Process Control - Ahlborn ALMEMO 2590-2A Operating Instructions Manual

5. Introduction
Maximum and minimum values
For each measuring operation the maximum value and minimum value are ac-
quired and saved to memory. These values can then be displayed, or deleted
from memory.
Average value
Manual averaging is available per channel over a certain period or cycle or over
a series of individual measuring operations. Networked measuring (Option
VN)permits a standardized volume flow measurement.
Measured value memory
Up to 100 measured values can be saved manually. This data can then be
shown on the display or output via the interface.

5.1.3 Process control

To record the measured values from all connected sensors in digital form meas-
uring point scanning is performed continuously with measured value output ac-
cording to a time-based process control. This may be per output cycle or, if really
rapid results are required, at the measuring rate itself. In data logger mode a
measuring operation can be started and stopped by means of the keyboard, the
interface, an external trigger signal, the real-time clock, or by a specified limit
value being exceeded.
Date and time-of-day
All measuring operations can be accurately logged using the real-time clock with
date function or in terms of the pure measuring time. For the purposes of starting
/ stopping a measuring operation, the start / stop date and time-of-day can be
programmed.
Cycle
The cycle can be programmed to any value between 00:00:01 (1 second) and
59:59:59 hh:mm:ss. This function permits cyclic output of measured values to
the interfaces or to the memory and provides cyclic calculation of the average
value.
Print cycle factor
The print cycle factor can be used to limit data output from particular channels;
this may be necessary in order to reduce excessive data flow especially while
data is being saved.
Averaging over measuring point scans
The measured values from measuring point scans can be averaged either over
the whole measuring duration or over the specified cycle. These average values
can then be output and saved on a cyclic basis to function channels provided
for this purpose.
Measuring rate
The measuring points are continuously scanned at the measuring rate (2.5 or
10 mops). Recording can be accelerated if all measured values are stored to
memory and / or output to the interface at the measuring rate.
Measured value memory
On data logger 2590-4AS all measured values can be saved to an EEPROM
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