Fluke Calibration RUSKA 7252 is a precise dual output digital pressure controller designed for demanding pneumatic pressure calibration in calibration laboratories, manufacturing, quality assurance and automated test systems. Its key advantage is the integration of two independent pressure control channels in a single instrument, allowing two different pressure ranges to be controlled simultaneously or combined to provide exceptionally broad pressure range coverage.
The Fluke Calibration RUSKA 7252 uses proven Quartz Bourdon Tube pressure sensor technology for precise and stable pressure measurement. The 7252 can be configured with two full-scale pressure ranges between 5 psi and 2,500 psi, corresponding to approximately 400 mbar to 172 bar. Each installed range provides a precision of 0.003% of full scale.
With active pressure control stability of 0.001% of each range, fast automatic pressure control and selectable display resolution up to 1:1,000,000, the Fluke Calibration RUSKA 7252 provides the performance required for precision pressure calibration.
The two independent control channels can also increase laboratory throughput because two calibrations can be performed simultaneously. Alternatively, suitable configurations can interconnect the channels to automatically select the appropriate pressure range during a single calibration.
At europascal, the Fluke Calibration RUSKA 7252 can be integrated into professional automated 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 7252 combines two independent pressure controllers in a single laboratory instrument.
Key benefits include:
- Dual output digital pressure controller
- Two independent pressure control channels
- Simultaneous control of two different pressures
- Two calibrations can be performed simultaneously
- Two selectable pressure ranges in one instrument
- Pressure ranges from 5 to 2,500 psi
- Maximum pressure up to 172 bar
- Precision of 0.003% FS for each installed range
- Control stability of 0.001% of each range
- Quartz Bourdon Tube pressure sensor technology
- Fast automatic pressure control
- Zero overshoot under specified conditions
- Selectable resolution up to 1:1,000,000
- Automatic range operation with suitable configurations
- Optional absolute pressure operation
- Optional negative gauge operation
- Optional barometric reference
- Optional vacuum reference
- More than 15 selectable pressure units
- Automatic head pressure correction
- Autozero function
- Autovent function
- Programmable upper and lower pressure limits
- RS232 communication
- IEEE-488 / GPIB interface
- SCPI command syntax
- LabVIEW driver support
- Optional MET/CAL driver
- Suitable for automated calibration
- Nitrogen or clean, dry air as pressure medium
- Large 6.4-inch color display
Two Independent Pressure Control Channels
The defining feature of the Fluke Calibration RUSKA 7252 is its dual-channel architecture.
Instead of installing two separate pressure controllers, the 7252 incorporates:
two independent pressure measurement and control channels in one instrument.
Each channel can control its own pressure range.
This provides two major advantages.
The channels can be operated independently to perform two calibrations simultaneously, increasing laboratory throughput.
Alternatively, suitable pressure ranges can be interconnected to provide wide-range operation for a single calibration workload.
Pressure Ranges up to 2,500 psi
The Fluke Calibration RUSKA 7252 can be configured with two full-scale pressure ranges selected from:
5 psi to 2,500 psi
or approximately:
400 mbar to 172 bar.
This flexibility makes it possible to configure the instrument according to the pressure workload of the calibration laboratory.
For example, a lower range can be selected for precise calibration of lower-pressure instruments while the second channel covers substantially higher pressures.
This provides much greater flexibility than a conventional single-range pressure controller.
0.003% FS Precision
The Fluke Calibration RUSKA 7252 provides a pressure measurement precision of:
0.003% of full scale
for each installed range from 5 psi to 2,500 psi.
Fluke defines this precision as including the combined effects of:
- Linearity
- Repeatability
- Hysteresis
throughout the specified operating temperature range.
Quartz Bourdon Tube Pressure Sensor
At the heart of the Fluke Calibration RUSKA 7252 is Fluke Calibration’s proven:
Quartz Bourdon Tube pressure sensor technology.
This technology is designed for high-precision pressure measurement and has been a key feature of RUSKA pressure standards.
The quartz sensing principle provides excellent repeatability and stability, making the 7252 suitable for demanding pressure metrology applications. Fluke specifically identifies the quartz Bourdon tube reference sensor as a distinguishing technology of RUSKA pressure controllers.
Excellent Pressure Control Stability
A precision pressure controller must not only measure pressure accurately but also maintain a stable pressure setpoint.
In active control mode, the Fluke Calibration RUSKA 7252 provides control stability of:
0.001% of each range.
In passive mode, Fluke specifies no additional uncertainty due to pressure control.
This stable control provides excellent conditions for calibrating high-quality pressure gauges, transmitters, sensors and transducers.
Fast Automatic Pressure Control
The Fluke Calibration RUSKA 7252 is designed for efficient automated calibration.
Under specified conditions, the controller typically reaches a new pressure setpoint in:
20 seconds or less
for 10% full-scale pressure increments into a 245 cm³ test volume, with zero overshoot.
Fast and stable control can significantly reduce the total duration of multipoint calibration procedures.
Simultaneous Calibration
One of the greatest advantages of the Fluke Calibration RUSKA 7252 is the ability to perform two calibration tasks simultaneously.
Because the instrument contains two independently controlled pressure channels, each channel can operate at a different pressure.
This makes it possible to connect separate devices under test and run two pressure calibration procedures at the same time.
For laboratories with a high calibration workload, this can substantially increase throughput without requiring two complete pressure controllers.
Wide-Range Operation
For selected configurations, the two channels of the Fluke Calibration RUSKA 7252 can be interconnected.
When configured appropriately, the controller automatically selects the pressure range required for the target pressure.
This provides a wide operating range while retaining the measurement performance of the individual installed ranges.
Fluke specifies this combined operation for appropriate dual ranges between approximately 1 and 70 bar.
Automatic Pressure Calibration
The Fluke Calibration RUSKA 7252 is designed for automated pressure calibration.
A typical calibration arrangement consists of:
Pressure Supply + Fluke Calibration RUSKA 7252 + Device Under Test
The required pressure is entered manually or sent to the controller from calibration software.
The 7252 automatically regulates the pressure to the requested setpoint.
Once stable, the reference pressure can be compared with the indication or output of the device under test.
The procedure can then continue automatically through additional calibration points.
Pressure Gauge Calibration
The Fluke Calibration RUSKA 7252 is suitable for precise calibration of:
- Analog pressure gauges
- Digital pressure gauges
- Reference pressure gauges
- Industrial pressure indicators
The automatic controller generates and maintains each required calibration pressure.
The DUT indication can then be compared with the reference pressure measured by the 7252.
Pressure Transmitter Calibration
The Fluke Calibration RUSKA 7252 can be used as the pneumatic pressure source and pressure reference for calibration of pressure transmitters.
The controller applies precisely regulated pressure to the transmitter.
An appropriate electrical measurement instrument simultaneously measures the transmitter output, such as a standard:
4 to 20 mA signal.
This arrangement is particularly suitable for automated transmitter calibration systems.
Pressure Sensor Calibration
Pressure sensors and transducers can also be calibrated with the Fluke Calibration RUSKA 7252.
The device under test receives the same controlled pressure measured by the reference controller.
Its electrical output can then be recorded at multiple pressure points.
This enables characterization and calibration of pressure sensors across their complete measurement range.
Absolute Pressure Calibration
The Fluke Calibration RUSKA 7252 offers several options for absolute pressure calibration.
A:
barometric reference option
allows gauge ranges from approximately 1 to 172 bar to be operated in absolute mode.
For applications requiring higher absolute pressure performance, a:
Vacuum Reference option
is available.
With this configuration, an external vacuum pump is connected to the reference system.
Vacuum Reference
The optional Vacuum Reference provides an alternative to calculating absolute pressure using a secondary barometric sensor.
According to Fluke, this approach avoids the additional uncertainty associated with the barometric reference sensor.
The Vacuum Reference option also includes an internal vacuum sensor to support automatic zeroing during absolute pressure operation.
An external vacuum pump is required.
Negative Gauge Pressure
The Fluke Calibration RUSKA 7252 can also be configured for:
negative gauge pressure operation.
This expands the range of devices that can be calibrated and enables measurements below atmospheric pressure.
The appropriate configuration and vacuum equipment must be selected for the intended pressure range.
Autozero
The Fluke Calibration RUSKA 7252 provides an:
Autozero function.
This allows the instrument to automatically establish the pressure zero under suitable operating conditions.
Regular zeroing helps maintain optimum measurement performance during precision calibration.
Autovent
The:
Autovent function
automatically vents the test port to atmosphere.
This provides convenient pressure release after a calibration sequence and simplifies routine operation.
Autovent is not applicable to permanent absolute configurations.
Device Under Test Protection
Protecting the device under test is especially important during automatic pressure generation.
The Fluke Calibration RUSKA 7252 allows the operator to define:
upper and lower pressure limits.
These limits help prevent the controller from applying pressure outside the permitted range of the connected device.
Automatic Head Pressure Correction
Differences in height between the pressure reference and device under test can introduce a pressure difference.
The Fluke Calibration RUSKA 7252 provides:
automatic head pressure correction.
This allows the vertical difference between the instrument reference level and the DUT reference level to be considered during pressure measurement.
This function is particularly useful in precision calibration systems where even small pressure differences can become significant.
Multiple Pressure Units
The Fluke Calibration RUSKA 7252 supports more than 15 standard pressure units.
These include units such as:
- psi
- bar
- kPa
- inHg
- inH₂O
- kg/cm²
- mmHg
- cmHg
- cmH₂O
Two user-defined units are also supported.
Step Up and Step Down Function
For calibration sequences with fixed pressure intervals, the 7252 provides a convenient:
Step Up / Step Down function.
The operator defines the desired pressure increment.
Using the jog dial, the controller can then increase or decrease the pressure by the selected amount.
This simplifies repetitive multipoint calibration procedures.
Sweep Test
The Fluke Calibration RUSKA 7252 also provides an automatic:
Sweep Test.
The operator defines:
- Starting pressure
- Final pressure
- Number of cycles
The controller then automatically cycles the pressure between these points.
This is useful for exercising pressure gauges and other devices before the actual calibration procedure.
RS232 Interface
The Fluke Calibration RUSKA 7252 provides an:
RS232 interface
for remote communication.
It can be used for automated calibration, remote instrument control and firmware updates.
IEEE-488 Interface
The instrument also includes:
IEEE-488 / GPIB.
This interface is widely used in professional calibration laboratories and automated test systems.
It allows the RUSKA 7252 to be integrated with other precision measurement equipment.
SCPI Commands
The Fluke Calibration RUSKA 7252 supports:
SCPI command syntax.
This standardized programming language simplifies integration into automated measurement and calibration applications.
Calibration Software Integration
The RUSKA 7252 can be integrated into computerized calibration systems.
Fluke provides a LabVIEW driver, while a MET/CAL driver is available as an option.
This makes the controller suitable for both custom automation applications and standardized calibration workflows.
Pressure Medium
The specified pressure medium for the Fluke Calibration RUSKA 7252 is:
nitrogen
or:
clean, dry air.
Clean pneumatic media help protect the sensitive internal pressure sensors and control valves.
The pressure supply must be appropriately rated for the selected controller range.
Large Color Display
The Fluke Calibration RUSKA 7252 incorporates a:
6.4-inch TFT active-matrix color display.
Display resolution is:
640 × 480 pixels.
The graphical user interface supports multiple languages, including English and German.
Technical Highlights
| Feature | Fluke Calibration RUSKA 7252 |
|---|---|
| Product type | Dual Output Digital Pressure Controller |
| Control channels | 2 independent channels |
| Pressure ranges | Two selectable ranges |
| Range selection | 5 to 2,500 psi |
| Maximum pressure | 2,500 psi / 172 bar |
| Precision | 0.003% FS per range |
| Annual stability | 0.0075% of reading |
| Active control stability | 0.001% of each range |
| Display resolution | Up to 1:1,000,000 |
| Typical control response | ≤20 seconds |
| Sensor technology | Quartz Bourdon Tube |
| Absolute pressure | Optional |
| Negative gauge | Optional |
| Pressure medium | Nitrogen or clean, dry air |
| RS232 | Yes |
| IEEE-488 / GPIB | Yes |
| SCPI | Yes |
| LabVIEW support | Yes |
| MET/CAL driver | Optional |
| Display | 6.4-inch TFT VGA |
| Pressure connections | 1/4 inch NPT female |
| Dimensions | 178 × 419 × 483 mm |
| Weight | Approx. 9 kg |
| Electrical supply | 90 to 260 VAC, 50/60 Hz |
The technical values above correspond to the current Fluke specifications for the Series 7252.
Fluke Calibration RUSKA 7252 vs. 7252i
An important distinction must be made between the Fluke Calibration RUSKA 7252 and the RUSKA 7252i.
Both instruments provide:
- Two independent pressure control channels
- Quartz pressure sensor technology
- Automatic pressure control
- Wide pressure range configurations
- 0.001% FS active control stability
The main difference is the pressure measurement specification.
The RUSKA 7252 provides:
0.003% FS precision for each installed range.
The RUSKA 7252i provides:
0.005% of reading precision from 40% to 100% of each installed standard range.
The 7252i is therefore particularly advantageous when percent-of-reading performance across a wider portion of an installed range is required, while the 7252 provides excellent full-scale-based performance.
Two Controllers in One Instrument
The dual-channel architecture is one of the strongest reasons to select the Fluke Calibration RUSKA 7252.
Fluke describes the RUSKA 7252 concept effectively as two pressure controllers in one enclosure.
This can reduce the amount of laboratory rack space required compared with installing two separate pressure controllers while also providing the flexibility to perform two calibrations simultaneously.
Typical Applications
The Fluke Calibration RUSKA 7252 is suitable for:
- Automated pressure calibration
- Precision pressure calibration
- Pressure gauge calibration
- Digital pressure gauge calibration
- Pressure transmitter calibration
- Pressure transducer calibration
- Pressure sensor calibration
- Gauge pressure calibration
- Optional absolute pressure calibration
- Negative gauge pressure calibration
- Production calibration
- Quality assurance
- Research and development
- Calibration laboratory automation
- Automated test equipment
- Industrial pressure metrology
- Aerospace pressure calibration
- High-throughput calibration laboratories
Why Choose the Fluke Calibration RUSKA 7252?
The Fluke Calibration RUSKA 7252 provides a particularly flexible solution for laboratories that require precise automatic pressure generation across more than one pressure range.
Its greatest advantage is the integration of two independent pressure control channels in one instrument.
The two channels can perform separate calibration tasks simultaneously, increasing laboratory throughput. With suitable range combinations, they can also be interconnected for wide-range automatic pressure calibration.
Pressure ranges can be selected from 5 to 2,500 psi / approximately 400 mbar to 172 bar, enabling the controller to be configured specifically for the required calibration workload.
The 7252 provides 0.003% FS precision for each installed range, while active pressure control stability of 0.001% of each range ensures stable calibration points.
Quartz Bourdon Tube pressure sensors provide the measurement foundation required for demanding pressure metrology. Automatic control, Step Up/Down, Sweep Test, Autozero, Autovent and programmable pressure limits simplify routine calibration procedures.
RS232, IEEE-488 and SCPI communication enable straightforward integration into automated laboratory systems. LabVIEW support and an optional MET/CAL driver further expand automation possibilities.
Optional barometric and vacuum references allow absolute pressure applications, while optional negative gauge operation increases the range of devices that can be calibrated.
At europascal, the Fluke Calibration RUSKA 7252 can be combined with suitable pressure supplies, pneumatic accessories and calibration software to create a complete automated pressure calibration workstation.
For professional calibration and metrological traceability, visit the europascal Calibration Service.
