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TIC-LF654T
11
Wiring Precautions
(1) Explosion proof type flowmeters are not provided
with 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 10.
(4) DO1, DO2 and DI use the same common terminal
(COM). This COM can not be connected to other
equipment 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 to avoid the core wire of the
cable being nicked or damaged. In addition, for
cables, be careful of allowable maximum bend
diameter. (Do not allow excessive twisting or
bending of cables).
(4) The electromagnetic flowmeter is not equipped with
terminating resistors. Use the terminating resistor
unit for Modbus or junction box, if.
(5) Only one Modbus cable goes cable gland of the
Electromagnetic Flowmeter. Please use the junction
box at system configuration.
(6) Install a terminator to flowmeter that connected to
end of Modbus network.
300
200
100
3
5
10
30
50
3
5
10
20
30
50
100
200
Conductivity (S/cm)
Allowable cable length (m)
20
Figure 10. Electrical Conductivity and Cable
Length
Meter Size
To select the meter size:
See Table 2 and 3 to find meter sizes within the velocity
of 0.3 to 39.4 ft/s (0.1 to12m/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 39.4ft/s (12m/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
3.0ft/s
10 ft/s
39.4 ft/s
1/2'
0.2801
0.8403
2.561
8.532
33.61
1
0.7781
2.334
7.115
23.72
93.37
1 ¼
1.275
3.824
11.66
38.86
153.0
1 ½
1.992
5.975
18.21
60.71
239.0
2
3.112
9.337
28.46
94.86
373.5
2 ½
5.260
15.78
48.09
160.3
631.2
3
7.967
23.90
72.85
242.8
956.1
4
12.45
37.35
113.8
379.4
1,494
5
19.45
58.35
177.9
592.9
2,334
6
28.01
84.03
256.1
853.8
3,361
8
49.80
149.4
455.3
1,518
5,975
10
77.81
233.4
711.5
2,372
9,337
12
112.0
336.1
1,025
3,415
13,445
14
152.5
457.5
1,394
4,648
18,300
16
199.2
597.5
1,821
6,071
23,902
18
252.1
756.3
2,305
7,684
30,251