Process Control - Ahlborn ALMEMO 2470-1S Operating Instruction

5. Introduction
pressure sensors, and O2 sensors; on this device this is performed automatic-
ally by means of an integrated atmospheric pressure sensor.
Measured value smoothing
Measured values of an unstable, fluctuating nature can be smoothed by taking
a sliding average over a number of values programmable from 2 to 99.
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, output, or
deleted from memory.
Individual value memory (2470-2 only)
Up to 99 measured values can be saved manually. This data can then be
shown on the display or output via the interface.
Differential measurement (2470-2/2S only)
It is possible, by setting the measured value to zero, to perform relative meas-
uring operations with respect to a reference value; with 2 sensors and the
same measured variables genuine differential measuring operations can be
performed.

5.1.3 Process control

In order to record the measured values from all connected sensors in digital
form measuring point scanning must be performed continuously with meas-
ured value output according to a time-based process control. This may be per
cycle or, if rapid results are required, at the measuring rate itself. The measur-
ing operation can be started and stopped by means of the keypad, the inter-
face, an external trigger signal, or a specified limit value being exceeded.
Date and time-of-day
Date and time-of-day can be set and then used for the purpose of logging
measuring operations. When batteries are replaced these date and time set-
tings are lost and will have to be reset.
Cycle
The cycle can be programmed to any value between 0:00:01 (1 second) and
9:59:59 hh:mm:ss. This function permits cyclic output of measured values to
the interfaces and cyclic calculation of average values.
Print cycle factor
The print cycle factor can be used to restrict data output from particular chan-
nels; this may prove necessary in order to reduce excessive data flow espe-
cially 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 val-
ues can then be output and saved on a cyclic basis to function channels
provided for this purpose.
12 ALMEMO 2470