Diaphragm Seal: A flexible membrane that seals and isolates an enclosure. The flexible nature of this seal allows pressure effects to cross the barrier but not the material being contained. Diaphragm seals are commonly used to protect pressure sensors from the fluid whose pressure is being measured.
Things to Consider: Chemical compatibility, Continuous duty capability even if sensor is removed from the seal, Cleanability and ease of inspection, Ruggedness, Corrosion resistance, Pressure range, Temperature range, Wetted materials (diaphragm and bottom housing), Fill solutions options: glycerine, silicone, halocarbon; Warranty.
Pressure Gauge: A device that measures pressure or vacuum. There are many types of pressure gauges operating upon several different physical principles, depending upon the environment and the level of pressure being measured. All function by sensing the pressure level and converting this information by either analog or digital means into a visual readout.
Things to Consider: ANALOG (MECHANICAL) TYPE: Case construction typically propylene or stainless steel for industrial applications, aluminum or steel for construction or commercial applications; Mounting or retrofitting needs; Wetted parts and pressure medium materials; Connection and mounting requirements; Window styles choices of plastic, clear glass, or laminated glass; Ring styles choices: threaded, bayonet, friction, crimped and hinged; Pointer type choices: micro-adjustable for high quality and accuracy, friction type for adjustability and durability, plain non-adjustable for economical reliability; Accuracy expressed as percentage (plus or minus) of full scale (Pressure Gauge Standard ASME B40.100); Measurement range and dial (maximum operating pressure of application should not exceed 75% of full range); Environmental conditions; Liquid filling (glycerine/silicone prolongs life of gauge by minimizing wear from vibration or oscillation and is a permanent lubricant for the moving parts); Range; Units of measure; Figure intervals; Minor divisions; Size (diameter); Shipping weight; Warranty DIGITAL TYPE: Range (psi), Resolution, Media (dry, wet), Media chemical compatibility, Operating temperature range, Proof pressure, Burst pressure, Pressure connection, Gauge pressure, Compound ranges, Absolute pressure, Differential pressure, Vacuum, Battery power, Battery type, Battery life, Loop power, DC power, AC power, Backlit display, Selectable units, Bar Graph, Peak, Min/Max readings, Auto-off, NEMA case, Alarms, Analog output, NIST-traceable calibration certification, Materials, Dimensions, Warranty.
Chemical Process Pressure Gauge. These gauges operate like all other pressure gauges. They sense the pressure level, and use that input to operate a readout.The characteristic that differentiates them from other gauges is the requirement to operate in processing systems that handle chemicals such as, hydrocarbons, petrochemicals, solvents, organic and inorganic acids, halogens, salts, caustics, etc. Many of these devices are designed to handle a broad range of chemicals, but must be selected for the specific process.
Things to Consider: Range/Resolution, Static accuracy (% of full scale), Operating temperature range, Proof pressure, Burst pressure, Pressure connection, Battery, Battery life, Case dimensions, Case material, Wetted materials, Media compatibility, Warranty.
Chilled Water/Glycol Pressure Gauge. These gauges operate like all other pressure gauges. They sense the pressure level, and use that input to operate a readout.The characteristic that differentiates them from other pressure gauges is the requirement to operate in chilled water air conditioning systems that must cool below the freezing temperature of water. The gauge components that interface with the water/glycol media are usually made of copper.
Things to Consider: Range/Resolution, Static accuracy (% of full scale), Operating temperature range, Proof pressure, Burst pressure, Pressure connection, Battery, Battery life, Case dimensions, Case material, Wetted materials, Media compatibility, Warranty.
Clean Air/Gas Pressure Gauge: These gauges operate like all other pressure gauges. They sense the pressure level, and use that input to operate a readout. The characteristic that differentiates them from other gauges is the requirement that the piping components of the gauges be made of a material like ABS or stainless steel, that will not break or chip from decompressing air, and that will withstand temperature swings of 30° F and pressures up to 140 psi.
Things to Consider: Range/Resolution, Static accuracy (% of full scale), Operating temperature range, Proof pressure, Burst pressure, Pressure connection, Battery, Battery life, Case dimensions, Case material, Media compatibility, Warranty.
Instrument Air Pressure Gauge. These gauges operate like all other pressure gauges. They sense the pressure level, and use that input to operate a readout.The characteristic that differentiates them from other transmitters is the requirement that they operate in an instrument air environment with pressures from 90 to 150 PSI.
Things to Consider: Range/Resolution, Static accuracy (% of full scale), Operating temperature range, Proof pressure, Burst pressure, Pressure connection, Battery, Battery life, Case dimensions, Case material, Media compatibility, Warranty.
Sanitary Pressure Gauge. These gauges operate like all other pressure gauges. They sense the pressure level, and use that input to operate a readout.The characteristic that differentiates them from other pressure gauges is the requirement for extreme levels of cleanliness. They require special materials and have stringent cleaning requirements. Costly corrosion-resistant materials and special finishes are required for product contact areas, which must be cleanable and smoothly polished.
Things to Consider: Size, Wetted parts, Movement, Connection, Case materials, Ring materials, Window material, Liquid fill type (if applicable), Adjustable pointer, Dialface, Pressure range, Accuracy, Unit of measure, Maximum temperature, Wetted parts stainless steel, Weight, Warranty.
Pressure Switch: A device that senses a change in pressure of a gas or liquid and actuates an electrical switching element when a pre-set pressure point is reached.
Things to Consider: Switch type considerations of: poles, throw, normally open or closed; Approvals such as UL, CSA; Voltage and current limitations; Power consumption (for low differential pressure switches which operate on capacitive principle and use solid state circuitry to process pressure signal); Temperature range; Setpoint accuracy (at standard temperature); Repeatability; Hysteresis/Deadband; Materials of construction: body, diaphragm, contacts, springs, terminals, pressure connection, adjusting screw, media chemical compatibility; Cycling limitations (cycles/min) Dimensions; Weight; Enclosure or housing type (NEMA rating); Sensitivity to mounting position or shock/vibration; Warranty.
Chemical Process Pressure Switches. These switches operate like all other pressure switches. They make electrical contact when a certain set pressure has been reached at their input. The characteristic that differentiates them from other switches is the requirement to operate in processing systems that handle chemicals such as, hydrocarbons, petrochemicals, solvents, organic and inorganic acids, halogens, salts, caustics, etc. Many of these devices are designed to handle a broad range of chemicals, but must be selected for the specific process.
Things to Consider: Sensor technology type, Pressure reading criteria, Liquid to measure, Wetted parts materials, Chemical compatibility, Features criteria (Temperature output/Temperature compensation/Alarm indicator/TTL compatible switch), Display criteria, Working pressure range, Switch point range, Deadband, Accuracy, Operating temperature range, Signal output criteria, Scale units, Switch technology (Electro-mechanical/Solid state), Normally open or closed, Number of throws, Number of poles, Switched current, Switched AC or DC volts, Warranty.
Chilled Water/Glycol Pressure Switches. These switches operate like all other pressure switches. They make electrical contact when a certain set pressure has been reached at their input. The characteristic that differentiates them from other switches is the requirement to operate in chilled water air conditioning systems that must cool below the freezing temperature of water. The switch components that transport the water/glycol media are usually made of copper.
Things to Consider: Sensor technology type, Pressure reading criteria, Liquid to measure, Wetted parts materials, Chemical compatibility, Features criteria (Temperature output/Temperature compensation/Alarm indicator/TTL compatible switch), Display criteria, Working pressure range, Switch point range, Deadband, Accuracy, Operating temperature range, Signal output criteria, Scale units, Switch technology (Electro-mechanical/Solid state), Normally open or closed, Number of throws, Number of poles, Switched current, Switched AC or DC volts, Warranty.
Clean Air/Gas Pressure Switches. These switches operate like all other pressure switches. They make electrical contact when a certain set pressure has been reached at their input. The characteristic that differentiates them from other switches is the requirement that the piping components of the switches be made of a material like ABS or stainless steel, that will not break or chip from decompressing air, and that will withstand temperature swings of 30° F and pressures up to 140 psi.
Things to Consider: Sensor technology type, Pressure reading criteria, Features criteria (Temperature output/Temperature compensation/Negative pressure output/Alarm indicator/TTL compatible switch), Display criteria, Working pressure range, Switch point range, Deadband, Accuracy, Vacuum range, Vacuum switch setpoint range, Vacuum deadband, Operating temperature range, Signal output criteria, Scale units, Switch technology (Electro-mechanical/Solid state), Normally open or closed, Number of throws, Number of poles, Switched current, Switched AC or DC volts, Warranty.
Instrument Air Pressure Switches. These switches operate like all other pressure switches. They make electrical contact when a certain set pressure has been reached at their input. The characteristic that differentiates them from other switches is the requirement that they operate in an instrument air environment with pressures from 90 to 150 psi.
Things to Consider: Sensor technology type, Pressure reading criteria, Features criteria (Temperature output/Temperature compensation/Negative pressure output/Alarm indicator/TTL compatible switch), Display criteria, Working pressure range, Switch point range, Deadband, Accuracy, Vacuum range, Vacuum switch setpoint range, Vacuum deadband, Operating temperature range, Signal output criteria, Scale units, Switch technology (Electro-mechanical/Solid state), Normally open or closed, Number of throws, Number of poles, Switched current, Switched AC or DC volts, Warranty.
Sanitary Pressure Switch. These switches operate like all other pressure switches. They make electrical contact when a certain set pressure has been reached at their input. The characteristic that differentiates sanitary switches from other switches is the requirement for extreme levels of cleanliness. They require special materials and have stringent cleaning requirements. Costly corrosion-resistant materials and special finishes are required for product contact areas, which must be cleanable and smoothly polished.
Things to Consider: Sensor technology type, Pressure reading criteria, Liquid to measure, Wetted parts materials, Chemical compatibility, Features criteria (Temperature output/Temperature compensation/Alarm indicator/TTL compatible switch), Display criteria, Working pressure range, Switch point range, Deadband, Accuracy, Operating temperature range, Signal output criteria, Scale units, Switch technology (Electro-mechanical/Solid state), Normally open or closed, Number of throws, Number of poles, Switched current, Switched AC or DC volts, Warranty.
Pressure Transmitter: A device, also known as a pressure transducer, used to electronically convert the pressure of a gas or liquid in a vessel or pipe to an electronic signal. The electronic signal is then measured by an electronic sensor, or read by a computer to display, trend and/or alarm the operator.
Things to Consider: Accuracy (% Full scale); Pressure range min, max, units; Pressure type choices: gauge, absolute, differential, vacuum, bidirectional; Output (current or voltage), Wetted parts (diaphragm and fitting), Special features includes: lightening protection, triple range, barometer, cryogenic, duct pressure, frequency, high pressure, oil well tools, plastic melt, pneumatic, submersible, wireless; Excitation voltage; Zero balance; Linearity; Hysteresis; Repeatability; Sensing element construction; Electrical connection; Dimensions; Weight; Agency approvals; Warranty.
Chemical Process Pressure Transmitters. These transmitters operate like all other pressure transmitters. They sense the pressure level and convert that input to an electrical signal that can be used to operate a readout or other device. The characteristic that differentiates them from other transmitters is the requirement to operate in processing systems that handle chemicals such as, hydrocarbons, petrochemicals, solvents, organic and inorganic acids, halogens, salts, caustics, etc. Many of these devices are designed to handle a broad range of chemicals, but must be selected for the specific process.
Things to Consider: Electrical output choices, Sensor technology choices, Pressure reading choices, Working pressure range, Accuracy, Operating temperature range, Wetted parts materials, Chemical compatibilities, Display criteria, Features criteria (Temperature output/Temperature compensation/Alarm indicator/TTL compatible switch), Warranty.
Chilled Water/Glycol Pressure Transmitters. These transmitters operate like all other pressure transmitters. They sense the pressure level and convert that input to an electrical signal that can be used to operate a readout or other device. The characteristic that differentiates them from other transmitters is the requirement to operate in chilled water air conditioning systems that must cool below the freezing temperature of water. The transmitter components that interface with the water/glycol media are usually made of copper.
Things to Consider: Electrical output choices, Sensor technology choices, Pressure reading choices, Working pressure range, Accuracy, Operating temperature range, Wetted parts materials, Display criteria, Features criteria (Temperature output/Temperature compensation/Alarm indicator/TTL compatible switch), Warranty.
Clean Air/Gas Pressure Transmitter. These transmitters operate like all other pressure transmitters. They sense the pressure level, and convert that input to an electrical signal that can be used to operate a readout or other device. The characteristic that differentiates them from other transmitters is the requirement that the piping components of the transmitters be made of a material like ABS or stainless steel, that will not break or chip from decompressing air, and that will withstand temperature swings of 30° F and pressures up to 140 psi.
Things to Consider: Electrical output choices, Sensor technology choices, Pressure reading choices, Working pressure range, Vacuum range, Accuracy (ASME B40.1 and DIN accuracy grades), Operating temperature range, Display type, Features (Temperature output/Temperature compensation/Negative pressure output/Alarm indicator/TTL compatible switch), Warranty.
Instrument Air Pressure Transmitters. These transmitters operate like all other pressure transmitters. They sense the pressure level and convert that input to an electrical signal that can be used to operate a readout or other device. The characteristic that differentiates them from other transmitters is the requirement that they operate in an instrument air environment with pressures from 90 to 150 psi.
Things to Consider: Electrical output choices, Sensor technology choices, Pressure reading choices, Working pressure range, Vacuum range, Accuracy (ASME B40.1 and DIN accuracy grades), Operating temperature range, Display type, Features (Temperature output/Temperature compensation/Negative pressure output/Alarm indicator/TTL compatible switch), Warranty.
Sanitary Pressure Transmitter. These transmitter operate like all other pressure transmitters. They sense the pressure level and convert that input to an electrical signal that can be used to operate a readout or other device. The characteristic that differentiates them from other transmitters is the requirement for extreme levels of cleanliness. They require special materials and have stringent cleaning requirements. Costly corrosion-resistant materials and special finishes are required for product contact areas, which must be cleanable and smoothly polished.
Things to Consider: Electrical output choices, Sensor technology choices, Pressure reading choices, Working pressure range, Accuracy, Operating temperature range, Wetted parts materials, Display criteria, Features criteria (Temperature output/Temperature compensation/Alarm indicator/TTL compatible switch), Warranty.
