Help with Opacity Sensors and Instruments specifications:
Device Classification
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| Sensor | Device is a sensor/transducer. Its output is meant for processor, controller or data acquisition system. No display or user interface. | ||
| Sensor System | Device is an instrument, it has display and/or user interfaces. It can be a self-contained unit. | ||
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| Measurement Output | |||
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| Extinction or Extinction Coefficient | The attenuation of light in its passage through an aerosol due to (light) scattering and absorption. | ||
| Percent Opacity | Percent opacity is a measure (usually in percent) of light extinction, defined as one minus the transmittance of an aerosol cloud. This is used mainly to assess the obscuration by smoke plumes. | ||
| Percent Transmission | Percent transmission is the ratio of the detected irradiance to the source irradiance for a beam passing through an attenuating medium. The relationship between transmission and opacity follows: % Transmission (light through the smoke) + % Opacity (light blocked by the smoke) = 100% | ||
| Optical Density | Optical density is the logarithm (base 10) of the reciprocal of the transmittance. | ||
| Soot Number | Soot number is also referred to as the smoke spot number. | ||
| Dust Density | Dust density is the concentration of dust in the sample volume. | ||
| Other | Other unlisted, specialized, or proprietary configuration. | ||
| 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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Measurement Technique
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| Technology Type | |||
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| Transmissometry | In transmissometry, light is absorbed and scattered as it passes through a mixture of gas and particles. It compares the intensity of the emitted light with the received light. Transmissometry is the optical technique of measuring the attenuation of a light beam passing through a medium. | ||
| Scattered Light Principle | Scattered light principle says that a light beam emits infrared light, which is scattered by particles in the gas. This technology is used to detect very low concentrations. Scattered light principle is the deflection of light impinging on a particle, due to the combined effects of refraction, reflection and diffraction. | ||
| Other | Other unlisted, specialized, or proprietary configuration. | ||
| 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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| Transmissometer Type | |||
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| Double Pass Extinction | In the double pass design, the light source and detector are on the same side of the stack in a unit called a transceiver. A special reflector called a retro-reflector is installed where the photocell would be in a single pass unit. The purpose of this reflector is to send the light back along the same path it came across the stack. A half silvered mirror is placed in the light path. It reflects half of the returning light from the retro-reflector onto the detector. Since the light traverses the smoke two times, the unit is called a double pass system. | ||
| Single Pass Extinction | Single pass extinction consists of a light source and photocell in a tube or attached to opposite sides of a smoke stack. The photocell is covered with a filter that makes its response similar to the spectral response of the human eye. | ||
| 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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Performance Characteristics
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| Detector Range | Detector range is the distance between the transmitter and receiver or the horizontal distance within which the monitor must function. | ||
| 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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| Accuracy | Accuracy is expressed as a percentage of the full-scale output. | ||
| Search Logic: | All matching products will have a value less than or equal to the specified value. | ||
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| Maximum Response Time | Maximum time between actuation of the sensing function and the output signal. | ||
| Search Logic: | All matching products will have a value less than or equal to the specified value. | ||
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| Input Power | |||
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| DC Power | The unit requires DC power input. | ||
| AC Power | The unit requires AC power input. | ||
| 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
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| Electrical Output | |||
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| Analog Voltage | Any analog voltage output. Output voltage is a simple (usually linear) function of the measurement. | ||
| Analog Current | Analog current is 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. Analog current is useful when sending signals over long distances. | ||
| Frequency or Modulated Frequency Output | Frequency or modulated frequency output (Ex. sine wave, pulse train, AM, FM) | ||
| Switch / Alarm | |||
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User Interface
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| Display Type | |||
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| Analog | Has an analog meter or simple visual indicator. | ||
| Digital | Has a digital display for numerical values. | ||
| Video | CRT, LCD or other multi-line display. | ||
| 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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| Programming | |||
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| 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. | ||
| Computer Interface | Can be controlled or monitored remotely with a computer via interface. | ||
| 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 | |||
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| Parallel | GPIB / IEEE-488 / HPIB Protocol. | ||
| Serial | Serial communication protocol such as RS-232, RS-485, USB. | ||
| Other | Special 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 | Applications software for control or for monitoring power source performance. | ||
| 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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Features
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| Heater | Heaters are used for outdoor or cold temperature applications. | ||
| 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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| Field Calibration | Can be calibrated in field using a calibration kit. | ||
| 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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| Self Diagnostics | Self diagnostics perform automatic verification of internal circuitry, lens cleanliness, power supply voltage and sensor operation. | ||
| 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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| Built in Calibration | Does not require external calibration. Threshold levels are pre-programmed. | ||
| 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 | The temperature range over which the device must operate. | ||
| 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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