Series 7252
Ruska Dual Output
Digital PressureControllers

Technical DataFeatures• Dual range controller with independent test
ports for each range• Simultaneous pressure control for eachrange• Select anyrange combination from 0 to
2
10 inH O (25 mbar) to 0 to 2500 psi(172 bar).
• Two models to choose from, 7252i or 7252
• Time to setpoint < 15 seconds with noovershoot• Languages: English, French, Chinese,German, Japanese, Spanish and Italian

The Series 7252 dual output digital pressure controllers provide a unique and flexible
approach to performing automated calibrations
over a wide pressure range with a single instrument. This is accomplished through the use of
two separate pressure sensors with independentpressure controllers for each range. Additionally,each range can be operated simultaneously toprovide maximum efficiency and throughput.
For applications that do not require a dual
output controller, Fluke Calibration offers theSeries 7250 multi-range single output pressurecontrollers. Please refer to the Series 7250 data
sheet for complete information.
Adding to the flexibility of the Series 7252,
two performance models are available: theModel 7252i that offers percent of reading
performance further extending the capabilities
of a single calibrator, or the Model 7252, thatprovides percent of full scale (FS) performancefor each range.

The Model 7252i provides a precision of
0.005 % of Reading from 25 % to 100 % ofeach installed range. For pressures below thelower threshold of 25 %, the precision becomes
0.005 % of the 25 % value. Alternatively, theModel 7252 provides a precision of 0.003 % of
FS for each installed range. Both models provide
a one year stability of 0.0075 % of Reading
allowing a one year calibration interval.
Both the 7252i and 7252 are available in avariety of pressure ranges. Choose from anypressure range combination from as low as
10 inH2O (25 mbar) up to 2500 psi (172 bar).
For example, either the Model 7252 or 7252i
can be configured with a lower pressure
range of 10 psi (1 bar) and an upper range of
1 000 psi (70 bar). Or, a Model 7252i could
include a 10 inH2O (25 mbar) range and
2 500 psi (172 bar) to cover very low and very
high pressure calibration requirements. Only
Fluke Calibration provides such a broad pressure
range coverage factor in a dual output pressure
controller. Please refer to the back page for acomplete list of pressure ranges.

For absolute mode calibrations, the Series 7252 can besupplied with a Barometric
Reference option, or theVacuum Reference option
where a vacuum pump isconnected to the reference
Series 7252s features a unique fusedquartz sensor. This rugged transducer offersport(s). While the former
unequalled precision and a stability ofoffers a high degree of
0.0075% of reading per year.
convenience by allowing
instantaneous transition fromgauge to absolute mode, the Vacuum Reference option provides the ultimate performancesolution, since it does not introduce the additional uncertainty of a secondary, barometricsensor. Instruments with the Vacuum Reference
option include an on-board vacuum sensor toallow fully automatic zeroing when operating inabsolute mode. For applications where absolutecalibrations are performed exclusively, permanent absolute ranges to 50 psia (4 bar) areavailable. The Series 7252 also provides negative gauge operation to support the calibration ofa wide variety of test devices and applications.
The Series 7252 is a dual output pressure
controller, which increases throughput, whileproviding maximum stability for each range.
With simultaneous pressure control, it can actually perform two calibrations at the same time.
For Series 7252’s configured with dual
ranges between 10 (1 bar) and 1 000 psi(70 bar), the two test ports can be interconnected. The instrument will then auto range
from the lowest to the highest sensor and viceversa. For performing single calibrations, thisfeature provides a high degree of performanceover the full range.
Increased throughput is also accomplished
via the digital control valve technology, thatensures fast control speed with no overshoot.
For example, each range will control in 10 %increments in 15 seconds, or less, into a
245 cubic centimeters (15 cubic inch) volume.
No other controller combines this speed coupledwith no overshoot control.
For ease of use, the large, bright, active
matrix color display provides the operator withmenus that are presented in plain text with alogical navigation structure similar to all otherRuska digital pressure controllers and indicators,
with multi-lingual support.

2 Fluke Calibration

Series 7252 Ruska Dual Output Digital Pressure Controllers

Automating pressure test andcalibration
The Model 7252i and Model 7252 are easy
to use and can automate your calibrations inseveral ways:• Step up/down: For calibrations where theincrements are fixed intervals, enter a userdefined step value. The Series 7252 increases
or decreases the pressure by thestep amount with the jog dial—no lengthy
keystroke sequences to program.
• Sweep test: For simple exercising routines,
as with dial gauges, enter a start value, astop value and number of times to repeat thecycle. The Series 7252 will automatically
exercise the device under test prior to thecalibration run.
• Computer interface: Every Series 7252 isprovided with both an RS-232 and IEEE-488
interface, and all Series 7252’s syntax follow
SCPI protocol for easy programming. Intecal,
an off-the-shelf software package, is available in addition to a LabVIEW® driver, a freedownload. Firmware updates can also be
performed over the RS-232 interface (updates
can be downloaded from the website). A
MET/CAL driver is also an available option.

Versatility to handle any pneumaticpressure calibration
The Series 7252 is versatile enough to handle
almost any type of pneumatic pressure
calibration.
• Wide pressure range: The Series 7252 isavailable in a variety of full scale (FS) pressure ranges from 10 inH2O (25 mbar) to2 500 psi (172 bar).
• Pressure units/scales: Select from overfifteen standard units of measure, including
inHg at 0 °C and 60 °F, kPa, bar, psi, inH2O
at 4 °C, 20 °C and 60 °F, kg/cm2, mmHg at
0 °C, cmHg at 0 °C, and cmH2O at 4 °C, andtwo user defined units.
• Head pressure: The Series 7252 automatically corrects for head pressure differences.
• Autovent and autozero: With a few keystrokes, the Series 7252 will vent the test
port to atmosphere or automatically zero itself(autovent is not applicable to permanent
absolute models).
• Protection of the device under test: Set
upper and lower pressure limits to ensure
protection of the device under test.

Specifications
General

Total uncertainty

Electrical power

90/260 V ac, 50/60 Hz, 150 W

Temperature

Operating: 18 °C to 36 °C (64 °F to 97 °F)
Storage: -20 °C to 70 °C (-4 °F to 158 °F)

Humidity

5 % to 95 % RH, non-condensing

WeightSeries 7252/7252i: 9 kg (20 lb)

Dimensions (H x W x D)

All versions: 178 mm x 419 mm x 483 mm (7 in x 16.5 in x 19 in)

Pressure medium

Nitrogen or clean dry air

Display

TFT, VGA, active matrix, 162.5 mm (6.4 in) 640 x 480 resolution,
65,000 colors

Test port and supply
connection

1/4 in NPT femaleWarm up time

2 to 3 hours; may be left on indefinitely

The maximum deviation from the true value of pressure including
precision, stability, temperature effects and the calibration standard is:Model 7252i

Ranges 0.36 psi to 2500 psi (25 mbar to 172 bar)
(25 % to 100 % FS)
90 day: 0.006 % reading
1 year: 0.009 % reading

Series 7252

Ranges 5 psi to 2500 psi (400 mbar to 172 bar)
90 day: RSS 0.003 % FS + 0.002 % reading
1 year: RSS 0.003 % FS + 0.0075 % reading

Control parameters

Volume: 82 c3 to 980 c3 (5 in3 to 60 in3)
Control low limit:
0 psi (0 mbar) gauge
0.15 psi (10 mbar) absoluteStandard pressure ranges

Communications

Model 7252i

RS-232 and IEEE-488, SCPI syntax

Select two of any full scale (FS) pressure range from 5 psig to
2 500 psig (400 mbar to 172 barg), or permanent absolute range from15 psia to 50 psia (1 to 4 bara). Low Pressure (LP) ranges starting at
10 inH2O (25 mbarg) are also available. Please refer to the 7250LP
data sheet for additional information on LP ranges and specifications.

MET/CAL® driverOptionalLabView® driver

Optional

Firmware updates are performed via RS-232 interface

Model 7252

Select two of any FS pressure range from 5 psig to 2 500 psig(400 mbar to 172 bar). Or, any permanent absolute range from15 psia to 50 psia (1 bara to 4 bara).

Languages

Optional modes

Absolute using barometric reference sensor for ranges from 15 psig to
2 500 psig (1 bar to 172 bar)

Options

Absolute using Vacuum Reference option for ranges from 5 psig to
2 500 psig (400 mbar to 172 bar)
Negative gauge
Performance
Precision

Model 7252i: Ranges from 5 psi to 2 500 psi (400 mbar to 172 bar)
From 25 % to 100 % FS: 0.005 % of reading
Below 25 % FS: 0.005 % of 25 % FS
Model 7252: Ranges 5 psi to 2500 psi (400 mbar to 172 bar)
0.003 % of FS
Model 7252i: 0.36/1 psi (25/70 mbar) range: 0.005 % of readingfrom 10 % to 100 % of maximum FSStability

0.0075 % of reading per year

Display resolution

User selectable to 1:1,000,000

Control stability

Active mode: 0.001 % of each range

The Series 7052 is capable of displaying menus and functions in:English, French, Chinese, German, Japanese, Spanish and Italian
Barometric reference (absolute and negative gauge)
Vacuum reference* (absolute)
Negative gauge only
NVLAP accredited calibration
Rack mount kit
MET/CAL driver
Intecal software
Liquid trap assembly
Precision
Precision is defined as the combined effects of linearity, repeatability andhysteresis throughout the operating temperature range.
Expression of uncertainty conforms with the recommendations of the ISO
Guide to the Expression of Uncertainty in Measurement.
*Requires external vacuum pump

0.36/1 psi (25/70 mbar) range: 0.004 % of each range
Passive mode: No additional uncertainty
Control response

15 seconds or less with zero overshoot into a 245 c3 (15 in3) volume in
10 % increments

Negative gauge
precision (optional)

Model 7252i: 0.005 % of 25 % FS or 0.0005 psi* (0.0345 mbar)*Whichever is greater
Model 7252: 0.003 % of positive FS

Barometric Reference(optional)

0.002 psi (0.1379 mbar) maximum error per year

Vacuum Reference(optional)

0.0002 psi (0.014 mbar) maximum error per year

Fluke Calibration.	Precision, performance, confidence.™

Calibration
A calibration report with traceability to National Institute of Standards and Technology (NIST)
is provided. Fluke Calibration calibrates all Series 7252’s with the Model 2465 (0.0010 % ofreading) to 1 000 psi (70 bar) and the Model 2470 (0.0011 % of reading). Gas piston gauge
above 1 000 psi (70 bar). A NVLAP accredited calibration is available.

Fluke Calibration
PO Box 9090, Everett, WA 98206 U.S.A.
Fluke Europe B.V.
PO Box 1186, 5602 BD
Eindhoven, The Netherlands
For more information call:In the U.S.A. (800) 443-5853 orFax (425) 446-5116
In Europe/M-East/Africa +31 (0) 40 2675 200 or
Fax +31 (0) 40 2675 222
In Canada (800)-36-FLUKE or
Fax (905) 890-6866
From other countries +1 (425) 446-5500 or
Fax +1 (425) 446-5116
Web access: http://www.fluke.com©2010 Fluke Calibration.
Specifications subject to change without notice.
Printed in U.S.A. 8/2010 3833814A D-EN-N

3 Fluke Calibration

Series 7252 Ruska Dual Output Digital Pressure Controllers

Modification of this document is not permitted
without written permission from Fluke Calibration.