Centrally mounted sensors (see left),
have the following disadvantages:-
1. The sensors are prone to contamination. This is serious for the RH
sensor, where surface contamination can cause loss of sensitivity, calibration
and response speed.
2. The sensors are prone to mechanical mis-alignment, because they are
held in place by weak connecting wires only. Misalignment during manufacture
gives rise to inconsistent characteristics from probe to probe.
Misalignment during use gives rise to flux calibration changes.
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