User manual

905K Radio Telemetry Module User Manual

 ELPRO Technologies Pty Ltd 2010 Page 38

Consider the above

example, with 905K #14.

This module is mounted on

a water tank, and the

analog input is a level

transducer. The 905K is

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 analog 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

measurement was taken every 5 sec. Because the warm-up time is still zero, the analog loop is

continuously active.

4.5 Analog 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

analog input value. If the

analog input is less than the

low setpoint, then the setpoint

status is "on". If the analog

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.

4.6 Supply Voltage

The supply voltage may be mapped as an internal analog input. The 16 bit value corresponds to

0-30V. There is no analog sensitivity for this measurement - it is only transmitted based on the

configured update time. The measurement is taken every time the 905K transmitter operates.