Toshiba Sanitary Electromagnetic Flowmeter TIC-LF494B Manuel d'utilisateur télécharger pdf (Page 10)

TIC-LF494B

 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

Ω 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 (opt.), and DI (opt.) 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 (PROFIBUS)

(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) Use a PROFIBUS-PA cable for signal cable. In

addition, make sure to use a shielded cable to

improve noise resistance. Furthermore,

installation of signal cable in metal conduit is

recommended.

(3) General PROFIBUS-PA 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.

(4) When you carry out cable end treatment of

PROFIBUS-PA cable, 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.).

(5) Consider installing a PROFIBUS-PA arrester in

the communication path of PROFBUS-PA so

that the electromagnetic flowmeter will not be

affected by lightning etc.

(6) The electromagnetic flowmeter is not equipped

with terminating resistors.Use the terminating

resistor unit for PROFIBUS-PA

or junction box,

if necessary.

(7) Only one PROFIBUS-PA cable goes through a

cable gland of the Electromagnetic Flowmeter.

Please use the junction box at system

configuration

300

200

100

3 5 10 20 30 50 100 200

Conductivity (

S/cm)

Allowable cable length (m)

Figure 11. Electrical Conductivity and

Cable Length

 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

Flow rate

Size

(inch)

0.3ft/s 0.98ft/s 3ft/s 10ft/s 32.8ft/s

0.7781

2.334 7.115

23.72

77.81

1 ½

1.992

5.975 18.21

60.71

199.2

3.112

9.337 28.46

94.86

311.2

7.967

23.90 72.85

242.8

796.7

12.45

37.35 113.8

379.4

1,245

Table 3. Flow Rate and Flow Velocity (SI unit)

Unit: m

Flow rate

Size

(mm)

0.１ m/s 0.3 m/s 1.0 m/s 3 m/s 10 m/s

0.1767

0.5301 1.767

5.301

17.67

0.4523

1.357 4.523

13.57

45.23

0.7067

2.120 7.067

21.20

70.67

1.809

5.428 18.09

54.28

180.9

100

2.827

8.482 28.27

84.82

282.7

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

Commentaires sur ces manuels

Pas de commentaire

Toshiba Sanitary Electromagnetic Flowmeter TIC-LF494B Manuel d'utilisateur Page 10

Commentaires sur ces manuels

Produits connexes et manuels pour Matériel Toshiba Sanitary Electromagnetic Flowmeter TIC-LF494B