Yokogawa Wireless Temperature Transmitter YTA510 User Manual

Page 51

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<8. Handling Caution>

8-11

IM 01C50T02-01E

Installation Diagram

(Installation Diagram for Intrinsically

Safe)

Non Hazardous Location

Hazardous Location

F0810.ai

Terminator

Safety Barrier

Temperature

Transmitter

Terminator

+

Transmitter

+

Transmitter

+

1

2

3

4

5

SUPPLY

C(*)

+

+

SENSOR

(*)‘C’ and ‘–’ may be shorted.

Note

• In the rating 1 (*1), the output current of the

barrier must be limited by a resistor ‘Ra’such

that Io=Uo /Ra.

• In the rating 2 (*2), the output of the barrier must

be the characteristics of the trapezoid or the

rectangle and this transmitter can be connected

to Fieldbus equipment which are in according to

the FISCO model.

• The safely barrier may include a terminator.

• The terminator may be built in by a barrier.

• The terminator and the safety barrier must be

certified by Ex certification bodies.

• More than one field instruments may be

connected to the power supply line.

• Do not alter drawing without authorization from

Ex certification bodies.

• Input voltage of the safety barrier must be less

than 250Vrms/V dc.

Electrical Data:
• Supply Input (+ and –)

Maximum Input Voltage Ui: 24 V *

1

Maximum Input Current Ii: 250 mA *

1

Maximum Input Power Pi: 1.2 W *

1

Maximum Internal Capacitance Ci: 1.5 nF *

1

Maximum Internal Inductance Li: 8 µH *

1

or

Maximum Input Voltage Ui: 17.5 V *

2

Maximum Input Current Ii: 360 mA *

2

Maximum Input Power Pi: 2.52 W *

2

Maximum Internal Capacitance Ci: 1.5 nF *

2

Maximum Internal Inductance Li: 8 µH *

2

or

Maximum Input Voltage Ui: 17.5 V *

2

Maximum Input Current Ii: 380 mA *

2

Maximum Input Power Pi: 5.32 W *

2

Maximum Internal Capacitance Ci: 1.5 nF *

2

Maximum Internal Inductance Li: 8 µH *

2

• Sensor Output (1 to 5)

Maximum Output Voltage Uo: 7.7 V

Maximum Output Current Io: 70 mA

Maximum Output Power Po: 140 mW

Maximum External Capacitance Co: 1.6 µF

Maximum External Inductance Lo: 7.2 mH

FISCO Rules

The FISCO Concept allows the interconnection

of intrinsincally safe apparatus to associated

apparatus not specifically examined in such

combination. The criterion for such interconnection

is that the voltage (Ui), the current (Ii) and the

power (Pi) which intrinsically safe apparatus can

receive and remain intrinsically safe, considering

faults, must be equal or greater than the voltage

(Uo, Voc, Vt), the current (Io) and the power (Po)

which can be provided by the associated apparatus

(supply unit). In addition, the maximum unprotected

residual capacitance (Ci) and inductance (Li)

of each apparatus (other than the terminators)

connected to the fieldbus must be less than or

equal to 5 nF and 10 µH respectively.
In each I.S. fieldbus segment only one active

source, normally the associated apparatus, is

allowed to provide the necessary power for the

fieldbus system. The allowed voltage Uo of the

associated apparatus used to supply the bus

is limited to the range of 14 V dc to 24 V dc. All

other equipment connected to the bus cable has

to be passive, meaning that the apparatus is not

allowed to provide energy to the system, except

to a leakage current of 50 µA for each connected

device.

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