Limit Values; Scaling, Decimal Point Setting - Ahlborn ALMEMO 2590-2 Operating Instructions Manual

12. Sensor programming
Locking level
0
1
3
4
5
6
7
Function Locking mode :
In the
SENSOR PROGRAMMI NG
tom in such a way that the locked functions cannot be selected.

12.5 Limit values

Two limit values (MAXIMUM and MINIMUM) can be programmed per measur-
ing channel. Exceeding one of these limit values is treated as a fault (in the
same way as exceeding a measuring range limit or as sensor breakage). In the
display, in front of the measured value affected, the appropriate arrow  or 
appears and the alarm relays connected by relay cable are triggered (see
14.2). Limit values can also have relays assigned to them (see 12.12.2). This
alarm status remains effective until the measured value returns within the pre-
scribed limit value by the amount set as hysteresis. Hysteresis is normally set
to 10 digits but this can be adjusted to any number between 0 and 99 (see
13.7). The event of a limit value being exceeded can also be used to start or
stop a measuring operation (see 12.12.2).
Function
Enter limit value, maximum (see 8.5): 7 Limit value, maximum:
Limit value, minimum :
To disable limit values :
To enable limit values :

12.6 Scaling, Decimal point setting

To display the electrical signal of a sensor as a measured value in its physical
size it is nearly always necessary to perform a zero-point shift and multiplica-
tion by a factor. To perform these steps the functions BASE and FACTOR are
provided. For a detailed description of scaling, with an example, please refer to
the Manual, Section 6.3.11.
Displayed value = (corrected measured value - BASE) x FACTOR
48 ALMEMO
Locked functions
None
Measuring range + element flags + output mode
+ units
+ zero-point correction + gain correction
+ base value + factor + exponent
+ analog output, start and end
+ zero-point adjustment, temporary
+ limit values, maximum and minimum
menu the functions are listed from top to bot-
7 Limit val ue, minimum :
® 2590
Locking level :
123.4°C
-----°C
<OFF>
<ON>
5