2.3 - ELECTRICAL CONNECTIONS
To access the terminal block remove the cover by unscrewing 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 20 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.
Ascon Tecnologic S.r.l.
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 instrument to which the probe has to be connected has to be
provided with a current input 4... 20 mA type.
To have a correct measure indication is necessary to set the lower
and upper input limits.
These limits are the corresponding value to 4 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 11 probe are:
Lower limit (4 mA): 0
Upper limit (20 mA): 100
4 - PROBLEMS, MAINTENANCE AND WARRANTY
4.1 - MEASURE ERRORS
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 condensate 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 condensation 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 is recommended 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
humidity 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 Ascon Tecnologic with the
detailed description of the failures found and without any fees or
charge for Ascon Tecnologic, safe different agreements.
5 - TECHNICAL DATA
5.1 - ELECTRICAL DATA
Power supply: 9... 30 VDC
Power consumption: 20 mA max.
Humidity sensor type: Capacitive
External load: 250
Ω
max.
Output signal : 4...20 mA (0... 100%RH)
Protection class against electric shock: Class III
5.2 - MECHANICAL DATA
Housing: plastic
Dimensions: 80 x 80 mm, depth 52 mm
Weight: 125 g approx.
Mounting: Wall mounting
Connections: 2.5 mm
2
screw terminal block
Recommended connection cable: 2 x 0.75 or 2x1 mm
2
Box protection : IP 65
Air filter: Polyethylene
Operating temperature: -30... 70 °C
Operating humidity: 0... 100 RH%
Storage temperature: -30... 80 °C
Maximum workplace pollutant concentration:
Acetone (CH3COCH3)
1000 ppm
2400 mg/m
3
Ammonia (NH3)
25 ppm
18 mg/m
3
Petrol
300 ppm
1200 mg/m
3
Chlorine (Cl2)
1 ppm
1.5 mg/m
3
Acetic Acid (CH3COOH)
10 ppm
25 mg/m
3
Ethyl Acetate (CH3COOC2H5)
400 ppm
1400 mg/m
3
Ethanol (C2H5OH)
1000 ppm
1900 mg/m
3
Ethylene Glycol (HOCH2CH2OH)
100 ppm
260 mg/m
3
Formaldehyde (HCHO)
1 ppm
1.2 mg/m
3
Isopropanol ((CH3)2CHOH)
400 ppm
980 mg/m
3
2-Butanone (C2H5COCH3)
200 ppm
590 mg/m
3
Hydrochloric Acid (HCl)
5 ppm
7 mg/m
3
Sulphur Dioxide (SO2)
5 ppm
13 mg/m
3
Hydrogen Sulphide (H2S)
10 ppm
15 mg/m
3
Nitrogen Oxides (NOx)
5 ppm
9 mg/m
3
Toluene/Xylene (C6H5CH3)
100 ppm
380 mg/m
3
Ascon Tecnologic - TRH 11
- OPERATING INSTRUCTIONS - Vr. 02 - PAG. 2
