Temperature, Humidity, Pressure Regulators with Relay and RS485 Outputs

humidistat photo

Humidistat H3430, H7430

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

Humidistats are designed for two-state control of e.g. heating, ventilation, humidifier, dehumidifier, etc.
Transmitter is equipped with two relay outputs for alarm indication or control of external devices. Each relay can be assigned to any measured or computed value. For each relay setting of delay, hysteresis, audible alarm is enabled.
Measured values are converted to galvanically isolated RS485 serial output.
Fully equipped transmitter contains temperature, humidity, pressure sensors.
Measured temperature and relative humidity is recalculated to other humidity interpretations - dew point temperature, absolute humidity, specific humidity, mixing ratio or specific enthalpy.
Reading and pressure output are available in these units: hPa, kPa, mbar, mmHg, inHg, inH2O, PSI, oz/in2. Degrees Celsius and Fahrenheit are user selectable.
Parameters are easy adjustable from regulator keyboard or from the computer. Large dual line LCD for simultaneous display of temperature, pressure or relative humidity or other calculated humidity interpretation is an advantage.
State-of-the-art capacitive polymer sensor ensures excellent calibration long term stability, inertia against water and condensation. Transmitter is designed for use in non-aggressive environment.
Transmitter is also equipped with three binary inputs for detection of two-state events - e.g. water, smoke, glass break detection, door contact.

HUMIDISTAT APPLICATIONS

- temperature and humidity control
- monitoring of temperature, humidity, pressure and three binary signals at:

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

COMMON TECHNICAL PARAMETERS
Maximum switching voltage, current, power of relay output:	50V, 2A, 60VA
Audible alarm:	from built-in beeper - switchable
Supported temperature units:	degrees Celsius, degrees Fahrenheit
Accuracy of temperature measurement:	±0.4°C from -30 to +100°C, ±0.4% from reading over +100°C
Range of relative humidity measurement:	0 to 100%
Accuracy of relative humidity measurement:	±2.5% relative humidity from 5 to 95% at 23°C
Accuracy of temperature measurement:	±0.4°C from -30 to +100°C ±0.4% from reading over +100°C
Accuracy and measuring range of dew-point temperature: - for more details see graphs	±1,5 °C at ambient temperature T < 25°C and RH>30% range -60 to +80 °C
Accuracy and measuring range of absolute humidity:	±3g/m3 at ambient temperature T < 40°C range 0 to 400 g/m3
Accuracy and measuring range of specific humidity:	±2g/kg at ambient temperature T < 35°C range 0 to 550 g/kg
Accuracy and measuring range of mixing ratio:	±2g/kg at ambient temperature T < 35°C range 0 to 995 g/kg
Accuracy and measuring range of specific enthalpy:	± 3kJ/kg at ambient temperature T < 25°C range: 0 to 995 kJ/kg
Operating temperature range of the case with electronics:	-30 to +80°C
Operating temperature range of LCD display:	readable up to operating temperature +70°C, it is recommended to switch off LCD over +70°C
Range of temperature compensation of RH sensor:	-30 to +125°C
Signal for binary inputs:	from voltage-less contact, open collector or two-state voltage signal. Inputs are not galvanically isolated.
Minimum pulse length at binary input:	500 ms (shorter pulse may not be detected)
Voltage at open contact:	3.3 V
Low voltage level:	0 to +0.2 V
High voltage level:	+3.0 to +30V
Filtering ability of sensor cover:	0.025mm - filter from stainless steel mesh
Protection - temperature and humidity transmitters:	IP65 electronics with terminals, IP40 humidity sensors
Protection - transmitters measuring pressure:	IP54 electronics with terminals, IP40 humidity and temperature sensors
Power:	9-30Vdc
Dimensions of the case:	135 x 136 x 45 mm (W x H x D)
Warranty:	2 years

Humidistats are available in the following models:

Model	Measured value	Maximum measuring ranges	Stem length	Output	Other output	Description
H0430	temperature+ 3binary inputs	-30 to +80°C	53mm	2xRelay	RS485	Ambient temperature thermostat. Outdoor indoor.
H4431	temperature+ 3binary inputs	-200 to +600°C	-	2xRelay	RS485	Temperature transducer for RTD Pt1000probes (not included). Accuracy of the input without probe +/-0,2°C
H3430	temperature+ humidity+ 3binary inputs	-30 to +80°C	75mm	2xRelay	RS485	Outdoor, indoor.
H3431	temperature+ humidity+ 3binary inputs	-30 to +105°C* probe incl. cable	probe cable 1,2,4m	2xRelay	RS485	T+RH probe with 1m cable. Cable lengths 2m or 4m available optionally.
H3431P	temperature+ humidity+ 3binary inputs	-30 to +105°C* probe incl. cable compressed air up to 25 bars	probe cable 1,2,4m	2xRelay	RS485	Thermometer-hygrometer. T+RH probe from hard anodized duralumin with 1m cable. Cable lengths 2m or 4m available optionally.
H3433	temperature+ humidity+ 3binary inputs	-30 to +125°C*	150mm	2xRelay	RS485	Duct mount.
H7430	temperature+ humidity+ atm.pressure+ 3binary inputs	-30 to +80°C	75mm	2xRelay	RS485	Outdoor, indoor. Reading and pressure output in these units: hPa, kPa, mbar, mmHg, inHg, inH2O, PSI, oz/in^2. Barometer enables to measure sea level pressure by setting of correction to altitude above sea level.
H7431	temperature+ humidity+ atm.pressure+ 3binary inputs	-30 to +105°C* probe incl. cable	probe cable 1,2,4m	2xRelay	RS485	T+RH probe with 1m cable. Cable lengths 2m or 4m available optionally. Pressure sensor is located in the control unit with display. Reading and pressure output in these units: hPa, kPa, mbar, mmHg, inHg, inH2O, PSI, oz/in^2. Barometer enables to measure sea level pressure by setting of correction to altitude above sea level.

Manual in pdf

Description of communication protocol in pdf

* Relative humidity at temperature over +85°C is limited in accordance with the graph. Near plastic case with electronics and probe cable maximum temperature is +80°C.

Figure: Humidistat working range

Figure: H3431P 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

Serial output RS485 is galvanically isolated from other circuitry to prevent collisions on the RS485 bus. 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. Transmitters have the address space available from 0 to 255. Communication speed is 110 to 115200Bd.

Free program SensorReader for logging values from one transmitter via RS485 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.

Included accessories:

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.

Free program TSensor for configuring of the transmitter is ready to download.

For acquiring values from several transmitters connected to RS485 bus, third party software is necessary to use. Tested functionality is with programs:

LabVIEW from National Instruments, TIRS.NET, ControlWeb, EasyView.

HUMIDISTAT OPTIONAL ACCESSORY
	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
	A1510	adapter 230V-50Hz/12Vdc
	F8000	Solar radiation shield for transmitters H3431, H7431 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
		accessory for calibration and adjustment of humidity by the user