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FHA 646 R-english

Product catalog summary

Overview: The document describes a compact air humidity sensor with small dimensions, suitable for various applications including measuring operations between PCBs, inside cases, and in construction settings. It is also used for the protection of historic monuments.

Specifications:

Operative Range: -30 to +100 °C, 5 to 98% RH
Humidity Measuring Circuit:
- Measuring Range: 0 to 100% RH
- Sensor Type: Capacitive
- Accuracy: ±2% RH for <90% RH at nominal temperature
- Reproducibility: <1% RH at nominal temperature
- Nominal Temperature: +25 ±3 °C
- Response Time T63: Approx. 10 seconds at 1 m/s
Temperature Measuring Circuit:
- Sensor Type: NTC type N
- Accuracy: -20 to 0 ±0.4 K, 0 to +70 ±0.2 K, +70 to +100 ±0.6 K
- Reproducibility: 0.1 K

Mechanical Design:

Sensor Tube: Nickel-plated, 50 mm long, 5 mm Ø
Protective Cap: None
Cable: High-temperature cable (up to +100 °C), 2 meters long, with ALMEMO® plug

Technical Data:

PTFE Filter: Inside diameter 5 mm, suitable for dust protection, not waterproof
Calibration: DAkkS accredited or factory calibration available, compliant with DIN EN ISO/IEC 17025

Usage Notes: The sensor must be directly plugged into an ALMEMO® device and cannot be used with extension cables. Alternative sensor types include FHAD36RAS, FHAD46-C2, and FHAD46-C0.

Accessories and Variants: The document lists order numbers for accessories and variants, including the miniature sensor FHA646R with a high-temperature cable.

Additional Information: The document reserves the right to make technical changes and provides a note on the calibration certificates.

Catalog excerpts

• Compact sensor, extremely small dimensions • Wide operating temperature range • Particularly suitable for measuring operations between PCBs, inside cases, in walls, ceilings, and insulation layers used in the construction industry, and for the protection of listed historic monuments Technical data Operative range Humidity measuring circuit Measuring range 0 to 100 % RH Sensor Accuracy Reproducibility Nominal temperature Response time T63 ±2 % RH in the range <90 % RH at nominal temperature <1 % RH at nominal temperature +25 ±3 °C Temperature measuring circuit Sensor NTC type N Mechanical design Sensor tube nickel-plated, 50 mm long, 5 mm 0 Cable High-temperature cable (up to +100 °C), 2 meters long, with ALMEMO® plug (no other lengths available) 11/2025 • We reserve the right to make technical changes. ! The sensor can only be operated by plugging DIRECTLY onto an ALMEMO® device. (NOT with extension cables ZA9060VKx or ZA9090VKCx). Or alternatively, the following sensor types can be used. FHAD36RAS up to +100 °C FHAD46-C2 or FHAD46-C0 Compact design Accessories PTFE filter, inside diameter 5 mm suitable for protection against dust, not water-proof Miniature sensor for temperature / humidity, with fitted high-temperature cable, length 2 meters, with ALMEMO® plug FHA646R DAkkS accredited calibration or factory calibration KH9xxx temperature, humidity for measuring chain (sensor + device), see chapter „Calibration certificates“. DAkkS accredited calibration meets all the requirements regarding test resources laid down in DIN EN ISO/IEC 17025.

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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