AM16/32B Relay Multiplexer
18
are available from Campbell Scientific. Examples include soil moisture probes
and thermistor probes.
8.2.3 Contact Degradation
Once excitation in excess of 30 mA has been multiplexed, that channel’s relay
contacts have been rendered unsuitable for further low voltage measurement.
To prevent undue degradation, it is advisable to reserve certain channels for
sensor excitation and employ other channels for sensor signals.
(p. 2)
, for more information on contact
degradation.
