Atec Fluke-7250 User Manual

Controller/Calibrator

Technical Data

Features

• Pressure ranges from 0 to 5 and 0 to
3 000 psi (0 to 35 kPa and 0 to 21 MPa)

• Model 7250xi and 7250i provide advanced
precision of 0.005 % of reading

• Model 7250 provides 0.003 % of full scale
precision

• Stability: 0.0075 % of reading per year

• Time to setpoint: 20 seconds with no

overshoot

• Control stability: 10 ppm

• Active matrix color screen with enhanced

navigation menus

• Languages: English, French, Chinese,
German, Japanese, Spanish and Italian

The Series 7250 high speed digital pressure
controllers represent the fifth generation of
automatic pressure controllers from Fluke Cali­bration and offers unmatched performance, an
active matrix color screen and enhanced control
stability. Utilizing multiple sensors and ranges in
a single instrument, the Series 7250 combines
precision, stability, speed and affordability.
Models 7250xi, 7250i and 7250, up to
2 500 psi (17.2 MPa), use a unique quartz
sensor, the most accurate pressure sensing
technology in a pressure calibrator. Each quartz
sensor is manufactured and tested to provide
the ultimate performance required by a Fluke
Calibration pressure calibrator, ensuring that
every customer receives quality, precision and
stability in their instrument.

Advanced precision

Models 7250xi and 7250i offer advanced per­cent of reading precision for increased capability
with a single instrument, reducing the invest­ment required to calibrate a wide variety of
pressure devices and ranges. The Model 7250xi
provides 0.005 % of reading precision from
5 % to 100 % of the instrument’s range. This

unmatched precision is achieved through unique
quartz pressure sensing technology and mul­tiple quartz sensors in a single instrument. The
7250xi is available with any full scale range
from 20 to 2 500 psi (140 kPa to 17.2 MPa). The
Model 7250i provides 0.005 % of reading from
25 % to 100 % of range and is available with
any full scale range from 5 to 2 500 psi
(35 kPa to 17.2 MPa).

For pressure below the lower threshold of
5% for the 7250xi and 25 % for the 7250i, the
precision becomes 0.005 % of the lower value.
For example, a 1 000 psi (7 MPa) Model 7250xi
provides 0.005 % of reading from 50 to 1 000
psi (35 kPa to 7 MPa); the precision for pressures
from 0 to 50 psi (0 to 35 kPa) is 0.005 % of
50 psi (35 kPa).

Selecting the full scale range of the 7250xi
and 7250i to purchase is simplified with the
percent of reading capability. Simply determine
the highest pressure required and then decide if

0.005 % of reading is required down to 25 % or
5 % to maintain the appropriate calibration ratio.
The complex analysis associated with selecting
the appropriate single or multirange instruments
with percent of full scale performance is no

longer required. And, since the performance of
the 7250xi and 7250i is continuous throughout
the range, the time consuming task of control­ling to atmosphere and switching ranges is
eliminated.

The 7250xi and 7250i not only provide
unequalled precision, but also excellent long
term stability due to the inherent properties of
quartz in combination with several enhance­ments implemented over the last few years. The
total uncertainty of the 7250xi and 7250i over
a one year calibration interval is 0.009 % of
reading down to 5 % and 25 %, respectively (see
the table, above right). Simplified specifications
eliminate guesswork and “specmanship” to
allow you to determine the actual performance
delivered with every instrument.

Standard precision

For applications that do not require the level of
performance provided in the 7250xi or 7250i,
the Model 7250 offers an economical approach
to automatic pressure testing and calibration
with a precision of 0.003 % of full scale for
ranges to 2 500 psi (17.2 MPa).

High pressure precision

For applications that require pressures up to
3 000 psi (21 MPa), the Model 7250HP provides
total uncertainty (one year calibration interval)
of 0.013% of reading down to 30% of the full
scale. The 7250HP provides the high speed
control and performance of the standard 7250
with a full scale pressure range of 3 000 psi
(21 MPa) absolute.

The Series 7250 features a unique fused­quartz sensor. This rugged transducer offers
unequalled precision and a stability of

0.0075 % of reading per year.

High-speed pressure
control

All Series 7250 instruments
up to 2 500 psi (172 bar) reach
setpoint in 20 seconds or less
into a 15 cubic inch (245 cc)
volume, with no overshoot, to
allow high-speed pressure test
and calibration.

Dual control modes

The Series 7250 also provides
two user-selectable control
modes: active and passive

mode. In active mode, the 7250 is continually
maintaining the setpoint and can compensate
for small leaks and pressure changes due to
temperature. In passive mode, the user defines
a control band and the 7250 will turn off the
controller once it achieves the setpoint within
the control band. In a leak-free and tempera­ture-stable system, passive mode contributes
no additional uncertainty, providing optimum
performance.

Automating pressure test and
calibration

The 7250xi, 7250i and 7250 are easy to use and
can automate your calibrations in several ways:

Step up/down: for calibrations where the
increments are fixed intervals, enter a user­defined step value. The Series 7250 increases
or decreases the pressure by the step amount
with the jog dial—no more lengthy keystroke
sequences to program.

Sweep test: for simple exercising routines,
as with dial gauges, enter a start value, a stop
value, and number of times to repeat the cycle.
The Series 7250 will automatically exercise the
device under test prior to the calibration run.

Onboard programs: For frequently used or
lengthy calibrations, the Series 7250 can store
up to 20 user-defined programs/profiles with up
to 1000 steps total in internal memory.

Computer interface: Every Series 7250 is
provided with both an RS-232 and IEEE-488
interface, and Series 7250 syntax follows SCPI
protocol for easy programming. COMPASS®,
an off-the-shelf software package is avail­able in addition to the LabVIEW® driver, a free
download and optional MET/CAL® driver. As
a standard feature, software written for the
previous generation Series 7215, 7010 and 6000
instruments is fully supported by the Series

7250. The Series 7250 can also be set to 510
emulation mode to use software originally writ­ten for the DPI 510. Firmware updates can also
be performed over the RS-232 interface.

Versatility to handle any pneumatic
pressure calibration

The Series 7250 is versatile enough to handle
almost any type of pneumatic pressure
calibration.

Wide pressure range: available with any full
scale pressure between 5 and 2 500 psi (35 kPa
and 17.2 MPa) or for higher pressures select the
3 000 psi absolute (21 MPa) range.

2 Fluke Calibration Series 7250 Ruska Pressure Controller/Calibrator

Pressure units/scales: Select from over
twelve 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, and two user­defined units.

Head pressure: Automatic correction for head
pressure differences

Absolute mode: The 7250i and 7250 offer
three different methods to make absolute pres­sure measurements. The barometric reference
option provides the most convenient method
and is available on ranges 15 psi (1.0 bar) and
higher. Alternatively, the vacuum reference
option allows the connection of an external
vacuum pump to the reference port of the
instrument. An onboard vacuum sensor monitors
the reference vacuum and allows for automatic
zeroing in absolute mode. This option provides
the lowest overall uncertainty since it does not
include the additional uncertainty of a second­ary barometric reference sensor. For pressure to
50 psia (350 kPa) permanent absolute models
are also available. The 7250xi is only available
with the barometric reference option for abso­lute measurement.

Autovent and autozero: With few keystrokes,
the Series 7250 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.

The large color display allows the pressure value to be displayed even
when viewing a submenu selection such as the units selection screen
shown above.

Options

The Series 7250 can be provided for gauge
mode operation, or with:

• Optional vacuum (negative gauge) mode for

bidirectional devices

• Optional barometric reference for absolute

mode calibrations

• Permanent absolute ranges to 50 psia (350

kPa) full scale which include a tare feature for
simulated gauge mode operation

The Series 7250 Pressure Controller/Calibrator
can easily automate your test and calibration
workload. All are easy to use, easy to main­tain, and have the reliability, performance and
features that you want. The Series 7250 features
an easy-to-navigate menu structure with full
text descriptions for menus and commands.

3 Fluke Calibration Series 7250 Ruska Pressure Controller/Calibrator

All Series 7250s are fully programmable and can store up to 20
separate programs with up to 1000 steps.

Specications

General

Temperature Operating: 18 °C to 36 °C (64 °F to 96 °F)

Storage: -20 °C to 70 °C (-4 °F to 158 °F)
Humidity 5 % to 95 % RH, non-condensing
Weight Model 7250/7250i: 7.7 kg (17 lb)

Model 7250xi: 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 female

Warm up time 2 to 3 hours; may be left on indefinitely

Pressure ranges

Model 7250xi Any Full Scale pressure range from 20 psig to 2 500 psig (140 kPa to

Model 7250i Any Full Scale pressure range from 5 psig to 2 500 psig (35 kPa to 17.2 MPa).

Model 7250 Any Full Scale pressure range from 5 psig to 2 500 psig (35 kPa to 17.2 MPa).

Optional modes Absolute using barometric reference sensor for ranges from 15 psig to

17.2 MPa).

Or, Permanent Absolute ranges from 15 psia to 50 psia (100 kPa to 350 kPa

absolute).

Or, Permanent Absolute ranges from 15 psia to 50 psia (100 kPa to 350 kPa

absolute). For ranges below 35 kPa (5 psi), see the 7250LP.

2 500 psig (100 kPa to 17.2 MPa)

Vacuum (negative gauge)

Vacuum reference (requires external vacuum pump)
Model 7250HP 3000 psi absolute (21 MPa absolute)

Performance

1

Precision

Model 7250xi: From 5 % to 100 % full scale (FS): 0.005 % of reading

Below 5 % FS: 0.005% of 5% FS

Model 7250i: From 25 % to 100 % FS: 0.005 % of reading

Below 25 % FS: 0.005 % of 25 % FS

Model 7250: Ranges to 2 500 psi (17.2 MPa): 0.003 % of FS

Model 7250HP: 0.012% of reading or 0.0036% FS, whichever is greater
Stability Ranges 2 500 psi (17.2 MPa): 0.0075 % of reading per year

Control stability Active mode: 0.001 % FS (10 ppm)

Display resolution User selectable to 1:1,000,000
Control response 20 seconds or less with zero overshoot into a 245 cm

3 000 psia (21 MPa) range: 0.005% of reading

Passive mode: no additional uncertainty

to 2 500 psi (17.2 MPa)

(15 in3) volume for ranges

60 seconds for 3 000 psia (21 MPa) range
Negative gauge

precision (optional)

Model 7250xi: 0.005 % of 5 % FS or 0.00075 psi (0.05 mbar), whichever is

greater

Model 7250i: 0.005 % of 25 % FS or 0.0075 psi (0.5 mbar), whichever is

greater

Model 7250: 0.003 % of FS

Model 7250HP: Not applicable
Barometric reference

(optional)
Vacuum reference

(optional)

0.002 psi (0.014 kPa) maximum error per year

0.0002 psi (0.0014 kPa) maximum error per year (Only available on 7250i

and 7250)

Calibration

An accredited calibration report is provided standard. For information on the calibration uncertainty,
please see the appropriate Fluke Calibration Scope of Accreditation.

Total Uncertainty (k=2)

Model 7250xi 5 % to 100 % FS

Model 7250i 25 % to 100 % FS

Model 7250 90 day: 0.003 % FS + 0.002 % reading

Model 7250HP 30 % to 100 % FS

Control parameters

Volume 82 cm to 980 cm (5 in
Low Control (ab-

solute)

2

90 day: 0.006 % reading
1 year: 0.009 % reading

90 day: 0.006 % reading
1 year:0.009 % reading

1 year: 0.003 % FS + 0.0075 % reading

90 day: 0.012% reading
1 year: 0.013% reading

3

to 60 in3)

0.15 psia (1 kPa)

Communications

RS-232 and IEEE-488, SCPI syntax. Series 7215, Model 7010, Series
6000 and DPI 510 emulation are standard.

®

MET/CAL

driver Optional

®

LabView

driver Optional

Firmware updates are performed via RS-232 interface

Languages

The Series 7050 is capable of displaying menus and functions in:
English, French, Chinese, German, Japanese, Spanish and Italian

Options

Barometric reference (absolute and vacuum)
Vacuum mode (negative gauge)
Vacuum reference (requires external vacuum pump)

Accessories

3911197 Transportation Case with Wheels and Handles
3879677 Rack mount kit for 19 in. EIA cabinets, 24 in. deep
3879689 Rack mount kit for 19 in. EIA cabinets, 30 in. deep
3876298 Lines and Fittings Kit

4014713 Vacuum Pump with auto-vent, 85 liters/minute
3876271 Liquid Trap
3891089 MET/CAL Pseudo-Driver
3070175 COMPASS for Pressure Enhanced, Single License

Model 7250i Uncertainty (2 sigma)

Precision 0.005 % of reading
Stability (one year) 0.0075 % of reading
Calibration standard 0.0010 % of reading
Environmental temperature

(included in precision)

0.000 % of reading

Head pressure 0.001 % of reading
Expanded uncertainty (2

sigma)

1

Precision is defined as the combined effects of linearity, repeatability

and hysteresis throughout the operating temperature range.

2

Total uncertainty is the maximum deviation from the true value of
pressure including precision, stability, temperature effects and the
calibration standard. This assumes routine zeroing of the instrument.
Expression of uncertainty conforms with the recommendations of the
ISO Guide to the Expression of Uncertainty in Measurement.

0.009 % of reading

Fluke Calibration. Precision, performance, confidence.

Fluke Calibration
PO Box 9090, Everett, WA 98206 U.S.A.

Fluke Europe B.V.
PO Box 1186, 5602 BD
Eindhoven, The Netherlands

4 Fluke Calibration Series 7250 Ruska Pressure Controller/Calibrator

For more information call:
In the U.S.A. [phone] or
Fax [phone]
In Europe/M-East/Africa +31 (0) 40
2675 200 or Fax [phone]
In Canada (800)-36-FLUKE or
Fax [phone]

™

From other countries [phone] or
Fax [phone]
Web access: http://www.flukecal.com

©2010 Fluke Corporation.
Specifications subject to change without notice.
Printed in U.S.A. 9/2011 3833773B D-EN-N

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