Fluke Calibration Ruska 7250xi is a precise digital pressure controller and calibrator designed for demanding automated pressure calibration in calibration laboratories, manufacturing environments and pressure metrology applications. The instrument combines high-precision quartz pressure measurement with fast automatic pressure control and a wide usable measurement range.
The key advantage of the Fluke Calibration Ruska 7250xi is its percent-of-reading performance over a particularly wide portion of the selected pressure range. The 7250xi provides a measurement precision of 0.005% of reading from 20% to 100% of full scale. Below 20% of full scale, the precision is specified as 0.005% of 20% FS.
This performance is achieved using multiple quartz pressure sensors within a single instrument. The technology allows one 7250xi to cover a broader pressure workload while maintaining excellent measurement performance.
Available full-scale pressure ranges extend from 20 psig to 2,500 psig, corresponding to approximately 138 kPa to 17.2 MPa. Optional operating modes expand the capabilities of the controller for absolute and negative gauge pressure applications.
The pressure controller provides active control stability of 0.001% FS, while typical pressure control response is 20 seconds or less for specified conditions and pressure ranges up to 2,500 psi.
RS232 and IEEE-488 interfaces, SCPI command syntax and several instrument emulation modes allow the Fluke Calibration Ruska 7250xi to be integrated into automated calibration systems.
At europascal, the Fluke Calibration Ruska 7250xi can be integrated into professional pressure calibration systems with suitable pressure supplies, accessories and calibration software. For professional calibration and metrological traceability, visit the europascal Calibration Service.
Your Benefits at a Glance
The Fluke Calibration Ruska 7250xi combines wide-range pressure measurement with precise automated pressure control.
Key benefits include:
- Digital high-speed pressure controller and calibrator
- Quartz pressure sensor technology
- Multiple quartz sensors in one instrument
- 0.005% of reading precision
- Percent-of-reading specification from 20% to 100% FS
- Pressure ranges from 20 to 2,500 psig
- Maximum pressure range up to 17.2 MPa
- Active pressure control stability of 0.001% FS
- Fast automatic pressure control
- Typical control response of 20 seconds or less
- User-selectable display resolution up to 1:1,000,000
- Optional absolute pressure operation
- Optional negative gauge pressure operation
- Optional barometric reference
- Nitrogen or clean, dry air pressure medium
- Accredited calibration report supplied as standard
- RS232 interface
- IEEE-488 interface
- SCPI command syntax
- Instrument emulation modes
- Suitable for automated calibration systems
- Compatible with pressure calibration software
- Rack-mount capability
- Professional laboratory design
Pressure Ranges up to 2,500 psi
The Fluke Calibration Ruska 7250xi can be configured with full-scale pressure ranges from:
20 psig to 2,500 psig
or approximately:
138 kPa to 17.2 MPa.
This broad selection of pressure ranges allows the instrument to be configured for the actual calibration workload.
Instead of selecting a single fixed standard range, users can choose an appropriate full-scale pressure range for their pressure instruments and calibration applications.
0.005% of Reading Precision
One of the most important features of the Fluke Calibration Ruska 7250xi is its:
0.005% of reading precision.
This specification applies from:
20% to 100% of full scale.
Below 20% FS, precision is specified as:
0.005% of 20% FS.
This percent-of-reading performance provides a significant advantage when calibrating devices with different pressure ranges using a single controller.
Multiple Quartz Pressure Sensors
The high performance of the Fluke Calibration Ruska 7250xi is achieved through the use of:
multiple quartz pressure sensors.
Quartz pressure sensing technology provides excellent precision, repeatability and long-term stability.
Unlike a conventional pressure controller based on a single full-scale sensor, the 7250xi uses multiple quartz sensor ranges to maintain its percent-of-reading performance over a much wider part of the instrument range.
This makes the 7250xi particularly attractive for calibration laboratories with a broad pressure workload.
Quartz Bourdon Tube Technology
The Ruska 7250 Series uses Fluke Calibration’s quartz pressure sensing technology.
A quartz Bourdon tube pressure sensor provides a highly stable basis for precision pressure measurement.
The sensing technology is one of the central reasons why Ruska pressure standards have traditionally been used in demanding pressure metrology applications.
For the 7250xi, several quartz sensor ranges are combined to provide the specified wide-range performance.
Wide Calibration Workload
A conventional full-scale specification can limit the useful range of a pressure controller when calibrating lower-range devices.
The Fluke Calibration Ruska 7250xi addresses this problem with its percent-of-reading specification extending down to 20% of full scale.
This allows one instrument to cover a wider range of devices under test while maintaining excellent measurement performance.
The result can be fewer pressure standards, reduced equipment investment and a simpler calibration workstation.
Pressure Control Stability
Precise pressure measurement alone is not sufficient for automated calibration.
The test pressure must also remain stable.
The Fluke Calibration Ruska 7250xi provides active pressure control stability of:
0.001% FS
or:
10 ppm FS.
In passive mode, Fluke specifies no additional uncertainty due to pressure control.
This stable pressure generation provides excellent conditions for comparing pressure gauges, transmitters, sensors and other devices under test.
Fast Pressure Control
The Fluke Calibration Ruska 7250xi is designed for fast automated calibration.
For ranges up to 2,500 psi, Fluke specifies a typical control response of:
20 seconds or less
under defined conditions with 10% full-scale pressure increments and an appropriate test volume.
The controller is designed to approach the requested pressure without overshoot under the specified conditions.
Fast pressure control can significantly reduce the overall duration of automated multipoint calibrations.
High Display Resolution
The pressure display resolution is user selectable up to:
1:1,000,000.
This high resolution allows small pressure changes to be observed clearly.
The display resolution can be selected according to the measurement range and calibration application.
Absolute Pressure Option
The Fluke Calibration Ruska 7250xi can be equipped for absolute pressure operation using an optional barometric reference sensor.
This option allows gauge pressure ranges to be used for absolute pressure measurement and control.
Absolute operation is available for suitable ranges from approximately:
100 kPa to 17.2 MPa.
This expands the range of pressure instruments that can be calibrated with one controller.
Negative Gauge Pressure
Optional negative gauge operation extends the Fluke Calibration Ruska 7250xi into vacuum-related applications.
This allows the controller to generate and regulate pressures below local atmospheric pressure when the system is appropriately configured.
An external vacuum source is required for vacuum operation.
This option makes the controller suitable for laboratories that need to calibrate both positive and negative gauge pressure instruments.
Pressure Medium
The specified pressure medium for the Fluke Calibration Ruska 7250xi is:
nitrogen
or:
clean, dry air.
Using clean gas helps protect the internal pressure sensors, valves and pneumatic system from contamination.
The pressure supply must be suitable for the configured instrument range and calibration application.
Automatic Pressure Calibration
The Fluke Calibration Ruska 7250xi is both a precision pressure measuring instrument and an automatic pressure controller.
A typical calibration system consists of:
Pressure Supply + Fluke Calibration Ruska 7250xi + Device Under Test
The operator or calibration software enters the required pressure setpoint.
The controller automatically regulates the system to the requested pressure.
Once the pressure has stabilized, the DUT indication can be compared with the reference pressure measured by the 7250xi.
The process can then be repeated automatically for additional calibration points.
Pressure Gauge Calibration
The Fluke Calibration Ruska 7250xi is suitable for calibration of precision pressure gauges and digital pressure gauges.
The device under test is connected directly to the controller’s test pressure system.
The 7250xi automatically generates and measures each calibration point.
The difference between the pressure measured by the 7250xi and the DUT indication can then be determined.
This provides an efficient solution for repeated multipoint pressure gauge calibrations.
Pressure Transmitter Calibration
Pressure transmitters can also be calibrated using the Fluke Calibration Ruska 7250xi.
The controller provides the precise pneumatic pressure input while an electrical measurement system measures the transmitter output.
For a conventional industrial pressure transmitter, this output is often:
4 to 20 mA.
Automated calibration software can combine pressure values and electrical readings to determine transmitter errors across the complete measurement range.
Pressure Sensor Calibration
The Fluke Calibration Ruska 7250xi can be used for pressure sensor and pressure transducer calibration.
The sensor under test is exposed to precisely controlled pressure.
Its electrical output is measured at defined calibration points and compared with the pressure reference provided by the 7250xi.
The high precision and stable automatic control make the system suitable for demanding sensor characterization and calibration applications.
Automated Calibration
The 7250xi is particularly well suited to automated calibration systems.
Remote communication interfaces allow calibration software to:
- Set pressure values
- Read pressure measurements
- Change operating modes
- Execute calibration sequences
- Monitor controller status
- Integrate pressure measurements into automated procedures
Automation reduces operator workload and helps improve consistency between repeated calibrations.
RS232 Interface
The Fluke Calibration Ruska 7250xi provides an:
RS232 interface.
This interface can be used for remote control, automated calibration and firmware-related communication.
It also makes integration into existing laboratory systems possible.
IEEE-488 Interface
For professional automated test systems, the 7250xi also provides:
IEEE-488 / GPIB.
GPIB remains widely used in calibration laboratories and automated measurement systems.
The interface allows the controller to be integrated alongside other precision laboratory instruments.
SCPI Commands
The Fluke Calibration Ruska 7250xi supports:
SCPI command syntax.
SCPI provides a standardized command structure for programmable test and measurement instruments.
This simplifies integration into new automated calibration systems.
Instrument Emulation
The 7250 Series also provides emulation capabilities for selected earlier pressure instruments.
Supported emulation modes include:
- Series 7215
- Model 7010
- Series 6000
- DPI 510
This can simplify replacement of older pressure controllers in automated systems because existing control software may require fewer modifications.
Calibration Software Integration
The Fluke Calibration Ruska 7250xi can be integrated into computer-controlled pressure calibration systems.
Fluke provides support for tools and drivers used in automated calibration environments.
This makes the instrument suitable for both standalone operation and complex automated laboratory systems.
Accredited Calibration
An important advantage for professional calibration laboratories is that Fluke specifies an:
accredited calibration report as standard.
This provides documented metrological traceability for the pressure controller.
The exact scope, calibration points and reported uncertainty should be checked against the supplied calibration documentation and the requirements of the user’s quality system.
Total Uncertainty
For the Fluke Calibration Ruska 7250xi, Fluke specifies total uncertainty over the main percent-of-reading range.
From 20% to 100% FS, the specified values include approximately:
90 days: 0.006% of reading
and:
1 year: 0.009% of reading.
These values incorporate relevant contributions beyond the basic precision specification and are particularly useful when evaluating the controller for a calibration uncertainty budget.
Pressure Connections
The test and supply pressure connections are:
1/4 inch NPT female.
Suitable pressure tubing, fittings and adapters must be selected according to the maximum operating pressure of the configured instrument.
All connected components must be rated for the pressure applied.
Test Volume
The controller is designed to work with connected test volumes over a specified range.
Typical supported volumes extend approximately from:
82 cm³ to 980 cm³
or:
5 in³ to 60 in³.
Correct test volume and pneumatic installation contribute to optimum control performance.
Color Display
The 7250 Series uses a TFT active-matrix display with:
640 × 480 pixel resolution.
The approximately:
6.4-inch display
provides clear presentation of pressure readings, setpoints and operating information.
Dimensions
The dimensions of the Fluke Calibration Ruska 7250xi are approximately:
178 × 419 × 483 mm
or:
7 × 16.5 × 19 inches.
The instrument format is suitable for both benchtop operation and integration into laboratory racks.
Weight
The Fluke Calibration Ruska 7250xi weighs approximately:
9 kg / 20 lb.
This makes the instrument compact enough for flexible laboratory installation while providing the pneumatic and measurement systems required for automated pressure calibration.
Rack Mounting
Optional rack-mount kits are available for integration into:
19-inch EIA cabinets.
This is particularly useful for permanent calibration workstations and automated test systems.
Technical Highlights
| Feature | Fluke Calibration Ruska 7250xi |
|---|---|
| Product type | Digital Pressure Controller / Calibrator |
| Sensor technology | Multiple quartz pressure sensors |
| Pressure ranges | 20 to 2,500 psig |
| Maximum pressure | 2,500 psi / 17.2 MPa |
| Precision, 20 to 100% FS | 0.005% of reading |
| Precision below 20% FS | 0.005% of 20% FS |
| Control stability | 0.001% FS |
| Display resolution | Up to 1:1,000,000 |
| Typical control response | ≤20 seconds |
| Pressure medium | Nitrogen or clean, dry air |
| Absolute pressure | Optional |
| Negative gauge pressure | Optional |
| RS232 | Yes |
| IEEE-488 / GPIB | Yes |
| SCPI | Yes |
| Test and supply ports | 1/4 in NPT female |
| Display | 6.4 in TFT, 640 × 480 |
| Dimensions | 178 × 419 × 483 mm |
| Weight | Approx. 9 kg |
| Accredited calibration report | Standard |
7250xi vs. 7250i
The Fluke Calibration Ruska 7250xi offers an important performance advantage over the 7250i.
Both instruments provide:
0.005% of reading precision.
However, the specified percent-of-reading range differs.
The 7250i provides this performance from:
40% to 100% FS.
The 7250xi extends it from:
20% to 100% FS.
The 7250xi therefore provides a substantially wider useful pressure range while maintaining the same percent-of-reading precision specification.
This can reduce the number of separate pressure ranges required in a calibration laboratory.
7250xi vs. 7250
The standard Ruska 7250 uses a different measurement concept and specification.
For ranges up to 2,500 psi, the standard 7250 provides a precision specification based primarily on:
percentage of full scale.
The 7250xi uses multiple quartz sensors to provide its:
0.005% of reading
specification over a broad portion of the measurement range.
The 7250xi is therefore particularly advantageous when one controller must calibrate devices covering several different pressure ranges.
Typical Applications
The Fluke Calibration Ruska 7250xi is suitable for:
- Precision pressure calibration
- Automated pressure calibration
- Pressure gauge calibration
- Digital pressure gauge calibration
- Pressure transmitter calibration
- Pressure transducer calibration
- Pressure sensor calibration
- Reference pressure measurement
- Gauge pressure calibration
- Optional absolute pressure calibration
- Optional negative gauge calibration
- Calibration laboratory automation
- Production calibration
- Quality assurance
- Research and development
- Aerospace pressure calibration
- Industrial pressure metrology
- Automated test systems
- High-accuracy pressure measurement
Why Choose the Fluke Calibration Ruska 7250xi?
The Fluke Calibration Ruska 7250xi combines the proven precision of Ruska quartz pressure sensing technology with fast automatic pressure control and wide-range percent-of-reading performance.
Its most important advantage is the 0.005% of reading precision from 20% to 100% of full scale. Multiple quartz pressure sensors allow this performance to be maintained over a much wider pressure range than is possible with a conventional single full-scale sensor.
Available ranges from 20 to 2,500 psig / 138 kPa to 17.2 MPa allow the controller to be configured for a wide variety of laboratory pressure applications.
Active control stability of 0.001% FS and typical pressure control response of 20 seconds or less provide fast and stable calibration points for pressure gauges, transmitters, sensors and transducers.
Optional absolute and negative gauge capabilities further expand the possible calibration workload.
RS232, IEEE-488 and SCPI communication make the 7250xi particularly suitable for automated calibration. Instrument emulation modes also simplify replacement of selected legacy pressure controllers in existing calibration systems.
With its accredited calibration report, high-resolution display and professional laboratory construction, the Fluke Calibration Ruska 7250xi is an excellent solution for demanding pressure metrology and automated calibration applications.
At europascal, the Fluke Calibration Ruska 7250xi can be integrated with suitable pressure supplies, pneumatic accessories, calibration software and additional measurement equipment to create a complete automated pressure calibration system.
For professional calibration and metrological traceability, visit the europascal Calibration Service.
