Check-line DX2/DXX Manual de usuario

CHECK

•

LINE ®

BY ELECTROMATIC

DX2/DXX

Operating Instructions

Also applies to Special Purpose Models: FX, FX2,

RX/BX, RX2/BX2, DXFT, DX2FT, TX, TX2, KXB

Distributed by: ABQ Industrial LP USA

Tel: +1 (281) 516-9292 / (888) 275-5772 eFax: +1 (866) 234-0451

Web: https://www.abqindustrial.net E-mail: [email protected]

12 1

CONTENTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page

1.0 Overview & Operating Principle . . . . . . . . . . . . . . . 2

2.0 Operating Elements . . . . . . . . . . . . . . . . . . . . . . . . . 3

3.0 Thickness Compensation . . . . . . . . . . . . . . . . . . . . . 4

4.0 Quick Start Instructions . . . . . . . . . . . . . . . . . . . . . 5

5.0 Calibration Notes . . . . . . . . . . . . . . . . . . . . . . . . . 6

5.1 Calibration with “Standard” Filaments

5.2 Special Calibration

5.3 NIST Calibration

5.4 Calibration Verification Schedule

6.0 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.1 High-Speed Guide Rollers

6.2 Lever Assembly

6.3 Air Dashpot Damping

6.4 Memory Pointer

7.0 Model Data & Specifications . . . . . . . . . . . . . . . . . 12

Appendix – DX2 Special-Purpose Models . . . . . . . 13

7.0 DX2 MODEL DATA & SPECIFICATIONS*

Accuracy** ± 1% of full scale or

± 1 graduation mark

on scale

Diameter of Scale 41 mm

Maximum Speed

(standard) 2000 m/min

(optional) 3500 m/min

(optional) 5000 m/min

Outer roller distance, c:c

DX2-5 to DX2-EX 38 mm

DX2-200 to DX2-1K 100 mm

DX2-2K 150 or 200 mm

DXX-3K to DXX-5K 250 mm

Roller material

(standard) Hard-coated aluminum

(optional) Hardened steel (ST)

Chromed steel (W)

Ceramic (CE)

Plastic (PL)

Temperature limits 45–115 °F (8 – 45 °C)

Humidity, maximum 85%

Housing material Die-cast aluminum

Dimensions 8.6 x 3.5 x 1.7 in.

(225 x 90 x 44 mm)

Weight (up to DX2-1K) 1.1 lbs, (500 g) approx.

Weight (DX2-2K) 2.0 lbs, (900 g) approx.

* Except for minor differences in physical dimensions, above specifications also

apply to DXX instruments.

** Using factory standard materials and procedures. Special calibration using

customer sample is available.

Specifications subject to change without notice.

211

1.0 OVERVIEW & OPERATING PRINCIPLE

DX2 and DXX Tension Meters are hand-held, mechani-

cal instruments which accurately measure the running

as well as static tensions of a wide variety of process

materials including yarns, fibers, wires, optical fibers,

tapes, etc. They employ the 3-roller principle for ten-

sion measurement where the outer two reference guide

rollers remain fixed during measurement to establish a

wrap angle over the middle sensing roller. The middle

roller, acting against an internal calibrating spring, is

displaced relative to the running line tension. This

displacement is converted to a rotary motion to turn a

pointer on a scale to give a reading in grams tension.

NOTES: 1) While illustrations show the Type DX2

Tension Meter, all references also

apply to the Type DXX and Special-

Purpose Tension Meters as well.

2) DX2 Special Purpose Types, including

FX2, TX2, DX2F, RX2/BX2 and KXB,

are shown in the Appendix at the end

of these instructions. They all use the

3-roller principle for tension measure-

ment except that head configurations

and roller assemblies are different,

having been designed for special

applications, as noted in the

Appendix.

6.3 Air Dashpot Damping

DX2 and DXX Tension Meters incorporate a moderate

amount of movement damping to smooth out some

high frequency tension fluctuation. However, where

process fluctuations result in rapid pointer swings

which make it difficult or near impossible to read the

scale, an optionally-available Air Dashpot Damping

mechanism can be provided to slow down the pointer

swings to permit a reading.

In setting up the mechanism,

it is best to set the damping

rate just to the point where

a readable pointer results

with minimal pointer swings.

The amount of damping is

set by turning the small

slotted screw or hex-head screw of the damping

assembly located near the guide-roller mounting

bracket. The Air Dashpot must be installed at time

of original manufacture. It cannot be added later.

CAUTION: Do not set damping rate too high as

this will damage the movement.

6.4 Memory Pointer

The optional Memory Pointer

assembly retains the highest reading

obtained during a measuring period.

Before using the instrument, rotate

the knurled pointer knob clockwise

until the “memory” pointer tab

contacts the measuring pointer at

zero. During operation and after

instrument removal, the trailing

“memory” pointer will hold the maximum reading until

reset with the pointer knob.

10 3

2.0 OPERATING ELEMENTS6.0 OPTIONS

6.1 High-Speed Guide Rollers

DX2 and DXX guide roller assemblies are rated 2000

meters/min., maximum. The following high-speed

roller assemblies are optionally available:

“K” Roller Assembly : 3,000 meters/min., maximum

“U” or “DHS” Assembly : 5,000 meters/min., maximum

All high speed roller assemblies must be initially

installed by the factory or an authorized service

facility.

6.2 Lever Assembly

On high-range instruments, the return spring force

must be strong enough to bring the outer rollers back

to their original position during measurement. The

average person will find it difficult to operate the

mechanism just with thumb pressure on the Thumb

Piece alone. (This is especially true with models rated

20 kg and higher.) Adding the Lever Assembly shown

here will greatly reduce the effort required to open and

close the 3-roller system. The Lever Assembly must

be installed by the factory or an authorized service

facility.

3.0 THICKNESS COMPENSATION

The 3-roller system for

tension measurement relies

on the displacement of the

middle roller to give an

indication of line tension.

As the material diameter

or thickness changes, there

will be a change in tension

reading, even though line

tension has not changed. To

offset this effect, high-range

instruments (1000 grams and higher) are usually fur-

nished with a Thickness Compensator, as shown here.

To determine whether the Compensator needs to be

used for a specific application, take readings with and

without the process sample in the Compensator using

a hanging weight approximately equal to the process

operating tension.

To set up the Thickness Compensator, proceed as

follows:

1. With the Thumb Piece pushed forward and held,

pass a sample of the process material through the

opening at the instrument end, as pictured here,

making sure it lies between the two visible

disc-like anvil surfaces.

2. Allow the Thumb Piece to SLOWLY return to its

original position.

CAUTION: Do not let the Thumb Piece snap

back as this may affect calibration and also

damage the instrument.

3. Secure the process sample ends under the spring

clip provided or with some tape. The instrument

is now ready to use

5.4 Calibration Verification Schedule

Frequency of calibration accuracy verification depends

on many factors. These include frequency and extent

of tension overloads, operating speeds, length of oper-

ating times, environment, care in handling, etc. Such

determination is best made by the user’s Quality

Assurance Department based on the user's experience.

However, a quick calibration check near the anticipat-

ed process tension levels should be done to confirm the

integrity of the instrument, as follows:

1. At the beginning of each work session

2. Every time a unit is dropped

3. Whenever process readings seem to be out of

tolerance for no apparent reason

The quick check can be made with a simple load stand,

as shown in 5.0, above, using a sample of the process

material and weights that are close to the tensions

encountered in the process. Be sure to move the

tension meter up and down slowly to simulate the

motion of the running process material. This will check

the condition of the guide roller ball bearings and

remove any inertia effect of the movement. Readings

that change with this motion reversal may indicate the

possibility of a guide roller ball bearing problem.

In the case of wire, which might be slightly deformed

by the action of the 3- roller system during static

measurement, always move to a fresh portion of the

wire each time a measurement is made. (In production,

the instrument always “sees” a fresh portion.)

4.0 QUICK START INSTRUCTIONS

NOTE: If tension meter is equipped with a Thickness

Compensator, first set up Compensator as indicated in

3.0, above.

1. Prior to engaging the material under test, part the

3-roller system by pushing and holding the Thumb

Piece forward.

2. Keeping the outer rollers extended, bring the

instrument behind or under the filament and move

it so that the Filament Guide bars contact the

process material.

3. Slowly release pressure on the Thumb Piece until

the outer rollers return to their original position.

This will automatically direct the material into the

guide roller grooves.

4. The scale pointer will show line tension directly in

grams or kilograms.

5. To remove the instrument from the process

material, push the Thumb Piece forward again to

open the 3-roller system. With the outer rollers

extended, move the instrument away from the

material.

6. Remove the instrument and SLOWLY release

pressure on the Thumb Piece, allowing the outer

rollers to return to their original position.

CAUTION: Do not let the Thumb Piece snap

back as this may affect calibration and also

damage the instrument.

5.2 Special Calibration

Special Calibration is optionally available for a specific

material type and size so long as the material fits the

mechanical limits and range of the instrument. The

customer must supply a 10-ft sample (3 meters) of the

material. Such calibration can be performed with or

without using the Thickness Compensator if one has

been provided with the instrument. If not specified,

the calibration facility will use its best judgment.

Note: Special calibration is available for a single

sample only.

5.3 NIST Calibration

While all DX2 and DXX instruments are furnished

with a Calibration Certificate which certifies that they

have been calibrated in accordance with factory proce-

dures and were found to meet all published accuracy

specifications, such calibrations do not fulfill ISO-9000

requirements since no record of measured values are

kept or are submitted. Where ISO-9000 requirements

are to be met, NIST calibration is optionally available

but must be specified at time of order placement or

after repair.

5.0 CALIBRATION NOTES

The calibration process

involves hanging laboratory

weights from a fixed point,

engaging the vertical line

material which holds the

weights with the tension

meter 3-roller system, mark-

ing a blank dial face where

the scale pointer comes to

rest for each weight used, dividing the spaces between

load “reading” marks and finish marking and number-

ing to show calibration marks and “readings” on the

dial face.

The procedure requires specialized skills and the

following material:

1. A load stand to simulate the setup shown here.

2. A set of precision laboratory weights to cover the

tension range of the instrument.

3. Factory “standard” nylon monofilaments as shown

in the Table on page 7.

4. A Calibration Kit which includes an Alignment

Plate and two (2) special metric wrenches.

A full, detailed calibration procedure is available upon

request.

5.1 Calibration with Factory Standard Filaments

All DX2 and DXX Tension Meters are calibrated with

laboratory weights suspended from factory Standard

nylon monofilament sizes, as noted in the table below.

Any difference in process material size and rigidity

from the Standard materials may result in some error.

For over 95% of applications, the error is not signifi-

cant and can be ignored since readings are generally

treated as production setup values or are used for

comparative purposes. In those cases where highest

accuracy is required, a correction chart showing

Readings vs. Actual Load should be made up by the

user or “Special” calibration should be specified when

an order is placed.

Standard Calibration Monofilament Sizes

Mono-

Range filament

Model Model (Grams) Diam. (mm)

DX2-5 DXX-5 5-50 1000 denier

or 0.15 max.

DX2-12 DXX-12 10-120 0.20

DX2-20 DXX-20 10-200 0.20

DX2-40 DXX-40 10-400 0.25

DX2-SP DXX-SP 20-1000 0.30

DX2-EX DXX-EX 100-1000 0.30

DX2-200 DXX-200 200-2000 0.50

DX2-500 DXX-500 400-5000 0.80

DX2-1K DXX-1K 2-10 kg 1.00

DX2-2K DXX-2K 5-20 kg 1.20

APPENDIX — DX2 SPECIAL-PURPOSE MODELS

Essentially, all DX2 Special

Purpose models operate in

a manner similar to the

standard Type DX2. In

addition, however, they

offer special rollers and

head configurations for

specific applications.

Warp — KXB

Limited Access — DX2F

Tapes — TX2

Webs & Tapes – RX2/BX2

Optic Fibers — FX2

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