Hat hygrometer

IGR.PARETE 70 Wall-Mounted Hair Hygrometer – Complete Technical Data Sheet

📦 Product information

Item code: WALL HYGIENE 70

Italian name: Wall mounted hair hygrometer

English name: Hair Hygrometer / Wall Hygrometer

Type: Analog humidity control instrument

Compatibility: FIEM MG and Astrale series (pre-drilled holes)

🔍 What is a hair hygrometer?

The hair hygrometer is an analog instrument that measures relative humidity using the hygroscopic property of hair (natural or synthetic). Human hair, exposed to relative humidity between 2.5% and 100%, stretches proportionally to the increase in humidity.

Operating principle:

1. A bundle of hair (natural or synthetic) is secured at one end
2. The other end is connected to a mechanical lever system
3. As humidity increases, hair grows longer.
4. Levers transmit movement to a hand
5. The hand indicates the %RH value on the graduated scale

This principle was perfected in 1783 by the Swiss scientist Horace-Bénédict de Saussure and remains one of the simplest and most economical methods for measuring humidity today.

⚙ Technical features

📊 Detailed Comparison: Hair vs. Wet Bulb

✅ Advantages of a hair hygrometer

• It works without electronics: No power or batteries required
• Instant installation: It fits into the MG/Astrale pre-drilled holes
• No water maintenance: No need to fill tanks or change socks
• Robust: Also suitable for less than perfect conditions
• Continue reading: Always visible without having to open the incubator
• Quality models: Accuracy ±3% RH in the 20-85% range

❌ Disadvantages of professional incubation

• Slower reaction speed: A 15% change takes 5-25 minutes to register
• Calibration sensitivity: If the hair is worn, dirty or not regenerated, the readings become inaccurate.
• Variable accuracy: Errors of 5-10% in basic models, especially below 20% and above 85% RH
• Non-specific for incubation: Designed for general environments, not calibrated to 37.8°C
• Nonlinearity: Hair length variation is not proportional to humidity
• Degradation over time: The hair loses elasticity and precision
• Extreme temperatures: Does not work below -30°C (fiber freezing)

🏆 Which one to choose?

Choose the HAIR hygrometer if:

• Do you want a simple and immediate visual check?
• Your incubator has pre-drilled holes (MG/Astrale series)
• You don't want to deal with maintenance (water, socks)
• You need it as a complementary indicator, not as the main reference

Choose the WET BULB hygrometer if:

• You want the highest possible accuracy (±3% RH)
• You need an instrument calibrated for 37.8°C (incubation temperature)
• You need to check the accuracy of the digital sensors
• Manage professional incubations where humidity is critical

🔧 Installation

Simple procedure

1. Place the hygrometer in the incubator in a place visible from the outside.
2. Wait 30-60 minutes for the reading to stabilize

💡 Tip: To check the calibration, you can use the saturated salt method. Place the hygrometer in a closed container with moist table salt: after 24 hours, it should indicate about 75% RH.

🔧 Maintenance

🔧 Calibration procedure (saturated salt method)

To check the accuracy of your hair hygrometer, follow this recommended procedure:

Necessary material

• • • Airtight container (glass jar with lid or food storage container)
    • Regular table salt
    • A few drops of water
    • Stand or grid to lift the hygrometer

Step-by-step procedure

1. Prepare the airtight container: Glass jar with lid or tightly sealed food container
2. Prepare the wet salt: Put table salt in a small cup and add a few drops of water until you get a "mush" (do not add excess water)
3. Place the hygrometer: Lift it off the salt using a rack or stand - it should NOT touch the salt or water.
4. Seal tightly the container
5. Please wait as long as necessary: For hair hygrometers you need 18-24 hours
6. Read the value: The humidity inside the jar must be 75% RH ± 2%

📌 How to interpret the reading

• • • 73-77% RH: Perfect, hygrometer calibrated correctly
    • 70-80% RH: Acceptable for hair hygrometers (they are not ultra accurate)
    • Error ±10%: It needs to be adjusted if it has a calibration screw
    • Top error: Old/dirty/dry hair → regenerate it or replace the hygrometer

🆘 Common errors that distort calibration

1. Salt too wet: Creates 100% RH instead of 75%
2. Non-airtight container: External humidity affects the reading
3. Changing temperature: Maintain stable temperature during the test
4. Hygrometer touching salt: He must remain relieved
5. Hair that has not been regenerated for years: It loses elasticity and precision

✔ Advice from 45 years of experience

Hair hygrometers are reliable, but:

• • • They react slowly to changes
    • After years they become "lazy" with major mistakes
    • The high temperatures of the incubator stress them

Use them as a complementary periodic check, not as the primary tool. For accurate reference measurements, we recommend the wet bulb hygrometer calibrated to 37.8°C.

• Cleaning: Periodically clean the dial with a soft, dry cloth
• Calibration: Check with salt method every 6-12 months
• Hair regeneration: If readings are inaccurate, expose to steam for a few minutes
• Avoid: Direct water splashes, excessive dust, impacts

🛒 Commercial information

Price: €24.20 (VAT excluded, shipping excluded)

Compatibility: FIEM MG and Astrale series (pre-drilled holes)

FIEM WAREHOUSE COMO – Padovan Avicoltura: original accessories for incubation.

💡 Related products

• Wet Bulb Hygrometer HNB (€24.50) – For precision control
• HNB-K Replacement Socks (price to be verified) – For wet bulb hygrometer
• Analog thermometer °F (0.5/A) (€22.05) – Temperature control
• Prismatic Hygrometer °F F58 (price to be verified) – Other model available

📦 Logistics and times

• Shipping: 1 working day
• Delivery: 2-4 business days
• Departure: FIEM Como Warehouse
• Packaging: Protected for precision instruments

✅ Guarantee

• Warranty: 24 months private, 12 months VAT number
• Assistance: WhatsApp 351 881 9586

❓ Frequently Asked Questions (FAQ)

Q: Will this fit my MG70 incubator?
A: Yes, it is designed to fit the MG (50/70/100/140/200/244/316) and Astrale series bores.

Q: Is it more accurate than the wet bulb hygrometer?
A: No, the hair hygrometer is accurate to ±5% typical (±3% in better models), while the wet bulb is accurate to ±3% and is specifically calibrated to 37.8°C.

Q: Do I need to calibrate it before use?
A: It is advisable to check the calibration using the saturated salt method (it should indicate ~75% RH).

Q: How long does a hair hygrometer last?
A: With correct use, several years, but the hair loses elasticity over time and precision decreases.

Q: Can I use this as my only humidity monitoring tool?
A: Yes, it's a practical solution for incubators without a built-in hygrometer. For professional monitoring, we also recommend a wet-bulb hygrometer as a reference.

📞 Need help?

📋 Legal Notice and Rights

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