DHVE has over 5 decades of experience in innovative design and development of vacuum heat treatment and Brazing furnaces, from small laboratory models to large vertical and horizontal furnaces as well as equipment for other specialized applications. DHVE is offering complete solutions, to meet the most stringent requirements for reliability, productivity and cost-efficiency, with valuable insight into the changing needs and rigorous demands. HEAT TREATMENT & BRAZING FURNACE VERTICAL,BOTTOM & TOP LOADING FURNACE GAS & OIL QUENCHING FURNACE LABORATORY FURNACE

The successful outcome of any brazing operation is that the mating surfaces of the joint are substantially free from oxide films when brazing alloy melts and flows. Vacuum brazing is no different in this respect to any other brazing procedure; oxide-film removal has to be achieved before the production of a satisfactory joint can be achieved Vacuum brazing is not only efficient, cost effective and environmentally friendly – working in a vacuum also allows brazing without aggressive and environmentally damaging fluxing agents. It also makes it possible to do without complex reworking or finishing of the treated components. The lack of flux inclusions in the base material improves its mechanical stability and corrosion resistance, thereby improving its joint strength and the durability of the treated components. Vacuum brazing with DHVE furnace technology is simply perfect. The advantages of high temperature brazing in fine or high vacuum make it predestined for use in producing joints that must stand up to intense thermal conditions and heavy mechanical loads. The use of vacuum brazed components has become well established in safety-critical aerospace technologies. Whether you are talking about jet engine components and control systems, turbine blades, heat ex changers and heating coils, honeycombs and fasteners, or medical implants and instruments, the list of products that achieve their incredible performance characteristics thanks to vacuum processing is extensive. DHVE has been in the field of vacuum science and technology for over 5 decades offering hardware, measuring instrument, controllers to vacuum equipment with process solutions in vacuum technology with indigenous, but match to the international standards from raw material selection through manufacturing process to demonstrating it for repeatable quality results. The recently made vacuum brazing furnace is a horizontal front loading high vacuum heat treatment with external gas quench furnace is intended

For accurate measurement of pressure in the rough to high vacuum range 10^{-3} to 10^1 mbar), the Pirani Gauge is an industry standard. This thermal conductivity gauge provides reliable, cost-effective, and robust pressure monitoring, making it indispensable for controlling vacuum processes and protecting high vacuum equipment. Dinesh High Vacuum Engineering (DHVE) supplies a versatile range of Pirani Gauges, offering both the simplicity and durability of Analog units and the high precision and integration features of Digital sensors, ensuring you have the right monitoring tool for every application. I. ⚙️ The Pirani Principle: Measuring Pressure via Thermal Conductivity The Pirani Gauge operates based on the principle that the thermal conductivity of gas changes proportionally with its pressure in the rough to medium vacuum range. How It Works Heated Filament: A fine metal filament (often made of platinum or tungsten) is suspended within a sensor cell exposed to the vacuum environment. Constant Heating: An electrical current is passed through the filament, heating it to a temperature significantly higher than the ambient temperature. Heat Loss: Heat is lost from the filament primarily through two mechanisms: Radiation: This heat loss to the chamber walls is relatively constant. Thermal Conduction: This heat loss to the surrounding gas molecules is pressure dependent. Pressure Measurement: As the pressure decreases (i.e., the vacuum improves), fewer gas molecules are present to carry heat away from the filament. This causes the filament's temperature to increase, which, in turn, causes its electrical resistance to increase. The gauge circuitry measures this change in resistance and converts it into a pressure reading. Note: Pirani gauges are gas-type dependent. The reading is accurate for the calibration gas (usually Nitrogen or Air). If measuring other gases (e.g., Helium, Argon), conversion factors must be applied, as each gas has a unique thermal conductivity. II. 📊 The Legacy: Analog Pirani Gauges (DHVE Classic Series) Analog Pirani Gauges are known for their simplicity, reliability, and cost-effectiveness. They utilize basic bridge circuitry and rely on a physical meter movement to display the pressure. They are often chosen for applications where a simple, quick visual confirmation of vacuum status is required. Key Features of DHVE Analog Pirani Gauges: Simple, Durable Operation: They are highly reliable with minimal complex electronics, making them durable for continuous industrial use. Visual Indication: The needle movement on the meter provides an intuitive, quick check of vacuum status (e.g., 'Good Vacuum' or 'Rough Vacuum'). Cost Efficiency: They offer the most economical entry point for accurate measurement in the 10^{-3} mbar range. Output: They typically provide a basic electrical output (often a 0-10V signal) proportional to the pressure, easily integrated with older control systems or simple relays. III. 💻 The Future: Digital Pirani Gauges (DHVE Smart Sensors) Digital Pirani Gauges integrate microcontrollers and sophisticated signal conditioning directly into the sensor head, offering greater precision, stability, and connectivity than their analog counterparts. They are essential for automated and data-intensive modern vacuum systems. Key Features of DHVE Digital Pirani Gauges: Enhanced Accuracy and Stability: Digital linearization and precise temperature compensation circuitry provide a highly stable and accurate reading across the entire measuring range. Microprocessor Control: Allows for advanced functions like automatic zero adjustment and endpoint calibration for increased precision and ease of use in the field. Digital Communication: Equipped with digital interfaces (e.g., RS-232, RS-485, or fieldbus protocols), enabling seamless integration into PLC-controlled systems, remote monitoring, and complex data logging. Integrated Display and Relays: Features integrated digital LED or LCD screens for direct pressure reading at the point of use. Many include internal set-point relays, enabling the gauge to automatically trigger system events (e.g., turning on a Turbomolecular Pump or opening a valve) when a specific pressure threshold is reached. Combined Sensing (Optional): DHVE offers advanced digital units that combine the Pirani sensor with a thermal-coupled MEMS sensor for faster response and improved linearity near atmospheric pressure. IV. 🌍 Applications Across Industries Both analog and digital Pirani Gauges are essential for many processes monitored by Dinesh High Vacuum Engineering clients. The choice between them depends on the need for simple indication versus automation and data integration: Fore-Vacuum Monitoring: Monitoring the inlet pressure to a Turbomolecular Pump or Roots Blower is crucial to ensure the backing pump reaches the safe startup pressure, often best handled by the reliable switching of Digital gauges. Vacuum Furnace Control: Used to monitor pump-down progress in the rough and medium vacuum stages. Freeze Drying (Lyophilization): Digital gauges are preferred for precise monitoring and data logging of chamber pressure during the critical drying cycles to ensure product quality. General Lab Vacuum: Analog gauges offer a simple, visual, and cost-effective pressure check for rotary evaporators or desiccators, while Digital units are integrated into analytical instrumentation. PVD/CVD Coating Systems: Used to monitor pressure during gas-backfilling and process transitions in the medium vacuum range. Choose Precision and Reliability with DHVE Whether your operation requires the fundamental reliability of an Analog Pirani Gauge or the advanced integration and precision of a Digital Pirani Gauge, Dinesh High Vacuum Engineering (DHVE) provides quality, calibrated instruments engineered for accuracy and longevity. ➡️ Optimize your vacuum system control. Contact Dinesh High Vacuum Engineering today to select the ideal Pirani Gauge—Analog or Digital—for your pressure monitoring needs and system integration requirements!

A high voltage is applied and the gas is introduced. The positive argon ions go through an acceleration process on the negative cathode and then expel the atoms of the metal plate (evaporating material), which then fall onto the substrates already in the chamber and condense the desired metal coating onto the substrate. The impact of the atoms on the evaporating material produces “Sputtering”, as a result of the acceleration given by the succeeded particles. Unlike many other vacuum deposition techniques, there is no fusion of material, therefore all the metals and alloys can be deposited with high efficiency and control. If a reactive gas such as nitrogen or acetylene is introduced into the chamber together with the process gas, the nitride which reacts to the carbide, develops on the substrates. Different cathodes made of different materials can be inserted in a vacuum coating system to produce multiple layer systems. It is also possible to modify the combination of the single layers by varying the combination of the reactive gases.

For rugged, reliable measurement in the high vacuum to ultra-high vacuum range (typically 10^{-2} to 10^{-9} mbar), the Analog Penning Gauge (also known as a Cold Cathode Gauge) is the industry's preferred workhorse. Unlike hot-cathode gauges that use delicate filaments, the Penning gauge is robust, resistant to sudden pressure bursts, and ideal for harsh industrial environments. Dinesh High Vacuum Engineering (DHVE) supplies high-quality Analog Penning Gauges designed to provide operators with immediate, clear visual feedback on deep vacuum levels without the complexity or fragility of other high-vacuum sensors. I. ⚙️ Principle of Operation: The Cold Cathode Discharge The Penning Gauge measures pressure through gas ionization. However, unlike 'hot' gauges that boil electrons off a filament, the Penning gauge uses a high voltage and a magnetic field to create a self-sustaining discharge at low pressures. How It Works The Cell Structure: The gauge head contains two electrodes: an anode (usually a central ring or rod) and a cathode (plates or a cylinder connected to ground). High Voltage: A high DC voltage (typically 2 to 3 kilovolts) is applied between the anode and cathode. This electric field accelerates any free electrons present in the chamber. The Magnetic Trap: A strong permanent magnet surrounds the gauge tube. This magnetic field forces the electrons to travel in long, spiraling helical paths rather than going straight to the anode. Ionization: Because the electrons travel such a long distance, their probability of colliding with gas molecules increases dramatically. These collisions knock electrons off gas molecules, creating positive ions. Current Measurement: The positive ions are attracted to the cathode, creating an electrical current. This discharge current is directly proportional to the gas density (pressure). The analog meter measures this current and displays it as a pressure reading. II. 📊 Why Choose an Analog Penning Gauge? While digital sensors are common, the Analog Penning Gauge from DHVE offers specific advantages that keep it relevant and highly valued in heavy industry: Extreme Robustness (No Filament): The 'Cold Cathode' design means there is no hot filament to burn out. This makes the gauge incredibly durable and immune to failure from vibration or accidental exposure to atmospheric pressure (air inrush), which would instantly destroy a hot-cathode gauge. Instant Visual Trend Monitoring: The analog needle movement allows operators to see the rate of pump-down or pressure fluctuations at a glance, often faster and more intuitively than watching jumping digits on a screen. Cost-Effective High Vacuum Sensing: Penning gauges are generally more affordable than Bayard-Alpert (hot cathode) gauges while covering a similar high-vacuum range. Low Maintenance: The sensing head is simple and can often be disassembled and cleaned (sandblasted or polished) to remove contaminants, extending its life indefinitely. III. 🌍 Essential Applications for DHVE Penning Gauges The rugged nature of the Penning Gauge makes it the standard choice for industrial high-vacuum equipment where reliability is key: Vacuum Furnaces: Monitoring deep vacuum levels during sintering, brazing, and annealing processes where heat and vibration are present. PVD Coating Systems: Ensuring the chamber reaches the base pressure (e.g., 10^{-5} or 10^{-6} mbar) before the coating process begins. Particle Accelerators & Physics: Providing reliable monitoring of beamlines and large vacuum vessels. Electron Microscopy: often used as a robust interlocking gauge to protect the column. Leak Detection: Used as a durable sensor to indicate when a system is tight enough to switch to a leak detector. IV. Limitations to Consider While robust, DHVE advises customers to be aware of the specific characteristics of Penning technology: Starting Delay: At very low pressures (below 10^{-6} mbar), the discharge may take a few seconds (or minutes in extreme cases) to 'ignite' because there are so few gas molecules to start the ionization chain. Accuracy: They are generally less accurate (typically pm 30 to 50) than hot-cathode gauges, which is usually acceptable for industrial 'go/no-go' monitoring but less so for precision research. Cleaning: Over time, carbon deposits (from hydrocarbon vapors) can build up on the cathode, requiring periodic cleaning to maintain sensitivity. Durability Meets Depth with DHVE For industrial applications where you need to measure down to 10^{-9} mbar without worrying about burning out a sensor every time someone opens a valve too fast, the Analog Penning Gauge is the answer. Dinesh High Vacuum Engineering (DHVE) ensures you get a gauge built for the toughest environments. ➡️ Equip your high vacuum systems with the most durable sensor on the market. Contact Dinesh High Vacuum Engineering today for a quote on our Analog Penning Gauges!

PERFORMANCE YOU CAN TRUST ON The DHVE series is the ultimate range of best oil sealed rotary vane pumps- The result of more than 35 years’ experience and a clean sheet design programmer, these rugged vacuum pumps offer an excellent ultimate vacuum with good pumping speeds as well as superior vapor handling capabilities and quiet operation. The firm offers Rotary vane vacuum pumps are designed with decade of experience for excellent performance and modest maintenance. They are widely used for Laboratory distillation, Screen Printing, Bottle Filling Pharmaceuticals, Food beverages industries with proven performance. These pumps are available in various models such as V-Belt Driven, Direct Driven and Flange type. Specialist in compact design is its success for application in Offset Printing, Cartooning, Powder filling, Labelling, Packaging Industries. Versatile vacuum pumps with unique features successfully proved on Semi / High speed automatic Capsule filling machines / Filtration / transferring / Holding / Conveying & Packaging machines. Applications- You can be assured DHVE has the application expertise and the pumps or integrated system solution to meet your needs. Mass spectrometry- • GCMS, LCMS, ICPMS, MALDI, RGA, surface science, leak detectors High energy physics- • Beam lines, accelerators, mobile pump carts, turbomolecular pump backing, laser evacuation Research and development- • Chamber evacuation, coating systems, turbomolecular pump backing Industrial- • Glove boxes, coating systems, freeze drying, gas bottle filling/emptying, refrigeration system manufacture, degassing/curing (oil, epoxy resin) Chemical- • Gel dryers, glove boxes, rotary evaporators, centrifuges, distillation/extraction/filtration

We are in the business of Vacuum Science and Technology for more than 40 years. We manufacture world class High Vacuum Metallizing Plants / Coating systems in different configurations like: - Horizontal Coating Plants - Vertical Double Door Coating Plants - Vertical Single Door Coating Plants - Box Type or Sheet Glass Coating Plants Metalizers for plastic, Ceramics and metals Gift items Coatings of diameter 54" X 52 Depth horizontal or customized. Coating units for statues, ladies sandal heals, fan monograms, vehicle monograms, wall Clock/Photo frame metallic coating plants. Gem/glass bids coating units. Indian and Imported Metalizing Plants

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Vacuum Chamber are Precise instruments for experimentation, powerful tools for productivity DHVE Vacuum Chambers provide the foundation for a broad range of systems, serving uses from scientific experimentation to industrial production. DHVE ’s vertically integrated engineering sales, design and fabrication method positions the company to respond to stock order and custom fabrication requirements promptly and cost effectively. Component and Package leak testing, degassing, vacuum process methods, altitude flight and deep space simulations; DHVE Vacuum Chambers serve as powerful and well crafted tools in countless sciences and industries. For more info visit us at www.vaccumpumpmanufacturer.com