Habasit BTM-1 User manual

Operating instructions – Belt tension meter BTM-1
Version 1.0
2
This disclaimer is made by and on behalf of Habasit and its affiliated companies, directors, employees,
agents and contractors (hereinafter collectively "HABASIT") with respect to the products referred to herein
(the "Products").
SAFETY WARNINGS SHOULD BE READ CAREFULLY AND ANY RECOMMENDED SAFETY PRECAUTIONS BE
FOLLOWED STRICTLY! Please refer to the Safety Warnings herein, in the Habasit catalogue as well as
installation and operating manuals.
All indications / information as to the application, use and performance of the Products are
recommendations provided with due diligence and care, but no representations or warranties of any kind
are made as to their completeness, accuracy or suitability for a particular purpose. The data provided
herein are based on laboratory application with small-scale test equipment, running at standard conditions,
and do not necessarily match product performance in industrial use. New knowledge and experience may
lead to re-assessments and modifications within a short period of time and without prior notice.
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PROCESS ABILITY OF THE PRODUCTS, INCLUDING INDICATIONS ON PROCESS RESULTS AND OUTPUT.

Operating instructions – Belt tension meter BTM-1
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Contents
Introduction................................................................................................... 4
Safety guidelines................................................................................ 4
Notes on batteries/rechargeable batteries......................................... 5
Care Instructions................................................................................ 6
Maintenance....................................................................................... 6
Disclaimer .......................................................................................... 6
Intended use ...................................................................................... 7
Delivered items .................................................................................. 7
Product advantages........................................................................... 7
Preparation measures.................................................................................. 8
Connecting the measurement probe.................................................. 8
Operational elements................................................................................... 8
Operating buttons .............................................................................. 8
Checking Calibration.................................................................................... 9
Operation.................................................................................................... 10
General information on "belt tension“ .............................................. 10
Measuring procedure....................................................................... 11
Positioning of the measurement probe............................................ 12
Belt Selection................................................................................... 13
How to get belt weight information?................................... 13
Step by Step: .............................................................................. 14
Procedure: .................................................................................. 14
Input of calculated value in the BTM-1............................... 14
Measurement Procedure ................................................................. 15
Storing measurements..................................................................... 16
Calling up stored measurements..................................................... 16
Procedure: .................................................................................. 16
Switching off the instrument........................................................ 16
Specifications ............................................................................................. 17
Menu structure ........................................................................................... 18
Problem solving.......................................................................................... 19

Operating instructions – Belt tension meter BTM-1
Version 1.0
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Introduction
Thank you for choosing your new Habasit measurement system - the Belt
Tension Meter. We hope to be able to fulfill your expectations of this modern
measurement system. Before making any measurements, be sure to read
and follow the safety guidelines and precautionary measures.
We wish you great success in using your new measurement system.
Safety guidelines
The Belt Tension Meter uses an extra bright, red LED (660 nm).
For this reason, it is not necessary to take measures to protect
your eyes. However, do not look directly into the bright
measurement beam at close range.
Consider the following safety precautions.
Caution
Before making measurements, ensure that the instrument is
switched off (master switch) and secured against unintentional
restarting.
• Personnel must be informed in a timely manner that
measurements will be performed.
• If necessary, clearly mark and cordon off the service area at or
around the machine, for example, by using lines or ropes.
• The measuring and setting of the belt tension must only be
performed by qualified, instructed technical staff while following
the specific instruction manual for the instrument
as well as the
extended documentation from the supplier.
Caution
This instrument must not be operated in rooms with high humidity.
Avoid direct exposure to heat, for example, through sunlight.
Moisture and rain, as well as extreme heat or cold, will
damage the instrument.
Note
Do not let the instrument drop or be bumped sharply. The delicate
optics could be damaged and the measurements made unusable.

Operating instructions – Belt tension meter BTM-1
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Caution
For connecting the Belt Tension Meter to a PC, only use the
special BG 810000 cable. If a normal RS232 cable is used, the
instrument can be damaged.
Notes on batteries/rechargeable batteries
If the instrument is not to be used for a long period of time, then the battery
/rechargeable battery must be removed. Otherwise, there is a risk of
discharging or ruining the battery/rechargeable battery, and consequently
damaging the instrument.
Caution
Regular batteries must not be recharged, heated, or disposed of
in an open flame (explosion hazard!).
Note
Please contribute to the protection of the environment.
Discharged batteries and rechargeable batteries should not be
disposed of along with household waste. They can be taken to
collection sites for used batteries or special waste.
Find out where these sites are located.
At the end of its service life, this product must not
be disposed of along with normal waste but must
be taken to a collection site for the recycling of
electrical and electronic devices.
The materials can be reused according to how they
are labelled. By recycling, reusing the materials or
other forms of reusing old equipment, you will
make an important contribution to the protection of
our environment.

Operating instructions – Belt tension meter BTM-1
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Care Instructions
The Belt Tension Meter has been developed for industrial use and is
protected against sprayed water and dust in accordance with IP10; the
measurement probe is protected in accordance with IP66. For cleaning the
housing, a soft cloth, with mild soapy water if necessary, should be used; the
detector surface should only be cleaned with alcohol.
When cleaning the detector surface of the measurement probe, do not use
paper towels or materials that could scratch the detector surface. For optimal
operational conditions, the detector surface as well as the connections
should be protected from becoming soiled or, for example, from coming into
contact with oil or grease.
Maintenance
In case of any malfunction, contact Habasit. Do not open the instrument
yourself. The warranty will expire if unauthorized persons attempt to repair
or otherwise tamper with the instrument.
Storage must always take place under dry conditions. Transport the
instrument only in its original case.
Note
The manufacturer assumes no responsibility for damages that
arise as result of improper maintenance or repair work by third
parties.
Disclaimer
Habasit is not liable for damages that arise as a result of improper use.
Knowledge of this handbook is also part of proper use. For this reason,
strictly follow the instructions in this handbook and in the technical
documents for the sensors. We cannot be liable for errors that arise due to
not following the operating instructions.

Operating instructions – Belt tension meter BTM-1
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Intended use
The Belt Tension Meter is a precision measuring instrument for measuring
the belt tension of flat belts and timing belts on power transmission
applications. Furthermore it allows measuring the rotary speed of industrial
machines and units by using a reflecting point
Note
The Belt Tension must only be used for the purposes specified
above. Unintended usage, use of unsuitable components, or
modifications in regard to intended use can lead to malfunctions
in operation for which Habasit assumes no liability.
Delivered items
This Belt Tension Meter measurement instrument is delivered in a durable
plastic case. A measurement probe and a 9 V battery are also supplied.
Product advantages
• Precise measurement of belt tension
• Precise measurement of rotary speed
• Precise calculation of belt span tension
• Built-in frequency test for checking the measurement probe
• Required for recording in accordance with DIN EN ISO 9001ff
• Operational guidance and readout of measured values in a choice of 4
languages
• Simple and reliable operation
• Compact and handy design, rubber-coated for protection

Operating instructions – Belt tension meter BTM-1
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Preparation measures
Connecting the measurement probe
Remove the measurement probe from its case. Insert the measurement
probe connector into the socket on the Belt Tension Meter. Secure the
connector by tightening both screws.
Caution
Do not over tighten the two screws.
Operational elements
The operating buttons control various functions. The display shows settings
and measurement results. The measurement probe registers the
characteristic frequency of the tensioned, free belt by using pulsed light or
the rotary speed, and communicates the measurement values to the Belt
Tension Meter.
Operating buttons
- Input belt weight [kg/m
2
] (1st
click)
- Access belt database (2
nd
click)
- Input strand length
- Input belt width
- Enter
- Skip menu (>1s)
- Scroll-up
- Increase setting
- Scroll-down
- Decrease setting
- On-Off
- Save measurement
Display
Probe

Operating instructions – Belt tension meter BTM-1
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Checking calibration
Please follow the instructions below. This ensures that the device works
properly and avoids incorrect measurement results.
The Frequency test is an important and useful additional function for
checking the measurement probe.
During this "self-test", the Belt Tension Meter display generates a nominal
frequency of 25 Hz using the display backlight. That is, the illumination of the
display is switched off and on at a frequency of 25 Hz. If it is functioning
properly, the measurement probe must readout this 25 Hz in the display. The
readout can vary in the range from 24.7 Hz to 25.3 Hz.
1. Switch on the Belt Tension Meter using the button.
2. Switch to the "Freq-Test" using ; see "Menu structure", p. 18.
3. Activate the frequency test using ; the display begins to "flicker" at a
nominal frequency of 25 Hz.
4. Hold the measurement probe up close to the display.
5. The measurement probe measures the display frequency; the result is
indicated in the display and an acoustic signal is generated if the
measurement is successful.
6. Switch off the frequency test by using ; switch back to the
measurement mode using .
Note
If the result deviates from the nominal value of 25 Hz (readout
in display: 24.7 – 25.3 Hz), then check the cables as well as
the battery voltage.
If in doubt, contact Habasit Technical Support.

Operating instructions – Belt tension meter BTM-1
Version 1.0
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Operation
Operating the Belt Tension Meter is simple and straight forward.
General information on "belt tension“
Measuring the belt span tension
The strand or span is the part of a
belt which is between two pulleys.
The length is identical with the
shaft distance.
To calculate the belt tension or trum force, the measured values of the
- belt mass
- belt length
- belt width
are required.
The trum force is calculated using the following formula:
𝐅= 𝟒⋅𝐦
𝐑
“⋅𝐛𝐨
𝟏𝟎𝟎𝟎 ⋅𝑳
𝟐
⋅𝒇
𝟐
F
belt force (trum force)
[N]
mR“
belt mass per square meter
[kg/m2]
bo
belt width
[mm]
L
free oscillating belt length
[m]
f
measured characteristic
frequency of the free belt
[Hz]

Operating instructions – Belt tension meter BTM-1
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Measuring procedure
The belt tension can only be measured when the drive is switched off and
stopped.
Caution
Before making measurements, ensure that the machine is
switched off
(master switch) and secured against unintentional restarting.
The installed and tensioned drive belt is set into natural oscillation with a
short impulse or by striking it lightly.
This static characteristic frequency is measured by the probe by using light
pulses. There must be a sufficient amount of light reflected from the belt. If
the intensity is low because of a dark belt color it helps to mark to belt locally
with a bright color (e.g. correcting fluid or small piece of adhesive tape, etc.).
By using the measured frequency along with the mass of the belt (from the
integrated belt database, for example) the width and the length of the free
belt strand the Belt Tension Meter calculates the trum force.
The readout of the measured values will be indicated according to the
settings; for example, frequency in Hertz or force in Newton’s.

Operating instructions – Belt tension meter BTM-1
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Positioning of the measurement probe
The distance between the drive belt and the measurement probe should be
between 3 - 20 mm. The measurement of the belt tension should take place
at the longer strand of the belt, in the middle between the two drive rollers.

Operating instructions – Belt tension meter BTM-1
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Belt Selection
The belt tension meter provides a data base with most of the Habasit flat-
and timing belts. You can select by pressing 2x the button.
If the required belt type is not available you can create a user defined type.
Thus you need to know the weight per square meter [kg/m2].
How to get belt weight information?
Flat belts (data sheet available):
For flat belts you can find the required value (grammage) in the data sheet.
Timing belts (data sheet available):
For timing belt you will only find a weight per meter [kg/m] of belt length
associated with a specific belt width.
Example for AT10-S-01:
Here you have to calculate the required weight in [kg/m2] by selecting the
weight per meter of the widest belt, dividing this value by the width and then
multiplying by 1000.

Operating instructions – Belt tension meter BTM-1
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Step by Step:
−Selection of the weight for a 25mm wide belt

m = 0.15[kg/m]
−Dividing the weight by the nominal belt width of 25mm
ρ
= m[kg/m] / b[mm] = 0.15 / 25 = 0.006[kg/(m*mm)]
−Convert from [g/m2] to [kg/m2] by multiplication with 1000

0.006[kg/(m*mm)] * 1000[mm/m] = 6.0[kg/m2]
No datasheet values available (flat or timing belts)
If no datasheet is available it is possible to measure the weight and then to
calculate the grammage. A precondition for this is to have an accurate scale
available, which can measure with an accuracy of
+/-1% of the measured value.
Procedure:
The weight of a piece of belt with a width “b” and a length “l” has to be
measured with a scale. The weight [kg] has to be divided by the width [m]
and by the length [m].
Example for AT10-S-01:
•You have a piece of 15mm width and 0.5m length.
•The weight is 45g = 0.045kg
•The weight has to be divided by the dimensions in meter [m].
ρ= m [kg] / b [m] / l [m] = 0.04 / 0.015 / 0.5 = 6.0 [kg/m2]
Input of calculated value in the BTM-1
1. Switch on the device 
2. Open belt selection menu by 2x pushing the button.
3. Select belt type zero “0”.
4. Enter the calculated value.

Operating instructions – Belt tension meter BTM-1
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Measurement Procedure
Switch on the Belt Tension Meter pushing . The instrument is ready for
taking measurements.
1. Input the belt strand length and width see "Menu structure" p. 18.
2. Select the belt type choose belt nr. 0 for individual type or select a belt
type from the implemented belt database. In case of using individual
types it is required to input the belt weight per square meter.
3. Set the drive belt into natural oscillation by striking it.
4. Hold the measurement probe over the drive belt at approximately the
center of the free belt span length.
The distance from the belt can be between 3 and 20 mm.
5. The result is displayed in Newton or Hertz. A successful measurement is
acknowledged by a longer acoustic signal.
6. Check the setup and repeat the measurement.
General installation instructions for belt drives
As a consequence of thermoplastic materials belts relax after a
certain time of installation. Therefore it is recommended to check
and adjust the tension after a few hours of operation. Along with
the recommended tension by the belt supplier the admissible
radial forces of the bearings have to be considered as well 
Radial force = 2x trum force.
Interpretation of measurement deviations
Measurement deviations of about +/-10 % within repeated
measurement of the same application don’t necessarily indicate a
problem of the device. In most cases this is attributed to
mechanical tolerances of the belt drive and variation in excitation
of the belt vibration.
Therefore it is recommended to make several measurements and
take the average.

Operating instructions – Belt tension meter BTM-1
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Storing measurements
For documentation purposes, you may store the measurements that have
been made in the instrument. The instrument has internal storage for up to
255 measurements. Using the optional Belt Tension Meter PC-Software,
convenient options are available for producing measurement data reports.
Procedure:
1. Measurement performed, measured value is displayed.
2. Press button “Storage No.” appears in the display.
3. Using arrow buttons to select storage No.
4. Confirm with “Store?”appears in the display.
5. Confirm with for OK or cancel using for Esc.
6. After storing, the Storage No. appears in the display.
Calling up stored measurements
You may call up measurements stored in the instrument at any time.
Procedure:
1. Press Storage No. X appears in the display.
2. Using arrow buttons to select Storage No.
3. Press the measurement result appears in the display.
4. If necessary, select an additional Storage No. using .
5. To end, press button twice.
Switching off the instrument
Press and hold down until “Off” appears in the display.

Operating instructions – Belt tension meter BTM-1
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Specifications
Model: BTM-1
Measurement range 1 - 500 Hz
Modulation 5 kHz
Sensor test 25 Hz incl.
“OK” message
Readout error +/- 0.3 Hz
Resolution +/- 0.1 Hz
Operation -20°...+85°C
(-68°...+185° F)
Storage -40°...+105°C
(-40°...+221°F)
Humidity 20 .. 95 %
Housing plastic (PVC) IP10
Measurement sensor plastic; IP66
Housing dimensions WxHxD 75 x 115 x 35 mm (2.95 x 4.53 x 1.38 in)
Carrying-case dimensions 230 x 220 x 75 mm (9.06 x 8.66 x 2.95 in)
Display 2 line LCD 12 x 60 mm (0.47 x 2.36 in)
with background illumination
Languages language selection for four languages
Input limits free belt strand 30 – 9’999 mm
Input limits belt mass 0.001 - 9.999 kg/m
Input limits belt width 1 – 999mm
Number of storage locations 255
Voltage supply 9 V alkaline battery, type E-Block 6LR61
Interface RS232, DSUB9

Operating instructions – Belt tension meter BTM-1
Version 1.0
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Menu structure
At the lower left in the display of the Belt Tension Meter, each active function
key appears superimposed on the corresponding menu item.

Operating instructions – Belt tension meter BTM-1
Version 1.0
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Problem solving
Although everything was prepared properly, no measurement is performed.
Potential Cause
Proposal for Adjustment
1
The belt frequency is
to low
Increase tension, choose shorter trum or
reduce trum length by fixing the belt on one
side to a fix part of the machine. Change trum
length in the settings accordingly.
2
“Low-Bat” is displayed
Battery needs to be changed.
3
Device is in power-off
mode.
Power-save function switches-off after 10
Minutes of inactivity.
4
Light beam of probe is
not reflected
sufficiently
To improve reflection properties apply a piece
of bright adhesive tape on the area of
measurement.
5
Distance of
measurement is not
within recommended
tolerance
Please make sure that the distance between
belt and probe is between 5 – 20mm
Displayed test result is not reasonable.
Potential Cause
Proposal for Adjustment
1
Light beam of probe is
not reflected
sufficiently
To improve reflection properties apply a piece
of bright adhesive tape on the area of
measurement.
2
Distance of
measurement is not
within recommended
tolerance
Please make sure that the distance between
belt and probe is between 5 – 20mm

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Phone: [phone]
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Ltd.
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Customer Care:
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For int. calls: +39 0438
911 444
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Subject to alterations
Printed in Switzerland
Publication data:
4395INS.TOL-en0216HQR