User manual

OPERATION MANUAL
Technical changes reserved
0141 0316-186 21.08.2015
Temperature probe DS18S20 with
PUR-cable and RJ12 connector
Installing and conguration
The Dallas temperature sensor of type 1820 has an internal iden-
tication (serial number) and can be operated in parallel together
with several other components on a three-wire bus. After wiring all
the sensors, the PC adapter must be individually congured for the
connected sensors. Operation is not possible without prior congu-
ration of the system. Since the conguration 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 congura-
tion needs to be repeated.
The sorting of probes, found on the network, is done on the basis of
binary serial number.
Pin conguration of RJ12-plug connector
The Western-plug connector is congured as follows (View on the
cable, i.e. contact surfaces of the plug!):
1 Shielding or unoccupied
2 Ground
3 Dallas Data or unoccupied
4 Dallas Data
5 +5 V
6 +5 V or unoccupied
Measuring accuracy
The sensors are calibrated during manufacture and have a typical
measuring accuracy of ±0.5 °K 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 object-
sensor
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
thermal 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 mate-
rial is a bad thermal conductor or if the connecting wire is tempered
with the measuring object.
In principle, of course, the highest measuring accuracy is achieved
through immersion in liquids or in a mounting tube. However, an addi-
tional 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
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon [phone] | Fax [phone] | [e-mail] | bb-sensors.com
2 / 2