Basic Information

Original American-made 3500 system-specific monitoring card, half-height size, supports hot-swappable power-on; metal reinforced housing, compliant with API 670 standard, specially designed for shell expansion (cylinder expansion), differential expansion, and axial position monitoring of critical rotating machinery such as steam turbines, with industrial-grade high reliability, compatible with 3500/05 framework.

Function and Positioning

4-channel independent monitoring, receiving input from LVDT/RPT/electro-enthusiast sensors, accurately measuring the thermal expansion of the steam turbine shell, also measuring differential expansion, axial displacement, and valve position; providing alarm/danger relay outputs, real-time over-limit protection to prevent dynamic and static friction of the unit, supporting thermal state trend analysis and fault diagnosis.

Core Performance Parameters

Channels: 4 isolated (Channel 3/4 are dedicated to cylinder expansion)

Inputs: LVDT/RPT/electro-enthusiast sensors (compatible with 3300 series)

Measurements: Shell expansion, differential expansion, axial position, valve position

Outputs: 4–20mA analog quantity, relay contacts (alarm/danger) Power supply: 24V DC

Power consumption: ≤ 18W

Operating temperature: -20℃ to +60℃

Compatible accessories

LVDT/RPT position probe, 3500/20 frame interface module, 3500 frame, dedicated signal cable, terminal block. Applicable scenarios

The shell expansion (cylinder expansion), differential expansion and axial displacement protection of steam turbines, gas turbines, large compressors and generators are the core monitoring cards for the thermal safety operation of the power plant.