Line distance transducer - way of operation, review of available types

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A Cable-Extension Transducer, sometimes also known as a string pot, a draw wire senor, a string encoder or a yo yo pot, is a device used to detect and measure linear position and velocity using a flexible cable and a spring-loaded spool. Simply mount the transducer's body to a fixed surface and attach the stainless steel cable to the movable object. As the object moves, the transducer produces an electrical signal that is proportaional to the cable's linear extension or velocity. This signal can then be sent to a display, a PLC or data aquisition system
Cable-Exension Tranducers (CETs) are composed of four main parts:
Measuring Cable Spool Spring Rotational Sensor
Measuring the movement and position of objects is easy with CETs. CETs can be installed in minutes, fitted into prcarous or tight areas and they do not require perfectly parallel alignment. They also offer great flexibility, a small size to measurement ratio and they cost less than rod or wand-type measurement devices. CETs can be used in a wide variety of applications including industrial factory automation, high-tech medical devices, structural and automotive testing, die-casting or injection molding, hydraulic cylinder control or just about anything else you can think of...

Celesco offers all industry-standard output signals, these include:

Potentiometric (Voltage Divider)
0...10 Volts DC
4...20 mA (2-wire)
0...20 mA (3-wire)
Incremental Encoder (Quadrature)
Absolute Encoder (ask factory)
RS232/RS422 Communications
DeviceNET®
CANbus J1939

Measuring the movement and position of objects is easy with CETs.

CETs can be installed in minutes, fitted into prcarous or tight areas and they do not require perfectly parallel alignment. They also offer great flexibility, a small size to measurement ratio and they cost less than rod or wand-type measurement devices.

CETs can be used in a wide variety of applications including industrial factory automation, high-tech medical devices, structural and automotive testing, die-casting or injection molding, hydraulic cylinder control or just about anything else you can think of...

Group MTAMT2SPPT1SZG65PT100

Compact group (DO 2500 mm)
I/O

Technical data
Measurement range [mm]	125	750	1250	1250	1250	2500
Accuracy	0,15%	0,25...0,02%	1,00...0,25%	0,28...0,02%	0,02%	0,28...0,02%
Repeatability	0,02%	0,02%	0,05%	0,05...0,02%	0,02%	0,05...0,02%

Technical data
Casing material	Anode Aluminium	Anode Aluminium	Plastic (polycarbonate)	Anode Aluminium /ABS	Anode Aluminium	Anode Aluminium
Protection level	IP65	IP50	IP50	IP65...67 depends on execution	IP65	IP50
Casing
Noble steel covered with nylon	•	•	•	•	-	•
Noble steel	-	-	-	-	-	-
Thermoelastic plastic	-	-	-	-	-	-

Measurement cord
Potentiometer	•	•	•	•	-	•
Tachometer	-	-	-	-	-	-
0...10VDC	-	-	-	•	-	•
4-20 mA	-	-	-	•	-	•
Incremental encoder	-	•	•	•	•	•
RS 232	-	-	-	•	-	-
CAN Bus	-	-	-	•	-	-
Devicenet	-	-	-	•	-	-
Absolute encoder	-	-	-	-	(•)	-

Electric connection
Cable for soldering	-	•	•	-	-	-
Wires	•	-	-	-	-	-
Cable for devices	•	•	•	•	(•)	•
Plug	-	•	-	•	•	•

Properties
Preferences	-	-	-	Protection against recoil	-	-
Typical application	Measurements in limited area	Measurements with high acceleration	Universal, resistant from axe shifts and free cord lose.	Mechanical materials or vehicles tests without high acceleration.	Elevators, Vehicles, Platforms	Mechanical tests in laboratories

Group PT5PT8000SZG81SZG122PT9000PT9000er

Group for industrial applications(DO 42500 mm)


technical data
Measurement range [mm]	6250	1500	6250	4300	13750	42500
Accuracy	0,28...0,02%	0,28...0,02%	0,02%	0,02%	0,12...0,02%	0,05...0,02%
Repeatability	0,05...0,02%	0,05...0,02%	0,02% 0,02%	0,05...0,02%	0,05...0,02%

Technical data
Casing material	Anode Aluminium	Powder painted aluminium or noble steel	Anode Aluminium	Anode Aluminium	Covered aluminium or noble steel	Covered aluminium or noble steel
Protection level	IP65...67*	IP65...68*	IP65	IP65	IP65...68*	IP65...67*
* Depends on solution

Casing
Noble steel covered with nylon.	•	•	•	•	•	•(stal szlachetna przy dużych odległościach pomiarowych)
Noble steel	•	•	-	•	•	-
Thermoelastic plastic	•	•	-	•	•	-

Measurement cord
Potentiometer	•	•	•	•	•	•
Tachometer	•	-	-	-	•	-
0...10VDC	•	•	-	•	•	•
4-20 mA	•	•	-	•	•	•
Incremental encoder	•	•	•	•	•	•
RS 232	•	•	-	•	•	•
CAN Bus	•	•	-	-	•	•
Devicenet	•	•	-	•	•	•
Absolute encoder	-	-	(•)	(•)	-	-

Electrical connections
Cable for devices	•	•	(•)	(•)	•	•
Plug	•	•	•	•	•	•

Properties
Preferences	-	1) different cables lead outs 2) EX version 3) integrated brushes	-	-	1) higher cable withdrawal force 2) EX version 3)brush system 4) cable blockade system	EX version
Typical applications	Difficult applications with high accelerations and big cycles quantity. Reliable models for difficult industrial applications: Elevators, scenes, vehicles ,hydraulic components, telescope applications, applications with big measurement distances.