Pressure Instruments

Pressure Instruments for measuring the pressure of a substance are an integral part of the manufacturing process. Obtaining accurate and meaningful data is important in determining the quality and consistency of the product. For these reasons, accurate sensors are critical in obtaining this information.

Pressure Quick-Test System
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Pressure Quick-test System - Overview

The Ralston Quick-test™ system of low volume, high-pressure hoses, corresponding fittings, and adapters is a game-changer. With max pressure ranges over 350 Bar, Ralston Quick-test™ connections outperform other quick connections with adaptors to most standard connections. Also available in the Quick-test XT™ that handles up to 700 Bar.

Pressure Quick-test System - Features
- Secure, leak-free connections every time
- Any standard pressure connection can be converted to a Quick-test fitting
- It saves hours of wasted time thread-taping and searching for wrenches
- The system safely self-vents while still threaded during disconnection, preventing blowoffs
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Benchtop Manifolds up to 350 Bar | MF
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Benchtop Manifolds 350 Bar - Overview

The Benchtop Manifolds 350 Bar is ideal for testing multiple pressure instruments at once of up to 5000 psi (350 bar) and includes Quick-test connections. Quick-test™ hose is unique because it can be attached and detached without a wrench or thread sealant while maintaining a working pressure of 6900 psi (475 bar). This means there is no requirement for sealing tape on the manifold with hand-tightened quick connections making it extremely easy to work with.

Benchtop Manifolds 350 Bar - Features
- Calibrate multiple pressure gauges, transmitters, or transducers at once
- Vertically mounted ports are spaced far enough apart so larger gauges will fit easily
- Quickly pressurise the system using a Ralston Quick-test hose
- Switch between pressure connections on devices under test without a wrench
- Compatible with all Ralston Quick-test NPT, BSP, Flare Gauge Adapters
- Excellent for calibrating multiple pressure instruments in a thermal chamber
- The second side connection can be used to daisy-chain multiple manifolds together
2-port Datasheet 4-port Datasheet

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Benchtop Manifolds up to 700 Bar | MF
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Benchtop Manifolds up to 700 Bar - Overview

This Benchtop Manifolds Bar is ideal for testing multiple pressure instruments at once of up to 10 000 psi (700 bar) and comes with Quick-test XT connections. Quick-test XT hose is unique because it can be attached and detached without a wrench or thread sealant while maintaining a working pressure of 10,000 psi (689 bar). This means no sealing tape on the manifold is needed, with hand-tighten quick connections making it extremely easy to work with.

Benchtop Manifolds up to 700 Bar - Features
- Calibrate multiple pressure gauges, transmitters, or transducers at once
- Vertically mounted ports are spaced far enough apart so larger gauges will fit easily
- Quickly pressurise the system using a Ralston Quick-test hose
- Switch between pressure connections on devices under test without a wrench
- Compatible with all Ralston Quick-test NPT, BSP, Flare Gauge Adapters
- Excellent for calibrating multiple pressure instruments in a thermal chamber
- The second side connection can be used to daisy-chain multiple manifolds together
2-port Datasheet 4-port Datasheet

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Compressed Gas Volume Controllers | QTVC
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Compressed Gas Volume Controllers - Overview

The Compressed Gas Volume Controller QTVC performs ultra-precise low-pressure differential or high-pressure static pressure calibrations with nitrogen, using the same device with an external pressure calibrator with extreme precision.

Compressed Gas Volume Controllers - Features
- Proprietary pressure balanced fine adjustment piston allows for extremely precise, finger-tip control of pressure from 0.03 psi (2 mbar) to 3000 psi (210 bar)
- Fine adjust piston, fill, balance, and vent valves are in one lightweight, compact unit
- Includes Quick-test System™ outlet connections, hoses, and adapters
- Low volume Quick-test hose, gauge adapter and process connection can be attached to QTVC without thread sealant or a wrench
- Soft-seated valves make filling and venting the system very precise
- Included stand for laboratory or tabletop use (QTVC-LKIT)
- Optional padded strap for field use (NPAK-STRP)
QTVC Datasheet

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ControlPak Manual Pressure Controller | QTVC-EN
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ControlPak Manual Pressure Controller - Overview

The ControlPak Manual Pressure Controller is a manual pressure controller designed for precise control over an external compressed gas source, either in the field or in the lab. With its integrated volume controller, it allows the user to manually adjust compressed gas pressure with the utmost precision and at a fraction of the cost of electronic pressure controllers. With a large pressure-balancing piston, the ControlPak Manual Pressure Controller has an impressive turndown. In a single setup, a tech can perform ultra-precise low-pressure differential or high-pressure static pressure calibrations with extreme precision. The pressure-balanced fine adjustment piston allows finger-tip control of pressure from 0.03 psi (200 Pa) to 3000 psi (20 MPa).

ControlPak Manual Pressure Controller - Features
- Proprietary, pressure-balanced fine adjustment piston allows for extremely precise, control of pressure from 0.03 psi (200 kPa) to 3000 psi (20 MPa)
- Fine adjust piston, fill, balance, and vent valves are all included in one light-weight, compact unit
- Includes handle, Ralston Quick-test ™ fill valve and outlet connections, hoses, and adapters
- Low volume Quick-test hose, gauge adapter, and process connection can be attached to ControlPak without thread sealant or a wrench
- Soft-seated valves make filling and venting the system very precise
Datasheet

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Differential Pressure Transmitter | PHD330
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Differential Pressure Transmitter - Overview

This differential pressure transmitter is designed according to the MEMS hot wire anemometer technology. This has very good zero point stability and small differential pressure detection capability, as well as high-pressure resistance. The transmitter, using the pressure difference, passes a very small amount of gas through the airflow channel of the sensor. Combined with the integrated circuit, it converts into a differential pressure signal.

Differential Pressure Transmitter - Features
- Low-pressure monitoring, high-pressure resistance
- Silicon chips on differential pressure module of MEMS integration technology
- RS-485 communication interface (Optional), Modbus RTU protocol
- Physical unit switch (User Interface): mbar / mmWS / inH2O / mmHg/ Pa / hPa / kPa / mmH2O
- Square root function
- Offset function / UI software
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Digital Calibration Pressure Gauge High Accuracy | LC30
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Digital Calibration Pressure Gauge - Overview

An affordable panel-mounted pressure gauge with high-end features. It has ± 0.1% of full-scale accuracy. The instrument is tough and reliable, with customisable options to help you simplify your work. It gets the job done quickly and accurately. The pressure gauge is compact with a large, easy-to-read display showing numbers and bar graphs clearly. The controls are clear and intuitive, minimising guesswork. The instrument maintains calibration through shock, vibration, and abuse, and will even stay calibrated if the battery dies. The Process Digital Pressure Gauge allows you to switch easily from among 15 standard engineering units and you can create custom engineering units, remove unneeded units, and configure other settings. This allows you to truly customise the gauge to your needs, displaying only those units necessary for your application. Another benefit is that this device is waterproof up to 1 meter (IP67), and there are no mechanical parts that'll wear out and need to be replaced over time because it's digital.

Digital Calibration Pressure Gauge - Features
- Quick, reliable Zero function using a single button
- +/-0.1% full scale accuracy (ASME Grade 4A / ISO Class 0.1)
- Back-mounted pressure sensors - Make for easy panel mount installation
- Mounting flange - Allows for installation in the control panel without taking up too much room
- Large, easy-to-read display with intuitive controls and bright backlight
- Exceptional durability - rugged and waterproof to 1 meter (IP67)
- Added customisation - easily switch from among 15 standard engineering units
- Option to add your own and remove unneeded units
- AC mains powered with battery backup
- Convenient High / Low function that allows the user to see the highest and lowest pressure reached
- USB connection to connect to calibration management software for live viewing of pressure, customization of engineering units, and calibration
- Available in 11 pressure ranges from 5 psi / 35 kPa to 10,000 psi / 70 Mpa, a compound vacuum/pressure gauge from negative to positive 15 psi, and a digital vacuum gauge measuring up to 30 inHg / 760 mbar
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Digital Pressure Calibration Gauge | LC10
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Digital Pressure Calibration Gauge - Overview

The Digital Pressure Calibration Gauge LC10 is an affordable pressure gauge with high-end features. The instrument is compact but has a large, easy-to-read display showing numbers and bar graphs clearly. The instrument is tough and reliable, with customisable options to help you simplify your work. It gets the job done quickly and accurately. The controls are clear and intuitive, minimising guesswork. Unlike analogue gauges, the instrument maintains calibration through shock, vibration, and abuse, and will even stay calibrated if the battery dies. The Digital Pressure Calibration Gauge LC10 allows you to switch easily from among 15 standard engineering units, and you can create custom engineering units, remove unneeded units, and configure other settings easily. Truly customise the gauge to your needs, displaying only those units necessary for your application. It's waterproof up to 1 meter (IP67), and because it's digital, there are no mechanical parts that'll wear out and need to be replaced over time. Its rugged aluminium case and built-in screen protector keep the internal components safe, so you can toss it in your bag, drop it, or leave it out in the rain, and it will maintain its accuracy.

Digital Pressure Calibration Gauge - Features
- Increased visibility - large, easy-to-read display with intuitive controls and bright backlight
- Exceptional durability - withstands abuse and cracking and is waterproof to 1 meter (IP67)
- Added customisation - easily switch from among 15 standard engineering units with the option to add your own and remove unneeded units
- Quick, reliable Zero function using a single button
- Convenient High / Low function that allows the user to see the highest and lowest pressure reached
- USB connection to connect to calibration management software for live viewing of pressure, customization of engineering units, and calibration
- +/-0.25% full scale accuracy (ASME Grade 3A / ISO Class 0.25)
- Available in 11 pressure ranges from 5 psi / 35 kPa to 10,000 psi / 70 Mpa, a compound vacuum/pressure gauge from negative to positive 15 psi, and a digital vacuum gauge measuring up to 30 inHg / 760 mbar
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Digital Pressure Calibrator Display | FieldLab
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Digital Pressure Calibrator Display - Overview

The Digital Pressure Calibrator is a safe device designed to work on site. It is certified Intrinsically Safe for hazardous locations anywhere in the world. Pressure safety valve crack tests and seat tightness tests can be performed with precision while generating solid data to back up your observations. Single-button logging of both Devices Under Test (DUT) and Reference readings allow techs to get digital logging of test points and instant tolerance feedback. The Fieldlab Test Modes easily create Test Modes for the work that needs to be done and how you want your data returned. Activate your custom Test Mode on your FieldLab to ensure repeatability and traceability. The Pressure Calibrator Display comes with all standard engineering units used to measure pressure or vacuum and can instantly swap units without searching through menus. For general purpose data logging, the instrument can monitor pressure over short or very long periods at customised intervals.

Digital Pressure Calibrator Display - Features
- Customise Log Interval & Duration
- Long Term Field Monitor (3 months on a single charge)
- 2 Million Data Points Onboard Storage
- Wellhead Monitoring
- Chart Recorder Replacement
Pressure Range Options
- 5 psi / 350 mbar / 35 kPa = GB
- 15 psi / 1 bar / 100 kPa = GD
- 30 psi / 2 bar / 200 kPa = GF
- 50 psi / 3.5 bar / 350 kPa = GH
- 100 psi / 7 bar / 700 kPa = GJ
- 300 psi / 20 bar / 2 MPa = GL
- 500 psi / 35 bar / 3.5 MPa = GN
- 1,000 psi / 70 bar / 7 MPa = GP
- 3,000 psi / 200 bar / 20 MPa = GR
- 5,000 psi / 350 bar / 35 MPa = GT
- 10,000 psi / 700 bar / 70 kPa = GV
Process Connection Options

¼" Male BSPP = 2B
¼" Male NPT = 2M
Ralston Male Quick-test™ = QM
Ralston Male Quick-test™ XT = XM

Accessories

Wireless Module = W1
WeatherProof Enclosure = E0
WeatherProof Enclosure with pole mounting hard = EH
Solar Panel = SP

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Gas Sampling Pump | SP0V
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Gas Sampling Pump - Overview

The SP0V gas sampling pump can pull low-pressure gas from a well and boost it to 25 psi to pump it into a sample cylinder.

Gas Sampling Pump - Features
- Hard-Anodised aluminium body and stainless steel fittings so no issues with corrosion, cracking or cross-contamination of the sample
- Inlet and outlet hose has Nylon inner core tube which does not affect the sample
- Low compression rate will not adversely affect the sample by bringing the gas close to the hydrocarbon dew point (25 psi/2 bar)
- Hydrocarbon-free lubricant does not contaminate the sample with any foreign hydrocarbons
- Designed in accordance with API MPMS Chapter 14.1 on natural gas sampling
- Ideally suited for use with the purge and fill method of gas sampling
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Hand-Held Compressed Gas 350 Bar | QSCM
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Hand-Held Compressed Gas - Overview

The static pressure calibration process has been greatly simplified with the revolutionary Ralston Hand-Held Compressed Gas 350 Bar QSCM. This unique hand-held pressure controller provides exceptional control right where you need it most - directly at the device under test. The most economical way of performing static pressure calibrations in the field using nitrogen or other compressed gas.

Hand-Held Compressed Gas - Features
- Fine adjustment piston with soft-seated valves allow for ultra-precise pressure control.
- Compact, portable design requires minimum space for operation.
- Stainless steel, for pressure calibration from 0 to 5000 psi
- Calibration of static or high side of differential pressure (DP) transmitter
- Testing of analogue gauges on gas wellheads up to 5000 psi
- Verification of analogue or digital pressure devices in the field up to 5000 psi
- The fine adjust piston, along with precision fill and vent valves, allows the technician to quickly reach the test points required to perform static calibrations with less effort and more accuracy.
- Features Ralston Quick-test fittings, hoses, and adapters for no-tool, no thread tape, and leak-free connections.
Datasheet

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Hand-Held Gas Calibration Manifold 200 Bar | QTCM
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Hand-Held Gas Calibration Manifold - Overview

The static pressure calibration process has been greatly simplified with the revolutionary Ralston Hand-Held Gas Calibration Manifold 200 Bar. This unique, hand-held pressure controller provides exceptional control right where you need it most - directly at the device under test. The most economical way of performing static pressure calibrations in the field using nitrogen or other compressed gas.

Hand-Held Gas Calibration Manifold - Features
- Fine adjustment piston with soft-seated valves allow for ultra-precise pressure control
- Compact, portable design requires minimum space for operation
- Solid brass, for pressure calibration from 0 to 3000 psi
- Calibration of static or high side of differential pressure (DP) transmitter
- Testing of analogue gauges on gas well heads up to 3000psi
- Verification of analogue or digital pressure devices in the field up to 3000psi
- The fine adjust piston, along with precision fill and vent valves, allows the technician to quickly reach the test points required to perform static calibrations with less effort and more accuracy
- Features Ralston Quick-test fittings, hoses, and adapters for no-tool, no thread tape, and leak-free connections
Datasheet

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High Accuracy Calibration Pressure Gauge | LC20
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Calibration Pressure Gauge - Overview

The High Accuracy Calibration Pressure Gauge has all the toughness and portability of the LC10 model but with an impressive ± 0.1% of full-scale accuracy. It’s the reference-grade gauge you can take with you anywhere. Perform logging and live viewing of pressure via USB, or choose the wireless option and monitor tests from the comfort of your truck. The High Accuracy Calibration Pressure Gauge allows you to switch easily from among 15 standard engineering units (similar products only allow two) and you can create custom engineering units, remove unneeded units, and configure other settings easier than ever. It is ideal for general pressure monitoring and calibration of analogue pressure gauges and transmitters.

Calibration Pressure Gauge - Features
- Increased visibility - large, easy-to-read display with intuitive controls and bright backlight
- Exceptional durability - withstands abuse and cracking and keeps the internal components functioning with extreme precision, even in extreme conditions
- Waterproof to 1 meter (IP67)
- Added customisation - easily switch from among 15 standard engineering units with the option to add your own and remove unneeded units
- Quick, reliable Zero function using a single button
- Instantly cycle between the high, low and current pressure reading with the Hi/Lo button
- Connect to a PC via USB or wireless to change settings or to perform data logging.
- ± 0.1% full scale accuracy (ASME B40.100 Grade 4A/ISO Class 0.1)
- Available in 11 pressure ranges from 5 psi / 35 kPa to 10,000 psi / 70 Mpa, a compound vacuum/pressure gauge from negative to positive 15 psi, and a digital vacuum gauge measuring up to 30 inHg / 760 mbar
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High-Pressure Hydraulic Hand Pump 350 Bar | QTHP
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High-Pressure Hydraulic Hand Pump - Overview

The sleek design of the High-Pressure Hydraulic Hand Pump 350 bar allows you to test pressures up to 5000 psi without having to lock a stroke-limiting knob. It’s compact and easy to use. As it’s machined from solid stainless steel, it provides steady, stable pressure with absolute precision.

High-Pressure Hydraulic Hand Pump - Features
- Pressure transmitter calibration
- Pressure gauge calibration
- Field testing where power inputs are unavailable or unsuitable
- Pressure switch testing
- Leak testing pressure instruments
- Lightweight and easy to use
- Extremely durable — resistant to shock, extreme temp, and chemical exposure
- Easy to disassemble and repair with standard hand tools
- Machined from solid, stainless steel preventing pressure leaks
- Includes Ralston Quick-test adapters and hoses for quick & efficient connection
- Compatible with most liquids
- The pump comes fitted with a fill plug with over-pressure relief for easy setup
Datasheet

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High-Pressure Hydraulic Hand Pump 700 Bar | XTHP
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High-Pressure Hydraulic Hand Pump 700 Bar XTHP Overview

The High-Pressure Hydraulic Hand Pump 700 XTHP is a powerful hand-operated hydraulic pump that can quickly generate high pressure up to 10,000 psi / 70 MPa without having to lock a stroke limiting knob. It’s compatible with most fluid media and provides consistent, steady pressure - even when subjected to temperature fluctuations, shocks, impacts, and hazardous chemicals. Solid, stable pressure up to 10 000 psi / 70 MPa.

High-Pressure Hydraulic Hand Pump 700 Bar Features
- Balanced Construction
  With the pressurized section located below the reservoir, the XTHP manual hydraulic pump is much easier to handle than similar hand-operated hydraulic pumps. It’s not top-heavy - you can even hold it and pump with one hand.
- Durable Design
  The XTHP is a manual hydraulic pump that’s built to last. Its stainless steel components prevent leaks that are common in cast material, and it includes a shock-resistant reservoir, Viton o-ring seals that are impervious to harmful chemicals, and sturdy metal handles that won’t wear out or break when dropped.
- Stable Pressure
  It's machined from solid stainless steel, preventing leaks and ensuring consistent, steady test pressure.
- Quick Priming Piston
  Quickly fill the system with fluid media, then easily switch back to the high-pressure piston, saving time and muscle.
- High-Pressure Fittings
  Includes Ralston Quick-test XT 10,000 psi hose and adapters for fast, safe high-pressure connections without a wrench or thread tape.
- Pressure calibration testing on gauges, transmitters, flow computers & chart recorders
- Pressure switch testing
- Testing liquid PSVs in the field
- Field testing where power inputs are unavailable or unsuitable
Datasheet

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