Temperature, humidity, barometric pressure sensors with serial interface RS232

humidity transmitter

temperature
barometric pressure
relative humidity
dew point temperature
absolute humidity
specific humidity
mixing ratio
specific enthalpy

Measured temperature, relative humidity, barometric pressure are converted to digital serial output with RS232 link parameters. Transmitters are available in wall-mount, duct-mount and bar types. Also types with T+RH probe on a cable are available. Model T3319P is designed for compressed air measurement up to 25 bars.
Large dual line LCD for display of temperature, humidity, pressure or other calculated humidity interpretation is an advantage. Computerized design ensures maximum long term stability and fail indication. The transmitter works with ModBus RTU communication protocol or with Advantech ADAM compatible protocol. Protocol is user selectable in special configuration mode by means of the PC. Serial link enables to read actual readings and modify transmitter configuration. Instrument works always in slave mode, i.e. responds only to master device query.
The Tx31x RS232 transmitters can be powered directly from the COM port of the PC or from external ac/dc adapter.

Ask more information on availability of other communication protocols.

State-of-the-art capacitive polymer humidity sensor excels in mechanical stress, temperature shock, dew resistance as well as in large linearity range and low hysteresis. Transmitters are designed for use in non-aggressive environment.

APPLICATIONS - measuring of temperature, humidity, pressure at:

building HVAC management
building HVAC automation
warehouses
glasshouses
manufacturers
museums, archives, galleries
air-conditioned rooms
weather stations

COMMON TECHNICAL PARAMETERS
Supported temperature units:	degrees Celsius, degrees Fahrenheit
Temperature sensor:	RTD Pt1000-3850ppm/°C
Operating temperature range of the case with electronics:	-30 to +80°C, recommended to switch OFF LCD display over +70°C
Accuracy:	±0.4°C
Measuring relative humidity range:	0 to 100%
Accuracy:	±2.5% RH from 5 to 95% at 23°C
Accuracy and range of dew point temperature output: - for more details see graphs	±1,5°C at ambient temperature T<25°C and RH>30% range -60 to +80 °C
Accuracy and range of absolute humidity output:	±3g/m3 at ambient temperature T < 40°C range 0 to 400 g/m3
Accuracy and range of specific humidity output:	±2g/kg at ambient temperature T < 35°C range 0 to 550 g/kg
Accuracy and range of mixing ratio output:	±2g/kg at ambient temperature T < 35°C range 0 to 995 g/kg
Accuracy and range of specific enthalpy output:	±3kJ/kg at ambient temperature T < 25°C range: 0 to 995 kJ/kg
Accuracy and range of barometric pressure output:	± 1.3hPa at 23°C range: 600 to 1100hPa
Supported pressure units:	hPa, kPa, mbar, mmHg, inHg, inH2O, PSI, oz/in^2
Temperature compensation of the humidity sensor:	from -30 to +125°C
Power:	9 to 30 V DC, current consumption approximately 6mA
Protection - temperature and humidity transmitters:	IP65 electronics with terminals, IP40 humidity and temperature sensors
Protection - transmitters measuring pressure:	IP54 electronics with terminals, IP40 humidity and temperature sensors
Filtering ability of sensor cover:	0.025mm - filter from stainless steel mesh
Communication protocol:	ModBus RTU and Advantech ADAM compatible protocol Description of communication protocols in pdf format
Communication speed:	110 to 115200 Bd
Warranty:	two years

TRANSMITTER MODELS
- communication circuits are GALVANICALLY CONNECTED with power circuitry
Type	Measured value	Description	Manual in pdf format
T4311	temperature	Temperature transduser for RTD sensors Pt1000 outdoor and indoor use maximum range of temperature measurement -200 to +600°C
T0310	temperature	Thermometer outdoor and indoor use stem length 53mm maximum range of temperature measurement -30 to +80°C
T3311	temperature humidity	Thermometer-hygrometer outdoor and indoor use stem length 75mm maximum range of temperature measurement -30 to +80°C dimensions
T3313	temperature humidity	Thermometer-hygrometer duct mount stainless steel stem length 150mm maximum range of temperature measurement -30 to +125°C dimensions
T3319	temperature humidity	Thermometer-hygrometer T+RH probe with 1 m cable. Available also with probe cable lengths 2m or 4m. maximum range of temperature measurement -30 to +105°C* probe including cable
New ! T3319P	temperature humidity	Thermometer-hygrometer T+RH probe from hard anodized duralumin with 1 m cable for compressed air up to 25 bars. Available also with probe cable lengths 2m or 4m. Maximum range of temperature measurement -30 to +105°C* probe including cable.
T7310	temperature humidity barometric pressure	Thermometer-hygrometer-barometer outdoor and indoor use stem length 75mm Barometer enables to measure sea level pressure by setting of correction to altitude above sea level. maximum range of temperature measurement -30 to +80°C dimensions
T7311	temperature humidity barometric pressure	Thermometer-hygrometer-barometer T+RH probe with 1 m cable. Available also with probe cable lengths 2m or 4m. Pressure sensor is located in the control unit with display. Barometer enables to measure sea level pressure by setting of correction to altitude above sea level. maximum range of temperature measurement -30 to +105°C* probe including cable
T2314	barometric pressure	Barometer Barometer enables to measure sea level pressure by setting of correction to altitude above sea level.

Description of communication protocols in pdf format

Description of calibration and adjustment procedure in pdf format

* Maximum temperature only at the measuring end with sensors. Relative humidity at temperature over +85°C is limited in accordance with the graph. Near plastic case with electronics maximum temperature is +80°C.

Figure: Working range of humidity probe

Figure:
T3319P humidity probe for compressed air up to 25 bars
- hard anodized duralumin, stainless steel mesh filter moulded in polycarbonate

measuring chamber
Figure: Flow chamber SH-PP for compressed air measurement up to 25 bars - stainless steel

Included accessory:

Traceable calibration certificate from the manufacturer, instruction manual. Calibration certificate with declared metrological traceability of etalons is based on requirements of EN ISO/IEC 17025 standard.
Example of calibration certificate.

TSensor - freeware for online configuring of the transmitter is ready to download.

SensorReader - freeware for online logging values from one transmitter to a PC disk file is ready to download. Program enables to alarm acoustically the PC user if adjusted alarm limits are exceeded. Recorded values in CSV format are easy to process in e.g. Excel. Program can be started several times on a computer at the same time to monitor values from several transmitters.

For online acquiring values from several transmitters, third party software is necessary to use. Tested functionality is with programs:

For acquiring values from several transmitters, third party software is necessary to use. Tested functionality is with programs:

LabVIEW from National Instruments, by means of the free Modbus Library for LabVIEW. For viewing of actual values and graphs from Tx31x transmitters following example of application was created in LabVIEW 8.5 : RS232-485.vi

TIRS.NET - transmitters are also directly supported by program TIRS.NET from Coral s.r.o. company. Please download demo enabling full work with transmitters.

Tested functionality is also with programs:
ControlWeb, EasyView.

Transmitters Tx31x with the RS232 output have included 1.6 meter cable for communication with RS232 computer port. The Tx31x RS232 transmitters can be powered directly from the COM port of the PC by means of the included communication cable or from external ac/dc adapter.

OPTIONAL ACCESSORY
	MP006	RS232/USB converter for connection of Tx31x transmitters to the PC via USB port
	TxxxxL	Transmitter version with watertight male connector IP67 Lumberg RSFM4 instead of cable gland for easy connection/disconnection of the output. Specify please your order with letter L behind model code (e.g. TxxxxL). Minimum order of 10 pieces.
	K1427	Female connector ELKA 4012PG7 for TxxxxL transmitters with male connector Lumberg for easy connection/disconnection of the output. Cable is easily connected to screw terminals of the connector. IP67 protection.
		Transmitter version with blind lid without LCD. Specify please the requirement in your order.
	F5200	grey sensor cover with filter from stainless steel mesh, filtering ability 0,025mm
	F5200B	black sensor cover with filter from stainless steel mesh, filtering ability 0,025mm
	F0000	sintered bronze sensor cover. Filtering ability 0.025mm.
	PP4	flat plastic circular flange for duct mounting
	PP90	right-angled stain-less steel flange for wall mounting
	SP004	plastic gland for direct mounting of the humidity probe to a 29 mm diameter hole
	MD036	self adhesive Dual Lock for easy installation
	SP006	Tool for easy wire connection to terminals
	F8000	Solar radiation shield for transmitters T7311 with T+RH probe on a cable
	SH-PP	Flow chamber for compressed air measurement up to 25 bars - stainless steel DIN 1.4301 inlet and outlet connection - G1/8 thread humidity probe connection - G1/2 thread screw-coupling not included
	A1510	ac/dc adapter 100 to 240Vac/12Vdc
		accessory for calibration and adjustment of humidity transmitter by the user