SIAP+MICROS t003 TRH Guide

t003 TRH
Air Relative Humidity Transducer
User Manual and maintenance

User manual and maintenance
t003-di TRH.docx
26/10/2023 2Vers.: 1.0
Summary
1Introduction ................................................................................................................................................ 3
2Technical specifications ............................................................................................................................. 4
2.1 Operation scheme ............................................................................................................................. 5
3Installation and maintenance ..................................................................................................................... 6
3.1 Installation.......................................................................................................................................... 6
3.2 Maintanance ...................................................................................................................................... 6
4Electrical connection .................................................................................................................................. 7
4.1 Connector output ............................................................................................................................... 7
4.2 Connection cable ............................................................................................................................... 7
4.3 Read serial data (RS485 Modbus e SDI-12) ..................................................................................... 7
4.3.1 RS485 Modbus ode ....................................................................................................................... 8
4.3.2 SDI-12 mode.................................................................................................................................. 8
5Generic information ................................................................................................................................... 9
5.1 Safety................................................................................................................................................. 9
5.2 Appropriate use of the equipment ................................................................................................... 10
5.3 Storage ............................................................................................................................................ 10
5.4 Moving ............................................................................................................................................. 10
5.5 Disposal information ........................................................................................................................ 10
6Revision history ........................................................................................................................................11

User manual and maintenance
t003-di TRH.docx
26/10/2023 3Vers.: 1.0
1Introduction
TRH provides accurate and reliable measurements of relative air humidity. The sensing component features a
laser-cut polymer capacitive transducer with an integrated signal conditioning system on an electronic board.
The sensitive element is inserted in a filtering structure which offers excellent resistance even in critical
operating conditions due to the presence of water, dust, dirt, oil or chemical products. This expedient makes
the sensitive element more immune to aging and, consequently, to reconditioning and calibration. The
generously sized protective screen is made of non-hygroscopic and UV-rays stabilized plastic material which
reproduces an ideal measurement environment, ventilated and protected from sunlight. The sensor is supplied
with power and signal cable (4 m).
Ordering codes:
Current output:.........................................................t003a-TRH-I
Tension output: ........................................................t003b-TRH-V
RS485 Modbus serial output: ..................................t003c-TRH-S
SDI-12 serial output: ................................................t003h-TRH-12

User manual and maintenance
t003-di TRH.docx
26/10/2023 4Vers.: 1.0
2Technical specifications
Measurement performance
Transducer
Capacitivo
Measurement range
0 ÷ 100 °C
Accuracy (with temperature -20 ÷ +60 °C)
±2
Resolution
0.01
Operating conditions
Temperature
-30 ÷ +60 °C
Humidity
0 ÷ 100 RH%
Outputs
Current
4 ÷ 20 mA ↔0% ÷ 100 %
Tension
0 ÷ 1 V ↔-0% ÷ 100%
RS485 MODBUS
Relative Umidity
SDI-12
Relative Umidity
Power supply and Consumption
Voltage supply
7 ÷ 30 Vdc
Power consumption
Min
Typical
Max
4 ÷ 20 mA
5
25
0 ÷2 V / RS485 MODBUS / SDI-12
1
3
Mechanical specifications
Protective body
Plastic material (ASA) and stainless-steel
screws
Electrical connections
4 male poles IP67

User manual and maintenance
t003-di TRH.docx
26/10/2023 5Vers.: 1.0
Dimension:
H1 – maximum height: ~ 330 mm
H2 - radiation shield height: 190 mm
D1 – maximum diameter: 180 mm
D2 – fixing diameter: 40 mm
Element:
A – internal sensitive element
B – radiation shield in ASA
C – fixing points on the sensor shaft
D – sensor shaft in PVC
Weight: 1,2 kg
2.1 Operation scheme
The internal sensitive element is a 4-wire Pt100 inserted in a stainless-steel body positioned in the center of
the radiation shield. In the natural version the output is brought directly to the output connector. In the other
versions, an electronic interface shows the other different types of output on the connector.

User manual and maintenance
t003-di TRH.docx
26/10/2023 6Vers.: 1.0
3Installation and maintenance
3.1 Installation
The sensor must be installed on special
brackets which distance it sufficiently from
reflected heat sources (for example the
same support pole of the station) which
could influence its correct measurement.
For correct installation, the sensor should
be placed at a distance from the closest
obstacle (pylons, trees, buildings) equal to
10 times the height of the obstacle itself, this
to minimize the effects of alteration of the
normal air flow.
The sensor must be fixed to the plastic stem
with jumpers or similar elements having a diameter of 40mm.
Normally, according to WMO standards, the installation height of the sensor must be between 1.25 and 2
meters.
3.2 Maintanance
The device does not require any particular maintenance, other
than periodic cleaning of the protection shelter (Radiation
Shield) in order to keep it clean of dirt that could obstruct the
normal natural ventilation of the sensor, reducing the correct
measurement of the air temperature.
To clean the shelter, remove the 3 covers of the fixing screws
see (1) figure, unscrew the 3 screws (2) with the washers (3)
and remove it from the sensor body. Clean it with water and a
non-aggressive detergent and a normal non-abrasive sponge
(to avoid damaging the surface by scratching it).
For constant measurement verification over time, it is advisable
to periodically check the sensor in the factory by comparing it
with standard reference instruments.

User manual and maintenance
t003-di TRH.docx
26/10/2023 7Vers.: 1.0
4Electrical connection
4.1 Connector output
Pin
I / V / S / SDI12
output
1
Vcc
2
+4÷20 mA
+0÷2 Vdc
B-RS485
SDI-12 (data)
3
-4÷20 mA
-0÷2 Vdc
A-RS485
n.c.
4
GND
4.2 Connection cable
The connection cable supplied with the sensor is made with circular connectors with housing, 4x24 AWG
shielded cable and ferrules for connection to the data logger terminals. The sock is connected to the black
cable.
Pin
1
2
3
4
Cable
Red
White
Green
Black+Shield
Signal
Vcc
(alim.)
+4÷20 mA
+0÷2 Vdc
B-RS485
SDI-12 (data)
-4÷20 mA
-0÷2 Vdc
A-RS485
n.c.
GND
(alim.)
4.3 Read serial data (RS485 Modbus e SDI-12)
Sensors with RS485 Modbus or SDI-12 output send data only upon specific request from the PC, data logger
or PLC.
The correct communication parameters of the device performing the interrogation are shown below.
Calza / Shield

User manual and maintenance
t003-di TRH.docx
26/10/2023 8Vers.: 1.0
4.3.1 RS485 Modbus ode
Serial port settings: 9600 baud, no parity, 8 data bit, 1 bit di stop
Compatible with ModBus RTU protocol, functions supported: “03 – read Holding Registers” e “04 – Read Input
Registers”.
Data type: “2 registers swapped float IEEE 754 in the form CDAB where A is the most significant byte of the
float and D is the less significant byte of the float (swapped float)”.
ID
Registers
Units
Reg. 1-2
Reg. 3-4
Reg. 5-6
Reg. 7-8
Reg. 9-10
Reg. 11-12
Reg. 13-14
4
0
%
Reltive
Humidity
-
-
-
-
Diagnostic
Supply Voltage
4.3.2 SDI-12 mode
Serial port settings: 1200 baud, even parity, 7 data bits, 1 stop bit
Supported commands (a = 3, sensor address)
?! Address Query
aI! Send Identification
aM! Start Measurement
aC! Start Concurrent Measurement
aD0! Send Data
a
Position
Units
Decimals
Position 1
Position 2
Position
3
Position 4
Position 5
Position 6
Position
7
3
1
%
0
Reltive
Humidity
Diagnostic
Supply
Voltage
-
-
-
-

User manual and maintenance
t003-di TRH.docx
26/10/2023 9Vers.: 1.0
5Generic information
The qualitative level of our instruments is the result of a continuous evolution of the product. This may cause
differences between what is reported in the manual and the instrument you have purchased.
Siap+Micros S.p.A. reserves the right to modify without notice technical specifications and dimensions to adapt
them to the needs of the product.
5.1 Safety
Please read these safety instructions carefully before using this product:
•The warranty will be void if the product is used differently from the instructions described in this manual.
•Any sign of tampering will void the warranty
•Use the devices only according to the instructions (environmental management, operation, wiring,
installation, etc.) provided in this manual
•The correct and safe operation of the device can only be guaranteed if the transport, storage, operation
and management of the device are compliant. This also applies to product maintenance.
•The device shall not be exposed to aggressive chemicals or solvents that could damage the plastic
casing and/or corrode the metal parts.
•Maintenance should only be performed by qualified and well trained personnel.
It is appropriate to carry out a careful risk assessment in relation to the context of installation and use of the
device by the installer considering the possible meteorological station in its complexity without being limited to
the sensor.
The instruments must be installed according to the rules of the trade, with equipment that complies with
applicable regulations and using supports correctly sized by qualified technicians and designed for the specific
purpose.
During installation operations, check the suitability of the surrounding environment and compliance with local
safety regulations.
The manufacturer declines all responsibility in case of failure due to negligence of the instructions, tampering,
uses not described in this manual, improper use, use by operators not trained.
Read the instructions and intended use carefully and be sure you understand before installing the device
Before starting the activities, check the integrity of the instrument to be installed, prepare the equipment
necessary for the work and wear the necessary PPE.
Take adequate measures to prevent the access of foreign personnel (untrained and uninformed) during the
installation, maintenance or replacement of the instrument.
Take precautions to avoid falling objects, both during the installation phases and during the operation of the
instrument.
Do not perform any activity in bad weather conditions.

User manual and maintenance
t003-di TRH.docx
26/10/2023 10 Vers.: 1.0
During maintenance, particularly if the station is not frequented, visually check for the absence of dangerous
insects and, if not, use suitable insecticides.
Consider the presence of any animals near the station, if so, pay attention to them.
Use only SIAP+MICROS original spare parts.
The instrument is not classified suitable (according to Directive 2014/34/EU) for use in atmospheres with
potential explosion risk pursuant to Directive 99/92/EC.
SIAP+MICROS strives to minimize health and safety risks in all phases of the instrument's life, including
installation, use, maintenance, decommissioning and disposal.
5.2 Appropriate use of the equipment
Use the instrument for its intended purpose, do not use it for any other purpose or cause malfunctions and/or
damage.
5.3 Storage
If you do not plan to use the equipment for an extended period of time (at least one year) disconnect all cables
from the equipment, place it in a clear plastic bag along with a bag of desiccant salts and seal the bag with
tape. Put appropriate indication on the bag of the contents and weight of the equipment by inserting the wording
"HANDLE WITH CARE".
Store the instrument in an environment with a temperature between 0°C and 60°C with a humidity not
exceeding 80%. Make sure that the instrument is stored in a stable position and that it cannot be damaged or
moved by inexperience or carelessness. Do not stack other tools or weights. Do not place the instrument on
top of other instruments and in any case ensure the solidity and stability of the underlying support.
Non esporre, stoccare lo strumento in ambienti con presenza di vapori e/o gas corrosivi.
5.4 Moving
In order to avoid any damage to the device during transportation, please keep it in upright position without
shaking.
5.5 Disposal information
Electrical and electronic equipment marked with specific symbol in compliance with 2012/19/EU
Directive must be disposed of separately from household waste. European users can hand them
over to the dealer or to the manufacturer when purchasing a new electrical and electronic
equipment, or to a WEEE collection point designated by local authorities. Illegal disposal is
punished by l.
Disposing of electrical and electronic equipment separately from normal waste helps to preserve natural
resources and allows materials to be recycled in an environmentally friendly way without risks to human health.

User manual and maintenance
t003-di TRH.docx
26/10/2023 11 Vers.: 1.0
6Revision history
The following table shows the description of the changes made to this document.
Version
Date
Updates
1.0
05/06/2023
Current version of the document.
All the information content in this document are the current available at the printing phase. Siap+Micros S.p.A. reserve the rights to change
the specifications without any advance notice