Siemens SIPROCESS GA700 User Manual

Functions
6.4 [2.03] Settings > Measuring ranges
Operating with the Local User Interface
104 Operating Manual, 06/2017, A5E31930478-05
The device lets you set measuring ranges permanently or switch them over automatically.
Contrary to the permanent setting, the measuring range follows the current measured value
with automatic switchover. You can define up to four measuring ranges for each component.
The start-of-scale values and the end-of-scale values are assigned to the low or high value
of the analog output (scaling of the analog output). The following settings are available:
● NAMUR
– Current range as per NAMUR NE043: 4 to 20 mA
– Alarm at <3.6 mA and >21 mA
● 4 to 20 mA or 20 to 4 mA
● 0 to 20 mA or 20 to 0 mA
Autoranging
Setting requirements
The following requirements must be met before autoranging can be activated:
● At least two measuring ranges are set and activated for a component.
● The measuring ranges border on each other or overlap.
● The spans of the set measuring ranges must increase (ms
i
> ms
(i+1)
)
Based on these requirements, the following two measuring range types described below are
derived for autoranging.
Measuring range type 1 (mr i < mr (i+1))
The full-scale value of measuring range
i
must be less than the full-scale value of the
following measuring range
(i+1)
. The following switchover points are used:
So
H
High switchover point (= full-scale value
minus 10 % of the span)
So
L
Low switchover point (= full-scale value
minus 20 % of the span)
FSV
Full-scale value
SSV
Start-of-scale value
When the high switchover point of a measuring range is exceeded, there will be a switch to
the next-higher measuring range. If the measured value is lower than the low switchover
point of the next-lower measuring range, the device switches to the lower measuring range.
Measuring range type 2 (mr i ≥ mr (i+1))
The full-scale value of measuring range
i
must be greater than or equal to the full-scale value
of the following measuring range
(i+1)
. Because the spans get bigger, the corresponding start-
of-scale values get smaller. The following switchover points are used:

Siemens SIPROCESS GA700 Specifications

General

Brand	Siemens
Model	SIPROCESS GA700
Category	Measuring Instruments
Language	English