Fluke Calibration RPM4 is a precise reference pressure monitor for demanding pressure calibration, testing and measurement applications. Designed for professional calibration laboratories, research facilities and industrial metrology, the RPM4 combines high-performance pressure measurement with exceptional range flexibility, advanced automation functions and robust protection of its internal reference pressure transducers.
At the heart of the Fluke Calibration RPM4 are independent Q-RPT Quartz Reference Pressure Transducer modules. Depending on the selected configuration, the RPM4 covers pressure ranges from 15 kPa / 2.2 psi compound gauge up to 280 MPa / 40,000 psi. Measurement uncertainty can be as low as ±0.008% of reading, making the RPM4 suitable for use as a high-level reference pressure monitor and transfer standard.
A major advantage of the Fluke Calibration RPM4 is its modular configuration. The instrument can be equipped with different Q-RPT ranges and classes to match the required pressure calibration application. Single-channel and dual-channel configurations are possible, while external Q-RPT modules can further expand the system.
Fluke Calibration’s Infinite Ranging™ and AutoRange™ functions allow the RPM4 to optimize its measurement characteristics for the actual pressure range being used. This makes it possible to cover multiple devices under test and pressure ranges with a single reference pressure monitor.
The Fluke Calibration RPM4 also incorporates advanced functions such as AutoZero and the SDS™ Self Defense System. SDS™ protects compatible Q-RPT modules against accidental overpressure by automatically isolating the sensitive reference transducer when required.
RS232 and IEEE-488 communication interfaces allow the RPM4 to be integrated into automated pressure calibration systems. An optional battery pack and rack mounting accessories further increase flexibility for laboratory and transfer-standard applications.
At europascal, the Fluke Calibration RPM4 can be combined with suitable pressure generation and control equipment to create a complete professional pressure calibration solution. For calibration and metrological traceability, visit the europascal Calibration Service.
Your Benefits at a Glance
The Fluke Calibration RPM4 provides a versatile combination of high precision, wide pressure coverage and advanced reference pressure measurement functions.
Key benefits include:
- High-precision reference pressure monitoring
- Q-RPT Quartz Reference Pressure Transducer technology
- Pressure ranges from 15 kPa compound gauge
- Maximum pressure up to 280 MPa / 40,000 psi
- Measurement uncertainty as low as ±0.008% of reading
- Single-channel and dual-channel configurations
- Standard and Premium Q-RPT configurations
- Independent Q-RPT modules
- Infinite Ranging™ technology
- AutoRange™ functionality
- AutoZero functionality
- SDS™ Self Defense System
- Automatic protection of compatible Q-RPT modules
- Resolution down to 1 ppm
- Gauge and absolute pressure configurations
- Automated leak testing
- Pressure rate measurement
- Pressure averaging
- High and low pressure monitoring
- Remote operation
- RS232 communication
- IEEE-488.2 communication
- External Q-RPT support
- Optional battery pack
- Optional 19-inch rack mounting
- Suitable for automated calibration systems
- Compact and rugged construction
- Professional reference and transfer-standard applications
Wide Pressure Range
One of the most important advantages of the Fluke Calibration RPM4 is its exceptionally wide range of available pressure configurations.
Depending on the selected Q-RPT modules, the RPM4 platform covers pressure ranges from:
15 kPa / 2.2 psi compound gauge
up to:
280 MPa / 40,000 psi.
This allows the RPM4 platform to be configured for low-pressure, medium-pressure and very high-pressure measurement applications.
Instead of designing the instrument around a single fixed pressure range, Fluke Calibration offers a variety of Q-RPT modules that can be selected according to the required application.
Q-RPT Technology
The measurement performance of the Fluke Calibration RPM4 is based on Fluke Calibration’s:
Q-RPT Quartz Reference Pressure Transducer technology.
Q-RPTs are high-performance reference pressure transducers developed specifically for precision pressure metrology.
Each Q-RPT is individually characterized to provide the stability, repeatability and precision required for demanding calibration applications.
This technology allows the RPM4 to function as a reference pressure monitor rather than simply an industrial pressure indicator.
Measurement Uncertainty
Depending on the selected Q-RPT configuration, the Fluke Calibration RPM4 provides measurement uncertainty as low as:
±0.008% of reading.
The exact uncertainty depends on factors including:
- Q-RPT pressure range
- Q-RPT class
- Single or dual-channel configuration
- Measurement mode
- AutoZero conditions
- Calibration configuration
The specification of the exact RPM4 configuration should therefore always be considered when establishing the measurement uncertainty budget for a calibration.
Single and Dual Q-RPT Configurations
The Fluke Calibration RPM4 can be configured with:
one Q-RPT
or:
two Q-RPTs.
A single-channel configuration provides a compact reference solution for a defined pressure range.
A dual-channel RPM4 can combine different pressure ranges within one instrument.
This allows the user to optimize reference measurement performance over a wider working range.
In suitable configurations, parallel measurement using two comparable Q-RPTs can also provide additional confidence in reference pressure measurement.
Infinite Ranging™
The Fluke Calibration RPM4 features:
Infinite Ranging™.
Traditional pressure reference instruments are often specified primarily against their full-scale pressure range.
This can become disadvantageous when the device under test has a substantially lower range than the reference.
Infinite Ranging™ is designed to optimize RPM4 measurement performance for the actual working range.
This makes the RPM4 particularly versatile when a calibration laboratory must handle devices with many different pressure ranges.
AutoRange™
The AutoRange™ function simplifies configuration of the Fluke Calibration RPM4.
At the beginning of a test, the operator can define the required pressure range and operating conditions.
The RPM4 can then configure relevant measurement functions for the selected range.
Depending on configuration, AutoRange™ can optimize parameters such as:
- Active Q-RPT
- Measurement mode
- Display resolution
- Pressure limits
- Measurement characteristics
This reduces setup effort and makes it easier to use the RPM4 efficiently across different calibration ranges.
AutoZero
Precision pressure measurement requires reliable control of zero behavior.
The Fluke Calibration RPM4 therefore incorporates:
AutoZero.
AutoZero allows the Q-RPT measurement to be regularly referenced using an appropriate zero or reference condition.
This helps maintain the high measurement performance of the pressure monitor between calibrations.
The specific AutoZero method depends on the Q-RPT configuration and measurement mode.
SDS™ Self Defense System
The Q-RPTs used in the Fluke Calibration RPM4 are precision reference transducers.
To protect compatible Q-RPT modules from accidental excessive pressure, Fluke Calibration developed the:
SDS™ Self Defense System.
Each applicable Q-RPT module has its own protection system.
When necessary, SDS™ isolates the sensitive reference pressure transducer from excessive pressure.
This is particularly valuable in calibration laboratories where different pressure ranges are frequently connected to the same measurement system.
Reference Pressure Monitor
The Fluke Calibration RPM4 is a:
Reference Pressure Monitor.
This distinction is important.
The RPM4 measures pressure with high precision but does not independently generate or automatically regulate the applied test pressure.
A typical calibration system therefore consists of:
Pressure Source + Fluke Calibration RPM4 + Device Under Test
The pressure source generates the test pressure.
The RPM4 measures the reference pressure.
The device under test is exposed to the same pressure.
The DUT indication can then be compared directly with the RPM4 reference value.
Manual Pressure Calibration
The Fluke Calibration RPM4 can be combined with a suitable manual pressure generator.
Depending on the required pressure range, this may be a:
- Pneumatic hand pump
- Hydraulic hand pump
- Pressure comparator
- Gas pressure generator
- Piston gauge system
The pressure generator is used to establish the required test pressure while the RPM4 provides the precision reference measurement.
This creates a flexible comparison calibration system.
Automated Pressure Calibration
The Fluke Calibration RPM4 is also particularly suitable for automated calibration systems.
Instead of a manual pressure generator, the RPM4 can be integrated with compatible automated pressure generation and control equipment.
The pressure controller generates and stabilizes the pressure while the RPM4 provides the independent reference measurement.
This architecture can be particularly useful for high-performance calibration systems where pressure generation and reference measurement are intentionally separated.
Pressure Gauge Calibration
The Fluke Calibration RPM4 can be used as a reference for calibration of analog and digital pressure gauges.
A suitable pressure source applies the same pressure to the RPM4 and the device under test.
Typical calibration points may be approached in increasing and decreasing pressure sequences.
The difference between the DUT indication and the RPM4 reference value can then be determined at each calibration point.
Pressure Transmitter Calibration
Pressure transmitters can also be calibrated using the RPM4.
A typical system consists of:
Pressure Generator + Fluke Calibration RPM4 + Electrical Calibrator + Pressure Transmitter
The RPM4 measures the applied pressure.
An electrical calibrator measures the transmitter output, typically a:
4 to 20 mA signal.
This allows the complete pressure-to-current characteristic of the transmitter to be evaluated.
Pressure Sensor Calibration
The Fluke Calibration RPM4 is also suitable as a reference for pressure sensor and pressure transducer calibration.
Depending on the installed Q-RPT range, sensors from low pressure to very high pressure can be compared against the RPM4 reference.
This makes the modular RPM4 platform useful for laboratories calibrating a wide variety of pressure measuring instruments.
Absolute and Gauge Pressure
Different Q-RPT configurations support different pressure measurement modes.
Depending on the installed module, the Fluke Calibration RPM4 can be configured for:
- Gauge pressure
- Absolute pressure
- Compound gauge pressure
This flexibility allows the RPM4 to be adapted to a broad spectrum of pressure calibration tasks.
Low-Pressure Applications
Special RPM4 configurations are available for low-pressure applications.
The RPM4 family includes solutions extending down to:
15 kPa compound gauge.
Fluke Calibration also offers the dedicated:
RPM4-LP Low Pressure Monitor
for specialized low-pressure applications.
This demonstrates the broad pressure measurement architecture available within the RPM4 family.
High-Pressure Applications
At the other end of the range, RPM4 configurations extend to:
280 MPa / 40,000 psi.
This makes the platform suitable for demanding high-pressure reference applications.
The appropriate Q-RPT, pressure medium, tubing, fittings and pressure generation equipment must always be selected according to the required operating pressure.
Pressure Rate Measurement
The Fluke Calibration RPM4 provides pressure rate measurement.
This allows the operator to observe how quickly pressure is changing.
Pressure rate information is particularly useful when determining whether a calibration point has stabilized sufficiently before a measurement value is recorded.
Automated Leak Testing
Leakage can have a significant effect on precision pressure calibration.
The RPM4 therefore includes automated leak testing functionality.
The instrument can evaluate the rate of pressure change over a defined period.
This helps the operator determine whether the pressure system is sufficiently leak-tight for the required calibration.
Pressure Averaging
The RPM4 can average pressure measurements over a defined period.
This function can be useful when small pressure fluctuations are present.
Averaging can provide a more representative value for selected measurement applications.
High and Low Pressure Monitoring
Integrated high and low pressure functions allow the Fluke Calibration RPM4 to monitor pressure variations during a test.
This can be useful for:
- Pressure stability testing
- System evaluation
- Long-term pressure monitoring
- Calibration setup analysis
Resolution Down to 1 ppm
The RPM4 platform provides user-adjustable resolution down to:
1 ppm.
This allows the display resolution to be adapted to the specific calibration task.
The operator can therefore select a useful indication resolution without displaying unnecessary digits.
RS232 Communication
The Fluke Calibration RPM4 includes RS232 communication.
The platform provides serial interfaces for remote communication with computers and calibration systems.
This supports:
- Remote operation
- Automated data acquisition
- Calibration software integration
- Automated test sequences
IEEE-488.2 Communication
The RPM4 also includes:
IEEE-488.2 / GPIB communication.
GPIB remains widely used in professional calibration laboratories and automated measurement systems.
The combination of RS232 and IEEE-488.2 makes the RPM4 easy to integrate into existing pressure calibration environments.
Software Integration
The Fluke Calibration RPM4 can be integrated into computer-controlled calibration systems.
Fluke Calibration provides software resources and instrument support for automated pressure calibration applications.
The RPM4 platform is also supported by Fluke Calibration’s pressure calibration ecosystem, including tools for communication, calibration and Q-RPT management.
External Q-RPTs
Another important feature of the RPM4 platform is its ability to work with:
external Q-RPTs.
This can expand the available pressure ranges and increase the flexibility of a calibration system.
A laboratory can therefore configure an RPM4 installation around its actual calibration requirements instead of being limited to a single internal pressure range.
Optional Battery Pack
An optional battery pack is available for the Fluke Calibration RPM4.
Battery operation is particularly useful when the RPM4 is used as a:
- Transfer standard
- Mobile laboratory reference
- Portable calibration reference
This allows high-performance pressure measurement at locations where mains power is not conveniently available.
19-Inch Rack Installation
For permanent laboratory systems, a rack mount kit is available.
The RPM4 can therefore be integrated into a standard:
19-inch equipment rack.
This is useful for automated calibration benches and complete pressure calibration systems.
Compact and Rugged Design
Despite its high metrological performance, the Fluke Calibration RPM4 has a compact and rugged design.
The instrument was developed for demanding laboratory and transfer-standard applications.
This combination of measurement performance and portability makes the RPM4 useful both as a stationary laboratory reference and as part of a transportable calibration system.
Technical Highlights
| Feature | Fluke Calibration RPM4 |
|---|---|
| Product type | Reference Pressure Monitor |
| Measurement technology | Q-RPT Quartz Reference Pressure Transducers |
| Minimum available range | 15 kPa / 2.2 psi compound gauge |
| Maximum available pressure | 280 MPa / 40,000 psi |
| Best specified uncertainty | ±0.008% of reading |
| Resolution | Down to 1 ppm, adjustable |
| Q-RPT configuration | Single or dual channel |
| Range optimization | Infinite Ranging™ |
| Automatic setup | AutoRange™ |
| Zero functionality | AutoZero |
| Q-RPT protection | SDS™ Self Defense System |
| Leak testing | Integrated |
| Pressure rate measurement | Integrated |
| External Q-RPT support | Yes |
| RS232 | Yes |
| IEEE-488.2 / GPIB | Yes |
| Battery pack | Optional |
| Rack mounting | Optional |
| Remote operation | Yes |
| Automated calibration | Supported |
Flexible Q-RPT Configurations
The Fluke Calibration RPM4 is not limited to one fixed pressure range.
The exact model configuration is defined by the installed Q-RPT modules.
The RPM4 model structure identifies the high-range Q-RPT and, when installed, the low-range Q-RPT as well as the respective Q-RPT class.
This modular concept allows the pressure monitor to be configured according to the intended calibration workload.
For laboratories with several pressure ranges, a dual-Q-RPT configuration can provide significantly greater flexibility than a single fixed-range pressure reference.
RPM4 BA100K Reference Barometer
The RPM4 family also includes the specialized:
RPM4 BA100K Reference Pressure Barometer.
This configuration is designed specifically for high-performance atmospheric pressure measurement.
Its range extends from:
70 kPa to 110 kPa absolute.
It should therefore be distinguished from the general-purpose RPM4 configurations.
RPM4-AD Air Data Version
Another specialized member of the RPM4 family is the:
RPM4-AD.
The RPM4-AD was designed specifically for air data calibration and provides dedicated measurement of:
- Pt
- Ps
- Qc
- Altitude
- Airspeed
The standard Fluke Calibration RPM4, by contrast, is intended as a versatile reference pressure monitor for general precision pressure calibration, testing and measurement.
Typical Applications
The Fluke Calibration RPM4 is suitable for:
- Reference pressure measurement
- Pressure gauge calibration
- Digital pressure gauge calibration
- Pressure transmitter calibration
- Pressure sensor calibration
- Pressure transducer calibration
- Pressure switch testing
- Absolute pressure calibration
- Gauge pressure calibration
- Compound pressure measurement
- Low-pressure calibration
- High-pressure calibration
- Comparison calibration
- Transfer standard applications
- Automated pressure calibration
- Calibration laboratories
- Research laboratories
- Production testing
- Quality assurance
- Pressure metrology
Why Choose the Fluke Calibration RPM4?
The Fluke Calibration RPM4 provides a highly flexible solution for laboratories that require precision pressure measurement across a wide variety of ranges.
Its Q-RPT quartz reference pressure transducers provide the stability and measurement performance required for professional pressure metrology. Depending on configuration, the RPM4 platform covers pressure ranges from 15 kPa compound gauge all the way to 280 MPa / 40,000 psi.
Measurement uncertainty as low as ±0.008% of reading enables the RPM4 to serve as a high-performance reference pressure monitor and transfer standard.
Infinite Ranging™ and AutoRange™ allow the system to adapt to different working ranges, while AutoZero supports long-term measurement performance.
The SDS™ Self Defense System protects compatible Q-RPT modules against accidental overpressure, an important advantage when working with precision reference transducers.
RS232 and IEEE-488.2 communication enable straightforward integration into automated calibration systems, while optional battery operation increases flexibility for transfer-standard applications.
At europascal, the Fluke Calibration RPM4 can be combined with suitable pressure generators, controllers and calibration equipment to create a complete professional pressure calibration system.
For professional calibration and metrological traceability, visit the europascal Calibration Service.
