I. Model Analysis

7203953: Unique material code for the 3500/40M module

‑01: Standard version (standard temperature, standard firmware, no special customization)

Alias: 3500/40M (market common model)

Position: Pure electric eddy current signal input (only suitable for displacement type probes), different from 3500/42M which can be connected to vibration probes.

II. Core Functions and Applications

Function: Receives signals from 4 eddy current probes (3300XL/7200 series), channel pair configuration (1&2 as one group, 3&4 as another group), capable of monitoring:

Radial vibration (shaft vibration)

Axial displacement (thrust)

Temperature difference (Differential Expansion)

Offset, REBAM (rolling bearing vibration)

Output: Each channel -24 to 0 VDC gap voltage; 4 channels for alarms + 2 channels for dangerous relay contacts; no 4-20mA analog quantity (only 7203954-01 has it).

Application: Critical rotating machinery TSI protection for steam turbines, gas turbines, compressors, etc., focusing on displacement parameter monitoring.

Companion: Compatible with **330104 (8mm), 330106 (11mm), 72072-01 (14mm)** and other probes.

III. Key Technical Parameters

Channels: 4 channels (pair configuration)

Input: Eddy current probes, -10 to +10 VDC

Sensitivity: 7.87 mV/μm (200 mV/mil, compatible with 14mm probes)

Linear range: 2.54 mm (100 mil) per channel

Accuracy: ±0.2% FS

Power consumption: 5.5W (‑24VDC power supply)

Operating temperature: -40℃ to +85℃

Structure: Full-height card, 3500/05 rack installation, supports hot swapping

Configuration: 3500 rack software programming, independent channel alarms.

IV. Core Differences from 3500/42M (7203954-01) Table

Comparison item7203953-01 (3500/40M)7203954-01 (3500/42M)

Input typeOnly eddy current probe (displacement)Eddy current + velocity/acceleration probe (vibration + displacement)

4-20mA output❌ None✅ Standard for each channel

Monitoring functionDisplacement, shaft misalignment, eccentricity vibration, displacement, shaft misalignment, eccentricity, acceleration, velocity

PriceLowerHigher

Application scenariosPure displacement monitoring (for retrofit of old units)Full parameter monitoring of vibration + displacement (for new projects)

V. Replacement and Compatibility

Direct replacement: 3500/40M (7203953-01), available in new or used condition.

Downward compatibility: Can replace 7200 series 72052-01, 72059-01R, etc. Requires reconfiguration.

Upgrade recommendation: When monitoring vibration + displacement simultaneously, prefer 3500/42M (7203954-01).