Omega Engineering WTM-1000 User manual

WTM-1000
Laboratory Grade, Bench Top
Mini Wind Tunnel
Anemometer
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User’s Guide
®

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves
the right to alter specifications without notice.
U.S.A.:
omega.com [email protected]
Omega Engineering, Inc:
800 Connecticut Ave. Suite 5N01, Norwalk, CT 06854, USA
Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone]
e-mail: info@ome ga.com
Omega Engineering,
limited:
1 Omega Drive, Northbank,
lrlam Manchester M44 5B0
United Kingdom
Fax: [phone]
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GmbH:
Daimlerstrasse 26 75392
Deckenpfronn Germany
For Other Locations Visit
omega.com/worldwide

Page
Chapter 1 Introduction .......................................................................... 1
1.1 Description ............................................................................................ 1
1.2 Unpacking ............................................................................................. 1
Chapter 2 Operation ............................................................................. 5
2.1 Setting Up the Mini Wind Tunnel - Precautions ...................................... 5
2.2 Operating the Wind Tunnel .................................................................... 5
2.3 Correction Factors .................................................................................. 6
Chapter 3 Specifications ....................................................................... 8
Chapter 4 In Case Of Problems ............................................................. 9
Chapter 5 Maintenance ...................................................................... 10
Chapter 6 Spare Parts and Replacement Parts .................................... 10
i
Table of Contents
1.3Safety Information .................................................................................. 2

WTM-1000 Laboratory Grade, Bench Top Mini Wind Tunnel
A
ii
Notes

1
Introduction 1
Introduction
1.1 Description
The new Mini Wind Tunnel Model WTM-1000 is designed to give a highly
uniform flow rate over a 10 cm (4") diameter test chamber. The Wind Tunnel has
an electronic control unit where it controls the DC Fan speed and provides four
selectable fixed air speeds. The fixed air speeds are:
2.5 m/s (492 FPM)
5 m/s (984 FPM)
10 m/s (1969 FPM)
15 m/s (2953 FPM)
In addition, there is a REMOTE selection on the electronic control unit selector
switch. This will allow connecting an external potentiometer to control the DC
fan speed and be able to vary the speed from 0 to 15 m/s. A cable to connect an
external potentiometer to the control unit is included in the shipping box.
The purchase of the WTM-1000 also includes a NIST traceable calibration
certificate.
Figure 1- Illustrates the important components of the wind tunnel as well as it’s
overall dimensions (page 3). Figure 2 - Shows the front panel of the Electronic
Control Box (page 4). Figure 3 - Shows the rear panel of the Electronic Control
Box (page 4).
1.2 Unpacking
1.2.1
Remove the packing list and verify that you have received all your equipment. If
you have any questions about the shipment, please call our Customer Service
Department at 1-800-622-2378 or 203-359-1660. We can also be reached on the
Internet at omega.com, e-mail: [email protected]. When you receive the
shipment, inspect the container and equipment for any signs of damage. Note
any evidence of rough handling in transit. Immediately report any damage to
the shipping agent.
NOTE
The carrier will not honor any claims unless all shipping material is
saved for their examination. After examining and removing contents,
save packing material and carton in the event reshipment is necessary.
With your order of the WTM-1000 Mini Wind Tunnel you get:
1. Wind Tunnel
2. Power Cord
3. Remote Connection Cable
5. Spare Fuse
6. Vane/Probe Clamp Sleeve
7. Chamber Door
8. Vane Window Door
9. Package of ten 1/4" Teflon Compression Ferrules
10. NIST Traceable Calibration Certificates
11. Operators manual

Call Omega Engineering for pricing and availability.
Introduction
1
2
ACCESSORIES DESCRIPTION
POWER CORD-DM Power cord with connector for Denmark
POWER CORD-E-10A Power cord with connector for Continental Europe
POWER CORD-IT Power cord with connector for Italy or Ireland
POWER CORD-SE Power cord with stripped ends (no connector)
All countries 250 Vac max
POWER CORD-UK Power cord with connector for United Kingdom
POWER CORD Power cord with connector for North America
MOLDED (USA, Mexico, Canada) standard 120 Vac
1.3Symbols and Safety Information
Symbols Used
The following table lists the International Electrical Symbols. Some or all these symbols may be
used on the instrument or in this manual.
• “WARNING” Identifies conditions and actions that may pose hazards to the user.
• “CAUTION” Identifies conditions and actions that may damage the instrument being used.
WARNING
• No replacement cord shall be used other than the one shipped with the product.
• Use equipment only as instructed in the manual, otherwise protection may be impaired and
user is risking an injury.
• Disconnect power from the source before changing the fuse.
Alternating Current (AC)
Caution/Warning: Read User’s Manual (Important Instructions)
Caution. Possibility of electric shock
Off
On
The following definitions apply for “WARNING” and “CAUTION”.

Introduction 1
3
INTAKE HONEYCOMB HONEYCOMB
INTAKE GUARD
VANE/PROBE CLAMP SLEEVE
CHAMBER DOOR
ADJUSTABLE PROBE/VANE MOUNTING BLOCK TRANSITION RING
EXPANSION CONE
ELECTRONIC CONTROL BOX
SCRIBED CENTERING LINES ON 4 AXIS
CARRYING HANDLE DIMENSIONS CM (IN.)
EXHAUST END VIEWIN-TAKE END VIEW FRONT VIEW
FAN SPEED CONTROL
PROBE PORT #1 (FRONT) PROBE PORT #2 (BACK) 1/4" COMPRESSION FITTING BOTH PORTS
FAN MOUNTING LEG DC FAN FAN GUARD
EXHAUST
CARRYING
HANDLE
69.85
(27.5)
29.85
(11.75)
41.91
(16.5)
20.96
(8.25)
INTAKE LEG
AIR FLOW
10.16 (4.0) DIAMETER TEST CHAMBER
INTAKE
Figure 1 - Important Components of Mini Wind Tunnel and Overall Dimensions

Introduction
1
4
Figure 2. Front Panel, Control Unit Box
POWER LED
5 (984) 10 (1969)
15 (2953)
REMOTE
CALIBRATION
ADJUSTMENTS
AIR SPEED
SELECTOR SWITCH
AIR VELOCITY
m/s (FPM) 2.5 m/s 5 m/s 10 m/s 15 m/s
2.5 (492)
ZERO
POWER
MINI WIND TUNNEL
WTM-1000 SERIES
Figure 3. Back Panel, Control Unit Box
AC INPUT
90-250 VAC
@50/60 Hz
2 BUILT-IN
FUSES
0.5 A, 250 V
POWER
SWITCH
MODEL NO: WTM-1000
SERIAL NO:
MADE IN THE U.S.A.
REMOTE
CW- INCREASING AIR SPEED
CW
5W
FAN CONTROL
OMEGA ENGINEERING. INC.
STAMFORD. CT 06907-0047
1-800-826-6342 omega.com
CONNECT TO EXTERNAL
POTENTIOMETER WITH
CABLE PROVIDED
(REMOTE OPTION)
90-250 VAC 50/60 HZ, 50 W
FUSE: T0.5 A, 250 V
FUSE
T3.15A 250 V
CAUTION: FOR CONTINUED PROTECTION AGAINST
THE RISK OF FIRE REPLACE WITH ONLY THE SAME
TYPE, RATING AND SIZE OF FUSE. DISCONNECT
POWER FROM SOURCE BEFORE CHANGING FUSE.
CONNECT TO
DC FAN
EXTERNAL
POTENTIOMETER
10 TURN

5
Operation 2
Operation
2.1 Setting Up the Mini Wind Tunnel - Precautions
A wind tunnel’s performance can be severely diminished if not used properly.
Please follow the following tips:
• Do not use the wind tunnel in small rooms. The air flow creates currents that
undermine the wind tunnel’s accuracy.
• Avoid locating the intake and exhaust toward open windows, door ways or
corridors where people are walking. The effect of air current changes across
the intake has a severe affect on the flow rate changing in the wind tunnel.
• There should be at least 1.5 m (5 feet) clear space in front of and behind the
wind tunnel. No obstacles, moving objects, or open doors or windows.
• Locate the exhaust towards the largest open area of the room to minimize
room air currents. The higher the flow rate, the more chance of creating currents.
• Air Probe geometry affects the readings. There is a correction factor table for
different types of air probes (Hot wire & Vane type).
• The air flow rate of the wind tunnel depends on the air temperature and
barometric pressure. Adjust it accordingly.
• This instrument should only be used for its intended purpose in accordance to
the instruction manual.
2.2 Operating the Wind Tunnel
Before operating the wind tunnel, please follow all the precautions stated in the
previous section and then proceed as follows:
1- Connect the cable from the DC Fan to the back of the Control unit
box labeled 'Fan Control'. Make sure the power switch in the back of the control
unit is off.
2- Connect the AC input of the Control unit to a line voltage (90 to 250 VAC @
50/60 Hz) with the Power cord provided. Please refer to the accessory table for
power cords for other countries.
3- Set the air speed selector switch on the front of the control unit to Zero
position (Meaning Zero air velocity). Turn on the Power switch in the back. You
will see the power LED indicator on the front of the control box turns on.
The air speed selector switch can be set to four fixed air speeds. The wind tunnel
has been calibrated at these four air speeds. The standard conditions are at
70ºF (21.1ºC) ambient temperature and 29.92 inches of Hg of Barometric
pressure. There are four plugs in front of the control unit box. Removing the
plugs, you will have access to potentiometers that will allow you to adjust the air
speed at the four settings.
For Hot wire anemometers:
1- Use the Chamber Door (Solid) to cover the test chamber.
2- Insert the air probe into Port #1 as shown in Fig 1. Port #2 is used to insert a
reference air probe if desired.
3- Align the air probe sensor to the center of the chamber using the scribed line on
the outside of the chamber.
4- Use the Teflon Ferrules and “hand-tighten” the probe in place. Do not use tools or
wrenches.

Operation
2
6
Correction Factor - K2
For Vane Type Anemometers:
1- Remove the chamber door. Open the clamp in the adjustable mounting block by
turning the wheel.
2- Place the vane propeller inside the chamber. Make sure it is in the center
of the chamber.
3- Place the vane window door.
4- Secure the vane propeller in place by tightening the clamp using the wheel.
5- Slide the Vane Clamp sleeve over the vane window door and up against the vane
probe to minimize any air leaks.
Once the air probe is in place (either Hot wire or Vane type), turn the air speed
selector switch from 2.5 m/s (492 FPM) up to 15 m/s (2953 FPM). Check the air
probe reading vs. the switch setting on the wind tunnel.
2.3 Correction Factors
For Hot Wire Anemometers:
If the environmental conditions are other than the standard conditions (70 ºF and
29.92 inches of Hg), you need to correct for them. Here is the correction factor
equation:
K1 = (29.92 / P) x (460 + T) / 530 where,
P is the Barometric pressure in inches of Hg
T is the ambient temperature in Degree F
There is a second correction factor which is a function of the air probe geometry (K2).
Table 1 lists K2 for different air probes. So, the actual air velocity is as follows:
Actual Value = Measured Value (Average value over one minute time) x K1 x K2
For Vane type anemometers:
You only need to correct for the air probe geometry (K2). The actual air velocity
is as follows:
Actual Value = Measured Value (Average value over one minute time) x K2
Model No. Description @ 2.5 m/s @5 m/s @10 m/s @15 m/s
FMA-904 Hot Wire 0-2000 FPM 1.04 1.00 1.01 N/A
FMA-905 Hot Wire 0-5000 FPM 1.00 1.00 1.01 1.04
HHF42 Hot Wire 40-3940 FPM 1.04 1.00 1.06 1.07
HHF801 Vane Type 160-2358 FPM 1.08 1.12 1.17 N/A
HHF802 Vane Type 80-4930 FPM 0.90 0.96 1.04 1.07
HHF803 Vane Type 160-4930 FPM 0.94 1.00 1.09 1.06
HHF91 Vane Type 125-4900 FPM 0.86 0.92 1.00 1.03
HHF92A Vane Type 80-6900 FPM 0.92 0.97 1.05 1.04
HHF81 Vane Type 80-5910 FPM 1.03 1.06 1.13 1.12
HHF82 Vane Type 80-5910 FPM 1.14 1.18 1.24 1.22
HHF11 Vane Type 80-6900 FPM 0.88 0.90 0.99 1.01

Example 1:
An FMA-904 Hot wire anemometer is being checked in the Wind Tunnel
at 2.5 m/s (492 FPM) air speed. The Environmental conditions are:
Barometric Pressure = 27.88 inches of Hg
Ambient Temperature = 80 ºF
The FMA-904 measures 442 FPM. Calculate the actual air speed:
Actual Air speed = Measured Value (Average value over one minute time) x
K1 x K2
K1 = (29.92/P) x (460 + T)/530
K1 = (29.92/27.88) x (460 + 80)/530
K1 = 1.093
From Table 1, K2 for FMA-904 @ 2.5 m/s is 1.04
Actual Air speed = 442 x 1.093 x 1.04
Actual Air speed = 502 FPM
Example 2:
An HHF92A Vane type anemometer is being checked in the Wind Tunnel at
15 m/s (2953 FPM). The HHF92A measures 2848 FPM. Calculate the actual air
speed:
Actual Air speed = Measured Value (Average value over one minute time) x K2
From Table 1, K2 for HHF92A @ 15 m/s is 1.04
Actual Air speed = 2848 x 1.04
Actual Air speed = 2962 FPM
Operation 2
7

Chapter 3 - Specifications
Accuracy: ±1% of setting or ±0.1 m/s, whichever is larger
Test Chamber: 10 cm (4") diameter
Flow Rates: 2.5 m/s (492 fpm), 5.0 m/s (984 fpm), 10 m/s
(1969 fpm), 15 m/s (2953 fpm)
Remote Option: Use an external 5K, 10-turn potentiometer
to vary air speed
DC Motor: 24 Vdc @ 1.1 A (26 W)
Power: 90 to 250 Vac @ 50/60 Hz
Operating Temperature: 5 to 45°C (41 to 113°F)
Operating Relative Humidity: 80% RH max without condensation
Size:
Weight:
8
Specifications
3
Storage Temperature:
68.5 L x 20.3 W x 29.2 cm H (27 x 8 x
11.5") 8.2 kg (18 lb)
Equipment is for indoor use only.
-40°C (-40°F)
to 71°C (160°F)

PROBLEM SOLUTION
?
?
?
?
9
In Case of Problems 4
The wind tunnel is not on -
no power to control box
Check the fuse in the motor control box - if
blown, replace with same type and rating.
"CAUTION: For continued protection against the risk of
fire, replace with only the same type, rating and size of
fuse. Disconnect power from the source before changing
the fuse."
The wind tunnel is on - fan
does not turn. Make sure the cable from the fan is connected to
the motor control box.
Make sure the power switch on the motor control
box is “ON”.
Make sure there are no obstructions around the
fan area of the wind tunnel.
Can’t get velocity desired. Check your AC power.
Check the position of the selector switch on the
motor control box.
Poor repeatability. Locate the wind tunnel in room that has AT
LEAST 1800 cubic feet of space.
Make sure the motor control box is plugged in
and connected to a live outlet. Turn on power
switch

Chapter 5 - Maintenance
The following points should be adhered to for a maintenance-free operation of
the wind tunnel.
• Make sure the wind tunnel is operating in a relatively dirt-free room. Follow
the precaution tips.
Chapter 6 - Spare and Replacement Parts
10
Maintenance
5
Part Number Description
WTM-0014 Honeycomb flow straightener
WTM-0009 Chamber Window Cover (Solid)
IR-0032C Remote Connection Cable
•There are no special instructions for cleaning the unit.
•This unit has non serviceable parts. If needed, contact Omega for necessary
repairs.

11
WTM-1000 Laboratory Grade, Bench Top Mini Wind Tunnel
Notes

12
Notes
WTM-1000 Laboratory Grade, Bench Top Mini Wind Tunnel

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords
our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2014 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the
prior written consent of OMEGA ENGINEERING, INC.
FOR WARRANTY RETURNS, please have the
following information available BEFORE contacting
OMEGA:
1. Purchase Order number under which the product
was PURCHASED,
2. Model and serial number of the product under
warranty, and
3. Repair instructions and/or specific problems
relative to the product.
FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have
the following information available BEFORE
contacting OMEGA:
1. Purchase Order number to cover the COST
of the repair,
2. Model and serial number of the product, and
3. Repair instructions and/or specific problems
relative to the product.
RETURN REQUESTS/INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED
RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID
PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return
package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.
WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a
period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month
grace period to the normal one (1) year product warranty to cover handling and shipping time. This
ensures that OMEGA’s customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service
Department will issue an Authorized Return (AR) number immediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not
limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for
any damages that result from the use of its products in accordance with information provided
by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the
company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF
TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.

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