Mantracourt LVDT, LVDT-D, LVDT-A User Manual
LVDT/A & LVDT/D
Amplifier / Signal Conditioner
User Manual
MICRON METERS
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Mantracourt Electronics Limited LVDT/A & LVDT/D User Manual
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LVDT/A & LVDT/D Manual
Contents
Chapter 1 The LVDT Conditioner ..................................................................................................... 1
Chapter 2 Installing the LVDT/A & LVDT/D ......................................................................................... 2
Terminal Connection ..................................................................................................................... 3
Dimensions of the Enclosure and Mounting Holes ................................................................................... 3
Output Connections ...................................................................................................................... 4
Output Current Mode Settings – Jumpers JP1 & JP2 ................................................................................ 5
Chapter 4 Input Calibration ........................................................................................................... 6
Span (gain) - SW1 (0 = OFF 1 = ON) .................................................................................................. 6
Zero (offset) - SW2 ....................................................................................................................... 7
Excitation Amplitude - SW2/8 .......................................................................................................... 7
The LVDT/A & LVDT/D Filter ........................................................................................................... 7
Filter Cut off - SW3 (0 = OFF 1 = ON) ............................................................................................... 7
Chapter 5 Specification for LVDT/A & LVDT/D .................................................................................... 8
W A R R A N T Y .......................................................................................................................... 10
Chapter 1 The LVDT Conditioner
The LVDT provides a wide range of signal conditioning for LVDT transducers.
Offered in two versions, the LVDT/A for 110/240 V AC or 18-24 V DC operation and the LVDT/D which is DC powered
only.
Transducer sensitivities between 20 mV and 10 V are accommodated by a combination of DIL switch settings and a
fine trim potentiometer.
Similar arrangements are provided for any ‘zero’ errors in the transducers and can be used to offset the readings by
up to ±35% of full scale.
A wide frequency response is offered, of typically DC to 200 Hz. There is an on-board low pass filter, which can be
switched in to reduce high frequency fluctuations or induced electrical noise, to give stable readings under adverse
conditions.
A wide range of output options for current, and uni-polar or bi-polar voltage can be configured by DIL switch
settings.
Both the AC and DC versions are based on a common board and are mounted in a light grey ABS case sealed to IP65
standard.
Mantracourt Electronics Limited LVDT/A & LVDT/D User Manual
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Chapter 2 Installing the LVDT/A & LVDT/D
In order to maintain compliance with the EMC Directive 2004/108/EC the following installation recommendations
should be followed.
Inputs:
Analogue
Output:
Use individually screened twisted multipair cable. (e.g. FE 585 - 646)
The pairs should be :
pins 1 & 6
pins 2 & 5
pins 3 & 4
Terminate all screens at pin 1 of the input. The screens should not be
connected at the transducer end of the cables.
Use screened twisted pair cable. (e.g. RS 626-4761)
Terminate screen at pin 1 of the input.
The screen should not be connected at the host port.
Pin 1 of the input should be connected to a good Earth. The Earth connection
should have a cross-sectional area sufficient enough to ensure a low
impedance, in order to attenuate RF interference.
Country
Supplier
Part No
Description
UK
Farnell
148-539
Individually shielded twisted multipair cable (7/0.25mm)- 2 pair
Tinned copper drain. Individually shielded in polyester tape.
Diameter: 4.19 mm
Impedance: 54 Ohms: Capacitance/m: core to core 115 pF & core to
shield 203 pF
UK
Farnell
585-646
Individually shielded twisted multipair cable (7/0.25mm)- 3 pair
Tinned copper drain. Individually shielded in polyester tape.
Diameter: 6.86 mm
Impedance: 62 Ohms: Capacitance/m: core to core 98 pF & core to
shield 180 pF
UK
RS
367-533
Braided shielded twisted multipair cable (7/0.2mm)- 1 pair
Miniature- twin -round Diameter: 4.8 mm
Impedance: 62 Ohms: Capacitance/m: core to core 120 pF & core to
shield 210 pF
Mantracourt Electronics Limited LVDT/A & LVDT/D User Manual
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UNPACKING
Carefully remove the LVDT unit from its packing. Check that the unit is complete and undamaged.
The LVDT/A & LVDT/D units can operated in any industrial environment providing the following limits are not
exceeded
Operating
temperature
-10ºC to +50ºC
Humidity
95% non condensing
Storage temperature
-20ºC to +70ºC
Two power supply options are available
LVDT/A:
220/230 VAC, 50/60 Hz
110/120 VAC, 50/60 Hz
5 W Max.
LVDT/A & LVDT/D:
18-24 V DC, 5 W (approx. 150 mA fully loaded)
Terminal Connection
On the surface mounted versions, connections to the LVDT/A & LVDT/D input/output signal and the power supply
are made via 2.5mm² field terminal blocks.
Cable entry in the cased versions is via glands in the side of the case.
Dimensions of the Enclosure and Mounting Holes
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