Ahlborn ALMEMO 2590-2A - 12.3 Two-point adjustment with setpoint entry

12. Function menus
43
To clear all measured values, if necessary, press key < CLRA >
The average value of the array is displayed continuously:
average val : 15.11 m¡
To cancel the measuring operation press key : < ESC >
To proceed to the 3rd menu press key : < VOL ►>
Display of volume flow in m
3
/h = Average value of flow [m/s] x cross-section [cm
2
]
It is possible to display the standardized volume
referred to 20°C and 1013mbar if the temperature
and atmospheric pressure are measured at the
measuring point in question; (see temperature
compensation 11.2.4 and atmospheric pressure
compensation 11.2.5).
Select the function
standardized
and activate :
standardized :
Save data and output
If a SD-card memory connector connected, all data can be saved to a special vol-
ume flow file by pressing key : <STORE>
The tabular format of the data is shown on the previous page. The data can
command 'P49' (s. manual sec. 6) can also be read through the interface, and
then imported for processing in an Excel spreadsheet.
12.3 Two-point adjustment with setpoint entry
For universal error correction at any 2 points the
function menu
two-point adjustment
is provided.
If the actual values at 2 points are known , these
can be written with the appropriate setpoints. If
not, 2 setpoint states must be created and ad-
justed online. Usually, for the 1st measuring point,
a zero-point adjustment is performed; however, any
other
setpoint is equally possible. For the 2nd measuring point, a gain adjustment i per-
formed and all correction values are recalculated; (see 13.7).
Two-point adjustment : (actual values are cleared)
1. Measuring point
Place the sensor in 1st status
00: 0.4 °C
(e.g. icy water, unpressurized, etc.),
actual value 1: -----
Select setpoint 1 and enter :
setpoint 1: 0.0
Adjust measured value to setpoint 1 by pressing : <ADJ>
Measured value should now display setpoint 1 :
00: 0.0 °C
2. Measuring point
Place the sensor in 2nd status
00: 99.45 °C
(boiling water, known weight, etc.)
2: -----
For the 2nd measuring point enter setpoint 2 :
2: 100.0
Adjust gain in function setpoint 2 by pressing : <ADJ>
Measured value should now display setpoint 2 :
00: 100.0 °C
Correction value calculation