Transducer Amplifiers

Enicstra stocks transducer amplifiers — the signal-conditioning devices that take low-level transducer outputs (bridge millivolt from load cells, AC excitation from LVDTs, charge from old-style accelerometers) and convert them to standard process signals (4–20 mA, 0–10 V, digital). Without an appropriate amplifier, raw transducers cannot be read by standard PLC or DCS analog inputs.

Brands carried include HBM amplifiers (Clip AE, AE301, ML series), Vishay Precision Group, Mantracourt, Dataforth SCM5/DSCA, Interface Force amplifiers, RDP Group conditioners, Solartron Metrology, and Phoenix Contact MINI-Analog. Obsolete transducer amplifiers — discontinued HBM ML-series, retired Mantracourt earlier codes, end-of-life Vishay AD-series — are sourced through our supplier network. Each amplifier is bench-tested for power-up and gain function and ships with a 12-month functional warranty.

For an obsolete transducer amplifier, send the OEM part number for a quote within 1–2 business days.

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Transducer Amplifiers

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Buying guide

Choosing Transducer Amplifiers components

Transducer amplifier selection comes down to the transducer technology being conditioned, the gain and excitation requirements, the output signal needed, and any calibration sharing requirements between amplifier and transducer. An amplifier matched to a load cell with 2 mV/V sensitivity is not suitable for an LVDT requiring AC excitation, and vice versa.

Specs to confirm before ordering:

Transducer technology to be conditioned: strain-gauge bridge (DC excitation, mV output), LVDT (AC excitation, AC output), thermocouple/RTD (small voltage or resistance change), charge accelerometer, IEPE accelerometer (constant-current excitation)
Excitation voltage provided by the amplifier: 5 V or 10 V DC for bridge, 1–10 kHz AC for LVDT, constant 4 mA for IEPE
Gain range and adjustability — affects the system's effective range
Output: 4–20 mA (most industrial), 0–10 V, ±10 V (signed for bidirectional measurement), digital RS-485/Ethernet
Input filtering and frequency response — important for high-frequency vibration vs. slow process measurements
Number of channels — single, dual, or multi-channel rack systems
Calibration method: front-panel pots, software-configured via USB, or factory-fixed
Power supply: 24 VDC most common, sometimes 120/240 VAC
Mounting: DIN-rail, panel, or 19" rack card

Common gotchas: a 350 Ω bridge load cell and a 1000 Ω bridge produce different millivolt outputs at the same applied force because excitation current differs; amplifiers calibrated for one bridge resistance need re-calibration for the other. LVDT amplifiers must match the LVDT's excitation frequency and sensing-coil configuration; using a generic AC amplifier rarely works. IEPE accelerometer power and signal share one coaxial cable with a coupling capacitor that blocks the 24 V bias and passes the AC signal; standard amplifiers without IEPE current source give no useful reading. Charge amplifiers for older piezoelectric accelerometers are different from IEPE — charge mode uses two-conductor cable; IEPE uses coax.

Typical applications: load-cell weighing systems, force monitoring on press tonnage, LVDT-based displacement feedback in measuring fixtures, vibration monitoring on rotating equipment, and bridge-based torque measurement on test stands. On legacy installations, exact-OEM amplifier replacement preserves the calibration tied to the matched transducer.

For obsolete transducer amplifiers, send the OEM part number for a sourcing quote.

Related categories Frequently asked questions

Do you stock obsolete transducer amplifiers?

Yes. Discontinued HBM ML-series amplifiers, retired Mantracourt early codes, end-of-life Vishay AD-series, and earlier Dataforth DSCA modules are sourced through our supplier network.

Why doesn't my load cell read on the PLC?

Most likely the load cell outputs raw bridge millivolts that the PLC analog input cannot read directly. Add a load-cell amplifier between the cell and the PLC — it converts the 0–20 mV signal to 4–20 mA or 0–10 V.

Can one amplifier read any transducer?

No. Amplifiers are technology-specific: strain-gauge bridge amplifiers do not condition LVDT signals; LVDT conditioners do not work for thermocouples; IEPE inputs do not work for charge accelerometers. Match the amplifier to the transducer technology.

Does the calibration transfer with a replacement amplifier?

If the model and firmware match, calibration can be re-entered from the original specification. Across model generations, calibration usually needs to be redone with a known reference (or factory recalibration of the matched transducer + amplifier set).

Can I tune the gain in the field?

Most amplifiers have either front-panel adjustment pots or software-based gain configuration. For best accuracy, calibrate against a known reference at the operating range — pot adjustment by feel alone gives unreliable results.

What is the warranty?

12-month functional warranty. Damage from over-voltage on transducer inputs, miswiring, or operation outside rated environment is not covered.