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Analoque Output AFA-G

Capacitive method of measurement

Operating range: 0 ... 100% rH
Accuracy: ± 2% rH (5 ... 95% rH & 10 ... 40°C )
pmax: pressureless
tmax: 0 ... 60°C
Output: 4 ... 20 mA
Option: limit switch, plug-on display, wall mounting set

Description :

Type KOBOLD AFA-G humidity sensors are suited for measuring relative humidity in air or in other non-aggressive gases. The sensors are based on capacitive metrology which is reasonably-priced, maintenance-free and highly accurate. Capacitive humidity sensor elements form the basis of these sensors. An electrode system, a moisture-sensitive polymer  layer and a gold layer that is permeable to vapour are situated on a small thin glass or ceramic substrate.

Since the hygroscopic polymer layer can absorb water molecules that alter its dielectric constant, this layered system acts as a moisture-dependant capacitor, whose capacitance is a measure of the surrounding relative humidity. The change in capacitance is converted to an electrical output signal by electronics normally mounted on the humidity sensor element. Both parts form a capacitive humidity sensor that can be adjusted using humidity references. Accuracy is approximately ±2%.

Besides providing the output signal of 4... 20 mA, the measuring instrument allows the measured value to be read off a red LED display at the measuring point. The display is supplied from the 4... 20 mA signal current and thus requires no additional power supply. The measuring instruments are also available with a programmable switching output. Sensors from the range are delivered with an aluminium sensor unit and a gauze filter. The connection is made with a right-angle plug according to DIN 43650.

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Hand-Held Humidity Precision Measuring Unit HND-F

for weight moisture or relative humidity
Measuring range: 0 - 100 % rH
Accuracy: ±0.1 / 0.2 % rH
Supply: 9 V battery
Hold function, Min/Max-memory, alarm,
data logger, output 0 - 1 V, RS 232
Option: temperature measuring, flow measuring

Description 

Nearly all measuring tasks for the determination of weight and gas moisture can be performed with the HND-F series KOBOLD hand-held humidity measuring units. Various housing designs make it possible to find the right housing with the appropriate characteristic for every application. In addition to the large selection of humidity sensors for weight and gas moisture, measuring probes are also available for measuring air and water flow.

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Humidity Annex Switch AFS-G3

Measuring Range 

Operating range: 50 - 100 % rH
pmax: pressureless
Max. temperature: 0 ... 60°C
Accuracy: ±3 % rH
Contact: 1 micro switch, adjustable from inside

Description 

The humidity annex switch of type AFS-G3 serves to monitor condensed water formation. The hygro module of the measuring instrument is arranged on an aluminium baseplate so that the measuring element is near the mounting plate. Protected by the housing relative humidity near the dew point can form inside.

The aluminium baseplate is adjacent to the cooling tube and conducts heat from the measuring element. The measuring point can be set inside. The threshold should be adapted for local conditions. The microswitch switches a potential-free changeover contact. The AFS requires no supply voltage.

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