Table of Contents
Advertisement
11.2.5 Temperature compensation
Sensors whose measured values depend heavily on the temperature of the
measuring medium usually incorporate their own temperature sensor and per-
form temperature compensation automatically; (see Section 12.3.9Measuring
range list ´with TC´). However, dynamic pressure probes and pH probes are
also available without their own temperature sensor. If the temperature of the
medium deviates from 25°C the following measuring errors must be considered
e.g. Error per 10 °C:
Dynamic pressure approx. 1.6 %
pH probe approx. 3.3 %
Compensation at constant temperature can be activated via function
e.g. in the menu
comp.
Enter the compensation temperature in function
Continuous temperature compensation with external temperature sensors can
be activated either via the reference channel of the sensor to be compensated
or by configuring any temperature sensor as reference sensor with a ´*T´ in the
designation; (see 10.3.2) :
While the temperature is being measured, point T flashes.
Automatic temperature compensation can be switched off by pro-
gramming the reference channel for the measuring point to itself.
11.2.6 Atmospheric pressure compensation
Some measured variables depend on the ambient atmospheric pressure (see
Section 12.3.9 Measuring range list ´with PC´) with the effect that large devia-
tions from normal pressure (1013 mbar) may lead to measuring errors.
e.g. error per 100 mbar
Rel. humidity psychrometer approx. 2 %
Mixture ratio, capacitive
Dynamic pressure
O2 saturation
It is advisable therefore, especially when taking measurements at appreciable
heights above sea level to take due account of the atmospheric pressure (ap-
prox. -11 mbar / 100 m above mean sea level, MSL). This can be programmed
(see 12.5.6) or it can be measured using a suitable sensor (reference sensor
with designation ´*P´, see Manual 6.7.2).
Atmospheric pressure
The function
set in the standard menu
Enter atm. pressure in the function Atm. pressure
Measured value correction and compensation
Compensation range
-50 to 700 °C
0 to 100 °C
Measured value correction
approx. 10 %
approx. 5 %
approx. 10 %
can be integrated into any user menu or be
Device Configuration
Atmosph. pressure CP 1013 mbar
:
Temp.comp: CT 31.2 °C
Temp.comp. CT 23.5 °C
Compensation range
500 to 1500 mbar
Vapor pressure VP up to 8 bar
800 to 1250 mbar (error < 2 %)
500 to 1500 mbar
.
ALMEMO
®
5690-2M
Sensor
NiCr-Ni
NTC or Pt100
Temp
35
Advertisement
Table of Contents
