OPERATION MANUAL
Technical changes reserved
0141 0316-143 20.04.2016
Temperature probe DS18S20 with
connection cable and RJ11 plug
Installing and configuration
The Dallas temperature sensor of type 1820 has an internal identifica
-
tion (serial number) and can be operated in parallel together with seve-
ral other components on a three-wire bus. After wiring all the sensors,
the PC adapter must be individually configured for the connected sen
-
sors. Operation is not possible without prior configuration of the system.
Since the configuration is stored in the internal EEPROM of adapter,
this process is to be done only once. Only if an additional sensor is to be
used on the existing network, the configuration needs to be repeated.
The sorting of probes, found on the network, is done on the basis of
binary serial number.
Pin configuration of RJ11-plug connector
The Western-plug connector is configured as follows (View on the
cable, i.e. contact surfaces of the plug!):
1 Unoccupied
2 Ground
3 Dallas Data or unoccupied
4 Dallas Data
5 +5 V
6 Unoccupied
In 4-core flat cable, PIN 1 and PIN 6 are not occupied. PIN 3 and 4 are
bridged together at the PC-adapter. Only PIN4 is needed to connect
the data line of the sensor.
Measuring accuracy
The sensors are calibrated during manufacture and have a typical
measuring accuracy of ±0.5 °C at 23 °C application temperature. At
the upper and lower limit of measuring range, the accuracy is some-
what on the lower side. Further information is available in the data
sheet of component at the website of manufacturer.
During all temperature measurements, the physical conditions are also
to be taken care of in order to avoid measuring error, which mainly
decides the precision of measuring arrangement.
Thermal transition resistance of
measuring objectsensor
This is the main measuring error which occurs during surface mea-
surements. This can be eliminated by providing good thermal contact
through mounting in a tube, applying thermal conducting paste or ther-
mal conducting adhesive.
Thermal heat transfer of sensor-ambient temperature
During surface measurements, the measuring arrangement should
be thermally insulated from the surroundings, for example, with some
foam material or mineral wood.
Thermal heat transfer of sensor-connecting wires
This measuring error can be minimised by itself, for example, if the
connecting lead used is as thin as possible and the connecting material
is a bad thermal conductor or if the connecting wire is tempered with
the measuring object.
In principle the highest measuring accuracy is achieved through immer-
sion in liquids or in a mounting tube. However, an additional measuring
error should be included while taking measurements on surfaces.
Accessories
Accessories
Articleno.
Distribution box for temperature
measuring system, 10 sockets
RJ12
VERT-GEH
Temperature measuring system
TLOG with RS232-Interface
0567 0002
Temperature measuring system
TLOG with USB-Interface
0567 0004
Humidity/temperature measu-
ring system with USB-interface
Hytelog Multisensor USB
0567 0001
Attention
Please avoid extreme mechanical and inappropriate exposure.
The device/product is not suitable for potential explosive areas and
medical-technical applications.
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon +49 771 83160 | Fax +49 771 8316-50 | [email protected] | bb-sensors.com
2 / 2
