Categories from Ashcroft (15)

Process pressure gauges are built for chemical, petrochemical, refining and power plant service. Heavy-duty cases, stainless wetted parts and high accuracy give dependable readings in demanding environments.

Process Gauge Features

Solid-front safety cases – operator protection
316 stainless steel internals – corrosive media
Liquid filling – vibration and pulsation damping
Accuracy to 0.5% – precise readings
4.5" and 6" dials – easy reading

Choosing a Process Gauge

Choose range, accuracy, connection and materials suited to the process. Add diaphragm seals for corrosive, viscous or high-temperature media.

Centro supplies process gauges and accessories for plant instrumentation.

Pressure Switch

Pressure switches open or close an electrical contact when pressure reaches a set point. They start and stop pumps and compressors, trigger alarms and shut equipment down when pressure is unsafe.

Pressure Switch Types

Mechanical switches – simple, reliable and no power needed
Electronic switches – adjustable set points and displays
Differential pressure switches – filter and flow monitoring
Vacuum switches – vacuum system control
Explosion-proof switches – hazardous areas

Choosing a Switch

Select set point range, deadband, electrical rating and wetted materials. Fixed or adjustable deadband affects cycling. Add snubbers for pulsating systems.

Centro carries pressure switches for pumps, compressors and process safety.

Industrial Gauges

Industrial pressure gauges are built for the vibration, pulsation and rough handling found in plants, pump rooms and machinery. They give operators a dependable local reading of pressure in water, air, oil, steam and process lines.

Industrial Gauge Options

Stainless steel cases – corrosion resistance and durability
Liquid-filled gauges – dampen vibration and pulsation for steady readings
Brass and stainless internals – match media compatibility
Bottom and back connections – for line and panel mounting
Dial sizes from 2" to 6" – readable at a distance

Selecting a Gauge

Choose a range so normal operating pressure sits in the middle of the dial, generally about twice the operating pressure. Use a liquid-filled gauge on pumps and compressors, and add a snubber for pressure spikes. Confirm the connection size and accuracy grade.

Centro carries industrial pressure gauges for plant, process and equipment applications.

Bi-Metal Thermometers

Bimetal thermometers are widely used temperature measurement devices that employ a bimetallic strip to indicate temperature changes. These thermometers consist of two metal strips, typically made of different metals with different coefficients of thermal expansion, bonded together. The metals expand or contract at different rates as the temperature changes, causing the bimetallic strip to bend. This bending motion is then translated into a rotational movement displayed on a calibrated dial to indicate the temperature. Bimetal thermometers are known for their simplicity, durability, and cost-effectiveness. They are commonly used in various industries and applications requiring reliable temperature monitoring, such as HVAC systems, automotive, food processing, and industrial processes. Bimetal thermometers offer advantages such as wide temperature ranges, resistance to shock and vibration, and ease of installation. They are available in different sizes and configurations to suit specific application requirements. With their robust construction and accurate temperature indication, bimetal thermometers provide a reliable and cost-effective temperature measurement solution in various industrial and commercial settings.

Related categories: Thermometers | Industrial Thermometers

Temperature Switches

Temperature switches open or close a contact at a set temperature to start fans, stop heaters, trigger alarms or shut down equipment. They're simple, dependable temperature protection.

Switch Types

Mechanical switches – bulb and capillary or bimetal
Electronic switches – adjustable set points and displays
Limit switches – high-limit safety shutoff
Explosion-proof switches – hazardous areas

Choosing a Switch

Select range, deadband, contact rating and sensor style. Use thermowells for pressurized systems. Manual-reset limits add safety.

Centro supplies temperature switches for equipment protection and control.

Pressure Transducers

Pressure transducers convert pressure into an electrical signal for PLCs, data loggers and controls. They provide continuous monitoring of hydraulics, pneumatics, water systems, HVAC and process equipment.

Transducer Options

Output types – millivolt, 0-5 V, 0-10 V, 4-20 mA and digital
Gauge, absolute and sealed references – suited to the measurement
Stainless steel wetted parts – compatible with most media
Compact OEM transducers – high-volume machine builds
Hazardous area models – intrinsically safe and explosion-proof

Choosing a Transducer

Select a range so normal pressure sits around 50-75% of full scale, and consider accuracy, temperature effects and overpressure ratings. Protect against pressure spikes with snubbers. Match connectors and cable to the installation.

Centro carries pressure transducers for industrial, mobile and process applications.

Pressure Transmitters

Pressure transmitters send accurate pressure readings to your control system over long distances. They're the standard instrument for process monitoring, control loops and safety systems.

Transmitter Types

Gauge and absolute transmitters – line pressure measurement
Differential pressure transmitters – flow, level and filter monitoring
Smart transmitters – HART and digital communication
Remote seal transmitters – hot, viscous or corrosive media
Hazardous area models – explosion-proof and intrinsically safe

Choosing a Transmitter

Select range, accuracy, process connection and wetted materials. Consider output, display and approvals. Manifolds simplify installation and calibration.

Centro supplies pressure transmitters and manifolds for process measurement.

Related categories: Pressure Control | Pressure Regulators | Pressure Switch | Sequence Valves | Gauges

Commercial Gauges

Commercial pressure gauges cover HVAC, plumbing, fire protection and general building services. They're economical, easy to read and available in many standard ranges.

Commercial Gauge Options

Dry and liquid-filled gauges – general service
Brass internals – water, air and oil
Common dial sizes – 2" to 4"
Bottom and back connections – line or panel mounting
Fire protection gauges – sprinkler system ratings

Choosing a Gauge

Select a range about twice normal operating pressure, and match connection size and dial type. Liquid-filled gauges handle vibration from pumps.

Centro supplies commercial gauges for HVAC, plumbing and building systems.

Diaphragm Seals

Diaphragm seals are devices that seal pressure transmitters to prevent process fluid from coming into contact with the inner workings of the transmitter. Our diaphragm seals are made from high-quality rubber resistant to wear and tear. They are available in various sizes to fit most pressure transmitters. Centro supplies threaded, flanged, sanitary and in-line diaphragm seals, and can help you choose the right seal and fill fluid for your gauge or transmitter. In addition, we offer a wide range of accessories for diaphragm seals, including replacement diaphragms, o-rings, and mounting brackets. Whether you need a single diaphragm seal or a complete Diaphragm Seal kit, we have the products to keep your pressure transmitter working correctly.

Related categories: Seals | Capillaries | Seal Accessories | Isolation Rings | O-Rings

Pressure Control Accessories

Pressure control accessories protect instruments, simplify maintenance and make pressure measurements more accurate. Syphons, snubbers, manifolds and valves are essential to a dependable gauge or transmitter installation.

Accessories Available

Pressure snubbers – dampen pulsation and spikes
Syphons – protect gauges from live steam
Manifold valves – isolate and equalize transmitters
Gauge cock and instrument valves – isolate instruments for service
PT plugs – quick test ports for pressure and temperature checks

Building an Installation

A typical gauge installation includes an isolation valve, a protection device (snubber or syphon) and the gauge itself. Choose materials compatible with the media and pressure ratings above system maximum.

Centro carries pressure control accessories to complete and protect your instrument installations.

Related categories: Pressure Control | Gauges | Pressure Transducers | Pressure Switch | Pressure Transmitters

Test Gauges

Test gauges, also called calibration gauges, provide high-accuracy readings for checking and calibrating other instruments. They're essential tools for maintenance and instrument technicians.

Test Gauge Options

Analog test gauges – 0.25% accuracy with mirror dials
Digital test gauges – high accuracy and data logging
Wide range selections – vacuum to high pressure
Calibration certificates – traceable documentation

Choosing a Test Gauge

Select accuracy at least four times better than the instruments you're testing. Choose range and connection to match. Handle and store test gauges carefully to protect accuracy.

Centro supplies test gauges for calibration and verification.

Sanitary Gauges

Sanitary gauges measure pressure in food, beverage, dairy and pharmaceutical processes while meeting hygienic design standards. Diaphragm seals with tri-clamp connections keep product from collecting in the instrument.

Sanitary Gauge Features

Tri-clamp connections – quick removal for cleaning
Polished stainless steel – hygienic surfaces
FDA-approved fill fluids – food safety
3-A compliant designs – sanitary standards
CIP/SIP capable – withstand cleaning and sterilization

Choosing a Gauge

Select range, connection size, fill fluid and temperature rating. Confirm compatibility with CIP chemicals and sterilization temperatures.

Centro supplies sanitary gauges for hygienic processes.

Thermowells

Thermowells protect temperature sensors from pressure, flow, corrosion and abrasion. They also let you remove sensors for replacement or calibration without draining or shutting down the process.

Thermowell Types

Threaded thermowells – common for general service
Socket weld and weld-in – high-pressure installations
Flanged thermowells – easy removal and corrosive service
Sanitary thermowells – tri-clamp for food and pharma
Tapered and stepped stems – strength and fast response

Choosing a Thermowell

Select material, insertion length, bore size and connection. For high-velocity flows, perform a wake frequency calculation to avoid stem failure.

Centro supplies thermowells for temperature sensors and thermometers.

Diaphragm Seals

Diaphragm seals protect pressure gauges, switches and transmitters from corrosive, viscous, hot or clogging process media. A flexible diaphragm transfers pressure through a fill fluid so the instrument never touches the process.

Diaphragm Seal Types

Threaded seals – general-purpose protection
Flanged seals – larger connections and higher pressures
Sanitary seals – tri-clamp for food and pharma
In-line seals – slurries and flowing media
Capillary systems – remote mounting

Choosing a Seal

Select diaphragm material, fill fluid and connection for your process. Consider temperature effects and instrument range. Assemblies are often filled and calibrated as a unit.

Centro supplies diaphragm seals and can help you choose the right seal and fill fluid for your instrument.

Related categories: Seals and Accessories | Capillaries

Temperature Accessories

Temperature accessories help your sensors and instruments read accurately and last longer. Thermowells, fittings, connection heads and extension wire protect sensors from the process and make installation and replacement simpler.

Accessories Available

Thermowells – threaded, socket weld and flanged wells protect sensors from pressure and flow
Compression fittings – adjustable sensor insertion depth
Connection heads – house terminal blocks and head-mount transmitters
Thermocouple and RTD extension wire – carry signals back to the controller
Connectors and plugs – quick disconnects for sensors

Choosing Accessories

Select thermowell material and length for the process, with the tip in the flow, and check the wake frequency calculation for high-velocity lines. Use extension wire that matches the thermocouple type to avoid reading errors. Head and enclosure ratings should match the environment.

Centro carries temperature accessories to complete your sensor installations.

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Categories from Ashcroft (15)

Process Gauge Features

Choosing a Process Gauge

Pressure Switch Types

Choosing a Switch

Industrial Gauge Options

Selecting a Gauge

Switch Types

Choosing a Switch

Transducer Options

Choosing a Transducer

Transmitter Types

Choosing a Transmitter

Commercial Gauge Options

Choosing a Gauge

Accessories Available

Building an Installation

Test Gauge Options

Choosing a Test Gauge

Sanitary Gauge Features

Choosing a Gauge

Thermowell Types

Choosing a Thermowell

Diaphragm Seal Types

Choosing a Seal

Accessories Available

Choosing Accessories

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