Two-Point Adjustment With Setpoint Entry; Scaling - Ahlborn ALMEMO 2590-2 Operating Instructions Manual

11.3 Two-point adjustment with setpoint entry

For universal error correction at any 2 points
the function menu
provided. If the actual values at 2 points are
known , these can be written with the appropri-
ate setpoints. If not, 2 setpoint states must be
created and adjusted online. Usually, for the 1st
measuring point, a zero-point adjustment is per-
formed; however, any other setpoint is equally
possible. For the 2nd measuring point, a gain adjustment i performed and all cor-
rection values are recalculated; (see 12.7).
Two-point adjustment : (actual values are cleared)
1. Measuring point
Place the sensor in 1st status
(e.g. icy water, unpressurized, etc.),
Select setpoint 1 and enter :
Adjust measured value to setpoint 1 by pressing :
Measured value should now display setpoint 1 : 00:
2. Measuring point
Place the sensor in 2nd status
(boiling water, known weight, etc.)
For the 2nd measuring point enter setpoint 2 :
Adjust gain in function setpoint 2 by pressing :
Measured value should now display setpoint 2 : 00:
Correction value calculation
Also enter known actual values in function : actual val ue 1:
and calculate correction in function setpoint 2 by pressing :

If the sensor is locked, a confirmation request will appear asking
whether adjustment should indeed be performed.

11.4 Scaling

Sensors or transmitters with standardized signal
output will usually have to be scaled to be able
to display the physical variable. If 2 actual val-
ues and 2 setpoints have been entered, the
menu will, as described previously (see
SCALING
11.3), perform the task of calculating the scaling
values, base value and factor (see 12.6). The
desired units and the decimal point position
must also be entered.
Calculating the scaling values
After entering all the necessary parameters
the scaling values are calculated in function setpoint 2 by pressing :
Two-point adjustment with setpoint entry
two-point adjustment
is
TWO-POINT ADJUSTMENT
00: 1.67 °C Temperature
Actual val 1: ----- 2: -----
Setpoint 1:
4 Zero-point :
4 Gain :
ADJ ESC
00: 0.4 °C
actual val ue 1: -----
setpoint 1:
<ADJ>
0.0 °C
00: 99.45 °C
<ADJ>
100.0 °C
SCALING : 01:
Actual val 1: 04.000 2: 20.000
Decimal pt : 1
Setpoint 1: -100.0 2:
4 Gain :
5 Base value :
5 Factor :
ADJ ESC
ALMEMO ® 2590
0.00 2: 100.00
------ °C
------
F FCT
0.0
2: --- --
2: 100.0
0.4 2: 100.0
<ADJ>
4.67 mA
Units : °C
400.0
-----
720.0 °C
0.3125 E2
F ON
< ADJ >
37