Siemens ET 77E Series Spezifikationen PDF herunterladen (Seite 10)

SD77

Ex ia Requirements:

Models 77abB1d

, 77abB3d, and 77abB5d are suitable for use in Zone 0 and Zone 1 surface industry explosive

atmospheres for gas groups IIA, IIB, and IIC. These models have been certified by Baseefa 2001 Ltd. as follows:

II 1 G Baseefa02ATEX0247X

Ex ia IIC T6 Ga with safety parameters of: Ui = 30V, Ii = 0.66A, Ci = 0, Li = 0, Pi = 1W

Choose suitable [Ex ia] (for Zone 0 or 1) or [Ex ib] (for Zone 1) devices with the parameters shown below.

Parameters:

Uo less than or equal to 30V

Ii less than or equal to 660 mA

P0 less than or equal to 1W

Co greater than or equal to the cable capacitance plus the capacitance of any other device(s) connected to

the Model 77

Lo greater than or equal to the cable inductance plus the inductance of any other device(s) connected to the

Model 77

Special Conditions for Safe Use

The enclosure of the Model 77 E/P Transducer may contain aluminum and must be deemed suitable for the intended

application and must also be protected against friction and impact.

Ex nA Requirements:

Models 77abB2d

, 77abB4d, and 77abB6d are suitable for use in Zone 2 surface industry explosive atmospheres.

Gas groups are not applicable since the Model 77 is considered non-sparking in accordance with EN50021:1999.

These models have been certified by Baseefa 2001 Ltd. with ratings as follows:

II 3 G Baseefa02ATEX0249X

Ex nA IIC T6 Gc Umax: 30V, Wmax: 2.3W

The supply power to these models may not exceed 30V and 2.3W.

Temperature Code Requirements:

All versions of the Model 77 have a temperature code of T6 referenced to an ambient of 40°C. No exposed surface

of the Model 77 exceeds 85°C when operated at an ambient temperature of 40°C. The Model 77 can be used with

gasses that do not ignite below 85°C.

Special Conditions for Safe Use

It must be ensured that the maximum voltage of the external circuit to which the Model 77 E/P Transducer is

connected cannot exceed 39.2 Vdc.

For these model numbers a, b, and d are variables defined in the Model 77 model number breakdown.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 41 42

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Siemens ET 77E Series Spezifikationen Seite 10