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GE Energy
Dresser*Calibration Benches
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Introduction
GEs Energys Dresser Calibration Benches are
designed or the testing and calibration o com-
monly used gas meters including diaphragm,
rotary and turbine and some types o ultrasonic
meter. The Dresser Calibration Benches can be
operated manually, automatically and remotely
(including active online support rom GE energy
and the Dutch Metrological Institute NMi upon
request). The Dresser Calibration Benches employ
innovative technology to deliver perormance.
Operating Principle
The Dresser Calibration Bench uses a number o
G650 Pulsation Free Rotary meters (RM-TWIN) and
a G16 Rotary meter in parallel as master meters,
to measure the volume passed through the
Meter-Under-Test (MUT). With an approved range
o 20 - 1000 m3/h or the G650 RM-TWINS each
and 0,5 - 25 m3/h or the G16 rotary meter, the
range o the Calibration Bench is summarized
as ollows:
CC1000: 0,5 - 1000 m3h.
CC2000: 0,5 - 2000 m3/h.
CC3000: 0,5 - 3000 m3/h.
CC4000: 0,5 - 4000 m3/h.
The application o Pulsation Free Rotary meters
in-parallel is commonly used in advanced
Calibration Systems all over the world. As shown
in the image below, the primary high pressure
reerence meter (Trasys = Traceability System) o
NMi is based on a parallel operation o ive pulsation
ree rotary meters.
The Dresser Calibration Benches can produce results
with an overall uncertainty better than 0,25% with
traceability to the NMi.
GE Energy continues to improveon gas metering and fow controlequipment with innovative ideasand sophisticated technology andmodular designs.
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Maintainable Metrology
The Dresser Calibration Bench incorporates
technology that allows users to monitor and maintain
system metrology. Our operating system checks
metrology at a series o overlapping low ranges
during normal operation. The system also cross
checks accuracy at the Master Meter and Meter
under test or with a Dresser or NMi calibrated
reerence meter.
Sufficient Overlap: The G16 and G650 have an
overlapping range in which comparison with the
Meter Under Test (MUT) must generate the same
results.
Continuous Cross Checking: During each test, the
MUT can be compared with all the individual masters
meters giving an indication about the ongoingperormance and accuracy o the test bench.
Reference package: When a reerence package
is used, consisting o a calibrated rotary meter
G16, G160 Twin and a G650 turbine, each Dresser
Calibration Bench can be checked/veriied/validated,
to meet metrology requirements. (Common practice
is to veriy the installation on a regular bases, unless
the cross checking-as mentioned earlier-generates
doubtul results.) This operation-just install the
Reerence meters and consider them as the MUT-can
be done locally by the operator o the Calibration
Center.
To report the traceability to recognized Notiied Bodies
(NB) such as NMi, a regular comparison with reerence
meters o the notiied body is required. To reduce
operational cost and maximize the availability o the
Dresser Calibration Bench, NMi can veriy the entire
installation with a highly accurate reerence meter
consisting o a 10-points calibrated G16 a
G160 TWIN and a G650 turbine. For more detailed
inormation regarding veriication and validation
using a reerence meter the NMi or the localGE representative can be contacted.
Header/Damping Device
FlowControl
Header/Damping Device
Veriication using Local Transer Module 0,5 - 1000 m 3/h
25
1000TWIN
251000TWIN
1000TWIN
1000TWIN
1000TWIN
Header/Damping Device
Header/Damping Device
251000TWIN
1000TWIN
1000TWIN
1000TWIN
MUT
FlowControl
Continuous Comparison at 20 - 25 m3/h (overlap)Continuous Comparison by run switching
Veriication using MNi Transer Module 0,5 - 1000 m3/h
Header/Damping Device
FlowControlHeader/Damping Device
25
1000TWIN
251000TWIN
1000TWIN
1000TWIN
1000TWIN
For less advanced, more traditional test benches not
using parallel master meters, veriication/validation is
rather expensive and time consuming since a number
o large size reerence meters are needed to veriy and
validate the acility. In most cases, these reerence
meters are to be brought in rom ar away.
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In the outlet section o the MUT as well as each
Master Meter, a temperature sensor is installed to
correct the low according to the law o Boyle-Gay-
Lussac. To eliminate inluences o pressure luctua-
tions, the pressure at the MUT and the Master Meter
is compared to a dP-cell instead. Barometer pressureis measured and applied in the error calculations.
To minimize the eect o temperature and pressure
changes, each second the data is retrieved rom the
sensors and averaged in the error calculations.
The Dresser Calibration Benches are itted with an
automatic leakage control using compressed air,
to pressurize the piping in between the MUT and
the Master Meters. During the leakage testing, the
variations in pressure are monitored. In each Master
Meter Run two butterly (block) valves guarantee
leak tightness. A small leakage will cause additionalerrors especially when the low rate is low. The use o
two such block valves is in accordance with the PTB
guidelines or test benches.
A part o the required outlet section o the turbine
meter as MUT has been integrated into the header.
All the smaller size connection langes including the
required straight outlet section o the turbine meter
as MUT are connected to this basic lange connec-
tion. These connection spool pieces are optional and
have to be customer speciied at order or can be
made locally (a set o drawings is part o the scope osupply). Each connection spool piece has been itted
with a temperature tapping.
Rotary meters as MUT will generate pulsations,
except or pulsation ree designs like the Dresser
Series RM-TWIN. The pulsation orms a longitudinal
wave in the adjacent piping and can aect the
accuracy o the calibration. To reduce the eect o the
longitudinal wave a damping device is installed. The
volume and the internal shape o this damping device
(header) eliminate the eect o the pulsation. To reduce
the eect o pulsation at the inlet o the rotary meter
(MUT) it is essential that the meter is tested with anopen inlet. In this case, the entire test room is used as
damping device.
The Calibration Bench blower, able to reach a dP o 80
mbar over a large low range is sucking the air through
the Master Meters and MUT. The dP o 80 mbar enables
serial testing o meters. To reduce electrical energy
dissipation, the low rate is adjusted by means o
requency control. The controller is placed in a electric
cabinet sized or low rates, less than 1000 m3/h, two
pneumatically activated valves (6 butterly and 1 1/2
plug) as shown on igure 11, are used. During testingthe air low controls the requency and the position o
the valves are ixed to provide a steady low.
Human Machine Interface (HMI)
During test set-up the operator is guided by the HMI
(Human Machine Interace) sotware, and can select
rom a menu o predeined meters and test runs. Once
test set-up is complete the Dresser Calibration Bench
will run through each test, automatically changing low
rates or each test, processing and storing relevant test
data. When the test is complete the operator can print adetailed report. The Dresser Calibration Bench sotware
runs on a dedicated PC, and includes several security
levels.The HMI consists o:
PC with test bench sotware including backup
o relevant data
20 screen monitor
Mouse and keyboard
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Advanced Electronic
The Dresser Calibration Bench uses an advanced
time-measurement to determine the passed volume
through the MUT and the Master Meters. This time-
measurement reduces the time or testing the MUT andprovides increased daily throughput o the calibration
bench. All sensors are connected to an industrial PLC,
this PLC measures and calculates the time and all
relevant data such as temperature and pressure It
switches all mechanical devices such as the valves. The
PLC is connected with the PC. Through the PC one can
arrange the settings o the operational parameters or
the test bench itsel and the MUT (such as the sequence
or type o the test run) and the reporting, displaying,
evaluation and validation o the results.
XP Platform HMI
Software Features:
System based on MS Windows** XP Proessional
Test program or turbine-and rotary gas meters
Menu-controlled user guidance
Graphical process display
Screen output o all process data
Automatic storage o all meter data on hard disk
Measuring data protocol on screen and printer
Ergonomic menus with extended tree structure
Special User Guidance Menu
Complex User-Rights-Management. Rights can be
deined or each user (Dierent user classes like
operator, administrator, metrological authorities,
management, etc.)
All parameters can be set in the program
(depending on user rights)
Dierent meters and preerred test sequence can be
deined, copied and implemented
Parameters or test sequences can be change during
running the test
Integrated Tool List & Label or complex protocol
deinitions, an unlimited number o protocols (e.g.
dierent languages) can be deined
Basic statistics eatures o all tested meters
Remote Control Sotware
Input masks with extended plausibility checks
Integrated database or all parameters and results
Integrated diagnostics or test bench unctions
Technical Data Master Meters Sensors
Rotary Meter RM G16 Range: 0,5 - 25 m3/h
Repeatability: better than 0.05% Construction: single set impeller concept
2 HF with Reerence Disc
Rotary Meter RM-TWIN G650 Range: 20 - 1000 m3/h
Repeatability: better than 0.05 %
Construction: Pulsation Free TWIN
2 HF with Reerence Disc
Temperature Sensor
Range: 0 - 40C Repeatability: better than 0.05C
4 wire PT100
dP Sensor
Range: 0 - 50 mbar
Repeatability: better than 0.1 mbar
Absolute Pressure Sensor Range: 900 - 1100 mbar
Repeatability: better than 1 mbar
Technical Data iMCC
Skid and headers Steel, RAL painted
Outlet Header inside isolated (damping)
Valves Type: Butterly (Block and Bleed)
Size: 6 (150 mm)
Actuator: Double Acting Pneumatic
Minimum Pressure: 5 bar
Filters Wire Mesh 150 micron
Stainless steel
Blower/Frequency Control: Blower: Rotamill, maximum dierential pressure
80 mbar, power consumption approx. 15 KW
Frequency converter: SEW Movidrive
Rittal Cabinet (W=800)
Blower/Frequency Control Blower: maximum dierential pressure 80 mbar,
power consumption approx. 15 KW
Frequency converter
** Registered trademark o Microsot Corporation.
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Control Valves Plug Valve: Electronically/Pneumatically actuated
Butterly Valve: Electronically/Pneumatically
actuated
Technical Data Dresser Calibration Bench
Electronics Electric Cabinet
Power Consumption: approx. 2KW
Technical Data PC Keyboard, Mouse (English Version)
Windows XP Pro. (English Version)
Remote-Control Sotware
CC1000 CC2000 CC3000 CC4000
Master RM 1 1 1 1
Master RM-Twin G650 1 2 3 4
Total Range (m3/h) 0,5 - 1000 0,5 - 2000 0,5 - 3000 0.5 - 4000
Overall Uncertainty
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TS: Calibration Bench9.11
GE Energy
Dresser Meters & Instruments
16240 Port Northwest Dr., Suite 100
Houston, TX 77041
P: 832.590.2303
F: 832.590.2494
7051HS Vasserveld
The Netherlands
P: +31 (0) 31527 1100
F: +31 (0) 31527 1105
Visit us online at:www.ge.com/energy
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All Rights Reserved