sentinel specification
GE
Sensing & Inspection Technologies
Sentinel
Panametrics Custody Transfer Gas
Ultrasonic Flowmeter
Applications
The Sentinel flowmeter is a complete ultrasonic
flowmeter system for the measurement of natural
gas flow applications such as:
• Custody transfer
• Transmission and distribution
• Underground storage
• Pipeline balancing
• Power systems
• Gas processing
• Compressor station metering
• Gas production
• Fuel monitoring
g
Features
• Netherlands Measurement Institute (NMi) approval
• Compliant with AGA Report #9
• Accuracy 0.1% of reading
• Isolated from upstream flow disturbances
• 40:1 or better turndown ratio
High Accuracy for Custody―Transfer
Applications
The Sentinel ultrasonic flowmeter is designed to meet
the high-accuracy requirements of AGA9 for natural gas
custody transfer, as well as the NMI pattern approval.
A Sentinel meter body is composed of a length of carbon
steel pipe with flanged ends, rated to the pressure
requirements of the individual installation, and two pairs
of pre-installed ultrasonic transducers. The system is
factory assembled and tested to ensure that it meets
strict quality control standards.
1.5
Advanced Ultrasonic Transducer
Technology―High Power for High
Velocity
The heart of ultrasonic measurement is the transducer.
The Sentinel T11 transducer is specifically designed
for natural gas applications. Our transducers provide
high transmission power through the gas, ensuring
optimal performance under high flow conditions of
up to 118 ft/sec (36 m/s). The robust all-welded metal
design ensures resistance to corrosion and pressure
cycling. The transducer frequency is matched to the
pipe size of the system ordered. In addition, the Sentinel
transducer holder includes unique acoustic isolation
characteristics that allow optimal performance, even in
noisy applications such as wet natural gas.
Percent Error
1.0
0.5
0.0
-0.5
-1.0
-1.5
0.0
10.0
20.0
30.0
40.0
6 in NMi certification
6 in unit #2
6 in unit #3
8 in China pattern approval
12 in NMi certification
16 in Unit #1
AGA9 limits
50.0
60.0
70.0
80.0
90.0
100.0
Percent of Maximum Flow
Sentinel T11 transducer
Sentinel performance plots, various size flow cells
How Correlation Transit-Time™
Measurement Works
1.5
Ultrasonic transducers are installed in the meter body,
one upstream of the other. The transducers send and
receive ultrasonic pulses through the fluid. The meter
measures the difference between the upstream and
downstream transit times, and uses digital signal
processing and correlation detection to calculate velocity
and volumetric flow rate.
Percent Error
1.0
0.5
0.0
-0.5
-1.0
-1.5
0.0
10.0
20.0
30.0
725 psi (50 bar)
290 psi (20 bar)
116 psi (8 bar)
AGA9 limits
40.0
50.0
60.0
70.0
80.0
Percent of Maximum Flow
90.0
100.0
Downstream
transducer
Upstream
transducer
Sentinel performance plots, same flow cell at various pressures
Fluid
flow
Upstream
transducer
Ultrasonic
signal paths
Transit-time flow measurement technique
Downstream
transducer
System Design
Flow conditioning
plate (included,
but not shown)
A complete Sentinel system consists of the ultrasonic
meter, flow conditioner, and upstream/downstream
piping. This configuration removes the uncertainty
associated with installation effects (distorted flow
profile caused by valves, elbows, other piping system
components) on the overall meter performance. This
solution provides a simplified, yet cost effective metering
system without exposing the user to any additional risk
in measurement uncertainty. Customers can be assured
of accurate flow measurements because flow profile, a
major source of uncertainty if not fully developed and
uniform, is removed from the overall equation in the
ultrasonic flowmeter system.
Flow conditioning
plate (included, but
not shown)
Sentinel flowmeter
(included with system)
Pressure
transmitter tap
Temperature
transmitter tap
(3-diameter
downstream
minimum)
5-diameter
straight run
10-diameter
straight run
(included with system)
Sentinel flowmeter
(included with
system)
Pressure
transmitter tap
Flow conditioning Temperature
plate (included, transmitter tap
but not shown)
(3-diameter
downstream
minimum)
5-diameter
straight run
10-diameter
straight run
(included with
system)
10-diameter
straight run
(included with
system)
5-diameter
straight run
Bidirectional Sentinel flowmeter installation
Flow Conditioning System
The Sentinel system includes a flow profile conditioning
plate and a straight pipe run of ten diameters upstream
of the Sentinel meter body. The system requires the
customer to provide a minimum of five-diameter
straight pipe run both upstream and downstream of the
installation. When used in a bidirectional flow application,
the Sentinel system includes an additional flow profile
conditioning plate and ten diameters of straight pipe
run on the downstream side of the flowmeter. The
customer-provided five-diameter pipe runs upstream and
downstream are still required.
5-diameter
straight run
The Sentinel path configuration is designed such that a
minimum number of paths interrogates the maximum
area of the pipe, resulting in measurement stability
and superb repeatability. In addition, the meter uses no
bounced or multiple bounced paths susceptible to signal
distortion from build-up on walls and adversely affected
by ultrasonic noise (often from upstream piping and
valving) and high flow velocity. The straight single path
provides a solid measurement and maximizes the longterm performance of the meter.
2.0
1.5
Error, Percent
The Sentinel flow metering system operates with a
better than 5 Hz response rate, depending on pipe size,
using a sophisticated multi-mode signal processing
technique that delivers accurate and dependable meter
performance with high turndown. This fast sampling
ensures that system accurately measures flow under
dynamic and pulsating flow conditions.
1.0
0.5
0.0
-0.5
IGM Program Error Limits
-1.0
AGA9 Error Limits
-1.5
-2.0
0
5
10
15
20
25
Reference Velocity (ft/s)
30
35
Straight Run
Single Elbow
Double Elbow (In Plane)
Double Elbow (Out of Plane)
Double Elbow (Out of Plane) with Half Moon Obstruction
Corrected error percent vs. velocity, 10 in (25 cm) IGM spool with CPA-50E® (Name
CPA-50E used with permission), 3.5 Dup/10 Ddown, repeat runs
Performance in Air/Natural Gas (NG) at
Atmospheric Pressure
Meter performance can be verified in the field during
commissioning using atmospheric pressure air to ensure
the meter system is ready to go when needed. Thus,
customers will have a high degree of confidence in the
installation and performance of the meter prior to line
pressurization with natural gas.
Removable Transducer Option
The Sentinel flowmeter is available with optional isolation
valves on each installation port. This permits the removal
of transducers under process pressure. A single hydraulic
ram system is required for safety and to simplify the reinstallation process.
The Sentinel flowmeter electronics are preprogrammed
with all system setup information. The system is ready to
use as soon as the meter body is installed and the power
and meter communications are wired. No additional
setup or configuration are needed.
1 or 2 frequency
1 Alarm
2 Analog outputs (4 to 20 mA)
2 Analog inputs
RS485
Modbus
protocol
Energy content
(BTU)
Flow
computer
Pressure
Sentinel flowmeter
system
Monitor meter calibration
data collection, configuration
and security
RS232
or
RS485
Z
Corrected
volumetric
flow
cf
Energy
Although Sentinel is designed to operate at natural gas
transmission line pressures, it has been proven to work
well in air at ambient pressure. This is made possible
by Sentinel’s advanced ultrasonic transducers and the
associated electronics and signal-processing platform
used. There is no minimum pressure requirement for
proper operation of the metering system. In addition,
variable pressures exhibit virtually no effect on the
Sentinel’s flow measurement.
Convenient Installation
Super compressibility
Gas comp.
Temperature
PanaView™
instrument interface
software
Typical system configuration. PanaView software provides a communication
interface between the Sentinel system and a laptop PC.
PanaView™ Instrument Interface
Software
PanaView software facilitates communication between a
PC and the Sentinel system or other GE Sensing products.
This software monitors your Sentinel flowmeter to provide
a secure, comprehensive check on meter configuration
with a full audit trail. It also allows live flow readings and
tracking of flow diagnostics.
Example of PanaView display
Nominal
Pipe Size
Weight Flange Class (ANSI B16.5)
Face-to-Face
*Height ‘h’
*Width ‘w’
Distance
in (mm)
300 lb
600 lb
900 lb
in (mm)
in (mm)
in (mm)
4 (100)
236 lb (107 kg)
6 (152)
387 lb (176 kg)
270 lb (122 kg)
304 lb (138 kg)
32 (813)
35 (889)
34 (864)
473 lb (215 kg)
568 lb (258 kg)
45 (1143)
37 (940)
36 (914)
8 (203)
470 lb (213 kg)
593 lb (269 kg)
794 lb (360 kg)
48 (1219)
39 (991)
38 (965)
10 (254)
581 lb (264 kg)
832 lb (377 kg)
1048 lb (475 kg)
52 (1321)
42 (1067)
40 (1016)
12 (305)
731 lb (332 kg)
1014 lb (460 kg)
1401 lb (635 kg)
56 (1422)
44 (1118)
42 (1067)
14 (356)
905 lb (411 kg)
1331 lb (604 kg)
1881 lb (853 kg)
58 (1473)
46 (1168)
44 (1118)
16 (406)
1067 lb (484 kg)
1747 lb (792 kg)
2302 lb (1044 kg)
60 (1524)
48 (1219)
46 (1168)
18 (457)
1259 lb (571 kg)
2031 lb (921 kg)
3003 lb (1362 kg)
63 (1600)
50 (1270)
48 (1219)
20 (508)
1528 lb (693 kg)
2557 lb (1160 kg)
3765 lb (1708 kg)
67 (1702)
53 (1346)
50 (1270)
24 (610)
2255 lb (1023 kg)
3691 lb (1674 kg)
6386 lb (2897 kg)
74 (1880)
57 (1448)
54 (1372)
*Extra clearance needed for insertion mechanism
Nominal Pipe
Diameter
Velocity (ft/sec)
Actual Volumetric
Flow Rate (ACFM)
in (mm)
minimum
maximum
minimum
maximum
4 (100)
3.8
118
18
626
6 (152)
2.4
118
26
1420
8 (203)
2.4
118
46
2460
10 (254)
2.4
118
72
3877
12 (305)
1.5
89
64
4151
14 (356)
1.5
89
77
5017
16 (406)
1.5
89
101
6553
18 (457)
1.5
89
128
8295
20 (508)
1.5
89
158
10,307
24 (610)
1.5
89
228
14,908
Nominal Pipe
Diameter
Velocity (m/sec)
Actual Volumetric
Flow Rate (m3/hr)
in (mm)
minimum
maximum
minimum
maximum
4 (100)
1.15
36
34
1064
6 (152)
0.72
36
44
2416
8 (203)
0.72
36
76
4183
10 (254)
0.72
36
120
6593
12 (305)
0.45
27
106
7019
14 (356)
0.45
27
128
8483
16 (406)
0.45
27
168
11,082
18 (457)
0.45
27
213
14,027
20 (508)
0.45
27
264
17,430
24 (610)
0.45
27
382
25,209
h
w
Sentinel Specifications
For Pipe Sizes 4 in to 10 in (15 cm to 25 cm)
Meter is designed to meet or exceed the requirements of
AGA Report Number 9.
• Maximum actual measurable velocity:
±118 ft/s (±36 m/s)
• Minimum actual measurable velocity:
±2.4 ft/s (±0.72 m/s)
• Transitional flow velocity: 11.8 ft/s (3.6 m/s); QT = 10%
(QT = 15% for 4” meter size)
Fluid Types
For Pipe Sizes 12 in to 24 in (30 cm to 61 cm)
Operation and Performance
Natural gas (other gases available upon request)
Pipe Sizes
4 in to 24 in (100 mm to 600 mm)
• Maximum actual measurable velocity:
±88.6 ft/s (±27 m/s)
• Minimum actual measurable velocity:
±1.48 ft/s (±0.45 m/s)
• Transitional flow velocity: 8.86 ft/s (2.7 m/s); QT = 10%
Other sizes available upon request.
Meter Body Materials
Maximum operating gas pressure @ 176°F (80°C)
Carbon steel (A106 Gr. B or A333 Gr. 6) pipe section with
carbon steel (A105 or A350 LF2) flanges and fittings
Specify A333 Gr. 6 and A350 LF2 for low-temperature
service.
Maximum Error (Without Flow Calibration)
• ±0.5% between 0.1 Qmaximum* and Qmaximum
• ±1.0% between Qminimum and 0.1 Qmaximum*
Repeatability
• 0.08% between 0.1 Qmaximum* and Qmaximum
• 0.15% between Qminimum and 0.1 Qmaximum*
Resolution
0.003 ft/s (0.001 m/s)
Velocity Sampling Interval
0.2 seconds
Maximum Peak-to-Peak Error
±0.2% between 0.1 Qmaximum* and Qmaximum
*(0.15 Qmaximum for 4” meter size)
Zero Flow Reading
• <0.007 ft/s (.00213 m/s) for each acoustic path
• <0.01 ft/s (.00305 m/s) composite for all paths
Accuracy can be improved with high pressure NG flow
calibration.
Meter Performance
• Flow calibrated accuracy is 0.1% of reading relative to lab
• Absolute accuracy is 0.3% including lab uncertainty
Specifications assume 5 diameters upstream and 5
diameters downstream of straight pipe run in addition to
the pipe run and flow conditioning plates provided with
the Sentinel system, and a flow velocity greater than 5 ft/s
(1.5 m/s).
ANSI Flange Class
MAOP psig (bar)
300 lb
600 lb
900 lb
690 psig
(47 bar)
1381 psig
(95 bar)
2072 psig
(143 bar)
Electronics
Flow Measurement
Correlation Transit-Time mode
Enclosures
US: Epoxy-coated aluminum
Weatherproof Type 4, IP66
Class I, Division. 1, Groups B,C&D
FM and CSA
European: Flameproof
II 2 GD EEx d IIC
Dimensions
Main enclosure
Weight: 10 lb (4.5 kg),
Size (h x d): 8.2 x 6.6 in (208 x 168 mm)
Power Enclosure
Weight: 25 lb (11.3 kg),
Size (l x h x d): 15 in x 10 in x 8 in (381 mm x 254 mm x
203 mm)
Display
2-line x 16-character LCD display, LED backlight,
configurable to display up to four measurement
parameters in sequence
Power Supplies
Standard: 95 to 240 VAC ±10%, 50 to 60 Hz ±2%
Optional
Materials
17 to 32 VDC, ±10%
• Transducer: Titanium CP Gr. 2 (B348/B381)
• Transducer holder: Stainless steel 316/316L (A276)C
Power Consumption
20W maximum
Area Classifications
Operating Temperature
• North America: Explosion-proof Class I, Division 1,
Groups B,C,&D
• European: Flameproof II 2 G EEx d II
• PED 97/23/EC
–40°C to 60°C (–40°F to 140°F)
Storage Temperature
–55°C to 75°C (–67°F to 167°F)
Standard Inputs/Outputs
• Two 0/4 to 20 mA isolated outputs, 600 W maximum
load
• One frequency (HF) output, optically isolated, from DC
to 10 kHz maximum
• One hermetically sealed Form C alarm relay. Can be
applied to indicate flow direction or fault.
• Two isolated 4 to 20 mA inputs and 24 V loop power for
pressure and temperature
• Optional 2 HF outputs and two alarm output or 1 HF
output and 4 to 20 mA inputs
Digital Interfaces
• Bidirectional RS232 or RS485 link to PanaView Software
• RS485 Modbus® digital output
Audit Capacity
• Password security protected
• Log file of all critical parameters not erasable
• Totalizer hardware secured/seal
European Compliance
System complies with 73/23/EEC LVD (Installation
Category II, Pollution Degree 2), PED Cat III, Module H
Wetted T11 Ultrasonic Flow
Transducers
Temperature Range
–30°C to 80°C (–22°F to 176°F)
Pressure Range
• 300 lb ANSI flange class: 740 psig (51 bar) maximum
allowable operating pressure at 100°F (38°C)
• 600 lb ANSI flange class: 1,480 psig (103 bar) maximum
allowable operating pressure at 100°F (38°C)
• 900 lb ANSI flange class: 2220 psig (153 bar) maximum
allowable operating pressure at 100°F (38°C)
• Other pressure rating available upon request.
Transducer Cables
Integrated cables: Potted mineral insulated cable (North
America) or armored cable with ATEX-certified cable
glands (European)
Metrological Approval for Sentinel
NETHERLANDS
g
www.gesensinginspection.com
920-055E
© 2008 General Electric Company. All Rights Reserved. Specifications are subject to change without notice. GE is a registered trademark of General Electric Company. Other company or product
names mentioned in this document may be trademarks or registered trademarks of their respective companies, which are not affiliated with GE.
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