User's Manual

Page 8 of 13
Explanation of Echo
®
Wireless Sensor Parameters
Sensor ID – The Sensor ID is a unique ID programmed for each channel of the junction
box and set at the factory. This number cannot be changed.
Transmission Interval – The Transmission Interval is the time between transmissions.
The factory default level is 8 hours. The junction box will “wake up” and make a
measurement on each active channel every 8 hours (3 times per day).
Decreasing the Transmission Interval will provide data more often;
however, transmitting more often will decrease battery life. Keep in
mind “more data is not better data” and may be more than you can
process and manage.
RVL (Residual Vibration Level) – This is the minimum Residual Vibration (that is,
vibration that is currently present) for the junction box to wake up and make a
measurement on that specific channel. If the current vibration is below the RVL, the
junction box will assume the equipment is turned off and will not waste power
transmitting unusable data. If the value is set to “0” this feature is disabled and will
always make a measurement.
CF Report Threshold – Because crest factor is the ratio of true peak divided by RMS
vibration, in some instances where the RMS value is extremely low (such as slow speed
equipment) the crest factor will appear exceptionally high. This report factor is the
minimum RMS level in g for the Crest Factor to be reported.
Sensor Status – The sensor status displays if the specific channel is enabled or disabled.
If no sensor is attached to a channel, it is recommended to disable the channel to save
power and avoid bulking the database with bad information.
Acceleration Gain – Gain value used to normalize and calibrate acceleration
measurements.
Velocity Gain – Gain value used to normalize and calibrate velocity measurements.
Calibrating the Junction Box to Specific Accelerometer Sensitivities
The EchoPlus
®
Wireless Junction Box can be calibrated to work with an accelerometer of
any sensitivity. It can also be used to fine tune and normalize data collected from sensors
with slightly different sensitivities. To do this, we need to get the specific Velocity Gain
and Acceleration Gain values.
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