Yokogawa EJX115A Bedienungsanleitung PDF herunterladen (Seite 5)

Supply unit

The supply unit must be certied by a Notied

body as FISCO model and following trapezoidal or

rectangular output characteristic is used.

Uo = 14...17.5 V (I.S. maximum value)

Io based on spark test result or other

assessment,

No specication of Lo and Co is required on the

certicate or label.

Cable

The cable used to interconnect the devices needs

to comply with the following parameters:

Loop resistance Rc: 15...150 Ω/km

Inductance per unit length Lc: 0.4...1 mH/km

Capacitance per unit length Cc: 45...200 nF/km

Length of spur cable: max. 60 m (IIC and IIB)

Length of trunk cable: max. 1 km (IIC) or 5 km

(IIB)

Terminators

The terminator must be certied by a Notied body

as FISCO model and at each end of the trunk

cable an approved line terminator with the following

parameters is suitable:

R = 90 . . . 102 Ω

C = 0 . . . 2.2 µF. (0.8...1.2 µF is required in

operation)

The resistor must be infallible according to IEC

60079-11.

Number of Devices

The number of devices (max. 32) possible on a

eldbus link depends on factors such as the power

consumption of each device, the type of cable used,

use of repeaters, etc.

● Entity Model

Non-Hazardous

Locations

Hazardous Locations

F0206_R03.ai

Terminator

Ex i

Field Instruments

(Passive)

Hand-

held-

Terminal

Supply Unit and

Safety Barrier

Terminator

Data

U

U

I

I.S. eldbus system complying with Entity model

I.S. values Power supply-eld device:

Po ≤ Pi, Uo ≤ Ui, Io ≤ Ii

Calculation of max. allowed cable length:

Ccable ≤ Co – ∑Ci – ∑Ci (Terminator)

Lcable ≤ Lo – ∑Li

Number of Devices

The number of devices (max. 32) possible on a

eldbus link depends on factors such as the power

consumption of each device, the type of cable used,

use of repeaters, etc.

c. ATEX Flameproof Type

Caution for ATEX ameproof type

Note 1. EJX series pressure transmitters with

optional code /KF21 for potentially

explosive atmospheres:

• No. KEMA 07ATEX0109

• Applicable Standard:

EN 60079-0:2006, EN 60079-1:2004,

EN 61241-0:2006, EN 61241-1:2004

• Type of Protection and Marking Code:

Ex d IIC T6...T4, Ex tD A21 IP6x T85, T100,

T120

• Group: II

• Category: 2G, 2D

• Enclosure: IP66 and IP67

• Ambient Temperature for gas-proof:

–50 to 75°C (T6), –50 to 80°C (T5),

and –50 to 75°C (T4)

• Maximum Process Temperature (Tp.) for

gas-proof:

85°C (T6), 100°C (T5), and 120°C (T4)

• Maximum Surface Temperature for dust-

proof:

T85°C (Tamb.: –40* to 40°C, Tp.: 85°C)

T100°C (Tamb.: –40* to 60°C, Tp.: 100°C)

T120°C (Tamb.: –40* to 80°C, Tp.: 120°C)

* –15°C when /HE is specied.

Note 2. Electrical Data

• Supply voltage: 32 V dc max.

Output current: 15 mA dc

Note 3. Installation

• All wiring shall comply with local installation

requirements.

• The cable entry devices shall be of a certied

ameproof type, suitable for the conditions of

use.

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