Checkline MST User Manual

Operating฀Instructions

Valid as of:฀01.02.2006฀•฀Please keep the manual for future reference!

CHECK•LINE

®

BY ELECTROMATIC

ELECTROMATIC

E Q U I P M E N T C O., I N C.

600 Oakland Ave., Cedarhurst, NY 11516–U.S.A.
TEL: [phone] • FAX: [phone]

CHECK•LINE

®

INSTRUMENTS

Contents

1 Warranty and Liability ...........................................................................................4

1.1 Notices within the Operating Instructions .........................................................4

1.2 Responsibilities of the Operating Company ......................................................4

1.3 Responsibilities of the Personnel .....................................................................4

1.4 Informal Safety Measures ................................................................................5

1.5 Training of the Personnel .................................................................................5

1.6 Intended Use ....................................................................................................5

1.7 Dangers in Handling the Device .......................................................................5

1.8 Copyright ..........................................................................................................5

1.9 EU - Declaration of Conformity .........................................................................5

2.1 Specifications ........................................................................................................6

2.2 Pin Assignment and Signals of the RS-232 Interface

(9-Pin D-Sub Connector) ..................................................................................6

2.3 Optional Accessories ........................................................................................7

2.3.1 Pin Assignment of the Analog Cable (Option ET2-CA) .........................7

2.4 Delivery Includes ..............................................................................................7

2.5 Unpacking ........................................................................................................7

3 Notices before Starting Measurement .................................................................7

3.1 Operating Elements ..........................................................................................8

3.2 Battery Insertion ...............................................................................................9

3.2.1 Switch-On ...............................................................................................9

3.2.2 Switch-Off ...............................................................................................9

3.2.3 Zero Adjustment of the Measuring Position (Auto Zero) ......................... 9

3.3 Operating Procedure ........................................................................................10

3.3.1 Measuring the Upper Tension .................................................................10

3.3.2 Measuring the Lower Tension .................................................................11

3.3.3 Switching on Damping Mode ..................................................................12

3.3.4 Changing the Damping Factor ................................................................12

3.4 Storing the Tension Values ..............................................................................13

3.4.1 Recalling the Stored Tension Values ....................................................... 13

3.4.2 Clearing the MST Memory ......................................................................14

3.4.3 Memory Function HOLD .........................................................................14

3.5 Error Messages ................................................................................................15

3.6 Verification of Measuring Accuracy ..................................................................16

3.7 Calibration of the MST ......................................................................................16

3.7.1 Error Messages During Calibration ......................................................... 19

3.7.2 Restoring the Factory Calibration ...........................................................19

4 PC Communication (RS-232-C Interface) ............................................................20

4.1 WINDOWS Terminal Program ..........................................................................20

4.2 TENSION INSPECT ET2-P1 ............................................................................20

5 Service and Maintenance ...................................................................................... 21

6 Cleaning .................................................................................................................21

7 Verification of Calibration and Determination of Repair Costs ......................... 22

8 Correspondence ....................................................................................................23

9 Repairs ...................................................................................................................23

2

3

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:

- SCHMIDT 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 opera­tion 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 locally 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 view­ing 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

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.

4

1.4 Informal Safety Measures

The Operating Instructions must always be kept on hand where the device is operated.
Apart from the Operating Instructions, the generally and locally valid regulations on acci­dent prevention and environmental protection must be provided and complied with.

1.5 Training of the Personnel

Only trained and instructed personnel is permitted to work with the device. The responsi­bilities of the personnel must be clearly defined for mounting, commissioning, operation,
setup, maintenance and repair. Trainees may only work with the device under the supervi­sion of an experienced personnel

1.6 Intended Use

The device is intended exclusively to be used as a 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.

1.7 Dangers in Handling the Device

The device was designed according to the state of the art and the approved safety stan­dards. 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 90 / 686 / EEC.

The device must not be operated in potentially explosive areas and must
not come into contact with aggressive substances.

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
written permission of
HANS SCHMIDT & Co GmbH
and under indication of the complete reference data. Violations will be prosecuted.

1.9 EU - Declaration of Conformity

In compliance with the EC Directive 89 / 336 / EEC (93 / 68 /EEC)

5

2.1 Specifications Calibration: Acc. to SCHMIDT factory procedure with 0.2 mm Ø PA monofil

Tension Range: 1 - 500 cN
Accuracy: ± 1% FS* ± 1 digit (typically ± 0.5% FS*)
Overrange: 10% FS*, without accuracy guarantee
Overload Protection: 200% FS*
Measuring Principle: Strain gauge bridge
Meas. Roller Deflection: max. 0.5 mm
Signal Processing: Digital, 12 bit A/D converter
Damping: Adjustable electronically (averaging)
Meas. Frequency: Approx. 5 kHz internally
Display Update Rate: 2x per sec.
Display: 3-digit LCD, 11 mm high
Memory: Average, last value, maximum, minimum, MAX
Temperature Coefficient: Gain: less than ± 0.01% FS*/°C
Output Signal Analog: 0 - 2 V DC (linearized), R

Converter frequency 30 Hz

> 1 kW ± approx. 1%

load

PEAK

, MIN

Digital: RS-232 (9600, 8, N, 1)
Temperature Range: 10 - 45° C
Air Humidity: 85% RH, max.
Auto Power Off: Automatically after approx. 3 min. of non-use
Power Supply: 9 V E block, e.g. long life 9 V lithium

AC adapter 12 V, 500 mA

Housing Material: Aluminium profile with plastic outer casing (PVC)
Housing Dimensions
(incl. clamping device): 215 mm x 100 (140) mm x 120 mm (W x D x H)
Weight, tension meter: 1 kg
Weight, suction cup: 0.5 kg

*FS = Full Scale

Guide Rollers:

PEAK

V-grooved

Line Speed

m/min max.

Standard 2000

Roller

Material

Hardcoated

aluminium

2.2 Pin Assignment and Signals of the RS-232 Interface (9-Pin D-Sub Connector)

5 4 3 2 1

Pin

Number

Signal Description

1 Not assigned
2 TXD TRANSMITTED DATA
3 RXD RECEIVED DATA
4 Not assigned

9 8 7 6

Signal RS-232-C

Data Bit 8 bits
Stop Bit 1 bit

Parity None

Baud Rate 9600

5 GND Ground
6 Not assigned
7 RTS READY TO SEND
8 Not assigned
9 2 V DC Analog signal

6

2.3 Optional Accessories ET2-CA: Connecting cable for analog signal ET2-CC: Digital connecting cable ET2-P1: “TENSION INSPECT”

Software (Win 95 or higher) for viewing and storing the measured data
on a PC.

2.3.1 Pin Assignment of the Analog Cable (Option ET2-CA)

9-pin male D-sub connector

Pin 9 = analog signal

Pin 5 = Ground (GND)

2.4 Delivery Includes

Tension meter with 9 V long life battery
1 AC adapter 12 V, 500 mA
1 Pair of scissors
1 Screw driver (1.5 mm blade width)
1 Operating Instructions
1 Stand

2.5 Unpacking

Unpack the tension meter and inspect it for any shipping damage. Notices of defect must
be filed immediately, at the latest within 10 days on receipt of the goods.

3 Notices 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
instrument before doing so.

Before working with the instrument you must put on your personal protective
clothing, if necessary. For example, eye protectors, gloves, etc.
To avoid damage, do not move the center roller by hand.

Tensions that exceed the tension range of the instrument by more than 100%
may cause permanent damage to the measuring spring and must be avoided
under any circumstances.

The ID plate with the CE mark and the serial number as well as the calibration
label (optional) and the SCHMIDT Quality Seal are provided at the bottom of
the instrument.

7

3.1 Operating Elements

10

9

11

13 Pos. 1

8

14

14

12

1

2 3 4 5 6

14

13 Pos. 2

14

7

1 ROLLERS
2 DISPLAY
3 DAMP key
4 MEM key
5 RECALL / HOLD key
6 POWER / ZERO key
7 Interface

8

fig. 3.1b

8 Battery compartment
9 AC adapter connector
10 TAKE OFF ROLLER
11 ON / OFF button
12 Clamping device for suction cup
13 FIXTURE TO DETERMINE BOBIN CASE
14 CERAMIC EYES

–+

6

CN

–+

3.2 Battery Insertion

i

0 0 0 0

88 88. . .

Peak Mem Damp gcN

Peak Mem Damp gcN

– +

Before first use of your tension meter, you need to insert the battery. If the

symbol is

shown on the DISPLAY
Operating the tension meter 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.

Used batteries must be disposed of in compliance with local regulations.
If the instrument will not be used for a longer period of time, the battery should be
removed.

3.2.1 Switch-On

Press the POWER key until all symbols are shown on the DISPLAY

When you release the key, the DISPLAY momentarily shows the tension range and the
software version, e.g. E 1.0, followed by random values or “0”.

3.2.2 Switch-Off Auto power off:

The tension meter switches off automatically after approx. 3 minutes of non-use.

Manual switch-off:

- Press the POWER key for five seconds.

3.2.3 Zero Adjustment of the Measuring Position (Auto Zero)

The instrument is factory calibrated for a vertical material path. Therefore, before starting
measurement you need to carry out zero adjustment, as described below, each time the
tension meter is switched on. This procedure is necessary to compensate for the weight
of the measuring roller in the measuring position. The zero adjustment for the new mea­suring path only remains effective until the instrument is switched off.

the battery is low and must be replaced immediately.

.

Zero adjustment must be repeated whenever the material path is changed or
the tension meter does not display “0”. The process material must not yet be
inserted!

Requirement:

- Tension meter switched on as described in Chapter 3.2.1.

To carry out zero adjustment:

- Place the MST in the desired measuring position.

- Press the POWER key 6.

The DISPLAY 2 momentarily shows
The MST is now adjusted for the new material path and is ready to measure.

and then switches to .

9

3.3 Operating Procedure

3.3.1 Measuring the Upper Tension Requirements:

- Tension meter switched on as described in Chapter 3.2.1.

- Damping factor set, if necessary (Ch. 3.3.4)

- Zero adjustment carried out as described in Chapter 3.2.3.

To insert the process material:

- At the sewing machine, thread the upper thread all the way through to the take-up lever

- Thread the upper thread through the first CERAMIC EYE,

- and then through the MEASURING ROLLERS (see material path symbol on front side)
It is important to assure that the UPPER THREAD runs smoothly between the
MEASURING ROLLERS.

- Thread the upper thread through the second CERAMIC EYE,

- and clamp it in the rubber groove of the motor-driven TAKE OFF ROLLER.

MEASURING ROLLERS

2ND CERAMIC EYE

TAKE OFF ROLLER

To measure the process material:

- Press the ON / OFF button to switch on the motor-driven TAKE OFF ROLLER.
The tension meter starts measuring.

- The DISPLAY shows the measured tension values.
You can simultaneously set the desired upper tension at the corresponding setscrew of
the sewing machine.
If any error messages occur during measurement, please refer to Chapter 3.5 for details.

To remove the process material:

- Press the ON / OFF button to switch off the motor-driven TAKE OFF ROLLER.

- Remove the UPPER THREAD from the MEASURING ROLLERS and cut it off at the
TAKE OFF ROLLER with the supplied scissors.

1ST CERAMIC EYE

UPPER THREAD

10

3.3.2 Measuring the Lower Tension Requirements:

- FIXTURE TO DETERMINE BOBIN CASE removed from POSITION 1 and screwed in
at POSITION 2.

- Tension meter switched on as described in Chapter 3.2.1.

- Damping factor set, if necessary (Ch. 3.3.4)

- Zero adjustment carried out as described in Chapter 3.2.3.

To insert the process material:

- Slip the BOBBIN CASE with the full lower-thread bobbin onto the FIXTURE TO
DETERMINE BOBIN CASE- Properly insert the LOWER THREAD from the bobbin into
the BOBBIN CASE.

- Thread the lower thread through the first ceramic eye,

- and then through the MEASURING ROLLERS (see material path symbol on front side).
It is important to assure that the LOWER THREAD runs smoothly between the
MEASURING ROLLERS.

- Thread the lower thread through the second CERAMIC EYE,

- and clamp it in the rubber groove of the TAKE OFF ROLLER.

MEASURING ROLLERS
DELIVERY
ROLLER

2nd CERAMIC EYE

1st CERAMIC EYE

BOBBIN CASE

FIX-

POSITION 2

POSITION 1

To measure the process material:

- Press the ON / OFF button to switch on the motor-driven TAKE OFF ROLLER.
The tension meter starts measuring.

- The DISPLAY shows the measured tension values.
You can simultaneously set the desired lower tension at the corresponding setscrew of
the BOBBIN CASE.
If any error messages occur during measurement, please refer to Chapter 3.5 for details.

To remove the process material:

- Press the ON / OFF button to switch off the motor-driven TAKE OFF ROLLER.

- Remove the LOWER THREAD from the MEASURING ROLLERS and cut it off at the
TAKE OFF ROLLER with the supplied scissors.

LOWER THREAD

11

3.3.3 Switching on Damping Mode

2 21.

DampcN

12

c N

i

The MST is equipped with an electronic damping which ensures steady readings when
tension fluctuates. This is achieved by averaging the measured values at the set update
rate. Before switching on the damping mode, it is recommended that you measure the
first values without damping enabled.

Requirements:

- Process material inserted as described in Chapter 3.3.

- The DISPLAY has shown the first tension values.

To switch on damping:

- Press the DAMP key.
The display shows the set damping factor.

- Release the DAMP key.

The DISPLAY shows

To switch off damping:

- Press the DAMP key 3.

The DISPLAY shows

3.3.4 Changing the Damping Factor

The tension meter is factory preset to a damping factor of 07. The tension values are
thereby averaged for the display in the following way:

7 old values + 9 new values
16
The damping factor can be modified in 15 steps from 01 = low damping:

1 old value +15 new values
16
to 15 = high damping

15 old values + 1 new value
16

Requirement:

- Tension meter switched on as described in Chapter 3.2.1.

To change the damping factor:

- Press and hold the DAMP key.
The display shows the set damping factor.
You can now increase the damping factor with the MEM key and decrease it with the
RECALL key.

- Release the DAMP key.
The tension meter switches back to measuring mode.

The selected damping factor remains stored in the MST memory even after the
instrument is switched off.

DAMP below the current reading.

only the current reading.

12

22

CN

23

CN

24

CN

21

CN

3.4 Storing the Tension Values

3

cNMem

3

cNMem

The tension meter features a data logger which stores the following data obtained during
a measuring period:
Average value,
Last value,
Maximum value (MAX),
Minimum value (MIN),
Minimum peak value (MIN PEAK) (lowest single value measured),
Maximum peak value (MAX PEAK) (highest single value measured).
The measured data remain stored in the MST memory even after the instrument is
switched off.

Requirements:

- Tension meter switched on as described in Chapter 3.2.1.

- UPPER or LOWER THREAD inserted as described in Chapter 3.3.

To store the tension values:

- Press the MEM key to start the measuring period.

While the tension data are stored, the MEM
and the currently measured value is displayed.

- When you want to end the measuring period, press the MEM key 4 once again.
Data logging is stopped.

The DISPLAY shows

3.4.1 Recalling the Stored Tension Values Requirement:

- Tension meter switched on as described in Chapter 3.2.1.
You can end recall any time by pressing the POWER key.

To recall the tension values:

- Press the RECALL key.

The DISPLAY blinks, showing

and the symbol.

- Press the RECALL key.

The DISPLAY blinks, showing

- Press the RECALL key.

The DISPLAY blinks, showing
and the symbol.

- Press the RECALL key.

MEM and the current reading.

the average value of the measuring period

the last value of the measuring period.

the maximum value of the measuring period

indicator blinks on the DISPLAY

The DISPLAY blinks, showing
and the symbol.

the minimum value of the measuring period

13

26

PeakcN

19

PeakcN

3

cNMem

3.4.1 Recalling the Stored Tension Values (Cont.)

23 8:.

cN

3

cN

- Press the RECALL key.

The DISPLAY blinks, showing
period, the PEAK indicator and the

- Press the RECALL key.

The DISPLAY blinks, showing
period, the PEAK indicator and the symbol.

- Press the RECALL key.
The tension meter switches back to measuring mode.

The DISPLAY shows
The tension meter is ready for a new measuring period. The previously stored tension
values will then be overwritten with new values.

3.4.2 Clearing the MST Memory

If values are stored in the MST memory, the

DISPLAY shows e.g.

To clear the memory:

- Simultaneously press the MEM and RECALL keys.

The DISPLAY shows e.g.
deleted.

MEM and the current reading.

with the MEM indicator.

the maximum peak value of the measuring

symbol.

the minimum peak value of the measuring

; all values stored in the memory have been

3.4.3 Memory Function HOLD

When the tension meter memory is empty, you can retain the last reading on the
DISPLAY by using the memory function HOLD.

To retain the last reading:

- Press the RECALL / HOLD key for approx. one second.

The DISPLAY shows

To switch back to measuring mode:

- Press the RECALL / HOLD key for approx. one second.
The tension meter switches back to measuring mode.

the last reading and the “:” colon symbol.

14

EEE

6

CN

–+

3.5 Error Messages Error message 1:

- The DISPLAY shows
The upper limit of the tension range was exceeded by more than 10%.
Reduce the line tension
OR
AUTO ZERO is no longer possible.
Recalibrate the instrument following the directions in Chapter 3.7.1.

Error message 2:

- The DISPLAY shows .
The lower limit of the tension range was fallen below by more than 10%.
Properly insert the process material
OR
AUTO ZERO is no longer possible.
Recalibrate the instrument following the directions in Chapter 3.7.1.

Error message 3:

- The DISPLAY shows
The battery is low and must be replaced immediately. Operating the tension meter with
a low battery may cause measurement errors.

.

.

15

3.6 Verification of Measuring Accuracy

E - 0

cN

All tension meters are calibrated with standard materials - such as polyamide monofila­ment (PA) - according to the SCHMIDT factory procedure. Any difference in process ma­terial size and rigidity from the standard material may cause a deviation of the accuracy. In
95% of all industrial applications the SCHMIDT calibration has been proven to provide the
best results and is used for comparative purposes.

Requirements:

- The MST is factory calibrated for a verti­ cal material path (fig. 3.6).
The verification of accuracy must also be
carried out with a vertical material path.
Tension meter switched on as described
in Chapter 3.2.1.

- The required reference weight must be
provided.

- Hang a weight which corresponds to the
tension to be measured (pay attention to
the correct unit of measure) from the
measured material, vertically, as shown
here. The weight must hang freely, there­ fore, place the instrument near the edge
of the table, if necessary.

Verification procedure:

- Clamp the process material in the rub­ ber groove of the motor-driven DELIV­ ERY ROLLER and thread it through the
MEASURING ROLLERS.
The correct material path is indicated by
the red material path symbol on the front of the tension meter.

- The tension value shown on the DISPLAY should be equal to the value of the suspended
weight (pay attention to the measuring units).
If this procedure shows a deviation, you can recalibrate the instrument following the direc­tions in Chapter 3.7.

Weight

DELIVERY ROLLER

MEASURING
ROLLERS

fig 3.6

3.7 Calibration of the MST

Requirements:

- The MST is factory calibrated for a vertical material path (fig. 3.6.).
Recalibration must also be carried out with a vertical material path.

- One cN weight each, corresponding to 10%, 50% and 90% of the tension range, must be
provided.

- No process material inserted.

- Tension meter switched off.

To select the calibration mode:

- Press and hold the MEM and POWER keys until the DISPLAY shows

- Release first the POWER key and then the MEM key.

16

.

800

cN

E - 10

cN

1000

cN

E - 50

cN

E - 10

cN

3.7 Calibration of the MST (Cont.)

To calibrate the zero point:

- Press the MEM key.
As long as the MEM key is depressed,
the DISPLAY shows a random decimal
value between 500 and 1200 e.g.

This decimal value may vary from
instrument to instrument.
Write down the decimal value.

- Release the MEM key when the value
shown on the DISPLAY is fairly stable
(the reading might fluctuate greatly).

.

DELIVERY ROLLER

MEASURING
ROLLERS

The display 2 shows

1st calibration point:

- Hang a weight which corresponds to
10% of the tension range from the
measured material, vertically, as
shown in fig. 3.6.

- Clamp the process material in the rub­ ber groove of the motor-driven DELIV­ ERY ROLLER and thread it through the MEASURING ROLLERS.
The correct material path is indicated by the red material path symbol on the front of the
tension meter.
a) Press the MEM key.
As long as the MEM key is depressed, the DISPLAY shows a decimal value which is

higher by approx. 200 than the first decimal value, e.g.
This decimal value may vary from instrument to instrument.
Write down the decimal value.

- Release the MEM key when the value shown on the DISPLAY is stable (the reading
might fluctuate greatly).

The DISPLAY shows

If the display shows
Check the suspended weight and the material path between the MEASURING
ROLLERS and repeat the procedure from step a.

2nd calibration point:

- Hang a weight which corresponds to 50% of the tension range from the measured
material, vertically, as shown in fig. 3.6.

- Clamp the process material in the rubber groove of the motor-driven DELIVERY
ROLLER and thread it through the MEASURING ROLLERS.
The correct material path is indicated by the red material path symbol on the front of the
tension meter.

.

Weight

.

again, the value was not accepted.

fig 3.6

.

17

3.7 Calibration of the MST (Cont.)

1800

cN

E - 90

cN

E - 50

cN

- - - -

cN

E - 90

cN

b) Press the MEM key 4.
As long as the MEM key is depressed,
the DISPLAY shows a decimal value
which is higher by approx. 800 than the

DELIVERY ROLLER

second decimal value, e.g.
This decimal value may vary from
instrument to instrument.
Write down the decimal value.

- Release the MEM key when the value
shown on the DISPLAY is stable (the
reading might fluctuate greatly).

The DISPLAY shows

If the DISPLAY shows
the value was not accepted. Check the
suspended weight and the material path
between the measuring rollers and re­ peat the procedure from step b.

3rd calibration point:

- Hang a weight which corresponds to 90% of the tension range from the measured
material, vertically, as shown in fig. 3.6.

- Clamp the process material in the rubber groove of the motor-driven DELIVERY
ROLLER and thread it through the MEASURING ROLLERS.
The correct material path is indicated by the red material path symbol on the front of the
tension meter.
c) Press the MEM key.

- Release the MEM key.

.

.

again,

Weight

MEASURING
ROLLERS

fig 3.6

The DISPLAY shows
The new calibration has been stored.

If the DISPLAY shows
Check the suspended weight and the material path between the measuring rollers and
repeat the procedure from step c.

- Press the POWER key.
The tension meter switches off.
Verify the new calibration, following the directions in Chapter 3.6.
If this procedure shows a deviation, you can recalibrate the tension meter again or restore
the factory calibration as described in Chapter 3.7.2.
If the verification of the calibration according to Chapter 3.6 shows a deviation beyond the
allowable tolerance and a reliable operation is no longer allowed, the instrument has to be
returned to Hans Schmidt & Co GmbH for factory recalibration. Please follow the ship­ping instructions given in Chapter 8.

.

again, the value was not accepted.

18

3.7.1 Error Messages During Calibration

EEE

-EEE

E - 0

cN

- - - -

cN

The following error messages might be displayed during the calibration of the tension
meter:

- The DISPLAY shows
The weight suspended from the process material is too heavy.

- The DISPLAY shows
The weight suspended from the process material is too light.

3.7.2 Restoring the Factory Calibration

You can restore the factory calibration any time with the following procedure:

Requirement:

- Tension meter switched off.

To restore factory calibration:

- Press and hold the MEM and POWER keys until the DISPLAY shows

- Release first the POWER key and then the MEM key.

- Press and hold the DAMP and RECALL keys, then additionally press and hold the

MEM key until the DISPLAY shows
The factory calibration is restored.

- Release the DAMP, RECALL and MEM keys

- Press the POWER key.
The instrument switches off.

.

.

.

.

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4 PC Communication (RS-232-C Interface)

4.1 WINDOWS Terminal Program

The measured values and the mem­ory contents can be transmitted over
the RS-232 interface to a personal
computer. You can connect the com­puter to the connector of the MST
by using the ET2-CC special cable
which is available as an accessory.
The pin assignment of the connector
is described in Chapter 2.2.

Requirement:
A communication program, such as
Terminal or HyperTerminal (provided
on MS Windows Version 3.0 or later)
must be installed and configured on
the computer.

Commands for communication with a PC (polling)

ASCII

Code

Function Description

Continuous

D

transmission

d Send

m Save

r Output

c

a

z Zero

Clear

memory

Damping

ON / OFF

Continuous trans­mission of read­ings.
Press any key to
stop transmission.

Transmit current
reading to PC
once.

Start logging of
measured data.
Stop data logging.

Output the memory
contents to the PC.

Delete the memory
contents.

Switch damping on
or off.

Carry out zero
adjustment of the
instrument.

4.2 TENSION INSPECT ET2-P1 SCHMIDT software (Win 95 or higher) for viewing and storing the measured data on a PC

(optionally available).

20

5 Service and Maintenance

i

i

The tension meter is easy to maintain. Depending on operating time and load, the ten­sion meter should be checked according to the locally valid regulations and conditions
(as described in Chapter 3.6). The use of other test methods than the procedure de­scribed in Chapter 3.6 may cause deviating measuring results.

6 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 cleaning.

21

7 Verification of Calibration and Determination of Repair Costs

Delivery

Visua฀inspection

and฀functional฀test

Unit฀can฀be

calibrated

(functional)

Verification฀of฀the

calibration

prepare฀certification

for

incoming฀calibration

Values฀within

specification

Determination

of฀costs

Repair฀costs

exced฀40฀%฀of฀as

new฀value

Make฀of

cost฀estimate

Costs฀approved

by฀customer

Calibration฀label

on฀the฀instrument

Verification฀of

the

calibration

Repair฀and

adjustment

Prepare฀certificate

for฀outgoing

calibration

Invoice฀repair฀and

calibration฀sercices

dispatch

Yes

No

Invoice฀scrapping

and฀disposal

Invoice

calbration฀services

and฀dispatch

Yes

No

No

Yes

No

Yes

Flow chart for verifying the calibration of used tension meters, incoming and outgoing
verification with Inspection Certificate 3.1 according to DIN EN 10204

22

8 Correspondence

i

Should you have any questions regarding the tension meter or Operating Instructions, or
their use, please indicate above all the following details which are given on the ID plate:

1) The tension meter model

2) The serial number

9 Repairs

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 tension meter with a detailed fault description to
our service department. Please indicate in your order whether you require an Inspection
Certificate 3.1 according to DIN EN 10204.

Service address:

Notes:

Subject to change without notice!

23