GE
Sensing
Applications
DigitalFlow
™
ISX878
Panametrics Liquid Flow
Ultrasonic Transmitter
DigitalFlow ISX878 is a Panametrics
product. Panametrics has joined
other GE high-technology sensing
businesses under a new name
_
GE Industrial, Sensing.
The DigitalFlow ISX878 is an intrinsically safe,
loop-powered, full-featured clamp-on ultrasonic flow
transmitter system for flow measurement of:
• Hydrocarbon liquids
• Petroleum products
• Lubricating oils
• Diesel fuel oil
• Chemicals
• Other liquids
Features
• Intrinsically safe
• Loop-powered
• Low power consumption
• Suitable for pipe sizes from 1/2 in to 16 in
(15 mm to 400 mm) diameter
• Six button keypad
• Large integral display
• Simple meter and transducer installation and setup
• Velocity, volumetric and totalized flow
• Economical non-intrusive flow measurement
g
GE
Sensing
The DigitalFLow ISX878 ultrasonic flow transmitter
combines the simplicity of a loop-powered meter
installation with proven, advanced clamp-on ultrasonic
flow transmitter technology. It provides customers with
an economical solution for flow measurement in pipes
up to 16 in (400 mm).
Two-Path Model
An optional second channel provides the capability to
obtain two-path averaging of the flow measurement, at
a single point for increased accuracy.
Uses the Transit-Time Flow
Measurement Technique
The Correlation Transit-Time™ technique uses a pair of
transducers with each transducer sending and receiving
coded ultrasonic signals through the fluid. When the fluid
is flowing, signal transit-time in the downstream direction
is shorter than in the upstream direction; the difference
between these transit-times is proportional to the flow
velocity. The DigitalFlow ISX878 measures the time
difference and uses programmed pipe parameters to
determine flow rate and direction.
Flowmeter Transducers
Fluid
Flow
Ultrasonic Signal Path
Transit-time flow measurement technique
Intrinsically Safe
The DigitalFlow ISX878 provides a low cost solution for
non-intrusive liquid flow measurement in your hazardous
locations. The DigitalFlow ISX878 is able to achieve an
intrinsically safe rating by significantly reducing the
amount of energy required to drive the ultrasonic
transducers. Reducing the drive voltage by a factor of 10
could only be made possible through advancements in
the ultrasonic transducers. The new ISXDR transducers
are considerably more efficient than our previous
piezoelectric models that led the market over the past
two decades.
CPT ISXDR
Small pipe transducers for 1/2 in to 4 in pipes
Lower Cost of Ownership
Intrinsic safety reduces installation costs by eliminating
the need for heavy explosion-proof junction boxes and
conduit. The reduced power usage also allows the
DigitalFlow ISX878 to be a loop-powered device, which
saves on installation costs. This becomes more important
where hazardous locations have significantly higher
costs for running power cables for an AC or DC unit. The
DigitalFlow ISX878 uses an available twisted pair of
instrument cables, fed through a safety barrier, to power
the unit. Since the meter clamps onto the outside of the
pipe, there is no need to shut down a line to install the
meter or to service it. The robust electronics and
transducers have no moving parts to break or wear
down, so annual maintenance can be significantly
reduced, if not entirely eliminated.
Voltage
GE
Sensing
ISX878
Specifications
Fluid Types
Acoustically conductive fluids, including water and most
hydrocarbon liquids. Maximum void fraction depends on
transducers, interrogation carrier frequency, path length
and pipe configuration.
Pipe Sizes
1/2 in to 16 in (15 mm to 400 mm) and larger
Pipe Wall Thickness
Up to 0.5 in (13 mm)
Pipe Materials
All metals and most plastics. Consult GE for concrete,
composite materials, and highly corroded or lined pipes.
Flow Accuracy (Velocity)
• Pipe ID≥6 in (150 mm); ±1% to 2% of reading typical
• Pipe ID≤6 in (150 mm); ±2% to 5% of reading typical
Accuracy depends on pipe size and whether measurement
is one-path or two-path. Accuracy to ±0.5% of reading may
be achievable with process calibration.
Repeatability
±0.1% to 0.3% of reading
Range (Bidirectional)
–40 ft/s to 40 ft/s (–12.2 m/s to 12.2 m/s)
Rangeability (Overall)
400:1
Specifications assume a fully developed flow profile
(typically 10 diameters upstream and 5 diameters
downstream of straight pipe run) and flow velocity greater
than 1 ft/s (0.3 m/s).
Measurement Parameters
Volumetric flow, totalized flow and flow velocity
Operation and Performance
Flow Measurement
Patented Correlation Transit-Time mode
Enclosure
Epoxy-coated aluminum weatherproof Type 4X/IP67
Dimensions (h x w x d)
8.8 in x 8.2 in x 3.6 in (220 mm x 210 mm x 90 mm)
Weight
3.9 lb (1.77 kg)
Display
128 x 64 pixel LCD graphic display
Keypad
Six button external keypad
Power Supply
15 to 30 VDC loop power
Power Consumption
700 mW maximum
Memory
FLASH memory; field upgradable
Operating Temperature
–4°F to 140°F (–20°C to 60°C)
Storage Temperature
–4°F to 158°F (–20°C to 70°C)
Standard Inputs/Output
One 4 to 20 mA on power loop
Recommended Safety Barrier
28 VDC, 300 S, 93 mA for 4 to 20 mA
Digital Interface
RS232
European Compliance
System complies with EMC Directive 89/336/EEC
Electronics
GE
Sensing
ISX878
Specifications
Clamp-On Flow Ultrasonic Transducers
Temperature Range
–40°F to 194°F (–40°C to 90°C)
Mounting
Stainless steel strap
Certifications
Intrinsically safe
II 1 G EEx ia IIC T4
Transducer Cable
Integral transducer cable up to 100 ft (33 m) with
transducers
Upstream
transducer
Downstream
transducer
15 to 30
VDC
power
supply
Data
acquisition
system
Schematic of loop-power, intrinsically safe installation
Hazardous
Area
Safe Area
Safety barrier (customer supplied)
g
©2004 GE. All rights reserved.
920-135A
All specifications are subject to change for product improvement without notice.
DigitalFlow™ and Correlation Transit-Time™ are trademarks of GE. GE®is a registered
trademark of General Electric Co. 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.
www.gesensing.com
Loading...