ABB 804A005-1 is a dedicated Flame Photometric Detector (FPD) amplifier assembly matched with the second-generation PGC5000 process gas chromatograph. It has two hardware revisions, V1 and V2, and serves as the core sensing unit for online industrial detection of trace sulfur and phosphorus components.
This unit integrates a photomultiplier tube, high-voltage ignition circuit, gain adjustment circuit and supporting constant-temperature structure. It is compatible with PGC5000B and PGC5000C intelligent column ovens, as well as the PGC5007 total sulfur analyzer. It enables continuous online measurement of sulfides and organophosphorus compounds at ppb levels. Featuring industrial explosion-proof certification, long maintenance-free operation cycles and low baseline drift, it is widely deployed in online analysis applications for oil & gas, chemical and refining industries.
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Technical Features
Dual-Version Gain Adjustment Architecture
Version V1 adopts an adjustable potentiometer R71 for manual gain control; Version V2 realizes segmented gain regulation via on-board DIP switches, with the target baseline value controlled within the range of 35–40 mV.
Thermoelectrically Cooled Photomultiplier Tube (PMT)
Suppresses thermal noise and extends the service life of the photoelectric tube.
Built-In Independent High-Voltage Ignition Circuit
The automatic ignition logic is integrated into the main control program, supporting real-time alarm upon flame loss.
Dual-Channel Optical Filter Configuration
Equipped with a 394 nm characteristic filter for sulfur and a 526 nm characteristic filter for phosphorus; the sulfur-to-hydrocarbon selectivity exceeds 10,000:1.
Flameproof & Explosion-Containment Structure
Matched with column ovens of Gb/Gc protection grades, complying with installation specifications for hazardous chemical explosion-proof areas.
CAN Bus Digital Signal Transmission
Supports DQR dynamic QR code fault reporting and linkage with the main control diagnostic system.
High-Speed Sampling & Superior Detection Performance
Sampling rate reaches 250 Hz; dynamic range is 10³ for sulfur and 10⁴ for phosphorus. Detection limits: S 2.5 pg/s, P 55 fg/s.
Modular Plug-And-Play Design
The amplifier circuit board can be replaced without complete disassembly of the column oven.
Product Characteristics
Excellent Stability
The luminous signal of hydrogen-rich flame outputs linearly. The baseline drift amplitude remains extremely low during long-term operation, eliminating frequent automatic zero calibration.
Strong Anti-Interference Capability
A dedicated purge gas channel isolates water vapor and impurities from contaminating the PMT window, eliminating signal spike noise.
Wide Compatibility
Natively compatible with the full series of PGC5000 intelligent column ovens; supports mixed installation of TCD, FID and DID detectors within one single column oven.
Comprehensive Self-Diagnosis Function
On-board status indicator lights and hexadecimal fault codes work with the HMI interface to rapidly locate faults in ignition, optical path and communication systems.
Easy Maintenance
The amplifier board is independently mounted on the side door of the column oven. Replacement only requires disconnecting flat cables, with no disassembly of the combustion furnace needed.
Full Regulatory Compliance
Meets WEEE and EMC electromagnetic compatibility standards; its explosion-proof certification conforms to specifications for Ex d flameproof enclosures.
Application Fields
Online monitoring of total sulfur and trace sulfides (H₂S, mercaptans, thioethers) in natural gas and LNG (special supporting accessory for PGC5007)
Continuous analysis of total sulfur in gasoline and diesel feedstock at refineries, compliant with ASTM D7041 test standard — ABB Group
Online monitoring of organophosphorus and sulfur-containing impurities in coal chemical syngas and process tail gas
Closed-loop quality inspection for trace sulfur impurities in fine chemical raw materials
Real-time sulfide monitoring for corrosion early warning of gas transmission pipelines
Online monitoring of organophosphorus and sulfur pollutants in environmental waste gas
Frequently Asked Questions
Q1: Is model 804A005-1 compatible with the first-generation PGC5000 chromatograph?A1: It is incompatible. This component only fits the second-generation PGC5000 Gen2 platform. The first-generation chromatograph uses dedicated, non-interchangeable FPD spare parts.
Q2: How to distinguish V1 and V2 versions of 804A005-1 during procurement?A2: Specify your requirement in the order remarks. The V1 version is equipped with a circular adjustable potentiometer R71 on the circuit board, while the V2 version features four groups of DIP switches. Purchasers may select the version matching the hardware revision of their existing column oven.
Q3: What is the maximum quantity of 804A005-1 assemblies installable in one PGC5000C column oven?A3: A PGC5000C column oven supports up to two FPD amplifier assemblies, enabling simultaneous dual-channel detection of sulfur and phosphorus. The PGC5000B model only accommodates one assembly.
Q4: Does the 804A005-1 unit come with a PMT photomultiplier tube?A4: The complete 804A005-1 assembly integrates a photomultiplier tube, ignition circuit and gain adjustment components. No separate PMT spare part purchase is required.
Q5: The FPD flame-out alarm is triggered. What are the troubleshooting steps for hardware faults on the 804A005-1?A5: First, check the pressure of hydrogen and combustion-supporting air. Next, measure the voltage at the ignition terminal. If no voltage is detected, the amplifier board is defective. If the voltage reading is normal, simply replace the ignition filament and combustion nozzle.
Q6: After replacing the 804A005-1 assembly, the baseline reading far exceeds 40 mV. How should this be rectified?A6: Calibrate the gain according to the hardware version. Fine-tune potentiometer R71 for V1 units, or adjust the DIP switch positions for V2 units. Run the Auto Zero cycle repeatedly until the baseline falls within the standard 35–40 mV range.
Q7: A large number of random spike noises appear on the chromatogram during operation. Is this caused by a faulty 804A005-1 unit?A7: First verify whether PMT purge gas supply is interrupted and inspect the optical window for contamination. If the purge gas supply is normal and the optical path is clean yet noise persists, the amplifier board’s signal circuit is confirmed defective and the spare assembly needs replacement.
Q8: Communication with the 804A005-1 is lost, and the HMI displays a DTC bus fault warning. How to resolve this issue?A8: Power off the equipment, unplug and reinsert the CAN bus flat cable, then check the on-board CAN indicator light. If the indicator does not flash, the bus module on the amplifier board is damaged, and the complete 804A005-1 assembly must be replaced.
