AFK-G Humidity/Temperature Measuring Instrument

Brand: KOBOLD Instruments, Inc.

The KOBOLD range AFK-G humidity/temperature sensors are sensors for measuring relative humidity and temperature (optional) in air and other non-aggressive gases for an operating temperature to 200° C.

The high pressure variant can be used up to a pressure of 25 bar. The sensors are thus ideally suited for measuring humidity in industrial processes. 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% RH. The transmitters offer a 4-20 mA Analog output for relative humidity and a second 4-20 mA output for temperature when specified.

Specifications

Accuracy

  • ± 0.3 K - Measuring Accuracy
  • ± 2 % Relative Humidity (For Range 5 to 95 % Relative Humidity & 10° to 40° C)

Ambient Temperature Range

  • -40° to 80° C (-40° to 176° F) - Transmitter

Applications

  • Bakery Technology
  • Greenhouses
  • Monitoring Air Conditioning Systems, Drying Plant, Humidifiers & Dehumidifiers
  • R & D (E.g: Environmental Engineering)
  • Ripening Warehouses for Food
  • Warehousing

Element

  • Pt 100, Category B: (According to DIN IEC 751) - Measuring Element

Environmental Protection

  • IP40
  • IP54

Humidity

  • 0 to 100 % Relative Humidity - Measuring Range

Input Power

  • 24 mA - Each Measuring Channel

Loop Resistance

  • 1,000 ohms - Maximum

Maximum System Pressure

  • psi: 362.6 (kPa: 2,500, bar: 25)

Mounting

  • Duct Mount
  • Wall Mounted

Operating Temperature

  • -25° to 125° C (-13° to 257° F)

Operating Temperature - Sensor

  • -60° to 200° C (-76° to 392° F)

Operating Voltages

  • 12-30 Vdc

Output

  • 4-20 mA - Analog Output

Response Time

  • 1 Minute: (T 90 at 1 m/sec)

RFI/EMI Protection

  • EN 50082-2 - Noise Immunity
  • EN 55011, Class B - Emitted Interference

Sensor / Probe Material

  • Stainless Steel

Temperature Range

  • -25° to 200° C (-13° to 392° F) - Measuring Range

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