SR882 operation manual
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2.3 Terminal connection
Before opening the terminal, please be sure to switch-off the power and pay
attention to the local electricity supply rules.
Input ports
Inputs T1
：
For PT1000 temperature sensor, used for measuring the temperature of collector.
Inputs T2
～
T6
：
for NTC10K
，
B=3950 temperature sensor, used for measuring the
temperature of storage or pipe.
VBus (485): for RS485 remote control connection.
Advice regarding the installation of temperature sensors:
1)
Only original factory enclosed Pt1000 temperature sensors are approved for use with
the collector, it is equipped with 1.5meter silicon cable and suitable for all weather
conditions, the temperature sensor and cable are temperature resistant up to 280
o
C,
not necessary to distinguish the positive and negative polarity of the sensor connection.
2)
Only original factory enclosed NTC10K,B=3950 temperature sensors are approved for
use with tank and pipe, it is equipped with 1.5meter PVC cable, and they are
temperature resistant up to 105
o
C, not necessary to distinguish the positive and
negative polarity of the sensor connection.
3)
All sensor cables carry low voltage, and to avoid inductive effects, must not be laid
close to 230 volt or 400-volt cables (minimum separation of 100mm)
4)
If external inductive effects are existed, e.g. from heavy current cables, overhead train
cables, transformer substations, radio and television devices, amateur radio stations,
microwave devices etc, then the cables to the sensors must be adequately shielded.
5)
Sensor cables may be extended to a maximum length of ca. 100 meter, when cable’s
length is up to 50m, and then 0.75mm
2
cable should be used. When cable’s length is
