Product Overview

The EA402 913-402-000-013 (EA402) is a high-precision proximity sensor (displacement probe) engineered for the Vibro-Meter VM600 series and integrated TSI (Turbine Supervisory Instrumentation) platforms. Designed for non-contact measurement of relative vibration and axial shaft position, this sensor is a critical component in protecting high-speed rotating machinery such as steam turbines, gas compressors, and large pumps in power generation and petrochemical sectors. By providing real-time data on shaft displacement, the EA402 allows operators to detect early-stage mechanical fatigue and prevent catastrophic failures, significantly reducing unplanned downtime in harsh industrial environments.

System Configuration & Ordering Logic

The 913-402-000-013 part number represents a specific hardware configuration within the EA402 series. As part of an eddy-current measurement chain, it typically interfaces with an IQS 450 signal conditioner.

• 913-402: Identifies the EA402 sensor base model, known for its high-temperature resistance and chemical stability.

• 000: Specifies the standard probe tip diameter and mounting thread configuration (typically M10 or 3/8-24 UNF depending on the housing selection).

• 013: Indicates the integral cable length and protection sleeve options. The "013" variant is often calibrated for a specific linear range (usually 2 mm) when paired with a standard steel target.

Performance Specifications

Technical FAQs

How do I verify the Gap Voltage for the EA402 system during commissioning?

The Gap Voltage should be measured at the output of the IQS signal conditioner. For a standard 2 mm range, the center of the linear region is typically at -10 VDC. Adjust the probe position until the multimeter confirms the voltage corresponds to the desired physical offset.

Is the EA402 913-402-000-013 compatible with third-party signal conditioners?

No. To maintain E-E-A-T standards for safety and accuracy, this proximity probe must be used with the designated IQS 450 or IQS 900 series conditioners. Using non-native conditioners will result in non-linear data and void hazardous area certifications.

What is the primary cause of signal drift in these sensors?

Signal drift is usually caused by "cross-talk" from adjacent probes or improper grounding of the integral cable shield. Ensure a minimum lateral spacing of 40 mm between probe tips to prevent electromagnetic interference.

Installation & Field Engineering Guide

• Gap Calibration (The -10V Rule): During installation, the mechanical gap must be set precisely. For most industrial turbines, rotating the probe until it touches the shaft and then backing it out by approximately 1.25 mm will place the output in the linear range. Always verify this with a digital voltmeter (DVM) to ensure a reading of -10 VDC (+/- 0.5 V) at the quiescent state.

• Cable Protection: The integral cable of the 913-402-000-013 uses a specialized FEP jacket. When routing through the bearing pedestal, use flexible stainless steel conduits to prevent damage from hot oil and mechanical abrasion. Ensure a minimum bend radius of 25 mm.

• Tightening Torque: Over-tightening the locknut can deform the probe body. Use a maximum torque of 15 Nm for M10 threads to ensure stability without compromising the internal ceramic components.

Operational Advantages

The EA402 series is distinguished by its Cryogenic-to-High-Heat resilience. Unlike standard industrial sensors, the Vibro-Meter design utilizes a PEEK-encapsulated tip, which is immune to the corrosive effects of synthetic lubricants and ammonia. Furthermore, its downward compatibility with legacy VM600 and MPC4 cards ensures that plants can upgrade their sensing elements without replacing the entire rack infrastructure, providing a cost-effective path for lifecycle management.