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AFH-G Humidity/Temperature Measuring Instrument
Brand: KOBOLD Instruments, IncThe KOBOLD type AFH-G measuring instrument serves to measure relative humidity indoors and in air ducts. Auxiliary temperature measurement is available as an option.
The moisture sensing element in the sensor comprises several strips of plastic fabric each with 90 fibres of 3 µm diameter. These plastic fibres undergo a special process to acquire hygroscopic properties, this means that they absorb and release moisture.
The molecular structure of the fibres changes when they absorb water, giving rise to a measurable change in length. The length of the plastic fibres is thus a measure of the relative humidity.
The swelling effect, acting primarily in the longitudinal direction, is sensed by an electronic pick-off system and transferred to an integrated signal preprocessing system. The output signal of the passive sensors is 100 to 138.5 Ω, and 4-20 mA for the active sensors.
The special treatment of the measuring element ensures that its hygroscopic properties remain stable, that is sensitivity is maintained until destroyed by external influence.
Regeneration found in conventional instruments is not required here, but is also not damaging. The measuring element is protected by a perforated tube and is open to the housing.
Measuring instruments with an integrated temperature sensor provide temperature measurement. The temperatures are also converted to the standardized signals 100 to 138.5 ohms and 4-20 mA.
Displaying prices & availability for Ohio, United States in CAD. Change location.
Models matching criteria: 4
- Sensor Type - Active Sensor
- Parameters - Humidity
100+ In Stock
$324.00
CAD
Does not ship to OH, United States
- Sensor Type - Passive Sensor
- Parameters - Humidity + Temperature
25+ In Stock
$2,045.00
CAD
Does not ship to OH, United States
- Sensor Type - Passive Sensor
- Parameters - Humidity
25+ In Stock
$1,172.00
CAD
Does not ship to OH, United States
- Sensor Type - Active Sensor
- Parameters - Humidity + Temperature
7 In Stock
$2,436.00
CAD
Does not ship to OH, United States
Specifications
Brand
Accuracy
- ± 2.5 % Relative Humidity at > 40 % Relative Humidity
- ± 3.5 % Relative Humidity at < 40 % Relative Humidity
- ± 0.5° C (± 0.9° F) - Temperature Measuring Accuracy
Ambient Temperature Range
- -20° to 60° C (-4° to 140° F) - Housing
- -40° to 80° C (-40° to 176° F) - Sensor
Applications
- Building Management Systems
- Exposed to Dust & Dirt
- Grain Dryers
- Greenhouses
- Monitoring Air Conditioning Systems, Drying Plant
- R & D
- Ripening Warehouses for Food
Electrical Connectors
- Conductor Cross-sections 0.5 mm - Connection Terminals
- DIN 43760 - Passive Sensors
- Self-Sealing Grommet M20 x 1.5 - Cable Connection
Enclosure, Body Material
- ABS - (Acrylnitril-Butadien-Styrol)
Environmental Protection
- IP64
Humidity
- 0 to 100 % Relative Humidity
- 30 to 100 % Relative Humidity - Operating Range
Insulation Resistance
- 10 megaohms - Passive Sensors
Linearization
- < 0.5 % - Linearity Error of Temperature Output: Active Sensor
Load Limit
- 1 W - Allowed Loading: Passive Sensors
Loop Resistance
- 100 to 138.5 ohms - Output Linear: Passive Sensors
- 500 ohms - Active Sensors: Max.
Media
- Air
- Pressureless, Non-Aggressive
Mounting
- Duct Mounting - Holes in Housing Base
- Surface Mounting - Brackets (Optional)
Mounting Position
- Horizontal
- Vertical - Sensor Pointing Down
Operating Temperature - Sensor
- -30° to 60° C (-22° to 140° F) - Active Sensors
- 5° to 80° C (41° to 176° F) - Passive Sensors
Operating Voltages
- 15-30 Vdc - Active Sensors
Output
- 4-20 mA - Active Sensors
RFI/EMI Protection
- EN 50081-2 - Emitted Interference
- EN 50082-2 - Noise Immunity
Sensor / Probe Material
- Stainless Steel
Sensor / Probe Type
- Pt100
Supply Voltage
- 42 V - Max.
Temperature Effect
- -0.1 % Relative Humidity/K -(20° C & 50 % Relative Humidity) -Average Temperature Coefficient
Version / Leadwires
- 2-Wire
- Monitoring Air Conditioning Systems, Drying Plant, Humidifiers and Dehumidifiers
- Building Management System
- Warehousing
- Ripening Warehouses for Food
- R & D (e.g. Environmental Engineering)
- In the Home
- Greenhouses
- Locations Exposed to Dust and Dirt:
- Brickworks
- Grain Dryers
- Ceramic Technology
- Tobacco Drying
