Clavis Type 7 Manual de usuario
CLAVIS Belt Frequency
Meter Type 7
User Manual
General safety tips
Safety first – read and understand this manual before
operating the CLAVIS Belt Frequency Meter.
Never use your CLAVIS Belt Frequency Meter on moving belts.
Switch off and isolate any
belt drive system prior to
taking tension measurements
or attempting any other
installation work.
Do not drop the meter or
subject either the meter or
the sensor to other sharp
impact.
Do not put water, solvents
(including cleaning solutions)
or any other liquid on the
unit. Clean meter and
sensor with dry cotton cloth.
Do not pull on sensor cable.
Disconnect sensor from
meter by grasping the
connector grip only.
Do not leave the unit in
places that are humid, hot,
dust filled or in direct
sunlight.
Hint:When CLAVIS Belt
Frequency Meter is not used
for a while, remove batteries
and store unit in the case
provided.
Do not use your CLAVIS Belt
Frequency Meter in any
potentially explosive
environment.
Do not disassemble or
attempt to modify either the
meter or the sensing head.
Table of contents
1.0 Device description 4
2.0 Quick start 5
3.0 Functions
3.1 Keys 6
3.2 Audio/ visual display 7
3.3 Optical sensor 8
3.4 Acoustic Sensor 8
3.5 Battery condition 9
3.6 Charging batteries 10
3.7 RS232C serial communication 10
4.0 Setup & use 11
5.0 Operating tips 13
6.0 Meter range 14
7.0 Calibration
7.1 Spot check 15
7.2 Annual certification 16
8.0 Technical specification 17
9.0 Useful formulae and conversions 18
Appendix
1.0 Theory of operation 19
2.0 Limited warranty 20
3.0 Weights and tension values 21
page
4
1.0 Device description
The CLAVIS Belt Frequency Meter is a two component system consisting of
a hand-held meter attached to an sensor via an electronic cable.Two differing
types of sensor are used with the CLAVIS meter.The first is the acoutic sensor
which is available in a range of sizes and profiles.The second is an optical sen-
sor which uses an infrared beam to detect the vibration of a belt strand and
sends a signal to the meter.The detected belt vibration signal is compared with
the vibration of a quartz crystal by the the meter which then computes the
natural frequency of the belt.The result is shown in the display window as hertz
(oscillations per second).The internal programming of the meter is also able to
report the belt tension in units of force (either newton or pounds-force)
provided the operator has entered the belt mass and span length using the
manually operated key pad.
LED aiming
beam
Optical sensor
see section 3.3
Plug in
sensor cable
Display window see
section 3.2
Keypad
see
section
3.1
Acoustic sensor
see section 3.4
LED aiming
beam
Optical sensor
see section 3.3
Plug in
sensor cable
Display window see
section 3.2
Keypad
see
section
3.1
Aco
ust
ic
sen
sor
see section 3.4
5
2.0 Quick start
1. Plug in sensor
2. Press to switch
meter on
3.Aim sensor
at belt, gap 5
to 25 mm
4.Tap or
pluck belt
5. Read belt
frequency (Hz)
or
1. Plug in
sensor
2. Press
to switch
meter on
3. Hold sen-
sor across
the belt. En-
sure that the
sensor does
not touch the
belt
4.Tap or
pluck belt
5. Read belt
frequency (Hz)
6
3.0 Functions
3.1 Keys
ON/OFF
SPAN
(m)
MASS
(kg/m)
UP
(Hz/N)
DOWN
(Lbs)
MEM 1
MEM 2
MEM 3
This key switches the meter on or off. If the meter is on and sits idle
for more than 3 minutes, it automatically switches off to preserve bat-
tery life.When the meter is first switched on a battery check is made
see Section 3.4 for a description
This key is used to enter the belt span length.The span key is held
down while the UP or DOWN keys are used to set the belt span in
metres. Releasing the SPAN key results in an audible beep to indicate
the setting has been accepted. Pressing the SPAN key alone, shows the
current setting.
This key is used to enter the belt mass.The mass key is held down
while the UP or DOWN keys are used to set the belt mass in kg/m.
Releasing the MASS key results in an audible beep to indicate the
setting has been accepted. Pressing the MASS key alone shows the
current setting.
Important Note:
Belt span and belt mass are required entries if tension results in force units
(N or lbf) are desired. Entries must be in SI units (m and kg/m)
This key has two functions.The first is to increase either the SPAN
or MASS parameters when used in conjunction with these keys.The
second use is to toggle between the Hz and the newton measure-
ment modes.
This key has two functions.The first is to decrease either the SPAN
or MASS parameters when used in conjunction with those keys.The
second use is to toggle between the Hz and the pound measurement
modes.
The memory keys allow up to 3 sets of belt parameters to be stored
in the meter registry. Pressing the MEM 1 key recalls the first set of
belt parameters and likewise for MEM 2 and MEM 3.
To store the belt parameters to a key, the belt span and mass param-
eters must first be entered and then immediately after release of
either the SPAN or MASS keys the appropriate MEM key should be
pressed.Two beeps indicate that the parameters have been successfully
assigned to the key.
7
3.2 Audio/visual display
The CLAVIS Belt Frequency Meter is an interactive tool. It provides both visual
and audible communication with the operator. Each signal or combination of
signals has a meaning.While all these signals are discussed in other sections of
this manual, a compilation of all the available signals will be presented here.
Generally visual signals alone give measurement results while audible signals, ei-
ther alone or in combination with a visual signal, indicate some operational step.
Tension displayed
in newton
Frequency mode,
results displayed as hertz
Tension displayed
in pound-force.
Visual
measurement
results
A line segment will
appear to indicate the
units associated with the
number displayed
Audible signals
Signal When Means
One Beep Upon release of “Span” key Input accepted
One Beep Upon release of “Mass” key Input accepted
One Beep While sensor is aimed at vibrating
belt
Measurement taken
Two Beeps Upon pushing “Memory” key after
releasing “Span” key
Span data has been stored
Upon pushing “Memory” key after
releasing 'Mass' key
Mass data has been stored
Four Beeps Combined with “0000” N display Newton result is out of range
Combined with “0000” lb display Pound result is out of range
After pushing “On” key combined
with “zero” countdown
Low battery condition
N
Hz
lbs
N
Hz
lbs
N
Hz
lbs
8
3.3 Optical sensor
The sensor uses an invisible infrared beam
to detect vibrations of the belt.A nar-
row angle orange LED generated beam is
provided to guide the aiming of the sensor.
The very best signal from the belt is seen
when the sensor is held perpendicular to the
belt at the centre of the span at 9,5 mm (3/8
in) distance.When physical restrictions are
present, it is possible to get useable readings
with the sensor up to 50 mm (2 in) distance
from the belt and/or tipped up to 45° from
perpendicular.
It is possible to take measurements from the
edge of the belt.The toothed side of a belt is
equally acceptable as a target for the sensor.
The sensor LEDs should be kept clean by
wiping with a soft cotton cloth. Solvents are
never to be used.
3.4 Acoustic sensor
The acoustic sensor uses a CLAVIS patented
technique for detecting the belt vibration
signal whilst minimising ambient noise.The
acoustic sensor is particularly suitable for
belts which vibrate poorly or where the
amplitude of belt vibration is very small.The
'jaws' of the sensor should be positioned over
the centre of the belt and placed mid length
of the belt span.The sensor should not be
allowed to touch the belt as this will reduce
the belt vibration signal.A range of sensors
is available to suit belts of differing widths.
The standard Type 3 sensor is suitable for all
automotive applications.
9
3.5 Battery condition
When the CLAVIS Belt Frequency Meter is first switched on, a battery condi-
tion check is automatically performed.A low battery condition is signalled both
visually and audibly.The display window will flash an array of zeros, starting with
four and progressing to only one.There will be an audible signal of four “beeps”
as the display changes
If these signals are seen and heard, batteries should be replaced. Batteries are
accessed through the removable cover on the back of the meter. New batteries
should be inserted within 30 seconds of removal of old batteries.Taking longer
risks loss of any data stored by the memory keys. Batteries are expected to
provide approximately 20 hours of continuous operation before replacement
is required when the optical sensor is used. Over 100 hours of use is possible
when the acoustic sensor is used.
N
Hz
lbs
N
Hz
lbs
N
Hz
lbs
N
Hz
lbs
BEEP
BEEP
BEEP
BEEP
10
3.6 Charging batteries
Do not charge batteries with the sensor head attached to the meter. Do not
attempt to use the meter while batteries are being charged.
The CLAVIS Belt Frequency Meter is compatible with rechargeable
batteries and charging unit.A convenient 3,5 mm, positive centre charging
socket is located on the bottom end of the meter body adjacent to the sensor
cable plug-in port.
Batteries: 1 300 mAh minimum (IDS accessory)
Charging unit: 12 to 15 volt DC output (IDS accessory)
Connection: 3,5 mm positive tip mini plug/socket
The built in circuit of the meter controls the charging current. Charging current
is internally limited to 100 mA. Charging time is typically 12 to 14 hours for a
full charge.
You may turn the unit on while charging.The meter’s software will then signal
that the batteries are charging.The display window will flash an array of zeros,
starting with only one and progressing to four.There will be an audible signal of
four 'beeps' as the display changes.
Suitable rechargeable batteries and charger may be obtained directly from IDS.
3.7 RS232C serial communication
CLAVIS TYPE 7 - REV 7.010699
250 HZ
250 HZ
250 HZ
3124 N
0702 LBS
Each time a reading is taken the value is transmitted through the RS232 serial
port.The following protocol is employed; Baud Rate 9600, 8 data bits, 1 stop
bit.The value string is terminated by a ‘CR’, (Decimal 13). Output is through a 9
way ‘D’ type plug, (Pin 5 common, Pin 3 Transmit). Handshaking is not employed.
An example of the text output is shown below.
Charging
socket
Serial port
9 way 'D' type
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