Thermohygrometers
–
User manual
LSI LASTEM SRL
INSTUM_04246
Pag. 11 / 17
3.3
LSI LASTEM data logger configuration
If the sensor is used with an LSI LASTEM data logger, proceed with the configuration of the data logger using
the 3DOM software:
➢
Open the data logger configuration
➢
Add the sensor by selecting its code (eg DMA672.1) from the
3DOM Sensor Library
.
➢
Check the acquisition parameters (input, rate, etc.)
➢
Save the configuration and send it to the data logger.
For more information about the configuration, refer to the manual of the data logger in use.
4
Operation check
To check the sensor output it is necessary to have the accompanying drawing (DISACC) of the sensor and a
multimeter.
Identify the sensor output (§2). For sensors with analog output (current or voltage), proceed as follows:
➢
Current output (0/4÷20 mA):
1.
Set the multimeter to measure signals in direct current (DC) and 20 mA scale.
2.
Disconnect the wire corresponding to the negative signal (- Sig) and connect it to the red test
lead (+) of the multimeter. The black test lead (-) fix it in place of the disconnected wire.
3.
Read the value displayed on the multimeter and apply the formula shown in §4.1.
➢
Voltage output (V):
1.
Set the multimeter to measure voltage signals and scale in V.
2.
Connect the red test lead (+) of the multimeter to the wire corresponding to the positive
signal (+ Sig) and the black test lead (-) to the negative signal wire (- Sig) of the sensor (it is
not necessary to disconnect the sensor from the data logger.)
3.
Read the value displayed on the multimeter and apply the formula shown in §4.1.
Verification of the digital output (RS485) can be done using a PC, equipped with an RS232 serial port and in
which the third-party program
modpoll
https://www.modbusdriver.com/modpoll.html
) is installed.
1.
Connect the sensor serial cable to the PC serial port.
2.
Open a DOS Prompt window and type the following command (it is assumed that the transmission
parameters are set as follows:
Baudrate: 9600 bps
,
Parity: None
and that the PC serial port used is
COM1):
modpoll -a 1 -r 1 -c 3 -t34:float -p none -b 9600 com1
[Enter]
For the list of available commands, type the command
modpoll /help
.
3.
The program displays the values for the following quantities:
Temperature, Relative Humidity, Dew Point.
For more information about the DMA975 sensor, refer to
INSTUM_01371
user manual.
