Siemens SITRANS P500, Руководство по эксплуатации, Страница: 20 / 238

Description
3.2 Application range
SITRANS P500 with HART
20
Operating Instructions, 12/2014, A5E02344528-09
3.2 Application range
Overview
Depending on the variant, the pressure transmitter measures corrosive, non-corrosive and
hazardous gases, vapors and liquids.
With appropriate configuration, you can also use the differential pressure transmitter for the
following measurement types:
● Level
● Volume
● Mass
● Volume flow
● Mass flow
The output signal is always a load-independent direct current between 4 and 20 mA upon
which a HART protocol is superimposed.
You can install the "intrinsically-safe" or "explosion-proof" version of the pressure transmitter
in hazardous areas. The devices have an EC type-examination certificate and meet the
regulations applicable to them, for example, the harmonized CENELEC standards in Europe.
Pressure transmitters with remote seals of different shapes can be delivered for special
applications. For example, measuring high-viscosity substances is a special application.
Differential pressure and flow rate
This version measures corrosive, non-corrosive and hazardous gases, vapors and liquids.
You can use this version for the following measurement types:
● Differential pressure
● Positive or negative relative pressure
● In combination with a restrictor device: flow rate q ~
The smallest differential pressure span is 1.25 mbar (0.5 inH
2
O); the largest differential
pressure span is 32 bar (465 psi).
Level
This version with mounting flange measures the level of non-corrosive, corrosive and
hazardous liquids in open and closed containers. The smallest measuring span is 1.25 mbar
(0.5 inH
2
O); the largest span is 6.25 bar (2509 inH
2
O). The nominal diameter of the mounting
flange is DN 80 or DN 100 or 3" or 4".
The negative connection of the measuring cell is kept open when measuring the level of
open containers. This measurement is referred to as "measurement against atmosphere".
The negative connection is normally connected with the container when measuring the level
of closed containers. This balances the static pressure.