Description
The SERVOMEX S2500965A (Assembly S2000912A) is a high-precision control board designed for Servomex gas analyzers, particularly within the 2500 series Infrared (IR) analysis platforms. This board serves as the primary processing hub, managing infrared source modulation, detector signal amplification, and temperature compensation. It is engineered to maintain extreme stability for low-concentration gas measurement in hazardous and industrial process environments.
- System Compatibility: Servomex 2500 Series Infrared Gas Analyzers
- Assembly Number: S2000912A (Main Logic & Signal Processing)
- Signal Processing: High-resolution A/D conversion for photometric sensors
- Source Control: Precision drive circuitry for IR emitters/modulators
- Communication: RS232/RS485 digital output and 4-20mA analog loops
- Supply Voltage: 24V DC regulated input
- Operating Temp: -10°C to +50°C (Standard industrial range)
Product Datasheet
| Feature | Specification |
|---|---|
| Model | SERVOMEX S2500965A |
| Assembly No. | S2000912A |
| Dimensions | 210 x 140 x 22 mm |
| Weight | 0.35 kg |
| Country of Origin | United Kingdom |
| Interface | Edge connector and multi-pin headers |
| Coating | Conformal coating for corrosion resistance |
Application Fields
This control assembly is critical for maintaining gas purity and safety in various high-stakes sectors:
- Petrochemical Refining: Monitoring CO, CO2, and CH4 levels in process streams.
- Emissions Monitoring (CEMS): Ensuring compliance with environmental regulations for stack gas analysis.
- Air Separation Units: Measuring trace impurities in high-purity nitrogen or oxygen production.
- Hazardous Area Monitoring: Integration into explosion-proof analyzer housings for offshore and chemical plant safety.
Product Instructions
- Isolation: Power down the Servomex analyzer completely. Ensure any hazardous process gases are purged from the sample cell if the board replacement requires opening the optical bench.
- Electrostatic Safety: Always use an ESD-safe workstation and wrist strap. The S2500965A contains sensitive microprocessors that can be damaged by static.
- Connection: Carefully disconnect the ribbon cables and sensor leads from the S2000912A assembly. Remove the mounting screws securing the board to the internal chassis.
- Configuration: Check for any specific hardware jumpers on the new board to ensure they match the configuration of the unit being replaced (e.g., analog output range settings).
- Calibration: After installation and a 30-minute warm-up period, a full system calibration using certified zero and span gases is mandatory to ensure measurement accuracy.
Q&A – Common Questions
Q1: What is the difference between the S2500965A and the S2000912A? A1: S2500965A is typically the orderable part number for the complete module, while S2000912A is the assembly number printed on the PCB itself. They refer to the same functional control unit.
Q2: Can this board be used across all Servomex 2500 variants? A2: While the hardware architecture is similar, the firmware or specific component populations may vary depending on whether the analyzer is configured for CO, CO2, or moisture. Verify your specific analyzer’s “Build Sheet” before replacement.
Q3: Does a “Detector Error” alarm always mean this board is faulty? A3: Not necessarily. A detector error can be caused by a failing IR source or a dirty sample cell. However, if the source is firing and the cell is clean, the signal processing path on the S2500965A board is the next logical point of failure.
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