Help with Leak Testing Equipment specifications:
Leak Test Method
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| Leak Test Method | |||
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| Bubble Testing | Used for applications that don't require high sensitivity. A Pressurized test object is submerged in a water tank. If bubbles emerge there is a leak. Specialized soap films applied to the surface of the test object are used to aid the process by lowering the surface tension and increasing the wetting ability of water. | ||
| Colorimetric Developer | The surface is treated with a developer and reacts with the activating tracer (the leaking fluid) causing a visible color change to take place at the point of leakage. Developer application method is aerosol spray, paint or treated paper. Colorimetric developers are used to leak test large single and double walled tanks, pressure and vacuum vessels, laminated, lined or double-walled parts, complex piping systems, flexible containers (such as aircraft fuel tanks), glass-to-metal seals in hybrid packages and systems that inherently contain or will contain the tracer (water, ammonia, chlorine or oil). | ||
| Electronic Gas Detection | The test object is pressurized with a tracer gas and a sniffer probe is used to scan the object for leaking gas. | ||
| Mass Extraction | Mass extraction is used to detect leak rates in the range of tracer gases like helium mass spectrometry, but with air or any other inert gas. It operates in vacuum conditions from mild vacuum to hard vacuum. Its measurement concept is to measure the amount (volume or mass) of air extracted out from a unit under test (uut) exposed to vacuum. If a uut contains fluid at the test vacuum condition, fluid boils or out-gases. The total amount of gas extracted is measured and set against the known maximum allowable defect size. | ||
| Mass Flow | Any pressure change measured by the pressure sensor is compensated for by inputting air into the test part. The amount of air that enters is measured by the flow sensor, directly determining the leak rate of the part. Leakage flow is directed across a heating element. The temperature change across a temperature transducer bridge results in an output voltage proportional to mass flow. | ||
| Mass Spectrometer (Helium Leak Detector) | This process involves the pressurizing of the test object with a helium mixture inside an airtight pressure chamber. The air is then evacuated from the chamber, creating a pressure gradient between the internal volume of the part and the vacuum. The helium molecules move out of the part through any leakage. A mass spectrometer then samples the air inside the chamber and measures the partial pressure of helium. | ||
| Hydrogen Leak Detection | The equipment is designed to detect hydrogen leaks. | ||
| Pressure Differential / Decay | A pressure decay test involves the initial inflation of the test object and the establishment of a reference pressure. After a designated amount of time, the pressure is measured again and the initial and final measurements are compared. The change in pressure can be used to calculate the leak rate given the internal volume of the device. Pressure decay is able to detect minute changes in pressure. | ||
| Ultrasonic Leak Detector | Sometimes called sonic or choked flow, turbulent flow is the most widely recognized source of ultrasonic vibrations. The turbulent flow of a fluid across a pressure boundary creates acoustic waves. These waves can be transmitted through the medium of the fluid itself, through the containment structure, or through the air surrounding the containment structure. | ||
| Other | Other unlisted, specialized, or proprietary leak testing method. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Output Options
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| Output Options | |||
| Your choices are... | |||
| Analog Voltage | Any analog voltage output. Output voltage is a simple (usually linear) function of the measurement. | ||
| Analog Current | Often called a transmitter. A current is imposed on the output circuit proportional to the measurement. Feedback is used to provide the appropriate current regardless of line noise, impedance, etc. Useful when sending signals over long distances. | ||
| Frequency / Modulated Frequency | Frequency or modulated frequency output (e.g., sine wave, pulse train, AM, or FM). | ||
| Switch or Alarm Signal | The output is a switch or alarm. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Local Interface
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| Local Interface | |||
| Your choices are... | |||
| Analog Front Panel | Has analog user inputs such as potentiometers, dials, switches, etc. | ||
| Digital Front Panel | Setup or program through the front panel using digital keypad, menus, etc. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Computer Interface? | Can be controlled or monitored remotely with a computer via interface. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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Computer Interface Options
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| Computer Interface Options | |||
| Your choices are... | |||
| Serial Interface | Serial communication protocol such as RS232, RS485, or USB. | ||
| Parallel Interface | Parallel communication protocols such as GPIB / IEEE 488 / HPIB Protocol. | ||
| Other | Other unlisted, specialized or proprietary interface requirements such as modem, RF transmitter, etc. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Application Software Included? | For control or for monitoring meter. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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Display Type
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| Display Type | |||
| Your choices are... | |||
| Analog Meter or Indicator | Includes needle meters, LED indicators, etc. | ||
| Digital Readouts | Numerical or application-specific readouts | ||
| Video Display Terminal | Generic video display terminal, e.g., CRT, flat panel displays, etc. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Features
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| Self-calibrating? | The leak detector is capable of calibrating itself. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| Memory Capability or Data Logging? | The leak detector has memory or data logging capabilities for storing data for later use. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| Timer? | The leak detector has a timer. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| Audible Alarm Option? | The leak detector has an option for audible alarms. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| Trigger Options? | Equipment can be set to switch or alarm at low limits, high limits, etc. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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Environment
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| Operating Temperature | This is the full required range of ambient operating temperature. | ||
| Search Logic: | User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria. | ||
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