Check-line DXN Manual de usuario

CHECK

•LINE

BY ELECTROMATIC

DXN

Operating Instructions

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

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

7.0 DXN MODEL DATA & SPECIFICATIONS

Accuracy* ± 1% of full scale or

± 1 graduation mark

on scale

Diameter of Scale 54 mm

Maximum Speed

(standard) 2000 m/min

(optional) 3500 m/min (K)

(optional) 5000 m/min (HS)

Outer roller distance, c:c

DXN-30 to DXN-1000 EX 38 mm

DXN-200 to DXN-10K 100 mm

DXN-2K 150 or 200 mm

DXN-30K to DXN-50K 250 mm

Roller material

(standard) Hard-coated aluminum

(optional) Hardened steel (ST)

Ceramic (CE)

Phenolic (PH)

Housing material Die-cast aluminum

Dimensions 260 x 72 x 44 mm

(10.2 x 2.8 x 1.7 in.)

Weight 700 g (1.5 lbs.), approx.

* Using factory standard materials and procedures. Special calibration using

customer sample is available.

Specifications subject to change without notice.

OI803N

211

1.0 OVERVIEW & OPERATING PRINCIPLE

DXN Tension Meters are hand-held, mechanical

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

tension 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.

6.3 Air Dashpot Damping

DXN Tension Meters incorporate a moderate amount

of movement damping to smooth out some high fre-

quency 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 damp-

ing rate just to

the point where a

readable pointer

results with minimal

pointer swings. The amount of damping is set by turn-

ing the small slotted screw or hex-head screw of the

damping assembly located near the guide-roller mount-

ing 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.

Adjustment Screw

10 3

2.0 OPERATING ELEMENTS6.0 OPTIONS

6.1 High-Speed Guide Rollers

DXN guide roller assemblies are rated 2000

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

roller assemblies are optionally available:

“K” Roller Assembly : 3,500 meters/min., maximum

“HS” 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.

Roller Guides

Measuring Roller

Scale

Thumbpiece

Sample Holding Clip

Measured Material

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, 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.

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 DXN instruments are furnished with a

Calibration Certificate which certifies that they have

been calibrated in accordance with factory procedures

and were found to meet all published accuracy specifi-

cations, 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,

marking 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

numbering 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 Special Calibration Fixture and metric wrench.

A full, detailed calibration procedure is available upon

request.

5.1 Calibration with Factory Standard Filaments

All DXN 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 significant

and can be ignored since readings are generally treat-

ed 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 (Grams) Dia. (mm)

DXN-50 5-50 0.12

DXN-120 20-120 0.12

DXN-200 20-200 0.12

DXN-400 20-400 0.20

DXN-1000 50-1000 0.30

DXN-2000 200-2000 0.50

DXN-5000 400-5000 0.80

DXN-10K 2-10 Kg 1.00

DXN-20K-L 5-20 Kg 1.50

DXN-30K-L 5-30 Kg 1.50

DXN-50K-L 5-50 Kg 1.50 (steel rope)

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