Releasing Key Lock Or Function Lock; Flow Rate Measurement (Only Differential Pressure) - Siemens SITRANS P DS III Operating Instructions Manual

Operation
6.5 Local operation
6.5.10

Releasing key lock or function lock

Releasing key lock
In the case of devices used for safety-relevant applications, only authorized personnel may
release the key lock, e.g. overflow protection.
To release a set key lock (LA, LO, LS) using buttons, proceed as follows:
Press the [M] button for 5 seconds.
Releasing the write protection
To release a write protection for HART (L) using buttons, proceed as follows:
Press the [M] button for 5 seconds.
6.5.11

Flow rate measurement (only differential pressure)

Introduction
The characteristic curve representing the relationship between the output current and input
pressure can be adjusted in mode 11. Adjust the root application point in mode 12.
You can select the following characteristic curve types of the output current in mode 11:
● linear "lin": proportional to differential pressure
● square root extracting "sroff": proportional to flow rate, deactivated up to the application
point
● square root extracting "srlin": proportional to flow rate, linear up to the application point
● square root extracting "srli2": proportional to flow rate, two-step linear up to the
application point
Variable application point
The output current for the "srlin" and "sroff" functions can be displayed linearly or set to zero
below the application point of the square root extracting characteristic curve.
96
WARNING
SITRANS P DS III with HART
Operating Instructions, 06/2013, A5E00047092-09