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VELOCICALC®
AIR VELOCITY METER
MODEL 9535/9535-A
OPERATION AND SERVICE MANUAL
P/N 1980563, REVISION H
FEBRUARY 2016
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CONTENTS
CHAPTER 1 UNPACKING AND PARTS IDENTIFICATION ............ 1
CHAPTER 2 SETTING-UP ................................................................. 3
Supplying Power to the Model 9535/9535-A .................................. 3
Installing the Batteries ............................................................... 3
Using the Optional AC Adapter ................................................. 3
Using the Telescoping Probe ......................................................... 3
Extending the Probe .................................................................. 3
Retracting the Probe.................................................................. 3
Connecting to a Computer .............................................................. 4
CHAPTER 3 OPERATION ................................................................. 5
Keypad Functions ........................................................................... 5
Common Terms .............................................................................. 5
Menus ............................................................................................. 6
DISPLAY SETUP ................................................................................. 6
SETTINGS ......................................................................................... 6
FLOW SET UP .................................................................................... 6
ACTUAL/STANDARD SETUP ................................................................ 6
DATA LOGGING ................................................................................. 7
Measurements ........................................................................... 7
Delete Data ................................................................................ 7
% Memory ................................................................................. 7
LogDat2™ Downloading Software ................................................. 7
CHAPTER 4 MAINTENANCE ............................................................ 9
Recalibration ................................................................................... 9
Cases .............................................................................................. 9
Storage ........................................................................................... 9
CHAPTER 5 TROUBLESHOOTING ................................................ 11
APPENDIX A SPECIFICATIONS ..................................................... 13
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N o t e
For temperature measurements, make sure that at least 3 inches
(7.5 cm) of the probe is in the flow to allow the temperature sensor to
be in the air stream.
Chapter 2
Setting-up
Supplying Power to the Model 9535/9535-A
The TSI Model 9535/9535-A VelociCalc Air Velocity Meter is powered
with four size AA batteries.
Installing the Batteries
Insert four AA batteries as indicated by the diagram located on
the inside of the battery compartment. The Model 9535/9535-A is
designed to operate with either alkaline or NiMH rechargeable
batteries, although it will not recharge NiMH batteries. Battery life
will be shorter if NiMH batteries are used. Carbon-zinc batteries
are not recommended because of the danger of battery acid
leakage.
Using the Optional AC Adapter
When using the AC adapter, the batteries (if installed) will be
bypassed. Be sure to provide the correct voltage and frequency,
which is marked on the back of the AC adapter. The AC adapter
will not recharge the batteries.
Using the Telescoping Probe
The telescoping probe contains the velocity, temperature, and
humidity sensors. When using the probe, make sure the sensor
window is fully exposed and the orientation dimple is facing upstream.
Extending the Probe
To extend the probe, hold the handle in one hand while pulling on
the probe tip with the other hand. Do not hold the cable while
extending the probe as this prevents the probe from extending.
Retracting the Probe
To retract the probe, hold the handle in one hand while pulling
gently on the probe cable with the other hand.
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Connecting to a Computer
C a u t i o n
This symbol is used to indicate that the data port of the Model
9535/9535-A is not intended for connection to a public
telecommunications network. Connect the USB data port only to
another USB port.
Use the Computer Interface USB Cable provided with the Model
9535/9535-A to connect the instrument to a computer for
downloading stored data.
For more information on how to download stored data see Chapter 3
section titled LogDat2™ Downloading Software.
4 Chapter 2
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ON/OFF Key
Press to turn the Model 9535/9535-A on and off.
During the power up sequence the display will
show the following: Model Number, Serial Number,
Software Revision and Last Date Calibrated.
Arrow () Keys
Press to scroll through choices while setting a
parameter.
(Enter) Key
Press to accept a value or condition.
Arrow (or ) and
Menu Soft Keys
Press arrow keys to change choices while setting a
parameter. Press the Menu soft key to select the
Menu selections, which are Display Setup,
Settings, Flow Setup, Actual/Std Set up, Data
Logging, and Calibration.
Sample
Consists of all of the measurement parameters
stored at the same time.
Test ID
A group of samples. The statistics (average,
minimum, maximum, and count) are calculated for
each test ID. The maximum number of test IDs is
100.
Time Constant
The time constant is an averaging period. It is used to
dampen the display. If you are experiencing
fluctuating flows, a longer time constant will slow
down those fluctuations. The display will update every
second, but the displayed reading will be the average
over the last time constant period. For example, if the
time constant is 10 seconds, the display will update
every second, but the displayed reading will be the
average from the last 10 seconds. This is also
referred to as a “moving average”.
Chapter 3
Operation
Keypad Functions
Common Terms
In this manual there are several terms that are used in different
places. The following is a brief explanation of the meanings of those
terms.
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Menus
N o t e
The horn numbers are the models of the horns. For example, 100
refers to a horn model number AM 100. Only horns with Model
numbers as follows can be used with this function: AM 100, AM 300,
AM 600, and AM 1200. If a horn model number is chosen, the
instrument will return to measuring mode and use a preprogrammed
curve to calculate flow rate from velocity.
DISPLAY SETUP
Display setup menu is where you will setup the desired parameters to
be displayed on the running screen. With a parameter highlighted you
can then use the ON soft key to have it show up on the running
screen or select the OFF soft key to turn off the parameter. Use
PRIMARY soft key to have a parameter show up on the running
screen in a larger display. Only one parameter can be selected as a
primary, and up to 2 secondary parameters can be selected at one
time.
SETTINGS
Settings menu is where you can set the general settings. These
include Language, Beeper, Select Units, Time Constant, Contrast,
Set Time, Set Date, Time Format, Date Format, Number Format,
Backlight and Auto Off. Use the or soft keys to adjust the
settings for each option and use the key to accept settings.
FLOW SET UP
In Flow Setup mode, there are 4 types: Round Duct, Rectangle Duct,
Duct Area and Horn. Use the or soft keys to scroll through the
types and then press the key to accept the desired type. To
change the value, highlight the Enter Settings option and press the
key. Use the instructions below to change the value of the type that
you selected.
ACTUAL/STANDARD SETUP
Choose Actual/Standard measurements and parameters in the
Act/Std Setup menu. Within this menu, the user can also select
Standard Temperature, Standard Pressure and a source for the
actual temperature. The actual barometric pressure must be entered
to convert air velocity and volume measurements to actual conditions.
6 Chapter 3
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DATA LOGGING
Measurements
Measurements to be logged are independent of measurements
on the display, and must therefore be selected under DATA
LOGGING Measurements.
Delete Data
Use this to delete all data, delete test or delete sample.
% Memory
This option displays the memory available. Delete All, under
Delete Data, will clear memory and reset the memory available.
LogDat2™ Downloading Software
The TSI Model 9535/9535-A comes with special software called
LogDat2 Downloading Software, which is designed to provide you
with maximum flexibility and power. To install this software on your
computer, follow the instructions on the label of the LogDat2 CDROM.
To download data from the Model 9535/9535-A, connect the supplied
computer interface USB cable to the Model 9535/9535-A and to a
computer USB port. Then run the LogDat2 software. Within the
LogDat2 software, either select the tests to be downloaded or doubleclick on a test to open it.
Operation 7
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Symptom
Possible Causes
Corrective Action
No Display
Unit not turned on
Switch unit on.
Low or dead batteries
Replace batteries or plug
in AC adapter.
Dirty battery contacts
Clean the battery
contacts.
Velocity reading
fluctuates unstable
Fluctuating flow
Reposition probe in
less-turbulent flow or use
longer time constant.
No response to
keypad
Keypad locked out
Unlock keypad by
pressing keys
simultaneously.
Instrument Error
message appears
Memory is full
Download data if desired,
then DELETE ALL
memory.
Fault in instrument
Factory service required
on instrument.
Chapter 5
Troubleshooting
Table 5-1 lists the symptoms, possible causes, and recommended
solutions for common problems encountered with the Model
9535/9535-A. If your symptom is not listed, or if none of the solutions
solves your problem, please contact TSI.
Table 5-1: Troubleshooting the Model 9535/9535-A
Remove the probe from excessive temperature immediately:
excessive heat can damage the sensor. Operating temperature limits
can be found in Appendix A, Specifications.
W A R N I N G !
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Appendix A
Specifications
Specifications are subject to change without notice.
Velocity:
Range: 0 to 6000 ft/min (0 to 30 m/s)
Accuracy
Resolution: 1 ft/min (0.01 m/s)
Duct Size:
Range: 1 to 250 inches in increments of 0.1 in. (1 to 635 cm
Volumetric Flowrate:
Range: Actual range is a function of actual velocity, pressure,
Temperature:
Range: 0 to 200°F (-18 to 93°C)
Accuracy3: ±0.5°F (±0.3°C)
Resolution: 0.1°F (0.1°C)
1&2
: ±3% of reading or ±3 ft/min (±0.015 m/s), whichever
is greater
in increments of 0.1 cm)
duct size, and K factor
Instrument Temperature Range:
Operating (Electronics): 40 to 113°F (5 to 45°C)
Operating (Probe): 0 to 200°F (-18 to 93°C)
Storage: -4 to 140°F (-20 to 60°C)
Instrument Operating Conditions:
Altitude up to 4000 meters
Relative humidity up to 80% RH, non-condensing
Pollution degree 1 in accordance with IEC 664
Transient over voltage category II
Data Storage Capabilities:
Range: 12,700+ samples and 100 test IDs (one sample can
contain fourteen measurement types)
Time Constant:
User-selectable
Response Time:
Velocity: 200 msec
Temperature: 2 minutes (to 66% of final value)
External Meter Dimensions:
3.3 in. 7.0 in. 1.8 in. (8.4 cm 17.8 cm 4.4 cm)
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Meter Probe Dimensions:
Probe length: 40 in. (101.6 cm)
Probe diameter of tip: 0.28 in. (7.0 mm)
Probe diameter of base: 0.51 in. (13.0 mm)
Articulating Probe Dimensions:
Articulating section length: 6.0 in. (15.24 cm)
Diameter of articulating knuckle: 0.38 in. (9.5 mm)
Meter Weight:
Weight with batteries: 0.6 lbs (0.27 kg)
Power Requirements:
Four AA-size batteries (included) or AC adapter 9 VDC, 300 mA min.
1
Temperature compensated over an air temperature range of 40 to 150°F (5 to
65°C).
2
The accuracy statement of ±3.0% of reading or ±3 ft/min (±0.015 m/s), whichever is
greater, begins at 30 ft/min through 6000 ft/min (0.15 m/s through 30 m/s).
3
Accuracy with instrument case at 77°F (25°C), add uncertainty of 0.05°F/°F
(0.03°C/°C) for change in instrument temperature.
14 Appendix A
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