HBM W1ELA/0 User manual
A2621−1.0 en/de
Inductive displacement
sensor
Induktiver Wegsensor
W1ELA/0
Mounting instructions
Montageanleitung
English Seite 3 − 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deutsch Page 15 − 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
W1ELA
A05468.0de/en/fr HBM
Contents Page
Safety instructions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Scope of supply 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Introduction 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Structure, principle of measurement 8. . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Instruction for mounting 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Electrical connection 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Measurement 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Plunger in center position 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 Plunger in off−center position 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Disturbing effects 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 Shielding 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2 Grounding 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Specifications (VDI/VDE2638) 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4W1ELA
HBM A2621−1.0en/de
Safety instructions
Use in accordance with the regulations
Displacement sensors in the W1ELA series are intended for displacement
measurements in situations such as test rigs, pressfit devices or the
construction industry. Use for any additional purpose shall be deemed to be
not in accordance with the intended use.
To ensure operational safety, the sensor 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 sensor is not a safety element within the meaning of its use as intended.
Proper and safe operation of this sensor requires proper transportation,
correct storage, assembly and mounting and careful operation and
maintenance.
General dangers due to nonobservance of the safety instructions
The W1ELA displacement sensor corresponds to the state of the art and is
failsafe.
The sensors 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 sensor must have read and understood the Mounting
Instructions and in particular the technical safety instructions.
Residual dangers
The scope of supply and performance of the sensor 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 residual dangers. Prevailing regulations must be complied
with at all times. There must be reference to the residual dangers connected
with displacement measurement technique.
5
W1ELA
HBMA2621−10.en/de
In these mounting instructions residual dangers are pointed out using the
following symbols:
Symbol: DANGER
Meaning: Highest level of danger
Warns of a directly dangerous situation in which failure to comply with safety
requirements will lead to death or serious physical injury.
Symbol: WARNING
Meaning: Dangerous situation
Warns of a potentially dangerous situation in which failure to comply with
safety requirements can lead to death or serious physical injury.
Symbol: CAUTION
Meaning: Possibly Dangerous situation
Warns of a potentially dangerous situation in which failure to comply with
safety requirements could lead to damage to property, slight or moderate
physical injury.
Symbol: NOTE
Refers to the fact that important information is being given about the product
or its use.
Symbol:
Meaning: CE mark
The CE mark is the manufacturer’s guarantee that his product meets the
requirements of the relevant EC directives (the declaration of conformity is
available at http://www.hbm.com/HBMdoc).
6W1ELA
HBM A2621−1.0en/de
Conversions and modifications
The sensor 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 specifications 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,
commissioning and operation of the product who possess the appropriate
qualifications for their function.
Accident prevention
The relevant accident prevention regulations of the trade safety associations
must be taken into account.
7
W1ELA
HBMA2621−10.en/de
1 Scope of supply
•W1ELA/0 with clamp−on strand connection
Fig.1.1: W1ELA/0 displacement sensor
2 Introduction
The type W1ELA inductive displacement sensors are normally installed, for
example in machines, test equipment and measuring instruments. The sen
sors are available with an accuracy class of 0.2 for 4.8 kHz carrier frequency.
The plunger is tuned to the sensor and should not therefore be exchanged for
other W1E plungers.
8W1ELA
HBM A2621−1.0en/de
3 Structure, principle of measurement
The sensors comprise the plunger and core unit. The principle of measure
ment of the W1ELA sensors is based on the differential choke principle. The
sensor body contains two measuring coils arranged axially one after the other,
forming an inductive half bridge. This is supplemented in the carrier frequency
amplifier connected to form a full bridge.
The displacement measuring range covers both directions, starting from the
zero position up to the nominal (rated) displacement. By moving the plunger,
the inductance values of the two coils are changed. The difference in induc
tance is a measure of the displacement.
9
W1ELA
HBMA2621−10.en/de
4 Instruction for mounting
The centerlines of the sensor body and the plunger must be aligned exactly in
the direction of the displacement to be measured. Lateral movements should
be avoided. Because of the open construction of the sensor it is possible to
look into the core channel for centering the plunger.
All types can be clamped on the sensor body (diameter 12h8).
The plunger is screwed onto the object to be measured using its threaded
section. The thread is designed as a precision thread, permitting correct posi
tioning of the plunger. Two nuts provide fixing and locking.
Fixing the sensor body
Use the W/ZB12 mounting block for fixing the sensor. With long sensors you
will possibly have to use two mounting blocks.
Prior to fitting the plunger, connect the sensor body to the amplifier and make
the zero balance (see chapter 6 or the resp. amplifier’s operating manual).
The displacement measuring range should not lie outside the nominal (rated)
measuring span, which extends symmetrically on both sides of the plunger’s
center position.
30
20
4.5
1
12.2
36.5
7.5
M4
7.5
17.5
8.75
27
7.5
Mounting example 2Mounting example 1 Mounting example 3
WS/ZB12
2 mounting blocks with countersink Km4 DIN 74
1 mounting block with thread M4
4 fillisterhead screws M4x25, DIN 912
2 fillisterhead screws M4x40, DIN 912
1 hexagonalhead bolt spanner a.f. 3
Fig.4.1: Mounting examples
10 W1ELA
HBM A2621−1.0en/de
5 Electrical connection
With the core inserted, there will be a positive unbalance in the bridge (insert
in the direction of the connection strands, see Fig.1.1). With the core extrac
ted, there will be a negative unbalance in the bridge. In the middle of the mea
suring range the output voltage is zero.
Connection Extension
WH (white) Measuring signal (+)
BU (blue) Bridge excitation voltage (+)
GN (green) Sensor circuit (+)
BK (black) Bridge excitation voltage (−)
GY (grey) Sensor circuit (−)
Cable shield Sensor housing
0+
Fig.5.1: Connection, 3−wire and 5−wire extension
To obtain a small size, the sensor has not been fitted with integrated sensor
circuits for operation in six−wire circuit. For operation with a six−wire amplifier,
the feedback inputs must be connected to the appropriate bridge excitation li
nes.
The factory calibration allows for the effect of the permanently mounted four−
wire cable.
Cables of up to 100 m length have no noticeable effect on the sensitivity. Up
to 600 m this effect is generally lower than 5 %. lt can be compensated by di
rect calibration of the measuring system. The sensor cable should therefore
be connected from the outset at the length envisaged for measurement opera
tions.
Table of contents
Languages:
Other HBM Accessories manuals
