm also warns of low flow and requires manual resetting. Mounting
holes fit standard single gang electrical box.
Model 660 Air Velocity Monitor. Includes
3’ flexible tubing, pre-fittings and 90° elbow,
120 VAC to 24 VAC power transformer.
SPECIFICATIONS
Service: Air and non-combustible, non-corrosive gases.
High Setpoint Range: 0-275 FPM (0-1.397 m/s).
Low Setpoint Range: 0-150 FPM (0-.792 m/s).
Repeatability: ±7% of full span, 0-50 and 150-275 FPM; ±5% of full
span, 50-150 FPM.
Compensated Temperature Range: 50 to 90°F (10 to 32.2°C).
Operating Temperature Range: 32 to 120°F (0 to 48.9°C).
Power Supply: 24 VAC, 3 watts maximum.
Response Time: 6-10 seconds.
Warm-Up Time: 3-5 minutes (no flow).
Audible Alarm: 75 dB between 3-10 feet.
Weight: 3 oz (85 g).
Mounting Hardware: (2) #6 x 1" sheet metal screws, (2) 6-32 x 7⁄8"
machine screws.
(Note: Standard discounts do not apply to the Wind Speed Indicator or Windmeter. Sporting goods dealers and distributors: Contact factory for quantity discounts.)
Mark II Wind Speed Indicator
Portable Wind Meter
Ideal for yachtsmen,
outdoorsmen, farmers,
etc. A welcome gift.
Use anywhere. Direct
reading, no calculations. Hold meter at eye
level, back of unit to
wind. White ball in tube
indicates wind speed.
Meter has two scales
for maximum accuracy
and easy reading — low,
2-10 and high, 4-66
m.p.h. range. For high
range, cover hole with
finger. Pocket size, sturdy plastic, has case.
Molded white plastic
instrument has gold
tone scale, 73⁄8"W X
55⁄8"H X 11⁄8"D. Includes
ABS plastic vane, 50’
tubing,
mounting
hardware and gage
oil.
Perfect for your living room, den, workshop or office. Instruments are accurate, low-cost and practical. Standard model indicates wind speed directly on liquid filled scale reading in both
Miles per Hour (0-80) and Beaufort scale (1-12). Also available is
metric model, same as above but reading 0-130 kilometers per
hour. To order, specify Mk II Wind Speed Indicator, MPH or Mk
II Wind Speed Indicator, KPH.
Mark II WSI, mph scale
Mark II WSI Metric, kph scale
CALL TO ORDER:
U.S. Phone 219 879-8000
•
Hold this
way for
low scale
reading.
For high
scale
reading,
finger
covers
hole.
Dimensions: 5/8˝ W X 6-3/4˝ H X 17/32˝ D.
Wind Meter-MPH, mph scale
Wind Meter-KNOT, knots scale
Wind Meter-KPH, kph scale
Wind Meter-MPS, mps scale
A-376 Replacement floats for windmeter, tube of 3
A-377 Tube cleaning kit for windmeter
U.K. Phone (+44) (0)1494-461707
•
Asia Pacific Phone 61 2 4272-2055
219
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