Toshiba LF232'F User Manual

Electromagnetic Flowmeter for

Introduction

The LF502 electromagnetic 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 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 obstruction less LF502 flowmeter does not usually allow mud, sands and other solid sediment stay at the bottom of the detector pipe

is unaffected by wave or floating solids on the fluid

and surface. The AF900 hand-held terminal (HART* communicator) can be used to communicate with the flowmeter from a remote place.

*1: HART protocol (Highway Addressable Remote

Transducer) is a communication protocol for industrial sensors recommended by the HCF Communication Foundation).

Signal cable

Detector

Excitation cable

Partially-filled Pipes

eliminates unnecessary piping work

(HART

Converter

Power supply

4-20 mAdc

LF502/LF232*F

6” to 24”

(150 to 600 mm )

LF502

Figure 2. LF502 Electromagnetic Flowmeter

for Partially-filled Pipes

LF232*F

Specifications

■

Overall Specifications

Measurement range:

Meter size Measurement range

6” (150mm)

8” (200mm )

10” (250mm )

12” (300mm )

14” (350mm )

16” (400mm )

20” (500mm )

24” (600mm )

Note: Above flow rate is almost 0 – 3.28 ft/s (std) to 0 –

16.4 ft/s (0 – 1 m/s to 0 – 5 m/s ) flow velocity.

0 – 264 GPM(std) to 0 – 1320 GPM

(0 – 60 m3/h to 0 – 300 m3/h )

0 – 484 GPM(std) to 0 – 2420 GPM

(0 – 110 m

0 – 770 GPM(std) to 0 – 3850 GPM

(0 – 175 m

0 – 1100 GPM(std) to 0 – 5500 GPM

(0 – 250 m3/h to 0 – 1250 m3/h )

0 – 1540 GPM(std) to 0 – 7700 GPM

(0 – 350 m3/h to 0 – 1750 m3/h )

0 – 1980 GPM(std) to 0 – 9900 GPM

(0 – 450 m

0 – 3124 GPM(std) to 0 – 15620 GPM

(0 – 710 m3/h to 0 – 3550 m3/h )

0 – 4400 GPM(std) to 0 – 22000 GPM

(0 – 1000 m

/h to 0 – 550 m3/h )

/h to 0 – 875 m3/h )

/h to 0 – 2250 m3/h )

/h to 0 – 5000 m3/h )

Digital I/O

Figure 1. LF502/LF232*F Configuration

Fluid-level range:

Meter size Specification

6” to 12” m

(150 to 300m )

14” to 24”

(350 to 600mm )

Note: The fully-filled condition means a 100% of inside

tube diameter.

1-1/4”(30mm ) to fully-filled condition.

10% of inside tube diameter to fully-filled condition.

Accuracy: ±2% FS (when measurement range is

standard)

Note: The accuracy is measured under standard

operating facility.

conditions at Toshiba's calibration

TIC-LF502A

Required straight pipe length:

10D minimum on upstream side and

5D minimum on downstream side

Note: D is a nominal meter size.

Fluid conductivity: 100µS/cm minimum

Fluid temperature: 32 to 131 °F (0 to 55 °C )

Ambient temperature: 14 to 122 °F (-10 to 50 °C )

Dimensions and Weights: See figures 3 to 5.

Power supply:

100 to 120 Vac (80 to 132 Vac), 50/60Hz

Power consumption: 50VA (30W) or less

■

Model LF502 Detector

Meter sizes: 6” (150 mm ), 8” (200 mm ), 10” (250

mm ), 12” (300 mm ), 14” (350 mm ), 16” (400 mm ), 20” (500 mm ), 24”(600 mm )

Fluid pressure:

0 psi or 0 bar (0 MPa) to the pressure limited by flange standard

(fully-filled condition)

Connection flange standards:

ANSI 150, JIS 10K

Structure:

IP67 and NEMA 4X Watertight (std. ) IP68 and NEMA 6P Submersible (opt.)

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)

Principal materials:

Case — carbon steel Measuring pipe — 304 stainless steel Linings — The following are the standards:

Meter size Standard specification

6” to 16” (150 to 400mm ) EPDM rubber

20” & 24” (500 & 600mm ) Chloroprene rubber

Electrodes — 316L stainless steel (std.) Grounding rings — The following are the

standards.

Meter size Standard specification

6” to 16” (150 to 400mm ) 316 stainless steel

20” & 24” (500 & 600mm ) 304 stainless steel

See Table 1 for optional materials and other related information.

Coating: phthalic acid resin coating (std.), Pearl-gray colored

Cable connection port:

Cable glands: Provided as standard, R(PT) 1/2

male screw.

Applicable diameter: 0.433 to 0.512 inch (11

to 13mm )

■

Model LF232*F converter

Input signals

Analog signal — the voltage signal from detector,

proportional to process flow rate.

Digital input DI (opt.) (added when 9

digit of specification code is ”3”)

Voltage level: High level 20 to 30 V dc

Low level 2 V dc or less Input resistance: 2.7 kΩ Number of inputs: 2 points (DI1 and DI2)

DI functions:

For digital input function, either of the following functions can be selected.

• Range switching One Digital Input is used: switching between large

and small ranges of forward/reverse, 2-range measurement.

Two Digital Inputs are used: switching between ranges of single direction, 4-range measurement.

• Totalizer control input

Totalizer Start/Stop control or Reset/Start

•Output hold input

Fixed with set value for current output and pulse output (loop check)

• Zero adjustment Starts zero adjustment (on-stream at zero flow rate)

when DI voltage level goes low after remaining high for 10 to 20 seconds.

Output signals

Current output:

4–20mAdc (load resistance 0 to 1KΩ)

Digital output (DO) — One point (std.) and three

more point is optionally available as follows.

Digital output DO1 (std.):

Output type: Transistor open collector Number of outputs: One point Output capacity : 30Vdc, 200mA maximum

Digital output DO2～DO4 (opt.)

(Added when 9

digit of specification code is “3”)

Out put type: Solidstate relay output (non polarity) Number of outputs: 3 points Output capacity: 150Vdc, 150mA maximum or

150Vac (peak to peak), 100mA maximum

DO functions—Four digital output function, either of the following functions can be selected.

• Totalizer pulse output

DO1 or DO2 can be selected (Forward direction pulse and reverse direction pulse can be assigned

TIC-LF502A

independently)

In the case of DO1

Pulse rate: 3.6 to 3,600,000 pulses/h

Pulse width:Settable within the range of 0.3 to

500ms

In the case of DO2

Pulse rate: 3.6 to 360,000 pulses/h

Pulse width: Settable within the range of 4 to

500ms

• Rage switching output One Digital Output (DO) is used

･Single direction, 2-range switching signal ･Forward/reverse direction switching signal

Two Digital Outputs (DO) are used

･Single direction, 4-range switching signals ･Forward/reverse 2-range switching signals

• High/low limit alarm output

An alarm is output when flow rate goes above or

below the set-point value

Setting range : -10 to 110% of the settable

maximum range

High limit 2 points, low limit 2 points can be set At the time of alarm output, Normally Open or Normally Closed contact can be selected

• Preset point output

Contact ON when totalizer count exceeds the set value

Setting range: 1 to 99999999 count

• Converter error alarm

An alarm is output when an operation error is detected by self-diagnosis. At the time of alarm output, Normally Open or Normally Closed contact can be selected

Communications signal:

A digital communications (HART protocol) signal is superimposed on 4 to 20 mA dc analog output signal.

Load resistance: 240 Ω to 1 kΩ Load capacitance: 0.25 µF or less Load inductance: 4mH or less

(For maximum cable length, about 2km is a guideline length when CVV-S 1.25mm

is used

under standard installation condition.)

Note: HART (Highway Addressable Remote

Trans-ducer) is a communications protocol for industrial sensors recommended by the HCF (HART Commu-nication Foundation).

Output display:

16-character×2-line dot-matrix LCD (With back light).

2 units can be selected from the flowing units: flow velocity, instantaneous flow rate, total flow (forward/reverse/difference flow), total count, %, custom unit.

Parameter settings—Parameters can be set asfollows

•IR Switches: Various parameters can be set without opening the converter housing using 4 infrared switches (password can be set)

•Zero adjustment: Zero point adjustment can be started by pressing the switch in the converter.

•Digital communication: The AF 900 hand-held terminal is needed to set parameters.

•Damping: 0.5 to 60 s

(Selectable in one second increments)

“Field re-verification”

Mag-Prover – Toshiba’s

Zero span calibration tool allows unit to be re-calibrated and verified using an internal software program. (For more information contact Toshiba International Corp.)

Conditions when power fails:

Parameter setting values are stored in non-volatile memory and the values will be restored when the power returns to normal condition The output and display will stay as follows when power fails..

Current output: 0 mA Digital output : OFF (contact open)

LCD display : No display

Surge protection: Surge protectors are installed in the

power supply, excitation circuit, current signal output and digital I/O circuit.

Terminal block structure:21-pole, screw connection

type (M4 screw)

Housing: Aluminum alloy Coating: Acrylic resin-baked coating, pearl-gray

colored

Cable connection ports :

A cable gland is provided for each port.

OD of cable φ11 to 13 mm Material Nylon 66 G(PF) 1/2 male screws.

Structure: IP67 and NEMA 4X Watertight Vibration resistance:

No resonance to the following levels of vibration:

• 10 to 55Hz with amplitude of 0.07mm,

• Vibration of 30Hz with 29.4 m/s

in 4h in each

direction will not cause any defect to unit.

Note:

Avoid using the flowmeter in an environment

with constant vibration.

Dimension and Weights:

See Figure 5

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