Autronica 7251-005.0002 LMR-200 Temperature Card Module

Description

Product Introduction

The Autronica 7251-005.0002 (Designation: LMR-200) is a specialized analog temperature amplifier and conditioning module manufactured for Autronica marine automation and machinery monitoring systems. Designed to slot into centralized monitoring card racks, this Eurocard PCB processes low-level thermal signals from field-installed resistance temperature detectors (RTDs) or thermocouples.

Engineered specifically for harsh marine engine room environments, the LMR-200 provides stable signal linearisation, zero/span calibration adjustments via onboard potentiometers, and high noise immunity against heavy generator interference. Replacing a drifting or component-degraded 7251-005.0002 board clears false exhaust gas temperature high-alarms, stabilizes fluctuating temperature readings, and maintains critical thermal monitoring for main propulsion engines and auxiliary machinery.

Key Technical Specifications

Application Scenarios & The “Trench” Experience

It is 3:00 AM on a ocean-crossing container vessel. The chief engineer is alerted by a false “Main Engine Cylinder Exhaust Gas High Temperature Alarm” on the centralized bridge display. Physical pyrometer checks confirm actual exhaust temperatures are perfectly normal, but the telemetry output from the LMR-200 card in the machinery alarm rack has drifted wildly due to heat-aged operational amplifier ICs.

• Marine Main Engine Monitoring – Exhaust Gas Temperature (EGT) Telemetry – Conditions high-temperature sensor signals across individual engine cylinder outlets.
• Auxiliary Generator & Gearbox Protection – Bearing & Oil Temperature – Measures critical mechanical bearing temperatures to prevent thermal seizure.
• Retrofits & Life Extension – Drop-in Hardware Spare – Replaces legacy temperature processing boards without modifying central monitoring software or panel backplane wiring.

Field Case Study

During sea trials following a major drydock overhaul, a vessel’s alarm system flagged erratic temperature spikes on three main engine turbocharger monitoring channels. Diagnostics traced the issue to degraded capacitors on an original 7251-005.0002 (LMR-200) card after 15 years of engine room thermal exposure. Swapping in a pre-tested replacement LMR-200 unit stabilized all channels instantly, allowing the vessel to pass class trials with zero outstanding deficiencies.

7251-005.0002

7251-005.0002

Transparency SOP: Quality Assurance & Testing

We do not just ship boxes; we test them on actual equipment-compatible test benches before they ship to your job site. Our 5-step bench verification process includes:

1. Inbound Visual & Optical Inspection: Thorough inspection of the gold pin connector, PCB traces, trimmer potentiometers, and onboard discrete components for heat discoloration or corrosion.
2. Conformal Coating Integrity Audit: Verification that protective PCB coatings remain intact to shield sensitive analog circuitry from humid, oily marine air.
3. Static Electrical Checks: Multi-point resistance checks across DC supply rails and signal inputs to verify zero internal shorts.
4. Precision Signal Injection Test: Board energization inside a test rack with multi-point simulated resistance/millivolt input injection to verify amplification accuracy, linearity, and trip point adjustment.
5. ESD-Safe Sealed Packaging: Deep cleaned, labeled with part and revision numbers, and vacuum-sealed inside anti-static ESD bags with custom foam protective boxing.

The Veteran’s Tech Trap Guide (Crucial Value-Add)

• ⚠️ Document Potentiometer & Jumper Settings First: Before removing the old 7251-005.0002 card, measure and note the physical position of all onboard trimpots and jumper links. Analog cards like the require calibration matching to the specific temperature range (-200°C to +600°C) used on that channel.
• ❗ Isolate Rack Power Prior to Extraction: Always switch off power to the alarm rack or pull the specific channel power fuse before pulling or inserting Eurocard PCB modules to prevent arcing connector pins.
• ⚠️ Calibrate Zero & Span After Installation: After installing the replacement card, perform a two-point temperature simulation using a precision decade box to fine-tune the onboard Zero and Span potentiometers to match your panel’s meter scale.

Frequently Asked Questions (FAQ for Conversion)

Q: Is the Autronica 7251-005.0002 () a plug-and-play card?

A: Physically, yes—it slides directly into the Eurocard rack slot. However, because it processes precision analog temperature signals, you must calibrate the onboard Zero/Span trimpots to match your specific sensor scale after installation.

Q: How do I confirm this is the exact module needed for my system?

A: Check the silk-screened text or white label on the circuit board surface. It must explicitly state Part Number 7251-005.0002 or Model .

Q: Are these units certified for marine class survey compliance?

A: Yes. All replacement Autronica modules are original OEM units built to comply with international maritime classification rules (DNV, ABS, Lloyd’s Register).

Q: What warranty coverage is included with this Autronica module?

A: All marine and industrial control replacement parts are backed by a comprehensive 12-month full replacement warranty. If the 7251-005.0002 card exhibits any operational defect within one year, we replace it or issue a full refund.