Omega Products LD400-2.5 User Manual
MINIATURE DC OUTPUT LVDT
DISPLACEMENT TRANSDUCERS
WITH ACETAL BEARINGS
±1 to ±5 mm
(±0.04 to ±0.20")
LD400 Series
U High-Output Miniature
Transducers
U Acetal Bearings for
Precise Motion
U Infinite Resolution
U Rugged, Low-Mass
Construction
U Compatible with
Standard DC
Signal
U Conditioning
Modules
and Instruments
The LD400 Series miniature
DC to DC transducers can
measure displacements up to
±5 mm (±0.20") with very high
accuracy and infinite resolution.
Their free-guided armature
incorporates acetal bearings, which
provide near-frictionless motion
to detect the smallest movement
the associated instrumentation is
capable of identifying.
These transducers use a precision
linear variable differential
transformer as the measuring
source, along with hybrid ICs,
including an oscillator, demodulator,
and filter. Together, they make up
a self-contained unit that accepts
DC input and provides DC output
relative to armature position.
The unit’s high linearity and low
mass of moving parts are ideal for
applications in civil, mechanical,
chemical, and production
engineering.
SPECIFICATIONS
ELECTRICAL
Linearity: 0.3% FS
Sensitivity: (mV/V/mm) see chart below
(actual output supplied with each unit)
Excitation: 10 to 24 Vdc regulated
Energizing Current at 10 Vdc:
LD400-1, 10 mA; LD400-25, 10 mA;
LD400-5, 13 mA
Response Time: LD400-1 and
LD400-2.5 = 5 ms; LD400-5 = 3 ms
Frequency Response: 50 Hz for -3 dB
Ripple: <1% FS
Thermal Effect: Zero: LD400-1 <0.02%
FS/°C; LD400-2.5 and LD400-5 <0.01%
FC/°C; sensitivity: <0.025% FC/°C
Compensated Temperature Range:
-20 to 80°C (-4 to 176°F)
Operating Temperature Range:
-20 to 80°C (-4 to 176°F)
To Order Visit omega.com/ld400 for Pricing and Details
MODEL NO.
LD400-1 ±1.0 mm (0.06") 75 mV/V/mm DP41-S, DP25B-S
LD400-2.5 ±2.5 mm (0.10") 75 mV/V/mm DP41-S, DP25B-S
LD400-5 ±5.0 mm (0.20") 54 mV/V/mm DP41-S, DP25B-S
Ordering Example: LD400-5, stroke of ±5 mm.
STROKE
SENSITIVITY COMPATIBLE METERS
LD400-5, shown
actual size.
Electrical Connection: 2.9 m (9')
shielded, color-coded cable
Sensitivity and Linearity Data:
Provided with a transducer output
impedance of 2.4 kΩ into a calibration
load of 20 kΩ at 20°C (68°F); variations
in these parameters will change
performance
MECHANICAL
Threaded Core: M2 thread
Core Material: Ni/Fe—Radio Metal 50
Case Material:
400 Series stainless steel
Weight: See chart on next page
CONNECTIONS
Electrical Connections:
Red: + Excitation
Blue: – Excitation
White: + Signal*
Green: – Signal
Yellow: No connection
White and red in phase for positive
*
inward displacement.
J-11
MINIATURE DC DISPLACEMENT TRANSDUCERS
LD400 LINE ART
3
(0.12)
DP25B-S.
B
19 (0.75)
DP41-S.
Both meters shown slightly
smaller than actual size.
LD400-5, shown
actual size.
COMPATIBLE INSTRUMENTS, VISIT OMEGA.COM
MODEL NO. DESCRIPTION
DP25B-S Ratiometric voltage and current input meter with excitation
DP41-S 115 Vac powered strain gage indicator
A
(0.14) CABLE
3.5
M2X6
6.0
(0.24)
10
(0.39)
Dimensions: mm (inch)
1 (0.04)
1.9
(0.074)
DISPLACEMENT
J
CORE
ASSEMBLY
Wiring :
Red = + Supply
Blue = - Supply
White = + Signal
Green = - Signal
Yellow = N/A
MODEL NO. mm (inch) A B BODY CORE (GUIDED)
LD400-1 ±1.0 (0.04) 21.5 (0.85) 37 (1.46) 26 (1.02) 1.0 (0.04)
LD400-2.5 ±2.5 (0.10) 21.5 (0.85) 37 (1.46) 26 (1.02) 1.0 (0.04)
LD400-5 ±5.0 (0.20) 20.5 (0.81) 43 (1.69) 30 (1.18) 1.2 (0.04)
* At electrical zero.
LINEAR STROKE DIMENSIONS*: mm (inch) WEIGHT g (oz)
J-12
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