Service

Process transmitter

Can a 3-wire transmitter also work in a 2-wire configuration?

No.

Can each pressure transmitter measure any medium?

No, the materials stated in the data sheet are to be checked by the customer for resistance.

Can the connector be altered?

The electrical connection cannot be altered.

Can you switch between 4 ... 20 mA and 0 ... 10 V?

No, the output signal is defined in the order and cannot be changed.

What causes zero point drift?

Through the ageing of the electrical components, through temperature and load cycling.

What level of pressure can tear a diaphragm?

The respective burst pressure. This is listed in the data sheet for each product.


What solutions are there against pressure spikes?

For this, we recommend a process connection with a 0.6 mm, or better a 0.3 mm, spark-eroded channel.

Will a pressure transmitter also work without a power supply?

No.

What does NAMUR stand for?

NAMUR is the abbreviation for "Normenausschuss Mess- und Regeltechnik" (Standards committee for measurement and control).

What is ATEX?

ATEX is a widely-used synonym for the European Union ATEX directives. The name comes form the abbreviation of the French 'Atmosphere explosible'. The directive currently includes two directives in the field of explosion protection, namely the ATEX equipment directive, 94/9/EC, and the ATEX workplace directive, 99/92/EC.

What are the signalling values in accordance with NAMUR?

NAMUR Downscale: 3.5 mA
NAMUR Upscale: 21.5 mA

What do the designations of Temperature Class mean?

The ignition temperature is the lowest temperature at which an inflammable mixture of gases can ignite at a flame, a hot surface or otherwise generated spark. Gases and vapours are divided into Classes in which the temperature of the surface must always be lower than that of the mixture. (T1 > 450 °C, T2 > 300 °C, T3 > 200 °C, T4 > 135 °C, T5 > 100 °C, T6 > 85 °C).

What do the Zones in explosion protection mean?

Gases:
Zone 0 (Category 1): permanent or long-term danger of explosions
Zone 1 (Category 2): hazardous atmosphere occasionally exists
Zone 2 (Category 3): explosive atmosphere exists only rarely, and then only for a short time

Dusts:
Zones 20, 21, 22 with the same meanings

What is the value of the current at the output limits in accordance with NAMUR?

Lower output limit in accordance with NAMUR is 3.8 mA (other value possible)
Upper output limit in accordance with NAMUR is 20.5 mA  (other value possible)