TOSHIBA LF494 /LF620 Sanitary Electromagnetic Flowmeter Owner’s Manual

TOSHIBA LF494 /LF620 Sanitary Electromagnetic Flowmeter

Specifications

• Measurement range in terms of flow velocity: 1.0 ft/s to 32.8
  ft/s (0.3 m/s to 10 m/s).

• Optional range: 0.3 ft/s to 1.0 ft/s (0.1 m/s to 0.3 m/s).

• Structure: IP 67 and NEMA 4X Watertight

• Power consumption:

  • AC100-240: MAX12W(27VA)
  • DC24: MAX16W

• With communication function

• Approved hazardous location certifications for models
  LF494/LF620F and LF494/LF622F

• Mount-Anywhere Technology for immunity to upstream flow disturbances

Product Usage Instructions

Detection and Conversion Types
The product comes in two types: Combined and Separate types. The LF490/LF620 and LF494/LF620F are Combined types, while LF490/LF622 and LF494/LF622F are Separate types.

Mounting Requirements
Ensure a minimum of 1D length of upstream straight pipe from the flange to maintain performance specification due to the unique magnetic field distribution technology.

Model LF490 and LF494 Detectors
These detectors have a sanitary clamp type connection method (ISO 2852) with stainless steel case, Teflon PFA linings, and 316L stainless steel electrodes.

FAQ
Q: What is the measurement range of flow velocity for this product?
A: The measurement range is from 1.0 ft/s to 32.8 ft/s (0.3 m/s to 10 m/s) with an optional range of 0.3 ft/s to 1.0 ft/s (0.1 m/s to 0.3 m/s).

Field Intelligent Device – Mount-Anywhere Series
Sanitary Electromagnetic Flowmeter

Introduction

Sanitary electromagnetic flowmeters LF490 series are designed for applications handling food and beverages. Sanitary flowmeters must be structured in such a way that operation and handling are simple, easy, and thorough for the purpose of sanitary control such as cleaning (CIP/SIP), sterilization, and drying. The sanitary flowmeter has features provided with normal electromagnetic flowmeters and by using sanitary fittings for pipeline connections fluid does not remain in any place along the detector pipeline. Therefore, it is fit for flow rate measurement for food and beverages.
The electromagnetic flowmeter uses Faraday’s Law of electromagnetic induction to measure the process flow. The device consists of two units: a detector, through which the fluid to be measured flows and in which low-level signals proportional to flow rates are obtained; and a converter, which supplies excitation current to the detector, and amplifies the signals from the detector and then processes and converts the signals into the 4–20mAdc current signal or communication signal*1&2. The meter features a Mount-Anywhere magnetic field distribution technology, the meter is highly immune to upstream flow disturbances. Combined with a multi-functional converter LF620 (combined type) or LF622 (separate type) equipped with its patented Noise-Sentry original noise-suppression circuit and advanced algorithms. The LF490 has a very high tolerance to noise, giving the unit a very stable output even for slurry fluid measurement. IR (Infrared) switches enable parameter setting of the converter without removing the cover. Flow direction can be set in either way and its unique 128 x 128 dot matrix LCD display allows the LCD to be rotated electronically to 90, 180 and 270 degrees without opening the cover. The terminal block on LCD side makes it easy to wire in case of the combined type.

Cable gland openings have only dust caps which are not water tight. Water tight status is not met until properly wired and connected.

1. HART protocol (Highway Addressable Remote
   Transducer) is a communication protocol for industrial sensors recommended by the HCF (HART Communication Foundation).
   ** DevComm2000 Smart Device Communicator available for performing HART device configurations on PC or laptop is available through the supplier.

2. Modbus is the communication protocol that Modicon Inc. developed. Physical layer is RS485.

Specifications

Overall Specifications
Measurement range in terms of flow velocity:

• 1.0 ft/s to 32.8 ft/s (0.3 m/s to 10 m/s).
• 0.3 ft/s to 1.0 ft/s (0.1 m/s to 0.3 m/s) range is available optionally.
• Accuracy: ±0.2 % of Rate*
• This pulse output error result is established under standard operating conditions at Toshiba’s flow calibration facility, Fuchu Japan. (NIST Traceable).
• Individual meter measurement error may vary up to ±0.5% of Rate at 1.64 ft/s (0.5m/s) or more and ±0.3% of rate ±0.039 inch/s (1mm/s) at 1.64ft/s (0.5 m/s) or less.
• Current output: plus ± 8μA (0.05% of span.)
• *Refer to individual calibration data for each individual meter’s measurement error.
• Fluid conductivity 5µS/cm minimum
• Fluid temperature: 14 to 248 F (–10 to +120 C)
• Ambient temperature: – 4 to 140 F (–20 to +60 C)
• Structure: IP 67 and NEMA 4X Watertight

Power consumption

• AC100-240:MAX12W(27VA)
• DC24: MAX16W

With communication function

• 3A standard (LF490 and LF494 detectors):
• Approved for 3A standard with FDA-approved Teflon PFA lining.
• Approved hazardous location certifications:
• Model: LF494/LF620F and LF494/LF622F
• cFMus Nonincendive for use in
• hazardous (classified) locations: Class I, II, III, Division 2, Groups A-G

Detector and converter combination

• LF490/LF620: Combined type for standard specification.
• LF490/LF622: Separate type for standard specification.
• LF494/LF620F: Combined type with Ex approval of Class I, Division 2 (cFMus).
• LF494/LF622F: Separate type with Ex approval of Class I, Division 2 (cFMus).

Mount-Anywhere Technology

• Thanks to TOSHIBA’s unique magnetic field distribution technology, the meter is highly immune to upstream flow disturbances.
• A minimum of 1D (one diameter) length of upstream straight pipe from the flange is required to maintain the performance specification.
• Note: The test results were obtained and demonstrated at TOSHIBA’s flow calibration facility, Fuchu Japan.

Model LF490 and LF494 Detectors

• Fluid pressure: –15 to 300 psi, or –1.0 to 20 bar (–0.1 to 2.0 MPa)
• Note: This pressure is the allowable pressure for the detector. The actual pressure will be restricted by the type of connection method. For example, in the case of sanitary clamp type, the maximum pressure is 150 psi or 10 bar(1.0 MPa).
• Note: The test pressure before shipping from the factory is equal to twice the nominal pressure rating of the customer-specified flange connection during 5 minutes.

Connection method

• Sanitary clamp type (ISO 2852)

Note

• Tri-clamp® can connect except meter size 4″ (100 mm).
• Tri-clamp® is a registered trademark for Tri-Clover Inc.
• Principal materials:
• Case — stainless steel
• Linings — Teflon PFA (FDA approved)
• Note: Teflon liners are mechanically retained for full vacuum service.
• Electrodes — 316L stainless steel (std.)
• Note: Electrodes are electro-chemically polished after mechanically buffed.
• Sanitary fittings — 304 stainless steel (std.)
• Seal gaskets — Silicon rubber (FDA approved)
• Note: See Table 4 for optional materials and other related information.
• Measuring tube material — 304 stainless steel
• Coating: no coating (std.)
• Dimensions and weights: See Figures 3 to 6.
• Cable connection port: for separate type detectors.
• Cable glands —
• LF490: Provided as standard, R(PT) 1/2 male threads.
• LF494Pot provided, 1/2–14NPT male threads are required.
• Applicable diameter —
• 0.433 to 0.512 inch (11 to 13mm)

Model LF620 and LF622 converters

Input signals

• Analog signal — the voltage signal from detector, proportional to process flow rate (for LF622 separate type converter).
• Digital input DI (opt.)
• Signal type: 20 to 30Vdc voltage signal Input resistance: 10k Number of inputs: one point
• DI function — One of the following functions can be assigned to the optional DI signal.
• Range switching — Selects either the higher or lower range in the unidirectional or bidirectional 2-range setting.
• Totalizer control — Starts and stops the built-in totalizer.
• Fixed-value outputs —Outputs fixed-values for current and pulse outputs.
• Zero adjustment — Executes zero adjustment (on-stream at zero flow rate).

Output signals

• Current output: 4–20mAdc (load resistance 0 to 750)
• Digital outputs — Two points are available as follows.
• Digital output DO1: Output type: Transistor open collector Number of outputs: One point Output capacity: 30Vdc, 200mA maximum
• Note: DO1 cannot be used if Modbus communication connection is 3 lines. (Refer table 6 for details)
• Digital output DO2: Output type: Solid-state relay output (non-polarity) Number of outputs: One point Output capacity: 150Vdc, 150mA maximum or 150Vac (peak to peak), 100mA maximum
• Note: DO2 cannot be used with the Modbus communication.(Refer table 6 for details)
• DO1 and DO2 functions — One of the following functions can be assigned to DO1and/or DO2.
• Pulse output (available only for DO1,DO2) Pulse rate: Max 10kHz (10,000pps) (DO1)
• Max 100Hz (100pps) (DO2) (Over 1kpps, auto-setting) Pulse width: 0.5 to 500ms (but less than half of the period for 100% flow rate)
• Note: The same and simultaneous pulse is not available between DO1 and DO2.)
• Multi-range selection outputs (Note 1)
• High, High high, Low, and/or Low low alarm outputs (Note 2)
• Empty pipe alarm output
• Digital Output Active Status (DO1 and DO2) (Note 2)
• Preset count output
• Converter failure alarm output

1. Note 1: Two outputs (DO1 and DO2) are needed for 4-range switching and forward/reverse 2-range switching.
2. Note 2: Normal Open (default set) or Normal Close is selected for alarm outputs when programming. When power failure occurs, unit will be fault to Normal Open. Communications output:

• HART (std.) — Digital signal is superimposed on 4–20mAdc current signal as follows:

Conforms to HART protocol

• Load resistance: 240 to 750 Load capacitance: 0.25μF maximum Load inductance: 4mH maximum

MODBUS (opt.)

• Physical layer : RS485
• Protocol : Modbus
• Mode : RTU
• Baudrate : 4800, 9600, 19200bps
• Data length : 8bit
• Parity bit : None, Odd, Even
• Stop bit : 1bit, 2bit
• Error check : CRC-16
• Max. station number : 32(with Master device)
• Max. cable length : 1.2km (Note)
• Note: This length is specification of 3 line connection.
• LCD display: Full dot-matrix 128×128 dot LCD display (back-light provided)
• A parameter change will rotate the display.

Parameter settings — Parameters can be set as follows:

• IR Switches: Three key switches are provided to set configuration parameters.
• Digital communication: HART or Modbus is needed to set parameters.
• Zero adjustment: Zero point adjustment can be started by pressing the switch in the converter.
• Damping: 0.5, 1 to 60 seconds (selectable in 1 second increments)
  “Field re-verification” Mag-Prover – Toshiba’s Zero span calibration tool allows the 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 outputs and display will remain as follows when power fails.

• Current output: 0mAdc
• Digital output: OFF
• LCD display: No display

Power supply
One of the following can be selected:

• 100 to 240Vac, 50/60Hz (allowable voltage 80 to 264Vac) 110Vdc (allowable voltage 90 to 130Vdc)
• 24Vdc (allowable voltage 18 to 36Vdc)

Surge protection

• Arresters are installed in the power supply, and a current signal output circuit to help protect the meter from lightning and improve personnel safety.
• Case: Aluminum alloy (equal to IP 67)
• Coating: Acrylic resin-baked coating, pearl-gray colored

Cable connection ports

• Cable glands —

LF620 and LF622 without cFMus Approval

• Provided as standard, OD of cableφ11~13mm Material Nylon 66 G (PF) 1/2 male threads.

LF620F and LF622F with cFMus Approval

• Not provided, (Supplied by Customer) 1/2–14NPT male threads are required.
• Applicable diameter —
• 0.433 to 0.512 inch (11 to 13mm)

Vibration resistance:
No resonance to the following levels of vibration:

• 10 to 150Hz with acceleration of 9.8m/s2
• Vibration of 30Hz with 29.4 m/s2 in 4h in each direction will not cause any defect to unit.
  Note: Avoid using the flowmeter in an environment with constant vibration.
  Dimensions and Weights: See Figure 8 (for Separate type)

MTBF
Converter: 220,000 hours (25 years) at 77 °F (25 °C) based on strict military specification MIL-HDBK-217F
Detector: 350,000 hours (40 years) at 77 °F (25 °C) based on strict military specification MIL-HDBK-217F

Installation

Dimensions (Combined type)

1. Note1: Clamp (Joint) size is different from meter size of LF490 and LF494. See the following table.
2. Note2: Cable glands are not provided for cFMus approved  type.

For English unit

Meter size (inch)| Joint size (ISO2852)| L1

(inch)

| L2

(inch)

| D1

(inch)

| Weight (lbs)
---|---|---|---|---|---
1 (1S)| 2 S| 4.33| 9.31| 2.87| Approx. 9
1-1/2 (1-1/2S)| 2 1/2 S| 4.92| 9.98| 3.54| Approx. 11
2 (2S)| 3 S| 5.51| 10.53| 4.09| Approx. 14
3 (3S)| 4 S| 5.51| 11.56| 5.12| Approx. 18
4 (4S)| 5 1/2 S| 6.30| 12.82| 6.38| Approx. 25

For SI unit

Meter size mm (inch)| Joint size (ISO2852)| L1

(mm)

| L2

(mm)

| D1

(mm)

| Weight (kg)
---|---|---|---|---|---
25 (1S)| 2 S| 110| 236.5| 73| Approx. 4
40 (1 1/2S)| 2 1/2 S| 125| 253.5| 90| Approx. 5
50 (2S)| 3 S| 140| 267.5| 104| Approx. 6
80 (3S)| 4 S| 140| 293.5| 130| Approx. 8
100 (4S)| 5 1/2 S| 160| 325.5| 162| Approx. 11

• Note3: Tri-clamp® is available to use the same joint size instead of ISO2852 clamp except meter size 4″ (100 mm).
• Note4: 1 inch = 25.4 mm

Figure 3. LF490/LF620 and LF494/LF620F Flowmeters (Ferrules and Clamps not attached)

Welding connection Unit: inch (mm

1. Note1: L1 dimension is for the standard (Normal length) type ferrule.
2. Note2: See Figure 7 for Ferrule dimensions.
3. Note3: Cable glands are not provided for cFMus approved type.
4. Note4: Tri-clamp® is available to use the same joint size instead of ISO2852 clamp except meter size 4″ (100 mm).
5. Note5: 1 inch = 25.4 mm

For English un

Meter size (inch)| Joint size (ISO2852)| L1

(inch)

| D1

(inch)

| D2

(inch)

| Weight (lbs)
---|---|---|---|---|---
1| 2 S| 6.16| 1.00| 3.11| Approx. 13.2
1-1/2| 2 1/2 S| 6.75| 1.50| 3.66| Approx. 17.6
2| 3 S| 7.34| 2.00| 4.17| Approx. 19.8
3| 4 S| 7.85| 3.00| 5.28| Approx. 26.5
4| 5 1/2 S| 8.64| 4.00| 6.81| Approx. 35.3

For SI unit

Meter size

mm (inch)

| Joint size

(ISO2852)

| L1

(mm)

| D1

(mm)

| D2

(mm)

| Weight

(kg)

---|---|---|---|---|---
25| 2 S| 156.4| 25.4| 79| Approx. 6
40| 2 1/2 S| 171.4| 38.1| 93| Approx. 8
50| 3 S| 186.4| 50.8| 106| Approx. 9
80| 4 S| 199.4| 76.3| 134| Approx. 12
100| 5 1/2 S| 219.4| 101.6| 173| Approx. 16

Figure 4. LF490/LF620 and LF494/LF620F Flowmeters (Ferrules and Clamps attached)

Dimensions (Separate type)

1. Note1: Clamp (Joint) size is different from meter size of LF490. See the following table.
2. Note2: Cable glands are not provided for cFMus approved type.
3. Note3: Tri-clamp® is available to use the same joint size instead of ISO2852 clamp except meter size 4″ (100 mm).
4. Note4: 1 inch = 25.4 mm

For English unit

Meter size (inch)| Joint size (ISO2852)| L1

(inch)

| L2

(inch)

| D1

(inch)

| Weight (lbs)
---|---|---|---|---|---
1| 2 S| 4.33| 7.05| 2.87| approx. 8.8
1-1/2| 2 1/2 S| 4.92| 7.72| 3.54| approx. 11.0
2| 3 S| 5.51| 8.27| 4.09| approx. 13.2
3| 4 S| 5.51| 9.29| 5.12| approx. 17.6
4| 5 1/2 S| 6.30| 10.55| 6.38| approx. 24.3

For SI unit

Meter size

(mm)

| Joint size

(ISO2852)

| L1

(mm)

| L2

(mm)

| D1

(mm)

| Weight

(kg)

---|---|---|---|---|---
25| 2 S| 110| 179| 73| approx. 4
40| 2 1/2 S| 125| 196| 90| approx. 5
50| 3 S| 140| 210| 104| approx. 6
80| 4 S| 140| 236| 130| approx. 8
100| 5 1/2 S| 160| 268| 162| approx. 11

Figure 5. LF490/LF622 and LF494/LF622F Flowmeters (Ferrules and Clamps not attached)

Welding connection Unit: inch (mm)

1. Note1: L1 dimension is for the standard (Normal length) type  ferrule.
2. Note2: See Figure 7 for Ferrule dimensions.
3. Note3: Cable glands are not provided for cFMus approved type.
4. Note4: Tri-clamp® is available to use the same joint size instead of ISO2852 clamp except meter size 4″ (100 mm).
5. Note5: 1 inch = 25.4 mm

Meter size

(inch)

| Joint size

(ISO2852)

| L1

(inch)

| D1

(inch)

| D2

(inch)

| Weight

(lbs)

---|---|---|---|---|---
1| 2 S| 6.16| 1.00| 3.11| approx. 11.0
1-1/2| 2 1/2 S| 6.75| 1.50| 3.66| approx. 15.4
2| 3 S| 7.34| 2.00| 4.17| approx. 17.6
3| 4 S| 7.85| 3.00| 5.28| approx. 24.3
4| 5 1/2 S| 8.64| 4.00| 6.81| approx. 33.1
Meter size mm (inch)| Joint size (ISO2852)| L1

(mm)

| D1

(mm)

| D2

(mm)

| Weight (kg)
---|---|---|---|---|---
25| 2 S| 156.4| 25.4| 79| approx. 5
40| 2 1/2 S| 171.4| 38.1| 93| approx. 7
50| 3 S| 186.4| 50.8| 106| approx. 8
80| 4 S| 199.4| 76.3| 134| approx. 11.
100| 5 1/2 S| 219.4| 101.6| 173| approx. 15

Figure 6. LF490/LF622 and LF494/LF622F Flowmeters (Ferrules and Clamps attached)

Normal type For English unit

Meter size (inch)| Joint size (ISO2852)| L1

(inch)

| L2

(inch)

| D1

(inch)

| D2

(inch)

| D3

(inch)

| Weight (lbs)
---|---|---|---|---|---|---|---
1 (1S)| 2 S| 0.85| 0.11| 2.52| 0.91| 1.00| Approx.0.4
1-1/2 (1-1/2S)| 2 1/2 S| 0.85| 0.11| 3.05| 1.41| 1.50| Approx. 0.4
2 (2S)| 3 S| 0.85| 0.11| 3.58| 1.88| 2.00| Approx. 0.7
3 (3S)| 4 S| 1.10| 0.11| 4.69| 2.85| 3.00| Approx. 1.1
4 (4S)| 5 1/2S| 1.10| 0.22| 6.10| 3.84| 4.00| Approx. 2.2

Normal type For SI unit

Meter size mm (inch)| Joint size (ISO2852)| L1

(mm)

| L2

(mm)

| D1

(mm)

| D2

(mm)

| D3

(mm)

| Weight (kg)
---|---|---|---|---|---|---|---
25 (1S)| 2 S| 21.5| 2.85| 64.0| 23.0| 25.4| Approx. 0.2
40

(1 1/2S)

| 2 1/2 S| 21.5| 2.85| 77.5| 35.7| 38.1| Approx. 0.2
50 (2S)| 3 S| 21.5| 2.85| 91.0| 47.8| 50.8| Approx. 0.3
80 (3S)| 4 S| 28.0| 2.85| 119.0| 72.3| 76.3| Approx. 0.5
100 (4S)| 5 1/2S| 28.0| 5.6| 155.0| 97.6| 101.6| Approx. 1.0

Long type For English unit

Meter size (inch)| Joint size (ISO2852)| L1

(inch)

| L2

(inch)

| D1

(inch)

| D2

(inch)

| D3

(inch)

| Weight (lbs)
---|---|---|---|---|---|---|---
1 (1S)| 2 S| 3.00| 0.11| 2.52| 0.91| 1.00| Approx. 0.4
1-1/2 (1-1/2S)| 2 1/2 S| 3.00| 0.11| 3.05| 1.41| 1.50| Approx. 0.7
2 (2S)| 3 S| 3.00| 0.11| 3.58| 1.88| 2.00| Approx. 0.9
3 (3S)| 4 S| 4.00| 0.11| 4.69| 2.85| 3.00| Approx. 1.8
4 (4S)| 5 1/2S| 4.00| 0.22| 6.10| 3.84| 4.00| Approx. 3.1

Long type For SI unit

Meter size mm (inch)| Joint size (ISO2852)| L1

(mm)

| L2

(mm)

| D1

(mm)

| D2

(mm)

| D3

(mm)

| Weight (kg)
---|---|---|---|---|---|---|---
25 (1S)| 2 S| 76.2| 2.85| 64.0| 23.0| 25.4| Approx. 0.2
40

(1 1/2S)

| 2 1/2 S| 76.2| 2.85| 77.5| 35.7| 38.1| Approx. 0.3
50 (2S)| 3 S| 76.2| 2.85| 91.0| 47.8| 50.8| Approx. 0.4
80 (3S)| 4 S| 101.6| 2.85| 119.0| 72.3| 76.3| Approx. 0.8
100 (4S)| 5 1/2S| 101.6| 5.6| 155.0| 97.6| 101.6| Approx. 1.4

1. Note1: This special Ferrule, which fits on TOSHIBA LF490 and LF494, can be fastened to ISO2852 clamp.
   Tri-clamp® is available to use the same joint size instead of ISO2852 clamp except meter size 4″ (100mm).

2. Note2: “D1” is Toshiba’s original dimension.

3. Note3: 1 inch = 25.4 mm

Figure 7. Ferrule dimensions Note: Cable glands are not provided for LF622F cFMus approved type.
Refer to the Cable connection port at converter.
Note: 1 inch = 25.4 mm

Figure 8. Separate type converter LF622 and LF622F

External Connections

• Combined type LF490/LF620 and LF494/LF620F flowmeters

*1 Locate an external double-pole power switch on the power line near the flowmeter within easy reach of operation.

Use the appropriate switch rating as shown below:
Switch rating: 250Vac, 6A or more

In rush current: 15A or more
Figure 9. Combined type LF490/LF620 and LF494/LF620F flowmeters Wiring Diagram

Separate type LF490/LF622 and LF494/LF622F flowmeters Figure 10. Separate type LF490/LF622 and LF494/LF622F flowmeters wiring Diagram
Table 1. LF620, LF620F, LF622 and LF622F Converters Signal Table

L2 (－)
GND| Ground (for arrester)|
FG| Frame ground|
DI| Digital Input (20～30Vdc)| __

__

__

I/O cable

DO1| Digital Output 1
DO2| Digital Output 2
COM| Signal Common for DI, DO1, DO2
＋| __

Current Output (4～20mAdc)

__

－

|
X| Excitation Output| Exc

itation cable

(for LF622,LF622F only)

Y
E
A| __

Signal Input

| Signal cable

(for LF622,LF622F only)

B
G
T+| Modbus(+)| Twisted-pair polyethylene

insulated vinyl sheath cable (JKEV,AWG24(0.2mm2))

T-| Modbus(-)
TG| Modbus(GND)

Note: Symbol of the terminal is changed as follows for Modbus.
DO2 → T+, DI → T-, COM → TG

Wiring Precautions

1. Explosion proof type flowmeters are not provided cable glands.
   Refer to the part Cable connection port at detector and converter.

2. Connect the grounding wire (IV wire 5.5mm² or more) to a good earth ground (100 or less ground resistance). Make the wire as short as possible. Do not use a common ground shared with other equipment where earth current may flow. An independent earth ground is recommended.

3.  The allowable cable lengths between the detector and converter for the separate type flowmeter depend on the electrical conductivity of the object fluid. See Figure 11.

4. DO1, DO2, and DI use the same common terminal (COM). This COM can not connect to other equipments which have their own ground terminal. (Power supply for connecting to DI or DO, etc…) Need to wire separately.

Wiring Precautions (Modbus)

1. For wiring path, avoid places near electrical equipment that may cause electromagnetic induction or electrostatic induction interference (such as a motor, transformer and wireless transmitter).
2. General cables are designed for indoor use where cables are not exposed to humidity, rain, etc. When you install cables, make sure to check the operating conditions such as the operating temperature range of the cable by contacting its manufacturer.
3. When you carry out cable end treatment, use a dedicated cable stripper etc. so that the core wire of the cable will not be nicked or damaged. In addition, for cables, be careful of allowable maximum bend diameter etc. (Basically, do not install cables in a way cables are twisted or bent.).
4. The electromagnetic flowmeter is not equipped with terminating resistors. Use the terminating resistor unit for Modbus or junction box, if necessary.
5. Only one Modbus cable goes through a cable gland of the Electromagnetic Flowmeter. Please use the junction box at system configuration.
6. Install a terminator to flowmeter that connected to the end of Modbus network.

Meter Size
To select the meter size

See Table 2 to 3 and find meter sizes within the velocity of 0.3 to 32.8 ft/s (0.1 to 10m/s ) for a specified full-scale (measuring range high limit) flow. Select one that has its full-scale velocity between 3.0 and 10 ft/s (1 and 3m/s).

Note: Make sure the full-scale flow rate used for the final planning stage stays within 32.8 ft/s (10m/s) in terms of flow velocity.
Table 2. Flow Rate and Flow Velocity (English unit) Unit: gal/min

Size (inch)

| Flow rate
---|---
0.328

ft/s

| 0.98 ft/s| 3.0 ft/s| 10 ft/s| 32.8

ft/s

1| 0.7781| 2.334| 7.115| 23.72| 77.81
1 ½| 1.992| 5.975| 18.21| 60.71| 199.2
2| 3.112| 9.337| 28.46| 94.86| 311.2
3| 7.967| 23.90| 72.85| 242.8| 796.7
4| 12.45| 37.35| 113.8| 379.4| 1,245

Table 3. Flow Rate and Flow Velocity (SI unit)
Unit: m3/h

• About establishment environment
  Do not store or install the flowmeter :

  • Where there is direct sunlight.
  • Where excessive vibration or mechanical shock occurs.
  • Where high temperature or high humidity conditions exist.
  • Where corrosive atmospheres exist.
  • Places that can be submerged under water.
  • Where there is a sloped floor. To put the flowmeter temporarily on the floor, place it carefully with something, such as a block, to support it so that the flowmeter will not topple over.

In areas like the following, there may be the case that infrared switches do not function correctly. (If these are unavoidable, use an appropriate cover.)\

1. Where unit (operation panel) is exposed to direct sunlight, reflection of light onto window pane and diffused light reflection.
2. Where smoke and steam may occur.
3. Where exposed to direct snow, ice or mud.

Ordering Information

1. When ordering the LF490 series flowmeters, refer to Tables 4 and 5 (Type Specification Codes). An entry must be made for each of the columns in each of these tables.
2. Fluid characteristics:
3. Type of fluid to be measured and its characteristics
4. Fluid temperature
5. Fluid pressure
6. Electrical conductivity of the fluid
7. Measuring range
8. I/O function setting
9. Ordering scope:  Flow calibration data: (required or not)
10. Other items Specifications other than standard items

Consult a Toshiba representative when choosing materials for lining, electrodes, and grounding rings.
T oshiba International Corp. (Houston) stocks Hazardous location certification type flowmeters as standard inventory.

Table 4. Specification Code (Sanitary type detector LF490 Series)

Size code explanation: √ : Object ⚫: Standard : Option –: Not available

1. Note1: Cable glands are not provided. Refer to the part of “Cable connection port” at detector and converter.
2. Note2: Tri-clamp® is available to use the same joint size instead of ISO2852 clamp except meter size 100mm (4″). Note3: Toshiba’s original ferrule is required to use for LF490 series detectors to keep just fitting between the joint in case of choosing clamp type.
3. Note4: Applies to the separate type flowmeter only. Specifying the code C, indicate the length of cable from 1 to 300m in 1 meter increments.
4. Note5: Consult Toshiba before ordering when choose materials at the wetting parts.
5. Note6: LF494 have only 3A approved type.

Code explanation: ⚫: Standard: Option –: Not available

1. Note 1: When Modbus communication is provided, digital output points 1(DO1) and digital output points(DO2), digital input point 1(DI), HART communication cannot be used. Refer Table 6 for more details.
2. Note2: Select 110Vdc for test report inspected under the condition of 110Vdc.

Table
Table6. Communication functions and output selection table

4-20mAdc

| __

DO1

| __

DO2

| __

DI

1| HART| | | |
__

3

| __

Modbus

| |

(Note)

| Ｘ| Ｘ

Code explanation: ✓:Available Ｘ:Not Available
Note: When digital output 1 function and Modbus communication function are used at one time, TG (signal ground) of the
Modbus communication function cannot be connected (2 line connection).

Table 7. Type Specification Code for Maintenance Parts

Meter size| Joint size| Specification code for maintenance parts
---|---|---
inch(mm)| (ISO2852)| Gasket| Ferrule| ISO2852 Clamp
1 (25)| 2S| 3L8A0355P001| 3A8A7164P001| 4A8A2957P002
1 1/2 (40)| 2 1/2S| 3L8A0355P002| 3A8A7164P002| 4A8A2957P003
2 (50)| 3S| 3L8A0355P003| 3A8A7164P003| 4A8A2957P004
3 (80)| 4S| 3L8A0355P004| 3A8A7164P004| 4A8A2957P006
4 (100)| 5 1/2S| 3L8A0355P005| 3A8A7164P005| 4A8A2957P008

1. Note1: A pair of parts are packed in each specification code.
2. Note2: Tri-clamp® is available to use the same joint size instead of ISO2852 clamp except meter size 4″(100mm).

Misuse of this product can result in damages to property or human injury. Read related manuals carefully before using this product.

Specifications are subject to change without notice. © Toshiba Infrastructure Systems & Solutions Corporation 2024
All Rights Reserved.

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