janitza UMG 806, Руководство пользователя и технические данные

Страница: 37 / 92

37
UMG 806 www.janitza.com
7.7 Temperature measurement
The UMG 806 has a temperature measurement
input. The temperature is measured via terminals 7
and 8 ("Pt100").
The measured values of the connections declared
as temperature inputs are obtained by determining
the average value from accumulated resistance
values. The meter calculates the temperature value
from the average value.
The device supports the temperature sensor
· PT100
ATTENTION
Damage to the meter and/or your system due to
a short circuit!
Inadequate insulation of the operating equipment
(e.g. the temperature sensor) at the temperature
measuring inputs with respect to the supply circuits
can cause damage to your meter and/or your
system.
·
Ensure a reinforced or double insulation
of your operating equipment with respect
to the supply circuits!
· Use shielded lines to connect the temperature
sensor!
· Do not exceed a total load of 0.35 kΩ (tem-
perature sensor and cable)!
Example of temperature sensor:
A temperature sensor is to measure near uninsu-
lated power lines in a 300 V CAT III network.
Solution:
Use reinforced or doubled insulation for the tem-
perature sensor for the 300V CAT III network! This
corresponds to a test voltage of 3000 V AC (1 min.
duration) for the temperature sensor.
Fig. Connection example for "temperature measurement".
PT100