9.5 Limit Values
Two limit values (MAX, MIN) can be programmed and allocated to each
measuring channel. An exceeding of limit values is handled as a fault, similar
to an exceeding of meas. range limits and sensor breakage. On the display a
corresponding arrow
▲
or
▼
will appear next to the measured value, the alarm
relays will respond and the alarm values will be provided as output during the
measuring cycle (see manual 6.3.9). The alarm condition will persist until the
measured value has dropped below the limit value by the hysteresis. Generally,
the hysteresis is set to 10 digits, however, it can be adjusted to values between
0 and 99 digits (see 10.7). The exceeding of a limit value can also be used to
start or stop a measurement (see 9.10.4).
Function:
Limit value Max:
LimVal.Max: 123.4°C
Limit value Min:
LimVal.Min:
-----°C
Switching off the limit value:
<
OFF
>
Switching on the limit value:
<
ON
>
9.6 Scaling, Decimal Point Setting
For indicating the electrical signal of a sensor as a measured value of a
physical variable it is, in most cases, necessary to set a zero point shift and to
perform a multiplication with a certain factor. The functions BASE and
FACTOR are available for this. A detailed description of the scaling, including
an example, can be found in the manual section 6.3.11.
Indicated value
= (corrected measured value - BASE) x FACTOR.
The FACTOR can be programmed in the range from -2.0000 to +2.0000. For
factors over 2.0 or under 0.2 a corresponding decimal point setting must be
considered by entering the EXPONENT. The EXPONENT allows to shift the
decimal point to the left (-) or right (+) as far as it can be indicated on the
display and printer. An exponential presentation of the measured values is not
possible.
Function ´Base Value´ (input see 5.5):
BaseValue: ------
Function ´Factor´:
Factor: ------
Function ´Exponent´:
Exponent: 0
The correction arrow
!
will be indicated as status of the measured value, if
scaling values have been programmed and the actual measured value has
been altered.
52
ALMEMO
®
2590-9
Sensor Programming
