Brand: Siemens

Siemens Maxum II FPD II Assembly 115 VAC 2021905-001

Name: Siemens Maxum II FPD II Assembly 2021905-001 | Seven Star
Brand: Siemens

Description

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 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.

Parameter	Specification
Model / Part Number	FPD II Assembly, 115 VAC, P/N 2021905-001
Detector Type	Flame Photometric Detector II (FPD II)
Power Configuration	115 VAC
Target Platform	Siemens Maxum Edition II Process Gas Chromatograph
Compatible Interfaces	Existing light pipe and PMT module (retained on upgrade)
Weight	Approx. 2.07 kg
Hardware Condition	New, genuine Siemens part number

Why Choose Seven Star LLC for FPD II Detector Upgrade Planning

Commissioning new sulfur-detection capability or replacing a full FPD II detector is a bigger decision than a routine spare-parts order – confirming the correct 115 VAC power configuration against the analyzer’s actual supply, and verifying which existing light pipe and PMT components will be reused versus what the assembly itself provides, both need to happen before the order ships to avoid a mismatched installation. Seven Star LLC’s sourcing team walks customers through this configuration check before the FPD II Assembly is ordered, and confirms grounding and explosion-proof installation requirements against Siemens’ documented safety procedure. We also help refinery and gas plant instrumentation teams across Oman plan detector upgrade timing around planned turnarounds, since bringing new sulfur-monitoring capability online is best scheduled rather than rushed, and we coordinate delivery across Muscat, Sohar, and the broader GCC accordingly.

Request a Quote for Siemens Maxum II FPD II Assembly 115 VAC 2021905-001

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 availability and lead time, or confirm compatibility of the FPD II Assembly 2021905-001 with your specific Maxum II configuration, contact our instrumentation sourcing team today.

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About brand

Most Siemens automation parts are bought by article number, the string beginning 6ES7, 6AV2 or 6GK5 printed on every module. Founded in 1847 and headquartered in Munich, Siemens builds the SIMATIC controllers, SCALANCE networks and SINAMICS drives that plant engineers meet on almost every site. Seven Star LLC, an independent supplier, lists Siemens PLC and I/O modules, HMI panels, industrial Ethernet switches, drives, protection relays, temperature transmitters and gas analyzer spare parts for projects in Oman and the GCC.

Siemens product families on this page

Controller hardware covers the SIMATIC S7-1200 (CPU 1214C with SM 1223 signal modules) and the S7-1500 (CPU 1515-2 PN), with ET 200SP and ET 200M distributed I/O and their IM 155-6 and IM 153-2 interface modules. Operator panels include the KTP700 Basic and TP700 Comfort. SCALANCE XC208 managed switches handle industrial Ethernet. Drives are represented by the SINAMICS G120C compact inverter and the G120X for pumps and fans. From the power side come the SIPROTEC 7SJ85 feeder protection relay and SIVACON S8 switchboards, and from process instrumentation the SITRANS TH320 head-mounted temperature transmitter.

Where Siemens equipment is used

SIMATIC controllers and ET 200 I/O run packaged units, skids and whole process lines in water treatment, oil and gas, cement, food and manufacturing plants. SINAMICS drives control pumps, fans and conveyors, SCALANCE switches form the control network, and SIPROTEC relays protect medium voltage feeders and motors.

Ordering Siemens parts: what we need

Send the complete article number, the functional status or version printed on the module and, for CPUs, the firmware version your project was written for. For drives add power, supply voltage, filter option and fieldbus version. For SIPROTEC relays the long order number or product code is required, because it fixes the hardware and function package. A nameplate photo answers most of these points at once.

Frequently Asked Questions

What does the FPD II Assembly 2021905-001 include?

It is a complete FPD II detector installation assembly configured for 115 VAC operation, providing the combustion chamber, igniter, and fiber-optic interface components needed for detector installation.

Can this be used to upgrade an existing FPD to FPD II?

Yes, the assembly is designed so the existing light pipe and PMT module are retained and reused when upgrading from an earlier FPD configuration to the FPD II.

What carrier gases can the FPD II use?

Nitrogen, helium, argon, or hydrogen can serve as carrier gas; using hydrogen as carrier reduces the additional flame fuel hydrogen flow required.

What safety consideration applies to FPD II installation?

As explosion-proof equipment, the FPD must be grounded by mounting to a metallic frame, and all Siemens installation and maintenance instructions must be followed without compromise.

Does Seven Star LLC supply this part across the GCC?

Yes, Seven Star LLC sources and supplies the Siemens Maxum II FPD II Assembly 2021905-001 to refinery, gas processing, and petrochemical customers across Oman and the wider GCC region.

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