LVDT Signal Conditioning

LVDT Signal Conditioning Application Notes. Would you like to discuss an application? Call us today 856-727-0250

LVDT signal conditioner S1A Series solves the susceptibility to beat frequency interference between channels.

GE Gas Turbine LVDTs with an ASG S1A LVDT Signal Conditioner

By: Ed Herceg Chief Technology Officer

The Alliance Sensors Group model S1A module is the most advanced single channel LVDT signal conditioner available today. It will operate practically any LVDT currently on the market, but occasionally users can be confused by unusual LVDT configurations,

ASG LVDT signal conditioner using its RS-485 communication port

ASG LVDT Signal Conditioning modules Graphic User Interface (GUI) Instructions

1. Connect a 2-wire RS-485 port converter to the computer on which this GUI is to run and connect the converter's output terminals to the RS-485 bus connections on the LVDT module(s), Data A (D-) connects to terminal J3-2 and Data B (D+) connects to terminal J3-1, but always follow the data polarity (D) indicated above, regardless of the letters used for the data lines.

Specific differences between ASG's S2A and SC-200 LVDT signal conditioner modules

The S2A and SC-200 LVDT signal conditioners are very similar; however, each unit was designed with specific features for the markets it serves in mind, so there are a few differences between them.

Recommendations for DC power supplies and USB-based data acquisition hardware for use with ASG's signal conditioners and DC-operated sensors

DC Power Supplies

There are two distinct types of DC power supplies that convert the AC power line voltage into
DC voltage to operate electronic devices. Linear supplies use a transformer, rectifier diodes, a
regulator, and filtering to produce relatively clean DC, but they are limited to a narrow range of
power input voltages and are usually physically large. Switching supplies offer a wider range
of power input voltages and are usually smaller in size, but often have switching frequency

How to Use the Failure Warning Output at J2-2 of an ASG S1A LVDT Signal Conditioner

The S1A LVDT signal conditioner module offers an open-collector failure warning output signal which is available at J2-2 on the blue terminal block connector. This output is a connection to the collector of an internal transistor switch, whose factory default mode of operation is Normally Open (NO). In NO mode a device connected between the +24 V DC supply and J2-2 will have no current flow when the module is operating without error, producing a logic High (+24 V) at J2-2, but if a failure occurs, current will flow producing a logic Low (0) at J2-2.

Hot Swapping S1A LVDT Signal Conditioning Modules

Under the right conditions, an S1A module can be "hot swapped" with another module having the same internal DIP switch settings and loaded with values in certain EEPROM locations that match those in the original module. If S1As are connected in a multi-module array, this process will take the selected module off-line, but if done carefully, will allow the remaining modules in the array to operate normally.

To prepare the replacement module for a hot swap, the configuration data of the original module, which should have been obtained previously and saved for a possible hot swap, is needed. If this data is not available, connect to the RS-485 port of the original module with a PC and terminal program, and use the Config command to get it. Using that data, set the internal DIP switches and jumpers of the new module to match, then power it up and use its RS-485 port as noted above to load the values of ADC HI, ADC Lo, In Pot, Gain, and, if needed, FOP, FD, and LF using the Set command for each value.

LVDT Signal Conditioner DIN Rail Mounted S2A Series

Alliance Sensors Group's model S2A DIN-rail-mounting LVDT signal conditioner is designed specifically for the power generation industry. It offers comprehensive diagnostics for sensor or wiring failure, real time recalibration of the Full Span and Zero outputs, enhanced ground loop noise rejection, and backward compatibility to legacy S1A signal conditioners. Utilizing front panel push buttons for easy calibration, the S2A is engineered to work with the widest range of LVDT, RVDT, and inductive half-bridge LVRT sensors by providing four excitation frequencies that will operate most AC-LVDTs over a 50 to 5,000 mVrms range of sensor ...

Alliance Sensors Group's SC-200 DIN-rail-mounting LVDT signal conditioner for industrial measuring systems, testing laboratories, and factory automation offers push buttons for fast and easy calibration of the Full Sale and Zero outputs, differiential input to minimize ground loop noise, and color-coded screw terminal plugs for quick hook up. The SC-200 is engineered to work with a very wide range of LVDT, RVDT, and inductive half-bridge (LVRT) sensors by providing four excitation frequencies that operate most AC-LVDTs over a 50 to 5,00 mVrms range of sensor output. SC-200 modules offer a choice of 8 analog outputs and half-duplex RS-485 digital comm port ...

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