Bronkhorst EX-FLOW Mass Flow Uživatelský manuál stáhnout pdf (Strana 8)

BRONKHORST HIGH-TECH B.V.

1.4 Bronkhorst High-Tech B.V. flowhead

The flowhead has the following type of protection:

II 2 G Ex ib IIC T4 Gb

II 2 G = ATEX group and category

ib = intrinsic safe in zone 1

IIC = most dangerous explosiongroup with ignitionenergy of 20 µJ

for example: Acetylene and Hydrogen

T4 = surface temperature max. 135°C.

Gb = IEC equipment protection level

There is one gas which has a more dangerous temperature-class;

has temperature class T5. This gas

may not be measured with our meters.

The signal processing is done with a pre-amplifier, which transforms the measuring signal into a linearised

current signal.

For the power of the heater, a "zero" current of 15mA has been chosen.

The output current varies from 15 to 20mA.

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Bronkhorst EX-FLOW Mass Flow Uživatelský manuál Strana 8