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P-RAEBER
Electronic Instruments |
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The Humigraf compared with other
instruments
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Thermometer, Hygrometer |
- No permanent data record
- Shows no
historical data – only current values
- Cannot
provide a permanent record for documentation
purposes.
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Drum recorder |
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Drum recorder has significantly
greater physical dimensions typically 10 to 15
times the volume of the Humigraf.
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Drum recorder is significantly
heavier – typically four to eight times the weight
of the Humigraf
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The paper must be changed frequently
– typically weekly or monthly
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The recording mechanism is subject to
wear, ink has to be refilled and the pens have to be
changed regularly
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The drum mechanism means that the
pressure record of pressure variation is often
printed on a curved, rather than a linear axis –
which makes quick and accurate interpretation of the
data difficult.
- No digital
display
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No additional functions such as
Alarm, display of Minimum and Maximum values.
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Data logger |
- Laptop required
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Display only visible if the laptop is
running
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Stored data unsuitable for use for
legal / documentation purposes, as this can easily
by manipulated by PC.
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