Westermo RM-505U-K - Manual (Page 34)

505K Radio Telemetry Module User Manual
    ELPRO Technologies Pty Ltd 2008 Page 34
Consider the above
example, with 505K
#14. This module is
mounted on a water
tank, and the
analogue input is a
level transducer. The
505K is powered by a
BU-5-2 battery pack
and to conserve
power, a
measurement is taken
every 30 minutes
(1800 sec). The
transducer requires a
warm-up time of 7
seconds to achieve accuracy, so a value of 10 seconds is chosen.
In another application involving the continuous monitoring of pressure in a pipeline, values
of zero are chosen for the sample time and warm-up time. The analogue loop will be
continuously active and a measurement is taken every 0.5 sec. Because occasional pressure
fluctuations caused a lot of transmissions, then the sample time value was increased to 5
seconds, and a measurment was taken every 5 sec. Because the warm-up time is still zero,
the analogue loop is continuously active.
4.5 Analogue Setpoints
A high
setpoint value
and a low
setpoint value
may be
entered. The
internal
setpoint status
is determined
by these values
in comparison
to the
analogue input
value. If the
analogue input
is less than the low setpoint, then the setpoint status is "on". If the analogue input is more
than the high setpoint, then the setpoint status is "off". When the input is between the low
and high setpoints, then the setpoint status remains unchanged.
The setpoint values may be set between 0 and 100% of the calibrated range. The low setpoint
may be set to the same value as the high setpoint, however the low setpoint should not be set
to a higher value than the high setpoint.