Easidew Online User’s Manual
40 97094 Issue 18.5, March 2016
MAINTENANCE
4 GOOD MEASUREMENT PRACTICE
The Easidew Online Hygrometer is designed to operate in a fl owing gas stream and is
suitable for the measurement of the moisture content of a wide variety of gases. In
general, if the gas (in conjunction with water vapor) is not corrosive to ceramics or base
metals then it will be suitable for measurement by the Easidew Online.
The transmitter is designed for operation with sample gas fl ow rates of 1-5 Nl/min
(sample block), 1-10 Nl/min (direct connection). Ideally, the fl ow rate should be set-up
between 4 and 6 Nl/min (8.5 and 12.7 scfh), (5 Nl/min (10.6 scfh) is the recommended
optimum. Flow regulation is not provided within the Easidew Online system. Sample
gas fl ow must therefore be regulated outside the instrument, on the input side of the
sample block by means of a precision needle valve. Always use high quality valve gear,
coupling connections and pipework.
The transmitter will operate successfully at fl ow rates within its operational range and
it is important to ensure that the fl ow rate through the sample block is high enough to
avoid long time lags in response to humidity changes at the sample source.
Avoid pressure gradients in the system by placing excessive fl ow restriction on the
output side of the sample block. In applications where the test gas has a very high
fl ow rate, an instrument by-pass arrangement is preferable to fl ow restriction after the
transmitter.
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