Description
General Information
| Item |
Specification |
| Part Number |
81943A041‑1 |
| Manufacturer |
ABB Analytical, United States |
| Product Family |
PGC2000 On‑line Process Gas Chromatograph |
| Product Type |
Thermal Conductivity Detector (TCD) Amplifier Assembly |
| Mounting |
Installed inside PGC2000 analyzer cabinet |
| Power Variant Note |
81943A041‑120 = complete 120 VAC powered assembly; 81943A041‑1 refers to amplifier hardware body |
| Status Indicator |
No on‑board LED; signal measurement via on‑board test points |
| Country of Origin |
United States |
| Lifecycle |
End‑of‑Life, original production discontinued; only surplus / used maintenance spares available |
| Warranty |
12‑month warranty for genuine surplus stock |
| BOM Full Name |
81943A041‑1, TCD Amplifier Assembly for ABB PGC2000 Process Gas Chromatograph |
| BOM Short Name |
81943A041‑1‑PGC2000, TCD Detector Amplifier Module |
Electrical & Interface Specifications
- Core Function: Amplifies micro‑volt level weak output signal from TCD thermal‑conductivity detector
- Hardware Build: Integrated isolated power transformer, precision amplifier circuits and filtering loops, enclosed in metal shielding housing for EMI suppression
- Interfaces: Internal flat cable connects to TCD detector probe; board connector links to PGC2000 main control board
- No external field‑bus interface, dedicated analog signal processing for gas chromatograph detector only
- Cannot operate standalone; must work within complete PGC2000 analyzer system
Environmental Specifications
| Item |
Value |
| Operating Temperature |
5 °C ~ +50 °C (analyzer cabinet environment) |
| Storage Temperature |
‑40 °C ~ +85 °C |
| Relative Humidity |
5‑95 % RH, non‑condensing |
| Compliance |
CE, process analyzer industry standards |
| Enclosure Rating |
IP20 (metal shield housing inside analyzer cabinet) |
Main Functions
- Amplifies faint micro‑volt signals generated by the TCD thermal‑conductivity detector of PGC2000 process gas chromatograph.
- Metal shielding housing minimizes electromagnetic interference from plant‑site environment, securing gas‑composition measurement accuracy.
- Built‑in isolated power supply delivers stable excitation power for TCD detector circuit.
- Outputs conditioned analog measurement signal to PGC2000 main control board for gas‑component calculation.
- End‑of‑life spare component, only for maintenance of legacy installed PGC2000 units.
Typical Applications
- On‑line gas composition analysis for petrochemical plant, natural‑gas processing and hydrogen‑recovery units equipped with ABB PGC2000 process gas chromatograph.
- Spare‑part replacement for faults including baseline drift, noisy signal output or complete loss of detector response.
Related Spare‑Part Reference
| Part‑No |
Description |
Remark |
| 81943A041‑1 |
TCD Amplifier Assembly hardware body |
PGC2000 spare part, obsolete |
| 81943A041‑120 |
Complete 120 VAC TCD Amplifier Unit |
Full powered assembly variant |
Important Notes
- Exclusively designed for ABB PGC2000 process gas chromatograph. Not a general‑purpose industrial signal amplifier for PLC/DCS systems. Many third‑party vendors misclassify this component.
- Handles micro‑volt sensitive signals. ESD protection must be applied during handling and replacement.
- Baseline calibration, zero‑point adjustment and full‑scale calibration are mandatory after module replacement.
- Metal shielding cover must be reinstalled after service; otherwise signal noise will increase and degrade analysis precision.
- Specify full part number 81943A041‑1 for spare‑part procurement.
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