Schmidt RTM-400 User manual

Edition Trum 01.5.E
Instruction Manual
Valid as of: 01.03.2012 • Please keep the manual for future reference!
S C H M I D T
c o n t r o l i n s t r u m e n t s
Trummeter
Model RTM-400

2
Contents
1 Warranty and Liability .............................................................................................. 3
1.1 Notices within the Operating Instructions............................................................... 3
1.2 Responsibilities of the Operating Company ........................................................... 3
1.3 Responsibilities of the Personnel ........................................................................... 3
1.4 Informal Safety Measures ...................................................................................... 4
1.5 Training of the Personnel ....................................................................................... 4
1.6 Intended Use.......................................................................................................... 4
1.7 Dangers in Handling the Device............................................................................. 4
1.8 Copyright................................................................................................................ 4
1.9 Declaration of Conformity, RoHs II, protection against optical radiation and
WEEE Registration ................................................................................................ 4
2 General Information.................................................................................................. 5
2.1 Specifications ......................................................................................................... 5
2.2 Delivery Includes.................................................................................................... 5
2.3 Unpacking .............................................................................................................. 5
3 Initial Setup and Operating Procedure ................................................................... 6
3.1 Notes Before Starting Measurement...................................................................... 6
3.2 Battery Insertion and Replacement........................................................................ 6
3.2.1 Switch-On......................................................................................................... 6
3.2.2 Switch-Off......................................................................................................... 6
3.3 Operating Elements ............................................................................................... 7
3.4 Menu Structure....................................................................................................... 8
3.5 Measuring the Strand Force................................................................................... 9
3.5.1 Measuring the Belt Frequency in Hertz ............................................................ 9
3.5.2 Calculating the Strand Force in N / Lbf........................................................... 10
3.5.3 Measurement Errors....................................................................................... 11
3.6 Calculation of the Strand Force Set Point in Newtons for V-Belts ....................... 11
4 Service and Maintenance....................................................................................... 12
5 Cleaning................................................................................................................... 12
6 Correspondence ..................................................................................................... 12
7 Repairs..................................................................................................................... 12

3
All persons who work with the device agree to perform the following duties before starting
work:
- to observe the basic regulations on industrial safety and accident prevention.
- to read the chapter on safety and the warning notices in these Operating Instructions and
to confirm with their signatures that they have understood them.
1 Warranty and Liability
In principle, the supply of the device is subject to our “General Conditions of Sale and
Delivery.” These have been provided to the operating company on conclusion of the
contract, at the latest.
Warranty:
- Trummeter belt tension meters are warranted for 12 months.
Parts subject to wear, electronic components and measuring springs are not covered by
the warranty. No warranty or liability will be accepted for bodily injury or property damage
resulting from one or several of the following causes:
- Misuse or abuse of the device.
- Improper mounting, commissioning, operation and maintenance of the device
(e.g. verification interval).
- Operation of the device if any safeguards are defective or if any safety and protection
precautions are not properly installed or not operative.
- Failure to comply with the notices in the Operating Instructions regarding transport,
storage, mounting, commissioning, operation, maintenance and setup of the device.
- Any unauthorized structural alteration of the device.
- Insufficient inspection of device components that are subject to wear.
- Opening the device or improper repair work.
- Disasters caused by the effects of foreign objects or by force majeure.
1.1 Notices within the Operating Instructions
The fundamental prerequisite for the safe handling of this device and its troublefree opera-
tion is the knowledge of the basic safety notices and safety instructions.
These Operating Instructions contain the most important notices for the safe operation of
the device.
These Operating Instructions, in particular the safety notices, must be observed by any
person who works with the device. In addition, the local valid rules and regulations for the
prevention of accidents must be complied with.
The representations within the Operating Instructions are not true to scale.
The dimensions given are not binding.
General indications of direction, such as FRONT, REAR, RIGHT, LEFT apply when view-
ing the front of the device.
1.2 Responsibilities of the Operating Company
In compliance with the EC Directive 89/655/EEC, the operating company agrees to only
permit persons to work with the device who:
- are familiar with the basic regulations on industrial safety and accident prevention and
who have been trained in handling the device.
- have read and understood the chapter on safety and the warning notices in these
Operating Instructions and have confirmed this with their signatures.
- are examined regularly on their safe and conscientious working method.
1.3 Responsibilities of the Personnel

4
The device was designed according to the state of the art and the approved safety stan-
dards. Nevertheless, its use may cause serious or fatal injury to the user or third persons,
and/or an impairment of the device or of other material assets.
The device may only be applied:
- For its intended use in a faultless condition with regard to the safety requirements.
- Malfunctions that could impair safety must be remedied immediately.
- Personal protective equipment must be used according to the EC Directive 89/686/EEC.
The Operating Instructions must always be kept on hand where the device is operated.
Apart from the Operating Instructions, the general and local valid regulations on accident
prevention and environmental protection must be provided and complied with.
1.4 Informal Safety Measures
1.6 Intended Use
1.7 Dangers in Handling the Device
The device is intended exclusively to be used as a belt tension meter. Any other use or
any use exceeding this intention will be regarded as misuse.
Under no circumstances shall HANS SCHMIDT & Co GmbH be held liable for damage
resulting from misuse.
The intended use also includes:
- Complying with all notices included in the Operating Instructions and observing all
inspection and maintenance works.
1.8 Copyright
The copyright on these Operating Instructions remains with the company
HANS SCHMIDT & Co GmbH.
These Operating Instructions are intended for the operating company and its personnel
only. They contain instructions and notices that may only be reproduced on the prior writ-
ten permission of
HANS SCHMIDT & Co GmbH
and under indication of the complete reference data.
Violations will be prosecuted.
1.5 Training of the Personnel
Only trained and instructed personnel is permitted to work with the device. The responsi-
bilities of the personnel must be clearly defined for mounting, commissioning, operation,
setup, maintenance, and repair. Trainees may only work with the device under the super-
vision of experienced personnel.
The device must not be operated in potentially explosive areas
and must not come into contact with aggressive substances.
1.9 Declaration of Conformity, RoHs II, protection against optical radiation and
WEEE Registration
In compliance with the EU Directives 2014/30/EU, 2011/65/EU and 2006/25/EC
HANS SCHMIDT & CO GmbH is registered in compliance with
the German Electrical and Electronic Equipment Act (ElektroG)
under WEEE Reg. No. DE 48092317.

5
2.1 Specifications
2.3 Unpacking
Unpack the instrument and inspect it for any shipping damage. Notices of defect must be
announced immediately, in writing, at the latest within 7 days on receipt of the goods.
Measuring Range 10 - 800 Hz
Display of readings up to 800 Hz
Input Range Free Strand Length Up to 9.99 m
Belt Mass Up to 9.999 kg/m
Digital Sampling Error < 1%
Indication Error ± 1 Hz
Total Error < 5%
Nominal Temperature +20° C
Operating Temperature +10° to +50° C
Transport Temperature -5° to +70° C
Display 2-line LCD, 16 char./line, with background lighting
Language Selection 10 languages
German - English - Italian - French - Spanish
Portuguese - Swedish - Norwegian - Danish - Finnish
Physical Units of Measure SI: m, kg/m, N
US: inch, lbs/foot, lbf, Hz
Power Supply 9 V E-block, e.g. long life 9 V lithium
Optional: Rechargeable 9 V battery and charger
Housing Plastic (ABS)
Dimensions, unit 80 x 126 x 37 mm
Dimensions, case 226 x 178 x 50 mm
Belt tension meter
1Measuring probe with cable
1Plug-in probe
1Operating Instructions
1Carrying case
1Battery
2.2 Delivery Includes
2 General Information

6
3.1 Notes Before Starting Measurement
Have you read and understood the Operating Instructions, in particular
Chapter 1 “Basic Safety Notices”? You are not permitted to operate the
device before doing so.
The instrument is supplied with the battery inserted.
If the DISPLAY shows “!!! LOW BAT !!!” the battery is low and must be replaced immedi-
ately. Operating the instrument with a low battery may cause measurement errors.
To insert the battery:
- Open the BATTERY COMPARTMENT
which is located on the rear side of
the instrument.
- Insert a 9 V battery (E-block) into the
BATTERY COMPARTMENT.
Please ensure proper polarity.
- Close the BATTERY COMPARTMENT.
3.2 Battery Insertion and Replacement
3.2.1 Switch-On
Press the on/off key.
The DISPLAY shows the software version, e.g. V 9.1.
3.2.2 Switch-Off
Auto power off:
- The instrument switches off automatically after approx. 3 minutes of non-use.
Manual switch-off:
- Press the on/off key for approx. five seconds.
Used batteries must be disposed of
in accordance with local regulations.
If the instrument will not be used for
a longer period of time, the battery
should be removed.
3 Initial Setup and Operating Procedure
Battery compartment Battery Cover
Attention!
The belt tension can be measured only when the drive has been
SHUT DOWN and is STATIONARY.

7
3.3 Operating Elements
BELT MASS
ARROW UP
STRAND LENGTH
ARROW DOWN
ENTER
ON / OFF
DISPLAY
Displays measured and calculated values in:
German, English, Italian, French, Spanish,
Portuguese, Swedish, Norwegian, Danish, Finnish
Measuring probe
Measures the natural
frequency of the taut,
free belt with the aid of
pulsed light

8
3.4 Menu Structure
Default settings:
Display: Hz
(no weight or length settings required)
Language: German
Unit of measure: International (SI)
“Display Hz/N”
display mode
“LOW-BAT” display
when battery voltage < 8 V
Set display mode
with ARROW UP/
DOWN keys
and confirm
with ENTER:
Hz / N / lbf
lbf if US set
“SI / US”
menu option
Set language with
ARROW UP/
DOWN keys
and confirm with
ENTER
Set international
or US units of
measure:
SI:
m, kg/m, N
US:
inch, lbs/foot, Ibf
and confirm with
ENTER
“Exit menu”
menu option
Display of
“software version”display „process busy“
when measurement successful
Set strand
length using
ARROW
UP/DOWN
keys
Set belt mass
using
ARROW
UP/DOWN
keys
Measurement
mode”
“Language selec-
tion” menu option
Off
On
Length
Kg/m
Enter
Enter
Enter
Enter
Enter
Enter
Down
Down
Down
Up
Up
Up
Enter

9
The belt tension can be measured only when the drive has been shut down and is sta-
tionary. The fitted and taut drive belt is tapped in order to make it oscillate with its natural
oscillation. This static natural frequency is then measured by the probe with the aid of
pulsed light. Care must be taken to ensure that the light is sufficiently reflected by the
belt. The measured values are displayed in hertz. Entering the belt mass and belt length
is not necessary.
- Tap the drive belt so that it begins to oscillate with its natural oscillation.
- Hold the measuring probe approximately at the center of the free strand length at a
distance of about 3 to 20 mm above the drive belt.
- Successful measurement is acknowledged by an acoustic signal and the indication
“Measurement” appears on the display.
- The measured value is displayed in Hz.
To measure the belt tension:
- Switch on the instrument.
- Set the instrument parameters as described in Chapter 3.4 Menu Structure on page 8.
Attention!
The belt tension can be measured only when the drive has been
SHUT DOWN and is STATIONARY.
Preferably, the belt
tension should
always be mea-
sured at the center
of the longer belt
strand between the
two drive pulleys. The distance between the drive
belt and the measuring probe
should be between 3 and 20 mm.
Drive belts expand after mounting. Therefore the belt should be mounted 30%
above the calculated strand force value. Check again after one hour.
Measurement deviations of up to +/- 10% for several measurements taken on the
same drive belt are as a rule not caused by a measurement error or fault in the
unit. In most cases, measurement deviations are due to the mechanical toler-
ances of the drive systems.
Recommendation: Repeat the measuring 3 - 5 times and use the average as
measuring value.
3.5 Measuring the Strand Force
3.5.1 Measuring the Belt Frequency in Hertz

10
To measure the belt mass precisely, we recommend that you weigh the drive belt
and then recalculate this weight based on a belt length of 1 meter.
Ribbed V-belts PJ = 0.082 PL = 0.320
PM = 1.100 kg/m per 10 ribs
V-belts SPZ = 0.074 SPA = 0.123
SPB = 0.195 SPC = 0.377 kg/m per belt
10 = 0.064 13 = 0.109
17 = 0.196 20 = 0.266
22 = 0.324 25 = 0.420
32 = 0.668 40 = 0.958 kg/m per belt
Power belts SPZ = 0.120 SPA = 0.166
SPB = 0.261 SPC = 0.555 kg/m per rib
3V/9J = 0.120 5V/15J = 0.252
8V/25J = 0.693 kg/m per rib
Polyurethane T 2.5 = 0.015 T 5 = 0.024
toothed belts T 10 = 0.048 T 20 = 0.084 kg/m per 10 mm width
AT 3 = 0.23 AT 5 = 0.034
AT 10 = 0.063 AT 20 = 0.106 kg/m per 10 mm width
Measurement deviations of up to +/- 10% for several measurements taken on
the same drive belt are as a rule not caused by a measurement error or fault
in the unit. In most cases, measurement deviations are due to the mechanical
tolerances of the drive systems.
Recommendation: Repeat the measuring 3 - 5 times and use the average as
measuring value.
Attention!
Newton or pound-force calculations have a
SQUARE factor higher error result!
The following table lists some examples of standard belt sizes:
3.5.2 Calculating the Strand Force in N / Lbf
To calculate the strand force, enter the belt mass and belt length with the membrane
keypad as described in Chapter 3.4. The strand force calculated is compared with the
set point value defined when the drive was designed.
The belt tension meter calculates the strand force using the formula:
F = 4 xm xL2xf2Where:
F = strand force in N
m = linear belt mass in kg/m
L = length of the free belt strand in m
f = natural frequency of the free belt measured in Hz

11
If no measurement results are displayed despite careful preparations, this may be due to
one of the following two reasons:
1.The drive belt oscillates below the minimum measurement limit of 10 Hz.
Remedy
Tighten the belt or, if the strand length is very long and open, support the belt in order
to shorten the strand length. Enter the new belt length before repeating measurement.
2.Either no or low measurement values are displayed despite the drive belt being
correctly tensioned.
Remedy
It may be the case that the light from the measuring probe is not sufficiently reflected.
To improve reflection, affix a piece of light-colored adhesive tape to the belt or slightly
moisten the belt at the measuring point.
3.5.3 Measurement Errors
In case you have no data from the machine producer about the set point of the strand
force, you can calculate the approximate strand force with the following formula.
Where:
P = motor power (kW)
z = number of belts
v = belt speed = D x n/19100
D = effective diameter of the small wheel (mm)
n = speed of the small wheel (rpm)
m x v2= centrifugal force (relevant for speed > 800 rpm)
m = weight of one belt (kg/m), as specified in the table
Besides the best strand force “F” consider the permissible axial load
of the bearings: AXIAL LOAD FA= 2 x strand force
3.6 Calculation of the Strand Force Set Point in Newtons for V-Belts
540 x P x 1,3
z xv
F = + m x v2

4 Service and Maintenance
The instrument is easy to maintain. De-
pending on operating time and load, the
instrument should be checked according to
the locally valid regulations and conditions.
5 Cleaning
For cleaning the unit, do not use any
AGGRESSIVE
SOLVENTS
such as trichloroethylene or similar
chemicals.
NO WARRANTY OR LIABILITY
shall be accepted for damage resulting
from improper repair work.
Should you have any questions regarding
the instrument or Operating Instructions,
or their use, please indicate above all the
following details which are given on the ID
plate:
1) Model
2) Serial number
6 Correspondence
7 Repairs
HANS SCHMIDT & Co GmbH
Schichtstr. 16
D-84478 Waldkraiburg
Germany
Service address:
Shipping instructions:
We kindly ask for return free of charge
for us, if possible by airmail parcel. All
occurring charges, if any (such as freight,
customs clearance, duty etc.), will be billed
to customer.
For return from foreign countries, we ask
you to include a proforma invoice with a
low value for customs clearance only, e.g.
50 Euro, each and to advise the shipment
in advance by fax or eMail.
To avoid unnecessary follow-up questions,
and the resulting loss of time or possible
misunderstandings, please return the
instrument with a detailed fault description
to our service department.
Mailing address:
P. O. B. 1154
84464 Waldkraiburg Germany
Shipping address:
Schichtstr. 16
84478 Waldkraiburg Germany
Hans Schmidt & Co GmbH
Phone:
int. + 49 / (0)8638 / 9410-0
Fax:
int. + 49 / (0)8638 / 4825
int. + 49 / (0)8638 / 67898
More than 70 years - Worldwide -
e-mail:
[email protected]
Internet:
http://www.hans-schmidt.com
S C H M I D T
c o n t r o l i n s t r u m e n t s