TSI Incorporated VelociCalc 8345 Operation manual

Model 8345/8346/8347/8347A
VELOCICALC®
Air Velocity Meters
Operation and Service Manual
1980277, Revision E
November 2002
Ventilation Testing/Balancing

Model 8345/8346/8347/8347A
VELOCICALC®
Air Velocity Meters
Operation and Service Manual
1980277, Revision E
November 2002
U.S. INTERNATIONAL
Sales and Sales and
Customer Service: Customer Service:
[phone] (001 651) 490-2811
[phone]
Fax: Fax:
[phone] (001 651) 490-3824
SHIP/MAIL TO: E-mail address:
TSI Incorporated [email protected]
500 Cardigan Road Website:
Shoreview, MN 55126-3996 USA www.tsi.com

Copyright
TSI Incorporated / August 2000–2002 / All rights reserved.
Address
TSI Incorporated / 500 Cardigan Road / Shoreview, MN 55126 /
USA
Fax No.
[phone]
LIMITATION OF WARRANTY AND LIABILITY. Seller warrants
the goods sold hereunder, under normal use and service as described in
the operator's manual, shall be free from defects in workmanship and
material for twenty-four (24) months, or the length of time specified in
the operator's manual, from the date of shipment to the customer. This
warranty period is inclusive of any statutory warranty. This limited
warranty is subject to the following exclusions:
a. Hot-wire or hot-film sensors used with research anemometers, and
certain other components when indicated in specifications, are
warranted for 90 days from the date of shipment.
b. Parts repaired or replaced as a result of repair services are
warranted to be free from defects in workmanship and material,
under normal use, for 90 days from the date of shipment.
c. Seller does not provide any warranty on finished goods
manufactured by others or on any fuses, batteries or other
consumable materials. Only the original manufacturer's warranty
applies.
d. Unless specifically authorized in a separate writing by Seller,
Seller makes no warranty with respect to, and shall have no
liability in connection with, goods which are incorporated into
other products or equipment, or which are modified by any person
other than Seller.
The foregoing is IN LIEU OF all other warranties and is subject to the
LIMITATIONS stated herein. NO OTHER EXPRESS OR IMPLIED
WARRANTY OF FITNESS FOR PARTICULAR PURPOSE OR
MERCHANTABILITY IS MADE.
TO THE EXTENT PERMITTED BY LAW, THE EXCLUSIVE
REMEDY OF THE USER OR BUYER, AND THE LIMIT OF
SELLER'S LIABILITY FOR ANY AND ALL LOSSES, INJURIES, OR
DAMAGES CONCERNING THE GOODS (INCLUDING CLAIMS

BASED ON CONTRACT, NEGLIGENCE, TORT, STRICT LIABILITY
OR OTHERWISE) SHALL BE THE RETURN OF GOODS TO
SELLER AND THE REFUND OF THE PURCHASE PRICE, OR, AT
THE OPTION OF SELLER, THE REPAIR OR REPLACEMENT OF
THE GOODS. IN NO EVENT SHALL SELLER BE LIABLE FOR ANY
SPECIAL, CONSEQUENTIAL OR INCIDENTAL DAMAGES.
SELLER SHALL NOT BE RESPONSIBLE FOR INSTALLATION,
DISMANTLING OR REINSTALLATION COSTS OR CHARGES. No
Action, regardless of form, may be brought against Seller more than 12
months after a cause of action has accrued. The goods returned under
warranty to Seller's factory shall be at Buyer's risk of loss, and will be
returned, if at all, at Seller's risk of loss.
Buyer and all users are deemed to have accepted this LIMITATION OF
WARRANTY AND LIABILITY, which contains the complete and
exclusive limited warranty of Seller. This LIMITATION OF
WARRANTY AND LIABILITY may not be amended, modified or its
terms waived, except by writing signed by an Officer of Seller.
Service Policy
Knowing that inoperative or defective instruments are as detrimental to
TSI as they are to our customers, our service policy is designed to give
prompt attention to any problems. If any malfunction is discovered,
please contact your nearest sales office or representative, or call TSI's
Customer Service department at [phone] (USA) and (1) 651-490-
2811 (International).

CONTENTS
Chapters
1. Unpacking and Parts Identification ......1
Parts Identification .................................... 2
2. Setting-Up................................................ 5
Supplying Power to the VELOCICALC......... 5
Installing the Batteries ............................ 5
Using the Optional AC Adapter ..............5
Auto Power Off Feature .......................... 6
Selecting the Display Units ....................... 6
Using The Telescoping Probe .................. 7
Extending The Probe .............................. 7
Retracting The Probe.............................. 7
Articulating Probe (Model 8346/8347A)....8
3. Operation ................................................. 9
Overview ................................................... 9
Keypad Functions ..................................... 9
ON/OFF Key ............................................. 9
Measuring Velocity ................................. 10
Measuring Temperature ......................... 10
Flow Rate Function ................................. 11
Entering Shape and Size...................... 11
Humidity Function (Model 8347/8347A) . 12
Entering Barometric Pressure .............. 12
Time Constant Function.......................... 13

Using the Clear, Sample and Statistics
Functions ................................................ 14
Sample Function................................... 14
Statistics Function................................. 15
Clear Function ...................................... 16
Printer Port.............................................. 16
4. Maintenance .......................................... 19
Probe Tip ................................................ 19
Recalibration ........................................... 19
Cases ...................................................... 20
Storage ................................................... 20
5. Troubleshooting.................................... 21
Appendixes
A Specifications ........................................ 25
B DIP Switch Settings ............................... 29
C Standard Velocity vs. Actual Velocity..31

1
Chapter 1
Unpacking and Parts
Identification
Carefully unpack the instrument and accessories
from the shipping container. Check the individual
parts against the list of components in Table 1. If
any are missing or damaged, notify TSI or your
local distributor immediately.
Table 1. List of Components
Qty Item Description Part/model
1 Model 8345 VELOCICALC or
Model 8346 VELOCICALC or
Model 8347 VELOCICALC or
Model 8347A VELOCICALC
8345
8346
8347
8347A
1 Carrying Case (8345/46) or
Carrying Case (8347/47A)
1319125
1319114
4 AA Alkaline batteries 1208013
1 AC Adapter (Optional)
115 V, NEMA-5
230 V, European CEE 7/16
230 V, Great Britain
240 V, Australian
2613033
2613078
800169
2613105
1 Operation and Service Manual 1980277

Chapter 1
2
Parts Identification
12
3
4
1. Keypad
2. Display
3. Printer Interface Port
4. Battery Access Cover

5
Chapter 2
Setting-Up
Supplying Power to the VELOCICALC
The VELOCICALC can be powered in one of two
ways: four size AA batteries or the optional AC
adapter.
Installing the Batteries
Insert four AA batteries as indicated by the
diagram located on the inside of the battery
compartment. TSI ships the unit with alkaline
batteries. The VELOCICALC is designed to
operate with either alkaline or NiCd
rechargeable batteries. Carbon-zinc batteries
are not recommended because of the danger of
battery acid leakage. The typical battery life for
alkaline batteries at 20°C at 150 ft/min is
10 hours.
Using the Optional AC Adapter
The optional AC adapter allows you to power
the VELOCICALC from a wall outlet. When
using the AC adapter, the batteries (if installed)
will be bypassed. The AC adapter is not a
battery charger.

6Chapter 2
Auto Power Off Feature
The VELOCICALC’s auto power off feature will
automatically power the instrument off after a
specified time. In velocity mode, the instrument
will power off after 15 minutes provided that
the velocity is zero and no keys have been
pressed during this time. In temperature mode,
the instrument will power off after 15 minutes if
no keys have been pressed. This feature can be
turned off if desired by switching DIP switch #5
to the OFF position. See Appendix B, DIP
Switch Settings.
(Note: Any samples taken will not be lost if the
VELOCICALC automatically powers off.)
Selecting the Display Units
The VELOCICALC is capable of displaying the
measured values in several different measurement
units, as shown in Table 2-2.
Table 2-2. Choices of Measurement Units
Velocity Temperature Flow Rate
ft/min °F ft3/min
m/s °C m3/hr
l/s

Setting-Up 7
If you wish to change the display units on your
VELOCICALC,see Appendix B, “DIP Switch
Settings.”
Using The Telescoping Probe
The telescoping probe of the VELOCICALC contains
the velocity, temperature, and humidity sensors.
When using the probe, make sure the sensor
window is fully exposed and the orientation dot 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.
Retracting The Probe
To retract the probe, hold the handle in one
hand while pushing on the probe tip with the
other hand. If you feel the probe antenna
binding, pull gently on the probe cable until
the smallest antenna section is retracted.
Collapse the rest of the antenna by pressing the
probe tip. Do not hold the cable while
retracting the probe as this prevents the probe
from moving.

8Chapter 2
Articulating Probe (Model 8346/8347A)
The articulating probe has the ability to bend at a
90° angle for those hard to reach places. To bend
the probe of the Model 8347A, loosen the knurled
nut on the joint, bend the probe, and tighten the nut.
To straighten the probe, loosen the nut, straighten
the probe, and tighten the nut.

9
Chapter 3
Operation
Overview
The Model 8345/46 VELOCICALC measures air
velocity and temperature and calculates volumetric
flow rate. The Model 8347/47A measures air
velocity, temperature, volumetric flow rate,
humidity, dew point temperature, and wet bulb
temperature. Models 8346 and 8347A have an
articulating probe. The VELOCICALC can compute
statistics for groups of readings.
Keypad Functions
When pressing the keys on the front panel, the
VELOCICALC will beep to confirm the function. If
you press a key and the VELOCICALC does not
beep, then the VELOCICALC does not allow that
function during the selected mode. The beep
function can be disabled by changing the internal
DIP switch (refer to Appendix B).
ON/OFF Key
Press the ON/OFF key to turn the VELOCICALC on
and off. When the instrument is first turned on it
goes through a preprogrammed power-up sequence

10 Chapter 3
that includes an internal self-check. First, all
displayable items will appear for a few seconds. If
a problem is detected, the display will light ‘CAL’
to indicate that it should be returned for servicing
and calibration.
Measuring Velocity
Press the VELOCITY key to display velocity
measurements (the VELOCICALC will automatically
start in velocity mode). The velocity will be
displayed in ft/min or m/s depending on the DIP
switch settings (refer to Appendix B). Place the
end of the probe in the location where you want to
make the measurement. Make sure the sensor
window is fully opened and the red orientation dot
is facing upstream.
Measuring Temperature
Press the TEMP key to display air temperature
readings. The VELOCICALC will display
temperature readings in either degrees Celsius (°C)
or degrees Fahrenheit (°F), depending on the DIP
switch settings (refer to Appendix B). Allow about
30 seconds for the temperature reading to stabilize
after switching to temperature mode. This is
necessary because the velocity sensor is heated
during velocity mode, and some heat is conducted
down to the temperature sensor.

Operation 11
Flow Rate Function
The VELOCICALC’s flow rate function can calculate
flow rate using a known area. The VELOCICALC
displays the volumetric flow rate in ft3/min, m3/hr,
or l/s, depending on the DIP switch setting (refer to
Appendix B). The flow rate can be calculated for a
round, square or rectangular duct. The shape and
size of the duct or other area through which the
flow will be measured must be entered.
Entering Shape and Size
Press the FLOWRATE key to put the
VELOCICALC in flow rate mode. The
VELOCICALC will prompt the user to enter the
shape and size, if this has not been done since
the instrument was turned on. The
VELOCICALC will request entry of the shape by
alternately displaying the rectangle and the
circle. If shape and size have been entered, the
VELOCICALC will go directly to displaying
flow rate.
Press the up and down arrow keys (ÏÐ) to
select the shape of the area, rectangular
(square) or circular, to measure. Each time an
up or down arrow key (ÏÐ) is pressed, the
display will toggle between the circle and
rectangle. When the desired shape appears on
the display press either the ENTER or

12 Chapter 3
FLOWRATE key. This will enter the shape
and the VELOCICALC will then ask for the size.
Use the up and down arrow keys (ÏÐ) to
select the size of the flow rate area. For a
circular flow shape the VELOCICALC will ask
for one size, the diameter of the circular area.
Select the size and press either the ENTER or
FLOWRATE key to accept it. For a
rectangular area the VELOCICALC will ask for
two dimensions. First select the X dimension
and press either the ENTER or FLOWRATE
key, then select the Y dimension and press
either the ENTER or FLOWRATE key.
To change the shape or dimensions after they
have been entered, press the up and down
arrow keys (ÏÐ). Proceed as above to enter
the shape and dimensions.
Humidity Function (Model 8347/8347A)
Press the HUMIDITY key to toggle between
displaying % relative humidity, dew point
temperature, and wet bulb temperature. NOTE: To
display accurate wet bulb temperature, the correct
barometric pressure must be entered.
Entering Barometric Pressure
While wet bulb temperature is displayed, press
the up or down arrow key to display

Operation 13
barometric pressure. Use the arrow keys to
change the barometric pressure and press
ENTER to accept it and return to measuring
mode.
NOTE: For temperature and humidity
measurements, make sure that at least 3 inches (7.5
cm) of the probe is in the flow to allow the
temperature and humidity sensors to be in the air
stream.
Time Constant Function
Momentarily press and release the TIME
CONSTANT key to view the current time constant.
To change the time constant, press and hold the
key. The available time constant choices (1, 5, 10,
15 and 20 seconds) will sequence on the display.
When the desired value is displayed immediately
release the key.
The VELOCICALC will always store the chosen time
constant when the meter is turned off. When the
VELOCICALC is turned on again, the last time
constant is used.
The time constant is actually an averaging period.
The VELOCICALC display is always updated every
second, however, the reading displayed is the
average reading over the last time constant period.

14 Chapter 3
For example, if the current time constant is set to
10 seconds, the display will show readings
averaged over the previous 10 seconds, updated
every second. This is also called a 10 second
“moving average.”
Using the Clear, Sample and Statistics
Functions
The VELOCICALC has the ability to compute the
average of a number of individual sampled
readings. When the SAMPLE key is pressed, the
currently displayed reading is added to a sample
buffer. When the STATISTICS key is pressed, the
sum of the readings in the sample buffer is divided
by the number of sampled readings to get the
average. The CLEAR key is used to clear out the
sample buffer in order to start taking a new
average.
Sample Function
Press the SAMPLE key to start the sample. The
display will flash “SAMPLE” for one time
constant and a number indicating the number of
sampled readings that are in memory. Then the
sampled value will be displayed.
The individual sampled values cannot be
recalled. Only the statistics of the sampled
values can be recalled. There are five different