- Relay Outputs
- 4-20mA, RS485 Outputs
Humidistat H3020
- 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.
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 can be optionally 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 output relay: | 220Vdc, 125Vac, 2A, 60 W, 62.5 VA |
| 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: | ±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: |
IP65 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 |
|---|---|---|---|---|---|---|
H3020
|
temperature+ humidity |
-30 to +80°C | 75mm | 2xRelay | - | Outdoor and indoor use. |
H3023
|
temperature+ humidity |
-30 to +125°C* | 150mm | 2xRelay | - | Duct mount. |
H3021
|
temperature+ humidity |
-30 to +105°C* probe incl. cable | probe cable 1,2,4m | 2xRelay | - | T+RH probe with 1m cable. Cable lengths 2m or 4m available optionally. |
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. |
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. |
* 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
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 | ||
|---|---|---|
|
SP003 | cable for humidity transmitter adjustment via USB port |
|
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 |
|
F8000 | Solar radiation shield |
|
A1515 | adapter 230V-50Hz/12Vdc |
|
accessory for calibration and adjustment of humidity by the user | |
 | Ethernet temperature, humidity, pressure sensors |  | Low cost temperature, humidity, pressure sensors |
Transmitters with 4-20mA and RS485 outputs are directly compatible with sixteen channel Comet data acquisition system MS.