Siemens Maxum II FPD II Assembly 115 VAC 2021905-001

Overview: A Complete Sulfur-Selective Detector Installation Kit

The Siemens Maxum II FPD II Assembly, part number 2021905-001, is a complete Flame Photometric Detector II installation kit configured for 115 VAC operation, intended for installing or upgrading sulfur-selective detection capability on the Siemens Maxum Edition II process gas chromatograph. The FPD II builds on the combustion-based photometric detection principle used by the standard FPD, and this assembly provides the hardware needed for a full detector installation rather than an individual component replacement.

As an independent specialized supplier of Siemens Maxum Edition II analyzer spare parts, Seven Star LLC sources and supplies the FPD II Assembly 2021905-001 to refineries, gas plants, and petrochemical complexes across Oman and the wider GCC. Whether commissioning a new detector configuration or replacing a complete FPD II detector following extensive damage, Seven Star LLC helps analyzer houses source the correct genuine assembly for their 115 VAC installation.

Working Principle: Photometric Sulfur Detection

The FPD II detects sulfur-containing compounds by combusting sample components in a hydrogen-rich flame within its combustion chamber, producing light emission at wavelengths characteristic of excited sulfur species. A filter passes only these characteristic wavelengths through to a photomultiplier tube (PMT), which the FPD II shares with the light pipe interface used across the FPD detector family, converting the filtered light into an electrical signal proportional to sulfur concentration in the sample stream.

Because the FPD is a highly sensitive detector, the gases and their supply lines feeding it must be extremely clean and sulfur-free to achieve a strong signal-to-noise ratio; nitrogen, helium, argon, or hydrogen can serve as the carrier gas, with hydrogen carrier reducing the additional flame fuel hydrogen flow required. As explosion-proof equipment, the FPD II integrates with the Maxum Edition II’s required safety systems, and the assembly’s 115 VAC configuration must match the analyzer’s available power supply for correct operation.

Engineering Design of the FPD II Assembly

The 2021905-001 assembly bundles the detector hardware needed for a 115 VAC FPD II installation, including the combustion chamber, glow-plug igniter, and fiber-optic interface components that connect to the existing light pipe and PMT module – both of which are retained and reused when upgrading from an earlier FPD configuration to the FPD II. This design approach allows analyzer houses to gain the FPD II’s capability without necessarily replacing every downstream optical component.

Given that the FPD is explosion-proof equipment with mandatory safety systems, Siemens documentation specifies that all instructions and warnings for FPD maintenance and installation must be followed without compromise, and that grounding of the FPD must be ensured by mounting it to a metallic frame as part of correct installation practice.

Key Features

The FPD II Assembly 2021905-001 provides a complete path to sulfur-selective detection on 115 VAC Maxum Edition II installations. Key characteristics include:

• Complete FPD II detector installation assembly configured for 115 VAC operation.
• Retains compatibility with existing light pipe and PMT module components during detector upgrades.
• Photometric sulfur detection via characteristic flame-emission wavelength filtering.
• Explosion-proof design requiring correct grounding and safety system compliance.
• Genuine Siemens Maxum II part number for correct fit and safety-certified operation.

Industrial Applications

The FPD II Assembly is used when commissioning new sulfur-monitoring capability or replacing a complete FPD detector on a Maxum Edition II analyzer, supporting applications such as natural gas sulfur specification testing, refinery sulfur recovery unit monitoring, and petrochemical process streams where trace sulfur content affects product quality, catalyst life, or regulatory compliance. Its 115 VAC configuration suits installations where that voltage is the available detector power supply.

Seven Star LLC supports refinery instrumentation teams, gas processing operators, and petrochemical maintenance departments across Oman, Muscat, Sohar, and the broader GCC region with sourcing of Maxum Edition II FPD II detector assemblies, helping analyzer houses expand or restore sulfur-selective detection capability.

Technical Specifications

The table below summarizes the core specifications of the Siemens Maxum II FPD II Assembly as supplied by Seven Star LLC.

Call To Action

Seven Star LLC is a dedicated supplier of Siemens Maxum Edition II process gas chromatograph spare parts and FPD II detector assemblies throughout Oman and the GCC. To request a formal B2B quotation, verify current stock availability, or confirm compatibility of the FPD II Assembly 2021905-001 with your specific Maxum II configuration, contact our instrumentation sourcing team today.