Temperature Compensation - Ahlborn ALMEMO 2590-2 Operating Instructions Manual

3. Setting up a means of calibration for the slope.
To select the measured value function press key(s)
Measured value shows e.g.
To initiate gain adjustment press key(s)
Context-sensitive help window
with setpoint appears.
To modify the setpoint, if necessary, press key(s)
To perform gain adjustment press key(s)
On pH probes the gain error shows the
the deviation from the rated value and thus
the status of the probe.

10.2.4 Temperature compensation

Sensors whose measured values are heavily
dependent on the temperature of the measuring
medium usually incorporate their own tempera-
ture sensor and perform temperature compen-
sation automatically; (see Section 12.9 Measur-
ing range list ´with TC´). However, dynamic
pressure probes and pH probes are also avail-
able without their own temperature sensor.
If the temperature of the medium deviates from 25°C the following measuring
errors must be considered :
e.g. Errors per 10 °C
Dynamic pressure
pH probe approx. 3.3%
For temperature compensation of these sensors there are 2 possibilities :
Enter compensation temperature
in function
Both in this function and in the measured value the symbol
Continuous temperature compensation with external temperature sensors
can be activated either via the reference channel (see 12.12.6) of the sensor to
be compensated or by configuring any temperature sensor as reference sen-
sor with a ´*T´ in the designation (see 12.2).
While the temperature is being measured, a point flashes
behind the symbol ´CT´

Flow values (velocity or volume flow) acquired with temperature com-
pensation can by means of ´#N´ in the designation (see 12.2) be con-
verted to standard conditions of 20°C (see Manual 6.7.5).
Measured value correction and compensation
Compensation range
approx. 1.6%
0 to 100 °C
PROG
00: 04.45 pH
<ADJ>
Sensor ad justment to
Setpoint
PROG ... (see 8.5).
< OK >
Gain error
25.45 m/s
13:
L840 flow
Temp comp CT
Atm press. CP
03: 21.67 Pa dyn pressure
MENU M
Sensor
-50 to 700 °C NiCr-Ni
Ntc or Pt100
Temp. comp. CT
appears.
´CT´
temp. comp. CT.
ALMEMO ® 2590
4.00 pH
9 %
CTP º
31.0 °C
1027 mbar
©©F FCT
31.0°C
23.5°C
25