2.3 - ELECTRICAL CONNECTIONS
To access the terminal block remove the cover by unsrewing the
two screws on it.
Avoid touching any electronic components and carry out the
electrical wiring connecting one wire only for each terminal,
according to the following diagrams, checking that the power supply
is the same as indicated on the instrument.
Use the cable gland to make the cable exit and check the correct
grip of the same and of the cover box to obtain the declared
protection degree.
Check then if the measure instrument is equipped with a voltage
output 9...30 VDC able to supply at least 50 mA, otherwise
connecting the probe with an external voltage supply 9...30 VDC
able to supply the necessary current as previously described and
connecting it following the wiring diagrams.
It's strongly recommended to use cables with proper insulation,
according to the working voltages and temperatures.
Furthermore, the cable of the probe has to be kept separate from
line voltage wiring in order to avoid electromagnetic noises
infiltration.
If the input cable of the probe is screened, it advisable to connect it
on the ground with one side only.
Tecnologic S.p.A. and its legal representatives are not
responsible for any eventual damages to people, things or
animals deriving from the instrument violation, not proper or
wrong use or in any case not in accordance with the instrument
features.
2.4 - ELECTRICAL CONNECTION DRAWING
Wiring diagram with instrument supply :
Wiring diagram with external supply :
3 - OPERATING MODE
The instruments to which the probe has to be connected has to be
provided with a current input 0 ... 20 mA type.
To have a correct measure indication is necessary to set the lower
and upper input limits.
These limits are the corrisponding value to 0 mA (lower limit or
beginning of scale) and 20 mA (upper limit or ending of scale) which
have to be displayed.
See on the operating instructions of the measure instrument the
setting mode of these limits.
The set values for TRH 12 probe are:
Lower limit umidity measure (0 mA) : 0
Upper limit umidity measure (20 mA) : 100
Lower limit temperature measure (0 mA) : -30 (°C) or -22 (°F)
Upper limit temperature measure (20 mA) : 70 (°C) or 158 (°F)
It's possible to use instruments with input 4 ..20 mA, in this case the
limits to set will be:
Lower limit umidity measure (4 mA) : 20
Upper limit umidity measure (20 mA) : 100
Lower limit temperature measure (4 mA) : -10 (°C) or 14 (°F)
Upper limit temperature measure (20 mA) : 70 (°C) or 158 (°F)
4 - PROBLEMS, MAINTENANCE AND WARRANT
4.1 - MEASURE ERRORS
Umidity reading errors can occur if settling time is too short, or be
caused by steam, sprayed water, air drafts, direct exposure to
sunlight, or presence of condesate on the sensor.
To obtain accurate measurements the sensor should be left to settle
in the existing atmosphere for some time.
To reduced the possibility of condesation on the humidity sensor
place the probe in ventilated position and where there is not a quick
and elevation variation of temperature (from cold to warm)
4.2 - CLEANING
It’s raccomanded to clean the box only with a cloth welted with water
or with a detergent neither abrasive nor containing solvents.
Should be necessary to remove the protective cap, do not cause
any mechanical stress to the sensors and absolutely avoid touching
the umidity sensor.
4.3 - WARRANTY AND REPAIRS
The instrument is under warranty against construction vices or
defected material, noticed within 12 months from delivery date.
The warranty is limited to the repairs or to the substitution of the
instrument.
The eventual violation of the instrument or the wrong use and
installation of the product means the automatic decay of the
warranty.
In case of defected instrument, noticed in warranty period or out of
warranty, do contact our sales department to obtain the shipment
authorisation.
The defected product must be shipped to TECNOLOGIC with the
detailed description of the failures found and without any fees or
charge for Tecnologic, safe different agreements.
5 - TECHNICAL DATA
5.1 - ELECTRICAL DATA
Power supply: 9 ... 30 VDC
Power consumption:50 mA MAX
Humidity sensor type: Capacitive
Temperature sensor type: RTD Pt100 (class B)
External load: 250 ΩMAX
Humidity output signal : 0...20 mA (0 ...100 %RH)
Temperature output signal : 0...20 mA (-30 ...70 °C )
Protection class against electric shock: Class III
5.2 - MECHANICAL DATA
Housing: plastic
Dimensions: 80 x 80 mm, depth 52 mm
Weight: 130 g approx.
Mounting: Wall mounting
TECNOLOGIC - TRH 12 - OPERATING INSTRUCTIONS - Vr. 01 - ISTR 05833 - PAG. 2
