Gas chromatograph UHV-645

for gas analysisFIDTCD

The UHV-645 is a gas chromatograph‑based oil dissolved gas analyzer (DGA) designed for quantitative analysis of dissolved gases in transformer insulating oil and for transformer condition assessment.

System composition

• Chromatograph host, air generator, hydrogen generator, oscillation instrument, standard gas cylinders, argon cylinder, PC and accessories.
• Modular hardware for flexible detector configuration and future upgrades.

Main functions

• Analyzes 9 gases: N2, H2, O2, CH4, C2H4, C2H6, C2H2, CO, CO2 for DGA diagnostics.
• 10/100M adaptive Ethernet with built‑in IP stack and MODBUS/TCP for DCS integration; three independent connection levels for local and remote monitoring.
• Optional NetChrom™ workstation for centralized control of multiple chromatographs; Chinese/English user interface.
• User‑configurable temperature control zones; 6 independent channels and 16‑step programmable ramps; oven range RT+5℃ to 400℃; heating/cooling 0.1–40℃/min; precision ±0.1℃.
• Multi‑processor parallel operation for stability; supports multiple detectors (FID, TCD, ECD, FPD, NPD) and flexible detector installation.
• Optional electronic flow controller (EFC) and electronic pressure controller (EPC) for digital gas control and improved reproducibility.
• Timing self‑start program for scheduled/online analyses (requires online automatic sampling hardware); automatic detector recognition, fault diagnosis and power‑off data protection.
• 24‑bit low‑noise AD acquisition with baseline storage and subtraction; compatible with WinXP/Win2000/Windows7; reads CDF files and integrates with Agilent/Waters workstations.

Technical specifications / summary

• Network anti-control system:Internal CAN's way, with interface board design, It can be converted to network port output at will
• Signal output bits :24-bit
• Communication interface :Network interface output(class 6 network cable connections)
• Circuit design: ARM embedded design for easy wireless control, remote control and mobile app control
• Temperature control system: Six-way independent temperature control
• Temperature control: Room temperature - 450 ℃, liquid nitrogen refrigeration: - 80 ℃ - 450 ℃
• Column box temperature control accuracy :±0.02℃
• Program heating up :21 Stage 21 level, 0.1 ℃ / stage
• Show module: Large-screen LCD
• Display accuracy: 0.01 ℃
• Lift rate of column and box: 0~80 ℃ / min (adjustment increment 0.1 ℃ / min) up to 120 ℃ / min
• Temperature reprogrammed repeatability: ≤1%
• TCD detector sensitivity :S value ≥ 10000mv.ml/mg (benzene) )up to 12000 mv.ml/mg (benzene)
• Baseline noise: ≤10uv
• Baseline Drift: ≤50uv/30min
• Detection limit of FID detector :≤5 x 10^-12g/s(cetane)
• Baseline noise :≤2 x 10^-14A
• Baseline Drift: ≤1×10^-13A/30minAfter the instrument stabilizes for 2 hours
• Detection limit of ECD detector :≤1.0 x 10^-13g/s r-666
• Baseline noise: ≤40uv
• Baseline Drift:≤100uv/30min
• Detection limit of FPD detector: ≤1.4 x 10^-12 g/s(p), ≤5×10^-11g/s(S)
• Baseline noise: ≤20uv
• Baseline Drift:≤50uv/30min
• Extended:≤6 external events can be added
• Automation engineering Can be increased: automatic ignition function, automatic sampler connection, four-way flow pressure display function, optional counter-control workstation to achieve counter-control

Installation environment requirements

• The gas chromatograph should be used within the temperature and relative humidity ranges of 5-35 ℃ and 0-85%, respectively. But it is best to use it in an environment that people feel comfortable with (appropriate constant temperature and humidity conditions). This way, the instrument can perform at its best and have the longest service life.
• If the instrument is exposed to corrosive substances (whether gas, liquid, or solid), it will endanger the materials and components of the gas chromatograph and should be avoided.
• The test bench for installing the gas chromatograph must be stable. The vibration of the test bench can affect the stability of the instrument. In order to facilitate the discharge of hot air from the column furnace, at least 30cm of space should be left behind the instrument (and flammable materials should not be placed behind!), as well as a 30-40cm passage for the installation and maintenance of the chromatograph.
• If you need 10/100M Ethernet, you can use HUB or switch to build Ethernet.

Application field

• 1. Petrochemical industry: By analyzing samples of crude oil, refined oil products, and lubricants, it is possible to determine whether they meet the requirements. At the same time, quality issues during the production process can also be analyzed and resolved.
• 2. Environmental monitoring field: By analyzing and detecting pollutants in soil, water, air and other samples, it can help people understand the status and sources of environmental pollution, and take corresponding measures to protect the environment.
• 3. Pharmaceutical field: Oil chromatography analyzer can also be used for related research and experiments in pharmaceutical, biomedical and other fields, such as analyzing drug metabolites, detecting biomarkers, etc.