HBM WI Series Mounting instructions

Mounting Instructions | Montageanleitung |

Notice de montage

English Deutsch Français

WI

Hottinger Baldwin Messtechnik GmbH

Im Tiefen See 45

D-64293 Darmstadt

Tel. +49 6151 803-0

Fax +49 6151 803-9100

[email protected]

www.hbm.com

Mat.: 7-2001.1243

DVS: A01028_05_Y00_01 HBM: public

09.2019

E Hottinger Baldwin Messtechnik GmbH.

Subject to modifications.

All product descriptions are for general information only.

They are not to be understood as a guarantee of quality or

durability.

Änderungen vorbehalten.

Alle Angaben beschreiben unsere Produkte in allgemeiner

Form. Sie stellen keine Beschaffenheits- oder Haltbarkeits

garantie dar.

Sous réserve de modifications.

Les caractéristiques indiquées ne décrivent nos produits

que sous une forme générale. Elles n'impliquent aucune

garantie de qualité ou de durabilité.

Mounting Instructions | Montageanleitung |

Notice de montage

English Deutsch Français

WI

2 A01028_05_Y00_01 HBM: public WI

English

1 Safety instructions 3........................................

2 Markings used 5............................................

2.1 The markings used in this document 5..........................

2.2 Symbols on the product 5.....................................

3 Scope of supply 6..........................................

3.1 Accessories 6...............................................

4 Introduction 6..............................................

5 Structure and mode of operation 7...........................

6 Electrical connection 8......................................

6.1 Cable extensions 9..........................................

7 Mounting 10.................................................

7.1 Adjusting the centering 11.....................................

7.2 Initial stroke adjustment 12.....................................

7.3 Direct calibration 13...........................................

7.4 Measurement circle 13........................................

7.5 Frequency and acceleration limits 14............................

8 Interference effects 15.......................................

8.1 Shielding design 15...........................................

8.2 Grounding 15................................................

9 Dimensions 16..............................................

10 Mounting set 20.............................................

11 Specifications 21............................................

Safety instructions

WI A01028_05_Y00_01 HBM: public 3

1 Safety instructions

Use in accordance with the regulations

Displacement transducers of the WI series are intended for displacement

measurements such as in test rigs, for installation in measurement stands and

all types of measuring apparatus for testing and checking workpieces and for

checking processes in manufacturing or the construction industry.

Use for any additional purpose shall be deemed to be not in accordance with

the regulations.

In the interests of safety, the transducer should only be operated as described

in the Mounting Instructions. It is also essential to observe the appropriate legal

and safety regulations for the application concerned during use. The same

applies to the use of accessories.

The transducer is not a safety element within the meaning of its use as

intended. Proper and safe operation of this transducer requires proper

transportation, correct storage, assembly and mounting and careful operation

and maintenance.

General dangers of failing to follow the safety instructions

The WI displacement transducer corresponds to the state of the art and is

fail‐safe.

The transducers can give rise to residual dangers if they are inappropriately

installed and operated by untrained personnel.

Everyone involved with the installation, commissioning, maintenance or repair

of a displacement transducer must have read and understood the mounting

instructions and in particular the technical safety instructions.

Remaining dangers

The scope of supply and performance of the transducer covers only a small

area of displacement measurement technique. In addition, equipment planners,

installers and operators should plan, implement and respond to the safety

engineering considerations of displacement measurement technique in such a

way as to minimize remaining dangers. Prevailing regulations must be

Safety instructions

4 A01028_05_Y00_01 HBM: public WI

complied with at all times. There must be reference to the remaining dangers

connected with displacement measurement technique.

Conversions and modifications

The transducer must not be modified from the design or safety engineering

point of view except with our express agreement. Any modification shall

exclude all liability on our part for any damage resulting therefrom.

Qualified personnel

This instrument is only to be installed by qualified personnel strictly in

accordance with the technical data and with the safety rules and regulations

which follow. It is also essential to observe the appropriate legal and safety

regulations for the application concerned. The same applies to the use of

accessories.

Qualified personnel means persons entrusted with the installation, fitting, com

missioning and operation of the product who possess the appropriate qualifica

tions for their function.

Conditions on site

Protect the transducer from damp and weather influences such as rain, snow,

etc.

Accident prevention

The relevant accident prevention regulations of the trade safety associations

must be taken into account.

Markings used

WI A01028_05_Y00_01 HBM: public 5

2 Markings used

2.1 The markings used in this document

Important instructions for your safety are specifically identified. It is essential to

follow these instructions in order to prevent accidents and damage to property.

Symbol Significance

Notice

This marking draws your attention to a situation in

which failure to comply with safety requirements can

lead to damage to property.

Emphasis

See….

Italics are used to emphasize and highlight text and

references to other chapters and external docu

ments.

2.2 Symbols on the product

CE mark

The CE mark enables the manufacturer to guarantee that

the product complies with the requirements of the rele

vant EC directives (the declaration of conformity is avail

able at http://www.hbm.com/HBMdoc

).

Scope of supply

6 A01028_05_Y00_01 HBM: public WI

3 Scope of supply

S Displacement transducer with fitted cable

S Operating Manual

3.1 Accessories

Mounting kit:

8 mm mounting block and tool, order no.: 1-WZB8

4 Introduction

The WI series of inductive miniature displacement transducers is designed to

be particularly compact. The transducers feature a clamping shaft of only 8 mm

and an extremely short total length.

Interrelationship between nominal displacement and total length

The transducer with the nominal displacement of 2 mm is only 66 mm long, for

the nominal displacement of 5 mm the length is 79 mm and for a nominal

displacement of 10 mm only 95 mm.

For reciprocating measurement objects or if no other means exist, the probe

versions are used.

The probe pin with the plunger is easily installed in a guideway, being not only

free from backlash and non‐wearing, but also spring‐loaded to keep it pressed

against the measurement object.

WI inductive miniature displacement probes are therefore suitable as precision

measuring probes in measurement stands and measuring apparatus.

Structure and mode of operation

WI A01028_05_Y00_01 HBM: public 7

5 Structure and mode of operation

The transducers consist of a ferromagnetic core and a coil tube, on which are

located two measuring coils arranged in tandem, together forming an inductive

half bridge.

The ferromagnetic core is mounted on a non‐magnetic rod and located in the

center of the coil system. Axial displacements of the core lead to an opposite

change in the impedance of the measuring coils.

A ferrite tube acts as an enclosure surrounding the coil system and at the same

time forms the magnetic shielding. Under a plastic molding are resistors with

which to adjust the sensitivity of the transducers and which also form the

extension to the full bridge.

In the probe versions there are guideways made of antifriction metal on the

core rod, giving access to the coil tube. A spiral spring pushes the probe pin

forward against the measurement object. On the tip is an measurement insert

according to DIN 878 with a threaded pin M2.5 and a 1/8” carbide ball.

Notice

The measurement insert is locked using a medium‐strength threadlocker.

Electrical connection

8 A01028_05_Y00_01 HBM: public WI

6 Electrical connection

WI series inductive miniature displacement transducers are intended to be

operated on 4.8 kHz carrier‐frequency amplifiers. The principle of

measurement corresponds to the differential inductance coil principle.

The principle of measurement is based on an active half bridge that is

expanded internally to a full bridge connection. The displacement transducers

can be used in full‐bridge and half‐bridge mode.

The connections for transducers, a possible cable extension and measuring

amplifiers are shown in Fig. 6.1.

WH (white) Measurement signal ())

BU (blue) Excitation voltage (+)

RD (red)

1)

Measurement signal (-)

GY (gray) Sensor circuit (-)

GN (green) Sensor circuit (+)

Cable shield Transducer housing

BK (black) Excitation voltage (-)

1)

When used in full bridge connection, otherwise not used

0 )

Fig. 6.1 Electrical schematic diagram of a full bridge, six‐wire extension

Connecting to terminals:

S The shield can be accessed through a notch in the cable sheath

S Place the shield flat on the body of the casing.

Fitting to a connector:

S Place the shield flat on the connector the casing.

The bridge misalignment is positive when the core is pushed inward.

The bridge misalignment is negative when the core is pushed outward. The

output voltage is zero in the middle of the measuring range.

Electrical connection

WI A01028_05_Y00_01 HBM: public 9

In order to keep the size down, the transducer is not fitted with integrated

sense leads for operating in a six‐wire circuit.

When operating with a six‐wire measuring amplifier therefore, the feedback

inputs must be connected to the appropriate supply leads (see Fig. 6.1).

The effect of the fitted four‐wire cable is taken into account during factory

calibration.

6.1 Cable extensions

When operating with a six‐wire measuring amplifier the cable can be extended

without any ill effects (maximum 200 meters).

The prerequisite for this is the use of a high‐grade, low‐capacitance

measurement cable. The supplementary sense leads (HBM colors gray and

green) then assess the voltage at the transducer connection and feed it back to

the six‐wire measuring amplifier. This regulates the voltage so that it reaches

the transducer loss‐free.

Mounting

10 A01028_05_Y00_01 HBM: public WI

7 Mounting

The transducer has a clamping shank Ø8

+0.05

. It can be clamped along the

entire length of the metallic enclosure tube.

It must be clamped so that the enclosure tube is not distorted by clamping

forces. The fitted connection cable must not be subjected to loads by pulling or

vibration.

The contact force of the probe is dependent on the installation site.

In the event of loading due to acceleration, e.g. due to vibrations, oscillations

etc., please refer to chapter 7.5 ”Frequency and acceleration limits”, page 14.

Notice

Never apply force to the plastic potting compound during mounting. No tor

sional load must be applied to the plastic connection or the metal housing.

Mounting

WI A01028_05_Y00_01 HBM: public 11

7.1 Adjusting the centering

Spring pressure on the stop puts the probe in the rest position. The initial

stroke as far as the start of the measuring range is around 0.5 mm.

At this point the transducer has its maximum negative output signal.

The initial stroke is followed by the nominal measuring range, in the middle of

which is the electrical zero point.

Initial stroke approx. 0.5mm

Measuring range

Free stroke

Start of measuring

range

Initial stroke

Displacement

Free stroke

Start of measuring

range

Fig. 7.1 Initial stroke, measuring range, free stroke

From the end of the measuring range (max. positive output signal) to the end

stop is a free stroke. The free stroke depends on the measuring range.

Alternatively the measuring range can be found as in the case of a free

plunger:

With a neutral amplifier setting (no zero point adjustment, no tare) adjust the

probe pin to a zero display. Half the measurement displacement lies on either

side of this position.

Mounting

12 A01028_05_Y00_01 HBM: public WI

7.2 Initial stroke adjustment

The stop for the probe pin (rest position) determines the initial stroke, that is,

the distance to the start of the measuring range. This initial stroke can be

adjusted if it is preferred that the rest position and the start of the measuring

range should be the same. The initial stroke also enables measurements to be

taken over the whole of the nominal measuring range.

Shortening the initial stroke can be helpful for workpiece checking if the probe

has already been moved up very close to the expected value.

Adjusting the initial stroke

S Loosen the internal hexagonal socket head bolt in the bore hole of the

hexagonal nut using a hexagonal screwdriver a.f. 1.3 mm (1)

Hexagonal nut

Internal hexagonal

screw

(1)

(2)

(3)

S During the adjustment procedure hold the probe pin in front of the probe tip

(2).

S Adjust the initial stroke by turning the hexagonal nut (3) using an open‐end

wrench and an internal hexagonal socket wrench, and then use the internal

hexagonal socket head bolt to stop the nut (1) from twisting.

Mounting

WI A01028_05_Y00_01 HBM: public 13

7.3 Direct calibration

Adjust each WI displacement transducer to the same span of the output signal.

This enables interchangeability when the measuring amplifiers are the same.

For very precise measurements, we recommend direct calibration using gage

blocks or templates with dimensions corresponding to the displacement,

movement or change in length that you wish to measure.

When there are cable extensions, the entire cable length should be included in

the calibration procedure.

More notes on calibration can be found in the appropriate operating manual for

the selected amplifier.

7.4 Measurement circle

The measurement circle means the sum of all the dimensions included in the

displacement measurement, that is, the dimensions of the

S transducer

S core or probe pin

S workpiece

S workpiece fastener

S transducer fastener

Temperature changes shift the zero signal of the inductive measurement

system by a small amount. Also the nominal output span of the transducer

changes with temperature (for max. temperature variations see chapter 11

“Specifications”, page 21).

In most cases a temperature change results in the thermal expansion of

different materials in the measurement configuration itself. When high levels of

precision are required it is essential to take account of every thermal expansion

in the measurement circle. The specifications apply to clamping with the aid of

steel parts with a thermal expansion of 11 x 10

-6

/ °C.

Mounting

14 A01028_05_Y00_01 HBM: public WI

7.5 Frequency and acceleration limits

The measurement frequency range of the measurement chain has to be

determined electrically from the upper cut‐off frequency of the amplifier. You

can find the appropriate data in the operating manual for your amplifier.

Maximum permissible acceleration has a decisive effect on the mechanical

characteristics of the displacement transducer (see chapter 11 “Specifications”,

page 21).

In the case of displacement probes, care must be taken that the probe pin does

not withdraw from the measurement object due to inertia.

To a first approximation, many tasks may generally be regarded as sinusoidal.

At maximum permitted acceleration a

max

with given displacement amplitude s

the mechanical cut‐off frequency f

max

is:

f

max

= 1 /(2 π) Ǩ(a

max

/ s)

Interference effects

WI A01028_05_Y00_01 HBM: public 15

8 Interference effects

Carrier frequency transmission is highly insensitive to electrical interference.

Even so, high‐intensity interference can falsify measurements.

Interference can be injected into a measuring circuit from a source which is:

S electromagnetic,

S inductive,

S galvanic,

S mechanical.

Interference is most commonly caused by:

S high‐power transmission lines running parallel to the measurement circuit

S nearby relays (contactors)

S electric motors

S potential differences in the grounding system or polyphase grounding of the

measurement chain

S potential differences caused by capacitive influences

S vibration

8.1 Shielding design

Using HBM's Greenline shielding design ensures that the entire measurement

chain is completely enclosed in a Faraday cage, due to the special way the

cable shield is arranged (see also reprint G36.35.0, Greenline shielding

design).

8.2 Grounding

All devices - transducers, amplifiers and display devices - are located on

a ground potential (if necessary wire to a potential equalization line).

If this is not possible, the transducer should be fitted ground‐isolated.

Dimensions

16 A01028_05_Y00_01 HBM: public WI

9 Dimensions

Measuring range 2 mm

Initial stroke 0.5 mm

Free stroke approx. 5 mm

66

ø3

43

29

Position when probe pin

driven in

a.f. 5

Plastic molding

Measurement insert

threaded M 2.5 to DIN 878

Carbide ball 1/8”

Starting position

ø5.7

to DIN 7168 coarse

Ø8

+0.05

approx.

12

Fig. 9.1 WI/2mm-T

Dimensions

WI A01028_05_Y00_01 HBM: public 17

Initial stroke 0.5 mm

Measuring range 5 mm

Free stroke approx. 2.5 mm

79

ø3

56

42

Position when probe pin

driven in

a.f. 5

Measurement insert threaded

M 2.5 to DIN 878

Carbide ball 1/8”

Starting position

Plastic molding

ø5.7

to DIN 7168 coarse

Ø8

+0.05

approx.

12

Fig. 9.2 WI/5mm-T

Dimensions

18 A01028_05_Y00_01 HBM: public WI

Initial stroke 0.5 mm

Measuring range 10 mm

Free stroke approx. 1.5 mm

95

ø3

65

52

Position when probe pin driven in

a.f. 5

Measurement insert threaded

M 2.5 to DIN 878

Carbide ball 1/8”

Starting position

Plastic

molding

ø5.7

to DIN 7168 coarse

Ø8

+0.05

approx.

16

Fig. 9.3 WI/10mm-T

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