Transcript hydraulic cylinder position sensing technology

Page 1
HYDRAULIC CYLINDER POSITION SENSING TECHNOLOGY
Patent applied for technology allows our
externally mounted linear transducer to
read through standard carbon steel cylinder walls over 25 mm (1”) thick.

Magnet Assembly
Smart cylinder machining costs reduced by up to 70%


Product features
External Transducer
No deep hole / gun drilling needed
No end cap machining needed
 reduced
Easy &byquick
access to linear transducer
Smart cylinder machining costs
up to 70%.
simply mounted to outside of cylinder
• No deep hole / gun drilling needed
• No end cap machining needed
Easy servicing of the cylinder or sensor
Easy & quick access to linear transducer simply mounted to outside of cylinder

One, two or even three linear transducers can
• Easy servicing of the cylinder or sensor
be mounted to one cylinder
One, two or even three linear transducers
can be
to one cylinder

Useful
formounted
critical applications
• Useful for critical applications 
The transducer is removed from hydraulic pressure
spikespressure
or the highest
oil temperature
• The transducer is removed from hydraulic
spikes hydraulic
or the highest
hydraulic oil temperature
Ideal for small cylinders where
difficult
to fit. where transducers
 transducers
Ideal for are
small
cylinders
• The piston rod is not weakened
by
deep
hole
drilling
are difficult to fit.
Excellent for long cylinders

The piston rod is not weakened by deep hole drilling
Great for piston accumulators

Excellent for long cylinders
• No added nitrogen seal leakage problems

Great
for piston
accumulators
Finally a linear transducer solution
for steering
cylinders


No added nitrogen seal leakage problems
Finally a linear transducer solution for steering
cylinders
ELINTRO.02.01
Adress: Enebybergsvägen 10 B
182 36 Danderyd, Sweden
Tel: +46 (0)8 - 756 72 20
Fax: +46 (0)8 - 756 76 80
Adress: Malmgatan 9
265 38 Åstorp, Sweden
Tel: +46 (0)703 - 44 04 95
Rota
Engineering
Limited
Adress: Ljungberghsgatan 1
568 30 Skillingaryd, Sweden
Tel: +44(0)161
Tel: +46 (0)702
- 01 08 18
Wellington Street
Bury, Manchester,
U.K BL8 2BD
764 0424
Fax: +44(0)161 762 9729
e-mail: [email protected]
Web: www.rota-eng.com
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How does it work?
A special magnet assembly is simply inserted into the piston head, as the piston is moved by the hydraulic fluid, the externally fitted linear transducer measures the piston stroke.
How Is It Installed?
1. The piston head has a simple slot milled next to the seals/wear rings
2. The magnet assembly is placed in the slot
3. The cylinder is then assembled as normal
4. The linear transducer(s) is mounted to simple welded brackets pre-installed on the cylinder and retained by set screw etc
5. The transducer is connected electrically and automatically reads the piston stroke position
Sensor Attributes
The ELA external linear transducer is based on rota’s well proven extremely compact Internal cylinder sensor; using hall
effect technology with the following features:

• Ruggedised design for extreme environments
• Solid state electronics
• Proven pedigree in high shock and vibration applications
• Absolute signal
• Digital and analog outputs
• 5-12, 9-32 Volt supply
• High temperature rating
• Long stroke length
• I.P. 67 rating
Magnet Attributes
The ELA permanent magnet assembly is suitable for operating temperatures of –40o to 120oc (-40o to 250of) and hydraulic pressures of 600 bar (9000 psi)
Adress: Enebybergsvägen 10 B
182 36 Danderyd, Sweden
Tel: +46 (0)8 - 756 72 20
Fax: +46 (0)8 - 756 76 80
Adress: Malmgatan 9
265 38 Åstorp, Sweden
Tel: +46 (0)703 - 44 04 95
Adress: Ljungberghsgatan 1
568 30 Skillingaryd, Sweden
Tel: +46 (0)702 - 01 08 18
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ELA Standard Performance Data
Resolution incl. ripple
<0.5mm (0.02”) - any length - dependant on cylinder wall thickness
Stroke
Up to 10metres (33 feet)
Operating Temp. Magnet
-40°C to + 120°C
Operating Temp. Sensor
-40°C to + 105°C
Surge Protection
Tranzorb Protection Diode (BS EN 61000-4-5 Compliant)
Short Circuit Protection
L, F, G, V, H & A types protected to maximum input voltage
Electrical Protection
L, F, G, V, H & A types fully protected against incorrect connection (all wires) to maximum input voltage
Insulation Resistance
>1000MΩ @ 1000VDC
Analogue Outputs
0.5 – 4.5V
0.25 – 4.75V
0.5 – 4.5V
0.5 – 5.0V
0.5 – 10.0V
3wire 4 - 20 mA
Order Code
L
F
G
V
H
A**
Input Voltage
5 – 12 V
9 – 32 V
9 – 32 V
9 – 32 V
13 – 32 V
13 – 32 V
±90ppm/°C
(±0.005%/°F)
±70ppm/°C
(±0.004%/°F)
Temperature Co-efficient
±40ppm/°C (±0.002%/°F)
Current Consumption
12 mA
Digital Outputs
Order Code
P (1, 2, etc)
Input Voltage
Terminal Order
WIRING DETAILS
15 mA + Signal
P. W. M.
9 – 32 V
Code
W
T
M
Input
Red
Red
1
Common
Black
Black
3
Signal
White
White
2
*Consult TR Electronic for higher accuracy
**Output signal type “A” designed for a 24V Input, 500ohm load. For other input voltages and load resistances please inform TR Electronic
Environmental Performance
Sensor and Magnet
Pressure Rating
600 Bar (9000 psi)
Sensor
Ingress Protection
IP67 with individual wires
IP67 with cable
IP69K with M12 connector
Aluminium 6082 T6 - - Stainless Steel available
Enclosure
Magnet Installation
Cylinder wall material
Magnet Speed
ST52.3 Hydraulic Tube
Up to 2 metres/second
Note: For specials please contact Technical Department Subject to reasonable modifications due to technical advances.
Adress: Enebybergsvägen 10 B
182 36 Danderyd, Sweden
Tel: +46 (0)8 - 756 72 20
Fax: +46 (0)8 - 756 76 80
Adress: Malmgatan 9
265 38 Åstorp, Sweden
Tel: +46 (0)703 - 44 04 95
Adress: Ljungberghsgatan 1
568 30 Skillingaryd, Sweden
Tel: +46 (0)702 - 01 08 18