Help with Vacuum Gauges and Instruments specifications:
Specifications
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| Vacuum Range | Measures vacuum (below atmospheric pressure). Enter the range from lowest vacuum to highest vacuum (e.g., from 0 to 30 inches of Hg VAC). | ||
| 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 | The difference (error) between the true value and the indication expressed as percent of the span. It includes the combined effects of method, observer, apparatus and environment. ASME B40.1 and DIN accuracy grades are frequently used: Grade 4A (0.1% Full Scale) Grade 3A (0.25% Full Scale) Grade 2A (0.5% Full Scale) Grade 1A (1% Full Scale) Grade A (1% middle half, 2% first and last quarters) Grade B (2% middle half, 3% first and last quarters) Grade C (3% middle half, 4% first and last quarters) Grade D (5% Full Scale) Measurement Accuracy (% of Full Scale). In cases where the accuracy differs between middle span and the first and last quarters of the scale, the largest % error is reported. | ||
| Search Logic: | All matching products will have a value less than or equal to the specified value. | ||
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| Operating Temperature | 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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| Liquid | The device measures the pressure of liquids. | ||
| Gas | The device measures the pressure of gases. | ||
| Hazardous | The device is rated by the manufacturer for hazardous duty. | ||
| Other | Other unlisted, specialized, or proprietary materials to measure. | ||
| 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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Display
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| Analog Meter | The device has an analog meter or simple visual indicator. | ||
| Digital | The device has a display for numerical values. | ||
| Video | The device has a CRT, LCD or other multi-line display. | ||
| Other | Other unlisted, specialized, or proprietary displays. | ||
| 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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| Scale Type: | Search Logic: An item matches if it has ANY of the attributes you select. Selecting none (or all) of the options will match everything. | ||
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| Single Scale | Measurement scale displays pressure in only one set of units on the dial face. | ||
| Dual Scale | Measurement scale displays pressure in two sets of units on the same dial face. | ||
| 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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| Scale Units: | Scale Units: Select the desired pressure measurement units. Common units are given. Special units and compound ranges are usually available. | ||
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| psi | Pounds per square inch: psi, PSI, lb./in^2, or lb./sq. in. | ||
| kPa | kilo Pascal’s - standard atmospheric pressure is 101,325 Pa or 101.325 kPa | ||
| bar | A unit of measure of atmospheric pressure. One bar is equal to 0.987 atmospheres | ||
| inches of Hg | One inch of mercury is equivalent to 33.86 millibars. | ||
| cm of Hg | A metric measure of pressure. | ||
| feet of H2O | The pressure equivalent for 1 foot of water is .0295 atm | ||
| kg/cm2 | The pressure equivalent for 1 kg/cm2 is .9678 atm | ||
| oz./in2 | The pressure equivalent for 1 atmosphere of pressure is approx. 235 oz. / in2 | ||
| inches of H2O | The pressure equivalent for 1 inch of water is .00245 atm | ||
| Other | Other unlisted or specialized scale units. | ||
| 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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Additional Output and Features
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| Signal Output | Signal output is the type of electrical signal produced. | ||
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| Analog Voltage | The output voltage is a simple (usually linear) function of the measurement. | ||
| Analog Current | Analog current levels or transmitters such as 4 – 20 mA are suitable for sending signals over long distances. Current is imposed on the output circuit proportional to the measurement. Feedback is used to provide the appropriate current regardless of line noise and impedance. | ||
| RS232 / RS485 | RS232 and RS485 are serial communication protocols that transmit data one bit at a time. RS232 provides a standard interface between data terminal and data communications equipment. RS485 can be transformed into a multi-point application. | ||
| Parallel | Parallel outputs such as printer ports and Centronics ports transmit data in groups of bits. The general-purpose interface bus (GPIB) or IEEE 488 is a popular parallel interface for connecting computers, peripherals, and laboratory instruments. | ||
| HART® Protocol | The highway addressable remote transducer (HART®) protocol uses 1200 baud frequency shift keying (FSK) based on the Bell 202 standard to superimpose digital signals on conventional 4-20 mA analog signals. This enables two-way communication and facilitates the transmission of information beyond normal process variables to and from smart field instruments. The HART protocol communicates without interrupting the analog signal and allows a host application (master) to receive two or more digital updates per second from a field device (slave). Because they are phase-continuous, the digital FSK signals do not interfere with the analog 4-20 mA signals. HART is a registered trademark of the HART Communication Foundation. | ||
| PROFIBUS® | The process fieldbus (PROFIBUS®) is a popular, open communication standard used in factory automation, process automation, motion control, and safety applications. PROFIBUS is standardized in IEC 71158 and IEC 61784 and is suitable for both fast, time-critical applications and complex communication tasks. PROFIBUS is a registered trademark of PROFIBUS International. | ||
| DeviceNet | DeviceNet uses controller area network (CAN) network protocol to connect industrial devices such as limit switches, photoelectric cells, valve manifolds, motor starters, drives, and operator displays to programmable logic controllers (PLCs) and personal computers (PCs). | ||
| FOUNDATION Fieldbus | The FOUNDATION fieldbus is a serial, all-digital, two-way communication system that serves as a local area network (LAN) for factory instrumentation and control devices. It uses a line or tree topology and distributed data transfer (DDT). In the hierarchy of digital networks, the FOUNDATION fieldbus is on the lower end. | ||
| Ethernet | Ethernet is a local area network (LAN) protocol that uses a bus or star typology and supports data transfer rates of 10 Mbps. The Ethernet specification is the basis for the IEEE 802.3 standard, which specifies the physical and lower software layers. To handle simultaneous demands, Ethernet uses carrier sense multiple access / collision detection (CSMA/CD) to monitor network traffic. | ||
| Frequency | The output signal is encoded via amplitude modulation (AM), frequency modulation (FM), or some other modulation scheme such as sine wave or pulse train; however, the signal is still analog in nature. | ||
| Special Digital (TTL) | Devices produce digital outputs other than standard serial or parallel signals. Examples include transistor-transistor logic (TTL) outputs. | ||
| Switch / Alarm | The output is a change in state of a switch or alarm. | ||
| Other | Other unlisted, specialized, or proprietary outputs. | ||
| 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 | |||
| Your choices are... | |||
| Temperature Output | Devices provide temperature measurement outputs. | ||
| Temperature Compensation | Devices include built-in factors that prevent pressure measurement errors due to temperature changes. | ||
| Alarm Indicator | Devices have a built-in audible or visual alarm, not just a switch or relay closure. | ||
| TTL Compatible Switch | The output switch is compatible with transistor-transistor logic (TTL). | ||
| Other | Other unlisted, specialized, or proprietary features. | ||
| 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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