Ascon Tecnologic - TRH22 - OPERATING INSTRUCTIONS - PAG. 1
TRH22
RELATIVE HUMIDITY AND
TEMPERATURE PROBE
OPERATING INSTRUCTIONS
Vr 01 (ENG) - 19/07 - cod.: ISTR-MTRH22-ENG01
ASCON TECNOLOGIC S.r.l.
Viale Indipendenza 56, 27029 - VIGEVANO (PV) ITALY
Tel.: +39 0381 69871 - Fax: +39 0381 698730
http:\\www.ascontecnologic.com
PREFACE
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This manual contains the information necessary for
the product to be installed correctly and also instruc-
tions for its maintenance and use; we therefore recom-
mend 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
partially, 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.
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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 electromechanical devices
which will guarantee safety.
1. DESCRIPTION
1.1
General Description
The TRH 22 is a relative humidity probe (of capacitive-digital
type) and temperature (of thermistor-digital type) with normal-
ized current output signals 4 ÷ 20 mA with 4 wires (2 + 2).
1.2
Probe description
2
1
1
Sensor protective cap;
2
Cable 4 x 0.25 mm
2
.
2. INSTALLATION AND USAGE WARNINGS
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The TRH22 probe
DOES NOT WORK
when only the
temperature sensor is connected and powered. To work
properly both the probe sensors, relative humidity and
temperature, must be connected and powered.
2.1
Admitted use
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The instrument has been projected as measure trans-
ducer. It must be reminded that the user has to take
care that the electromagnetic rules are being respected also
after the instrument installing, eventually using proper filters.
2.2
Mechanical mounting
The instrument, into cylindrical case, is designed for wall
mounting by provided clip.
–
Install the instrument as far as possible from electromagnetic
sources as motors, power relay, relays, electrovalves, etc..
–
The signal cables of the device must be routed separately
from the power cables.
–
Avoid placing the probe in places where strong corrosive
and polluting gases can be present and make sure that the
probe is in an ventilated position.
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Should be necessary to remove the protective cap, do
not cause any mechanical stress to the sensor and
absolutely avoid touching the sensor surface.
2.3
Dimensions
[mm]
2.3.1
Mechanical dimensions
1500
185
20
2.4
Electrical connections
Make electrical connections according to the following
diagrams, checking that the power supply is the same as
indicated on the instrument.
The probe can be powered by the instruments to which is
connected or by an external power supply.
Check then if the measure instrument is equipped with a
voltage output 8 ÷ 24 VDC able to supply at least 20 mA,
otherwise connect the probe to a 8 ÷ 24 VDC external power
supply able to supply 40 mA and connecting it as described
following the wiring diagrams.
It is strongly recommended that cables with proper insulation,
according to the working voltages and temperatures, be used.
Furthermore, the input cable of the probes has to be kept sepa-
rate from line voltage wiring. If some cables used for the wiring
should be shielded, it is recommended to
connect the shield
to ground at one side only
.
2.5
Electrical wiring diagram
2.5.1
Wiring diagram with instrument supply
INPUT -
4 ÷ 20 mA
INPUT +
4 ÷ 20 mA
OUT V
+8 ÷ 24 VDC
+
+
GREEN
WHITE
TRH 22
YELLOW
BRO WN
Supply HUMIDITY
+ 8 ÷ 24 VDC
OUT TEMPERATURE
4 ÷ 20 mA
OUT HUMIDITY
4 ÷ 20 mA
T
V+H
V+T
RH
Supply TEMPERATURE
+8 ÷ 24 VDC
INPUT -
4 ÷ 20 mA
INPUT +
4 ÷ 20 mA
OUT V
+8 ÷ 24 VDC
Humidity probe
Temperature probe
