Products

Series 240

General Purpose DC LVDTs

The Series 240 DC-DC LVDTs are an integrated package consisting of a precision linear variable differential transformer, a solid state oscillator, and a phase-sensitive demodulator. The transducer is designed for excellent linearity, infinite resolution, and high sensitivity. Input and output circuits are electrically isolated from each other and from the coil assembly housing, making them usable directly in floating or ground return systems. DC indicators, recorders, and control systems can usually be driven directly by the large DC output. The core, when displaced axially within the coil assembly, produces a voltage change in the output directly proportional to the displacement.

Key Features

  • Ranges from ±0.05” to ±4.0”
  • 6 to 30 VDC Excitation
  • Non-linearity < 0.5%
  • Stainless Steel Construction

SPECIFICATIONS - ELECTRICAL

MODEL NUMBER 0240-0000 0241-0000 0242-0000 0243-0000 0244-0000 0245-0000 0246-0000 0246-00005
WORKING RANGE, ± Inches (mm) 0.050 (1.27) 0.100 (2.54) 0.250 (6.35) 0.500 (12.7) 1.00 (25.4) 2.00 (50.8) 3.00 (76.2) 3.00 (76.2)
MAX. USABLE RANGE, ± Inches (mm) 0.075 (1.78) 0.150 (3.75) 0.375 (9.53) 0.750 (19.1) 1.50 (38.1) 2.75 (69.8) 3.25 (82.5) 4.00 (101)
INPUT, VDC 6.0 Min. to 30 Max. 9.0 Min. to 30 Max.
NOMINAL F.S. OUTPUT, ±VDC with unloaded output
@ 6 VOLT INPUT 1.3 2.4 1.8 3.1 4.6 3.9 3.3 N/A
@ 15 VOLT INPUT 3.4 6.4 4.8 8.3 12.1 10.2 8.7 10
@ 24 VOLT INPUT 5.5 10.4 7.8 13.5 18.7 16.5 14.1 16.3
@ 30 VOLT INPUT 7.0 13.0 9.7 17.0 24.8 20.7 17.7 30.5
INPUT CURRENT 8.3 mA @ 6 Volt input to 52 mA @ 30 Volt input
2 NON-LINEARITY ±0.5% Full Scale Over Total Working Range, ±1.0% Full Scale Over Maximum Usable Range
INTERNAL CARRIER FREQUENCY, Hz 13000 12000 3600 3400 3200 1500 1400 1400
 % RIPPLE, RMS (nominal) 0.7 0.7 0.8 0.8 0.8 1 1 1
 OUTPUT IMPEDANCE, Ohms 2500 3500 5200 5500 5600 5500 5600 5600
 FREQ. RESPONSE (3 dB down), Hz 300 140 115 110 100 110 75 75
TEMPERATURE RANGE -65°F to +250°F (-54°C to +121°C)
RESOLUTION Infinite

NOTES:

  1. Polarity of excitation must be observed for proper function. Reversal will not damage the unit.
  2. Load Impedance of 50 KOhms minimum required for proper operation.
  3. Output polarity will be positive on one side of null, negative on the other side of null.
  4. Transducers are calibrated at 24 VDC.
  5. Blue lead is more positive with respect to the Green lead when the core is moved toward the lead end.

trans-2016-240-block-diagram

DIMENSIONAL DIAGRAM

 

trans-2016-240-dimensional-diagram

SPECIFICATIONS - MECHANICAL

MODEL* LINEAR RANGE BODY LENGTH, A ELECTRICAL CENTER, Ec BODY MASS CORE LENGTH, B EXTENSION LENGTH, E
±Inches (mm) Inches (mm) Inches (mm) Grams Inches (mm) Inches (mm)
0240-0000__  0.05 (1.27)  0.87 (22.1)  0.34 (8.64) 55.8  0.56 (14.2)  1.9 (48.3)
0241-0000__ 0.10 (2.54) 1.12 (28.5) 0.46 (11.7) 59.2 0.75 (19.1) 1.9 (48.3)
0242-0000__ 0.25 (6.35) 3.21 (81.5) 1.44 (36.6) 121.4 1.75 (44.5) 1.9 (48.3)
0243-0000__ 0.50 (12.7) 3.71 (94.2) 1.69 (42.9) 132.2 1.87 (47.5) 2.4 (60.9)
0244-0000__ 1.00 (25.4) 4.71 (120) 2.19 (55.6) 156.2 2.00 (50.8) 3.2 (81.2)
0245-0000__ 2.00 (50.8) 8.21 (209) 3.94 (100) 235.4 3.50 (88.9) 5.2 (132)
0246-0000__ 3.00 (76.2) 10.52 (267) 5.09 (129) 293 3.50 (88.9) 8.4 (213)
0246-00005 4.00 (101.6) 10.52 (267) 5.09 (129) 293 2.00 (50.8) 9.1 (231)

* Model numbers ending with a “_” have multiple core options. All standard units will end with a 0  indicating a core assembly. This core assembly consists of a core brazed to an extension rod that terminates in 1-72 UNF-2A threads. If an option is not selected, option 0 will be provided.

CORE OPTIONS

Core Assembly Ref Fig. 1 Threaded Core Ref Fig. 2
OPTION 0 OPTION 1 OPTION 2 OPTION 3
MODEL C = 0.120*
(3.05mm)
C = 0.099*
(2.51mm)
C = 0.120*
(3.05mm)
C = 0.099*
(2.51mm)
0240-0000_ C004-0000 C004-0001 C005-0002 C005-0003
0241-0000_ C004-0004 C004-0005 C005-0009 C005-0010
0242-0000_ C004-0010 C004-0006 C005-0054 C005-0051
0243-0000_ C004-0011 C004-0007 C005-0035 C005-0023
0244-0000_ C004-0012 C004-0008 C005-0048  C005-0052
0245-0000_ C004-0013 C004-0009 C005-0053  C005-0033
0246-0000_ C004-0014 C004-0015 C005-0053 C005-0033
0246-00005 C004-0057 N/A N/A N/A

The core is constructed from a soft, high permeability iron-nickel alloy. Nonmagnetic stainless steel is used as extension rod material. Core assemblies are sized for use over the maximum working range of the LVDT. The difference between option 0 and 1 is the core outer diameter. Smaller O.D. cores should be considered for applications with some radial movement to prevent contacting the inner diameter of the coils. The smaller core diameter will decrease sensitivity slightly (< 5%).

Options 2 and 3 are cores only, tapped at both ends with 1-72 UNF-2B threads, as shown in Figure 2 of the Dimensional Drawing. These should be used in applications when a separate extension rod is desirable. The difference between option 2 and 3 is the outer diameter.

The model 0246-00005 has only one core assembly available. This unit is designed to operate over the maximum usable stroke of ±4.0 inches (±102mm).

SERIES 240 MODIFIED FOR USE IN HIGH PRESSURE ENVIRONMENTS

The high pressure version of the Series 240 is suitable for operation in nonconductive and noncorrosive fluids or gasses at pressures up to 5000 P.S.I. The vented housing eliminates pressure differentials between the environment and the transducer’s interior, allowing rapid and extreme pressure changes without damage or degradation in performance.

trans-2016-240-high-pressure

Note: All electrical and physical specifications are the same as the standard Series 240 LVDTs 

MODEL*  STROKE, ±INCHES (MM) 
0240-0008_  0.05 (1.27)
0241-0007_  0.10 (2.54)
0242-0006_ 0.25 (6.35)
0243-0009_ 0.50 (12.7)
0244-0014_  1.00 (25.4)
0245-0007_  2.00 (50.8)
0246-0008_  3.00 (76.2)

* Model numbers ending with a “_” have multiple core options. All standard units will end with a 0 indicating a core assembly. This core assembly consists of a core brazed to an extension rod that terminates in 1-72 UNF-2A threads. If an option is not selected, option 0 will be provided. 

SALES OPTIONS

OPTION#  DESCRIPTION 
X0001 Splashproof – protects the unit from washdown environments or outdoor applications by means of an additional washer on the non-lead end. Applies to Models 0242-0000_ through 0246-0000_
X0004 Modify length of the extension rod to user specified length; specify as Dimension E
X0007 Provide maximum non-linearity of ±0.25% full scale
X0010 Cable termination; eight feet of 4 conductor, #22 AWG., PVC cable; temperature range changes to 0°F to 175°F (-17°C to +79°C)
X0011 Provide an offset and scaled output voltage; special connector and mating connector included; used only with load impedances of 1 Megohm or greater; input voltage and scaling parameters must be specified
X0023 Install second brazed extension rod
X0025 Terminate in an integral connector type MS3101A-14S-5P; adaptor for connector has 1.00” O.D.; includes mating connector
X0036 Welded non-lead end for enhanced splashproofing; applies to Models 0242-0000_ through 0246-0000_
X0040 Cable termination – extended temperature range; eight feet of 4 conductor, #22 AWG., Teflon cable; temperature range increased to -65°F to +250°F (-55°C to +121°C)

For more detailed information about these options, please contact the factory. 

OPTION X0025

trans-2016-240-option-x0025

CAD Drawings

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