This range of low cost
linear position transducers will provide measurement of the movement of a valve, actuator, damper, or any
other moving device,
and provide a current, voltage or resistive feedback signal proportional to position.
The transmitter uses a potentiometer as the variable element. A coated steel wire is wound onto a
pulley wheel with a constant force spring arrangement for cord retraction. The
construction provides a measure of damping if the anchor point of the wire is
subject to vibration, and obviates mechanical wear if the motion is out of line
with the potentiometer. It is very simple to fit. Bolt the case to
the static element and hook the cord end on to the moving element.
Standard
Features
-
Constant force return spring even up to the longest pull version.
-
Ceramic brush for the cord exit to reduce wear, miss-alignment of cord up to 30
degree.
-
Rolling bearings on
internal component to extend life and decrease stiction (except low
cost OEM position transducer).
-
3 wire potentiometric (1 kOhm standard, other
values available).
-
Nylon coated S/Steel pull cord.
Options
-
Alternative pull cord materials, e.g. braided stainless steel, Kevlar.
-
Pull cord extensions for mounting at a
distance form the subject.
-
Various end fittings can be
supplied, e.g. split ring, snap link, anti-rotation swivel.
-
Electrical plug and socket can be supplied.
-
Armoured cable for harsh environments.
-
Custom brackets and pulleys to suit client's application
(we will design to your needs).
-
Non-standard pull lengths.
-
Integral 4-20 mA 2-wire
transmitter, or 0-10 V 3-wire transmitter.
-
The transmitter versions have span and zero calibration adjustments built in.
-
The transmitter electronics are also available as a stand-alone device to bring
the span and zero adjustments to a convenient location away from the linear
displacement transducer,
e.g. in a safe area.
| Nominal travel (mm) |
35 |
75 |
150 |
300 |
500 |
1000 |
1250 |
Potentiometer type
CP = Conductive Plastic
WW = Wire Wound |
CP |
CP |
WW |
WW |
WW |
WW |
WW |
| Standard Resistance overall |
1K |
1K |
1K |
1K |
1K |
1K |
1K |
| Linearity better than (%) |
2 |
2 |
1 |
1 |
1 |
1 |
1 |
| Repeatability (typical)(%) |
0.1 |
0.1 |
0.1 |
0.1 |
0.1 |
0.1 |
0.1 |
Standard
Industrial Linear Potentiometer
Available as: 3 wire potentiometric or 2 wire 4-20mA current loop, 3 wire 0-10V,
both with adjustable Span and Zero.
Measuring ranges: from 35mm to 1250mm.
Size (mm): 140 long (inc. feet), 65 wide, 56 high.
Sealed to IP55.
Shown
with 2 wire 4-20mA current loop and armoured cable.
Shown with 2 wire 4-20mA current loop, nylon coated
stainless steel cord with split ring connector and optional plug & socket
electrical connector.
Industrial
Linear Potentiometer - Extended Stroke
Available as: 3 wire potentiometric or 2 wire 4-20mA
current loop, 3 wire 0-10v, both with adjustable Span and Zero.
Measuring ranges: from 1300mm to 1650mm.
Size (mm): 170 long (inc. feet), 102 wide, 76 high.
Sealed to IP55.
Shown with 3 wire potentiometer, nylon coated stainless steel cord with split
ring connector and standard PVC electrical cable.
Industrial
Linear Potentiometer - Long Stroke
Available as: 3 wire potentiometric
or 2 wire 4-20mA current loop and 3 wire 0-10v, both with adjustable Span and Zero.
Measuring ranges: from 1500mm to 5000mm (to 10000mm in larger case).
Size (mm): 222 long (inc. feet), 122 wide, 56 high, (106 larger case).
Sealed to IP55.
Shown with 2 wire 4-20mA, nylon coated stainless steel cord with latched hook
connector and standard PVC electrical cable. Shown with clear display lid.
Low Cost OEM Active Open Frame Linear Potentiometer
Available as: 2 wire
current loop and 3 wire 0-10v, both with adjustable Span and Zero.
Measuring ranges: from 20mm to 800mm.Size (mm): 100 long, 52 wide, 52
high.
Shown with Kevlar non-kink cord and latched hook connector.
NOTE: Minimum order quantity applies
for OEM models.
Low Cost OEM Passive Open Frame
Linear Potentiometer
Available as: 3
wire
potentiometric.
Measuring ranges: from 20mm to
800mm.
Size (mm): 90 long, 52 wide, 52 high.
Shown with stranded stainless steel cord and latched hook connector.
NOTE: Minimum order quantity applies
for OEM models.
Consultation, Design and Build - Control and Instrumentation
