PST-T7411

Programmable humidity transmitters - Serial interface

Temperature
Barometric pressure
Relative humidity
Dew point temperature
Absolute humidity
Specific humidity
Mixing ratio
Specific enthalpy

Measured temperature, barometric pressure, relative humidity, dew point temperature, absolute humidity, specific humidity, mixing ratio or specific enthalpy is converted to digital serial output with the RS485 or RS232 link parameters. Large dual line LCD for simultaneous display of temperature and relative humidity, or other calculated humidity interpretation is an advantage. Computerized design ensures maximum long term stability and fail indication. The transmitter works with ModBus 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. Transmitters have the address space available from 1 to 255. The T4311 RS232 transmitter can be powered directly from the PC port or from external ac/dc adapter.

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 and control of air humidity at:

Warehouses
Glasshouses
Manufacturers
Museums, archives, galleries
Air-conditioned rooms
Weather stations

Common Specifications
Supported temperature units	Celsius and Fahrenheit
Temperature sensor	RTD Pt1000-3850ppm/°C
Measuring temperature range of the case with electronics	-30 to +70°C, with switched OFF LCD display up to +80°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	±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	-30 to +125°C
Power	9 to 30 V DC, power consumption approximately 0.5W
Protection - temperature and humidity transmitters	IP65 electronics with terminals, IP40 humidity sensor
Protection - transmitters measuring pressure	IP54 electronics with terminals, IP40 humidity sensor
Filtering ability of sensor cover	0.025mm
Communication protocol	ModBus and Advantech ADAM compatible protocol Description of communication protocols in PDF format Description of calibration and adjustment procedure in PDF format
Communication speed	110 to 115200 Baud
Warranty	Two years

* 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.

PST-T7411

Measured values

RH, temp and barometric pressure

Description

Thermometer-hygrometer-barometer with RS485 output

RH&T probe with 1 m cable
Available also with probe cable lengths 2m or 4m
Maximum temperature range -30 to +105°C*

Working range of humidity probe

Inclusions

Calibration certificate from the manufacturer
Instruction manual
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.

Datasheet

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