CON021/916-160 (EPRO/Emerson eddy current preamplifier)

CON021/916-160 is an eddy current sensor preamplifier from EPRO (now part of Emerson), designed to be used with the PR6423/PR6424/PR6426 series probes. It is used for shaft vibration, axial displacement, eccentricity, speed / phase alignment measurement, and is the core signal conversion unit of the TSI system. 

Model Disassembly

CON021: Standard Type Eddy Current Preamplifier Series

916: Extended Range Series (91x = Extended, 90x = Standard)

160: 16mm Range (Air Gap Measurement Range)

Core function

Provide high-frequency excitation for the eddy current probe to detect changes in the gap between the probe and the shaft surface.

Convert the original signal of the probe into a standard analog quantity of **-4 to -20VDC**, which is collected by the TSI card.

Built-in linearization and temperature compensation ensure long-term stability in industrial environments.

Single-ended output, compatible with the MMS6000/MMS3000 system and third-party DCS. Technical Specifications

Adapter probes: PR6423 (φ8mm), PR6424 (φ16mm), PR6426 (φ32mm)

Range: 0 - 16mm (linear range)

Power supply: -23 to -32VDC (typical - 24VDC), ≤ 15mA

Output: -4 to -20VDC (corresponding to 0 - 16mm)

Frequency response: 0 - 20kHz (-3dB), suitable for high-speed shaft vibration

Linearity: ≤ ±1% of full scale

Temperature: -30℃ to +100℃

Protection: IP65, industrial-grade shock and moisture resistance

Cable: Standard 5 meters (customizable), coaxial shielded, both ends LEMO plugs

Weight: Approximately 120g, aluminum alloy housing

Typical pairing (TSI system)

Probe + Preamplifier: PR6424/xxx-xxx + CON021/916-160 (paired calibration, non-interchangeable)

Monitoring card: MMS6210 (shaft vibration), MMS6310 (axial displacement)

Communication gateway: MMS6823R (data upload to DCS)

Configuration software: MMS6910 (range / alarm value setting)

Installation and pairing tips

Paired calibration: The probe and preamplifier are uniquely matched at factory, mixed pairing will cause serious errors

Gap setting: Static gap set to 8mm (midpoint of the range), output approximately -12VDC

Installation distance: Preamplifier to probe ≤ 5 meters, avoid signal attenuation

Shielding grounding: Cable shielding layer grounded at one end in the cabinet, away from frequency converter / strong electric interference

Non-explosion-proof: 916 series cannot be used in explosion-proof areas, hazardous environments need to select 92x series