LAE electronic HT2W Serie Mode D'emploi page 4

INSTRUCTIONS FOR INSTALLATION AND USE
HT2W
The HT2W transmitters feature fast humidity measurement up to 100% r.H. and long-lasting, constant precision thanks to meticulously
selected materials.
Please read the following instructions carefully for correct performance of this product.
INSTALLATION
Fix the plate to the panel using 2 cheese-headed screws with 4 or 5 mm diameter and then apply the instrument casing to the plate.
This should be done for vertical panels and for correct positioning of the instrument with the outlets at the bottom.
The HT2W should operate with a room temperature between 0 and 50°C inclusive. Do not install near to sources of heat or near
power conductors in order to reduce the effect of electromagnetic disturbance.
The connection between the HT2W and the associated instrument should not be longer than 4 metres.
Take all precautions for devices sensitive to electrostatic charges when installing, operating and cleaning the transmitter.
The filter may be removed by unscrewing the cap; the filter and cap should be washed with soapy water. Do not touch the sensor.
In the version with digital output, connect the output to the RS485 line, making sure you respect the polarity (indications A, B). The
RS485 serial port allows the instrument to be part of a network, typically a PC, and provides all monitored humidity and temperature
data. You must assign a unique Addr address for each linked instrument. When you buy a HT2W, this is set with Addr=1.
The serial communication protocol is the "Modicon Modbus" in ASCII mode, with the following settings:
Baudrate = 9600, data bits = 7, stop bit = 1, parity = even. The implemented functions are: "03" and "06" for respectively writing
and reading of a single register.
The table below reports the features of the main registers. We recommend you to perform the writing operations to the addresses here
below exclusively, else you would compromise the correct instrument operation.
Description Register address
Temperature
Humidity
Addr. 200
COMPATIBILITY WITH CHEMICAL AGENTS
The sensor has a good tolerance to chemical agents, but certain substances such as acetone, propane and sulphuric acid could destroy
the sensor.
CALIBRATION
Calibration should be carried out in environments with perfectly stable humidity and temperature. Use a sample instrument placed near
the instrument to be calibrated; wait for the reading to become stable and adjust the trimmer P1 (P3 for HT2WSE) until the measured
values coincide.
SPECIFICATIONS
Size
Operating temperature
Range
Precision in humidity measurement
Precision in temperature measurement
Resolution humidity
Resolution temperature
Response time
Type of sensor
Signal output
Connections
Power supply
Consumption
Front protection
Resolution
0 0.1
1 0.1
1
HT2WAD
+/- 5 r.H.% (25...75% r.H.)
-
-
-
Capacitive
0...1V
12Vdc given by the meter
0.2W
Type
Integer (R)
Integer (R)
Character (R/W)
HT2WSE
110x75x53 mm (WxHxD)
0...+50°C
0...100% r.H.
+/- 0.3°C @ 25°C, +/- 1.0° 0...70°C
0.1 r.H.%
0.1 °C
2 minutes
capacitive + thermistor
RS485 protocol MODBUS
terminal block
230Vac
IP65
0LHT2W002EN
Standard value
-
-
1
WARRANTY
LAE electronic Srl guarantees its
products against defects due to faulty
materials or workmanship for one (1)
year from the date of manufacture
shown on the container. The Company
shall only repair or replace products
which are shown to be defective to the
satisfaction of its own technical services.
The Company shall not be under any
liability and gives no warranty in the
event of defects due to exceptional
conditions of use, misuse or tampering.
All carriage expenses for returning the
product to the manufacturer, after
having obtained the latter's permission,
2W
and for any return to the buyer shall be
paid by the buyer.