Ascon tecnologic TRH301 User manual

Ascon Tecnologic - TRH301 - USER MANUAL - PAG. 1
TRH301
RELATIVE HUMIDITY
AND TEMPERATURE
MEASUREMENT SENSOR
User manual
22/10 - Code: ISTR_M_TRH301_E_01_--
ASCON TECNOLOGIC S.r.l.
Viale Indipendenza 56, 27029 - VIGEVANO (PV) ITALY
TEL.: [phone] - FAX: [phone]
sito: http:\\www.ascontecnologic.com
e-mail: [email protected]
PREFACE
D This manual contains the information necessary for the
product to be installed correctly and also instructions for
its maintenance and use; we therefore recommend that
the utmost attention is paid to the following instructions
and to save it.
This document is the exclusive property of Ascon Tecnologic
S.r.l. which forbids any reproduction and divulgation, even par-
tially, of the document, unless expressly authorized.
Ascon Tecnologic S.r.l. reserves the right to make any formal or
functional changes at any moment and without any notice.
Ascon Tecnologic S.r.l. and its legal representatives do not
assume any responsibility for any damage to people, things or
animals deriving from violation, wrong or improper use or in
any case not in compliance with the instrument features.
D Whenever a failure or a malfunction of the device may
cause dangerous situations for persons, thing or animals,
please remember that the plant has to be equipped with
additional devices which will guarantee safety.
1. INSTRUMENT DESCRIPTION
1.1 General description
The probes of the TRH301 series are devices characterized
by a very low energy consumption and with an external dis-
sipative element in the case of the 2-wire versions.
These features allow an excellent measurement accuracy
even in conditions of poor ventilation; all devices are also
built to have an excellent protection degree.
2. USAGE WARNINGS
2.1 Admitted usage
D The instrument has been projected and manufactured
as a measuring and control device to be used accord-
ing to EN60730-1 at altitudes operation below 2000 m.
Using the instrument for applications not expressly permitted
by the above mentioned rule must adopt all the necessary
protective measures.
The instrument must not be used in dangerous environ-
ments (flammable or explosive) without adequate protections.
D The installer must ensure that the EMC rules are
respected, also after the instrument installation, if
necessary using proper filters.
3. INSTALLATION WARNINGS
3.1 Mounting requirements
Select a mounting location having the following characteristics:
• It should be easily accessible;
• It must not be subjected to vibrations or impacts;
• Must be free from corrosive gases;
• Must be free from water or other fluids (condensation).
3.2 Installation position
Wall fixing is done by clips. Particular attention must be paid
to the sensor positioning, it must be kept away from heat
sources that can influence the humidity measurement.
In the design of the TRH301 probe, an attempt was made to
limit, as much as possible, the sensor self-heating possibility,
minimizing energy consumption and taking the dissipative
element necessary in the case of a 2-wire sensor away from
the sensor.
It is a good idea to mount the probe with the sensor facing
downwards (output cable upwards) and NEVER with the
sensor facing upwards and also horizontally to avoid possi-
ble measurement errors due to self-heating.
In the case the sensor filter should be cleaned, the pro-
be must be disassembled, then access the protective cap
(which can be replaced). Avoid touching the humidity sensor
and be careful not to lose the sealing o-rings.
NO
OK
NO
BEST
Cable

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Any error in humidity measurement may be due to the settling
time of the probe, in this case it will be necessary to wait for
the time necessary to achieve a stable measurement.
Steam jets, water sprays, drafts, direct sun exposure, conden-
sation on the sensor or mounting on a wall made cold by the
outside temperature can also cause important measurement
errors; due to these conditions, during the installation, the
probe must be protected from any possible external influence.
3.3 Electrical Connections
General notes on electrical connections
• The probe cables must be kept separated from high
power voltage wiring.
3.3.1 Electrical wiring
VDC
Out-RH
Control
i
Power supply voltage: 9 ÷ 30 VDC;
Current consumption: 20 mA;
Reverse polarity protection: Diode.
D The output current is normally passed through the input
resistance of the reading instrument and transformed
into a voltage that can be read by the instrument.
In order to minimize self-heating, this model of probe
uses the “switching mode” technique for controlling the
output current.
4. PROBLEMS AND MAINTENANCE
4.1 Cleaning
We recommend to clean the instrument with a slightly wet
cloth using water and not abrasive cleaners or solvents only.
Should it be necessary to remove the sensor, avoid to me-
chanical stress it and in particular avoid touching the humid-
ity sensor.
4.2 Disposal
The appliance (or the product) must be
disposed of separately in compliance
with the local standards in force on
waste disposal.
5. WARRANTY AND REPAIRS
The instrument is under warranty against manufacturing
flaws or faulty material, that are found within 18 months from
delivery date. The warranty is limited to repairs or to the
replacement of the instrument.
The eventual opening of the housing, the violation of the instru-
ment or the improper use and installation of the product will
bring about the immediate withdrawal of the warranty effects.
In the event of a faulty instrument, either within the period of
warranty, or further to its expiry, please contact our sales de-
partment to obtain authorisation for sending the instrument
to our company.
The faulty product must be shipped to Ascon Tecnologic with
a detailed description of the faults found, without any fees or
charge for Ascon Tecnologic, except in the event of alterna-
tive agreements.
6. TEHNICAL DATA
6.1 Sensor characteristics
Sensor type: CMOS-C.
6.1.1 Relative humidity
Parameter Condition Min. Typical Max. Units
Resolution 12bit 0.04 %RH
8 bit 0.7 %RH
Accuracy/
Tolerance
Typical ±3.0 %RH
Max. See figure %RH
Repeatability ±0.1 %RH
Hysteresis ±1 %RH
Non-linearity <0.1 %RH
Response time t63% 8 s
Operative range Extended 0 100 %RH
Long-term drift Normal <0.5 %RH/year

Ascon Tecnologic - TRH301 - USER MANUAL - PAG. 3
Humidity measurement tolerance
Relative humidity (%RH)
0102030405060708090 100
±0
±2
±4
±6
±8
±10
Maximum tolerance
Typical tolerance
RH (%RH)
Accuracy of temperature measurement
-40 -30-20 -10 0102030405060708090 100
0.5
1.0
1.5
2.0
2.5
±0.5°C
±0.7°C
±1.0°C
Ambient temperature (°C)
Temperature measurement
precision (±°C)
Resistance tolerance
-40 -30-20 -10 0102030405060708090 100
0.5
1.0
1.5
2.0
2.5
±0.5°C
±0.7°C
±1.0°C
Ambient temperature (°C)
Temperature measurement
precision (±°C)
6.2 Filter characteristics
6.2.1 Technical specifications
Parameter Value
Operative range -40 ÷ +125
Protction degree (1) IP67
RoHS Compliant
Body material Polybutylene terephthalate (PBT)
Body colour Black
UL94 (body material only) UL-94 V-0 (0.73 mm)
Filter material PTFE with polyester scrim
Filter colour Black
Filter thickness 0.13 mm
Filter pore size 1.5 mm
Filtration efficiency (2) 99.99%
Oleophobic Range (filter)(3) 8
Mullen Hydrostatic >100 mbar (>1 m water)
Notes: 1. IP67: dusyt tight, protected agains harmful water
immersion up to 1 m water column
(http://en.wikipwdia.org/wiki/IP67);
2. 0.1 mm particles at 0.05 m/s air flow;
3. Repellence of oil and hydrocarbons according to
AATC 118.1992 standard. Rating goes from 0 ÷ 8
while 8 is the most repellent.
6.3 Functional features
Protection degree: IP67 ((protected against dust and
against the effects of temporary immersions);
Installation method: With clip;
Electrical connections: With 2 m wire;
Dimensions (mm): L = 130 mm + spyral, Ø16 mm;
Temperature sensor: NTC 10 1% Beta 3435 1%;
Operating temperature: -30 ÷ +70°C;
Ambient humidity: 0 ÷ 100% RH;
Sensor type: CMOS;
Humidity measuring range: 0 ÷ 100% RH;
Output current (RH measurement): 4 (0%) ÷ 20mA (100%);
Load resistance: < 200W;
Response time at constant conditions (63%) at 23°C: 30 s;
Recovery time from saturation: 90 s;
Refresh: 5 s;
Storage temperature: -30 ÷ +80°C.

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