Toshiba LF502 user guide
F-IN -D Series
Electromagnetic Flowmeter for
Partially-filled Pipes
Introduction
The LF502 electr oma gnetic flowmeter uses Faraday’s
Law of electromagnetic induction in the same way as
conventional electromagnetic flowmeters to measure
the flow rate. Position of electrodes in the LF502 is so
designed that it can be used even in a partially-filled
pipe to measure the flow rate.
Improved functional magnetic field distribution technique enables a high-precision flow measurement continually from low-level to fully-filled flow conditions.
This
eliminates unnecessary piping work such as lifting
the downstream pipe section to fill the detector pipe.
Compared with flowmeters measuring the flow rate by
means of flow level, the obstructionless LF502 flowmeter does not usually allow mud, sands and other
solid sediment stay at the bottom of the detector pipe
is
and
unaffected by wave or floating solids on the fluid
surface.
The
AF100 hand-held terminal or the Model 275 HART
communicator can be used to communicate with the
flowmeter
munications protocol. See the communications output
specifications for details about the HART protocol.
from remote places using the HART com-
Converter
Detector
Signal cable
Excitation
cable
Power supply
4-20 mA dc
Digital I/O
LF502
150
to
(
”
to
6
Fi gu r e 2. LF502 El ec t r o m ag n et i c F l owme t e r
for Partially-filled Pip es
Fluid-level range:
x
30 mm (1 1/4”) to fully-filled condition for Meter
sizes 150 mm (6”) to 300 mm (12”)
of
x
10%
inside tube diameter to fully-filled condition
for Meter sizes 350 mm (14”) to 600 mm(24”)
Accuracy:
±2 % FS (when measurement range is
standard)
The accuracy is measured under standard
Note:
operating
conditions at Toshiba's calibration facility.
Required straight pipe length:
minimum on upstream side and
10D
5D minimum on downstream side
D is a nominal meter size.
Note:
Fluid conductivity:
Fluid temperature:
Ambient temperature:
100µS/cm minimum
0 to 55 °C (32 to 131 °F)
–10 to 50 °C (14 to 122 °F)
600
24
mm
)
”
Figure 1. LF502 Configuration
Specifications
„
Overall Specifications
Measurement range:
Meter size
in mm (inch)
150 mm (6”)
200 mm (8”)
250 mm (10”)
300 mm (12”)
350 mm (14”)
400 mm (16”)
500 mm (20”)
600 mm (24”)
Measurement range
0 –
60 m3/h (std) to 0 – 300m3/h
0 – 110 m
0 – 175 m
0 – 250 m
0 – 350 m
0 – 450 m
0 – 710 m
0 –1000 m
3
3
3
3
3
3
/h (std) to 0 – 550m3/h
/h (std) to 0 – 875m3/h
/h (std) to 0 –1250m3/h
/h (std) to 0 –1750m3/h
/h (std) to 0 –2250m3/h
/h (std) to 0 –3550m3/h
3
/h (std) to 0 –5000m3/h
„
Detector Specifications
Meter sizes:
150 mm (6”), 200 mm (8”), 250 mm
(10”), 300 mm (12”), 350 mm (14”), 400 mm
(16”), 500 mm (20”), and 600 mm (24”)
0
Fluid pressure:
to 2.0 MPa under fully-filled fluid
condition for flange-connected flowmeters
Connection flange standards:
ANSI 150, BS 16,
DIN PN16 and others.
Structure:
NEMA 4 (IP 67) Watertight (standard),
NEMA 6 (IP 68) Submersible (option)
Coating:
Phthalic acid resin coating, pearl-gray colored
(standard for watertight type) or black tar epoxy
(option for watertight type and specified
exclusively for submersible type)
EJL- 064A
LF502
2
Principal materials:
— carbon steel
Case
Linings
— The following are the standards:
Teflon PFA for Meter sizes 150 mm (6”) to 400
mm (16”), chloroprene rubber for Meter sizes
500 mm (20”) and 600 mm(24”)
Electrodes
Grounding rings
See Table 1 for optional materials and other
— 316L stainless steel (standard)
— 316 stainless steel (standard)
related information.
„
Converter Specifications
Input signals
Analog input:
voltage signal from detector and is
proportional to process flow rate
Digital input (DI)
Voltage signal: High level 20 to 30 V
Low level 2 V
Input resistance: 2.7 k:
Number of inputs: one point
DI function
— One of the following functions can
be assigned to DI signal:
• Unidirectional 2-range switching signal
(lower range with high DI voltage level)
• Bidirectional 2-range switching signal
(lower range with high DI voltage level)
• Totalizer start/stop
— Starts and stops the
built-in totalizer. (Totalizer starts with high DI
voltage level and stops with low DI voltage
level.)
• Zero adjustment
— Starts zero adjustment (on-
stream at zero flow rate) when DI voltage level
low after remaining high for 10 to 20 seconds.
goes
• Fixed-value outputs
— Outputs fixed values
for current output (and pulse output if used).
Outputs fixed values when DI voltage is high.
Output signals
Analog output:
4–20 mA
dc;
Load resistance 0 to 1 k:
Digital outputs:
— 2 points (D1 and D2)
Output type: Solidstate relay contact outputs
(non polarity)
Capacity: 150 V
150 V
dc, 150 mA maximum or
ac, 100 mA maximum (peak)
Number of outputs: Two points
D1 and D2 functions
— Two of the following
functions can be assigned to D1 and D2.
•
Pulse output (available only for D1)
Pulse rate: 3.6 to 360000 pulses/hour
Pulse width: 5 to 100 ms (but less than half of
the period for 100 % flow rate)
• Multi-range selection outputs
(1) One point (D1 or D2) output
Unidirectional 2-range automatic selection
signal or bidirectional 2-range automatic
selection signal
dc or less
dc
(2) Two point (D1 and D2) outputs
Unidirectional 4-range automatic selection
signal or bidirectional 4-range automatic
selection signal
•
High and/or low limit alarm outputs
Outputs an alarm signal if the flow rate output
goes above high limit value or below low limit
value
Setting range: –10 to 110 % of range
Output
•
Empty pipe alarm output
status: Contact ON when alarm occurs.
Outputs an alarm signal if the detector pipe is
emptied.
Output
•
Preset point output
status: Contact ON when alarm occurs
Outputs a signal when the built-in totalizer
count reaches the preset point.
Setting range: 1 to 999999 counts
Output
•
Converter failure alarm output
status: Contact ON when alarm occurs
Outputs an alarm signal if the converter detects
an erroneous condition other than high/low
limit or empty pipe alarm conditions.
Communications output
superimposed on 4–20 mA
— A digital signal is
dc current signal
(conforms to the HART protocol).
1
Load resistance: 240 : to
k:
Load capacitance: 0.22 µF maximum
HART (Highway Addressable Remote
Note:
Transducer) protocol is a communications
protocol for industrial sensors recommended by
HCF (HART Communication Foundation).
Output display:
2-line,16-character LCD display
(backlit) shows flow rate and total flow in various
engineering units. Up to two set of data can be
displayed.
Damping:
Parameter settings:
5 to 600 s
Configuration parameters can
be set using the control keys on the LCD display.
Zero and span calibration:
Built-in calibration signal source allows converter
unit check.
Zero adjustment:
Zero point adjustment can be
started by pressing a combination of control keys
on the LCD display.
Conditions when power fails:
The output and display will remain as follows
when power fails. Parameter setting values are
stored in non-volatile memory and the values will
be re-stored
when the power returns to normal
condition.
• Current output: 0 mA
dc
• LCD display: No display
Digital output: OFF
•
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