Westermo RM-505U-K - Manual (Page 12)

505K Radio Telemetry Module User Manual
    ELPRO Technologies Pty Ltd 2008 Page 12
sample time (0 – 32727 sec or 9.1hours) “wakes” the 505K from sleep mode and turns on the
analogue loop supply. The “warm-up time” (0 – 100 seconds) allows the transducer to reach
rated accuracy before the 505K makes a measurement of the analogue signal.
For example, if the sample time is 30 minutes and the warm-up time is 10 seconds, then every
30 minutes, the 505K will turn on its analogue loop supply and after a further 10 seconds,
take a measurement of the analogue signal. After the measurement is taken, the 505K reverts
to sleep mode. The loop voltage available for a transducer is approx. 24VDC.
If the warm-up time is set to the same or more than the sample time, then the analogue loop
will be on continuously, and the 505K will measure the signal based on the sample time. For
example, if the sample time is 10 seconds, and the warm-up time 20 seconds, then the
analogue loop will be continuously active and a measurement made every 10 secs. If the
sample time is set to zero, then a measurement is made every cycle of the 505K - that is,
0.5 sec.
Note that continuous analogue loop operation will result in a short battery life if a battery
supply is used. A solar panel and battery supply is suitable.
If an externally powered analogue signal is connected, then the same measurement process as
described above occurs .
When the 505K takes a measurement, it will transmit the analogue value if the value has
changed by more than the pre-configured sensitivity since the last transmission. The
sensitivity can be configured from 0.1% to 75% with a default value of 3%. If the change in
the signal since the last transmitted value is less than the sensitivity, then the 505K will not