Echo
®
Wireless Vibration Sensor Manual
Version 1.2, 2011-12-07
12
Factory Defaults
The factory defaults are defined below unless otherwise specified. See the explanation of
the parameters below.
Sensor ID is a unique factory set number for each sensor and
cannot
be changed.
Transmission Interval = 8 hours
RVL = 0 (off)
CF Repot Threshold = 0.02
Transmission Power = High
Transmission Band = 1
Explanation of Echo® Wireless Sensor Parameters
Parameters can be changed by using the up and down arrows or by typing the values in
the appropriate box. Click on the
Set
button by the parameter to actually program the
sensor.
Sensor ID
The Sensor ID is a unique ID programmed into and etched onto each sensor at the
factory. This number cannot be changed.
Transmission Interval
The Transmission Interval is the time between transmissions of measured data.
The factory default is 8 hours. That means the sensor will “wake up” and make a
measurement every 8 hours (3 times per day). At the default 8 hour transmission
interval, the primary lithium-thionyl chloride (Li-SOCl
2
) batteries are expected to
last in excess of 5 years.
Note
: Decreasing the transmission interval (i.e., increasing the number of
measurements per day) will not only reduce battery life but will also use more
receiver bandwidth. Thus, fewer sensors can be used with a receiver. See the
Echo
®
Receiver User’s Manual
for guidelines regarding the number of sensors
that can be used per receiver.
RVL (Residual Vibration Level)
The RVL is an rms velocity level in ips (inches/second). If it is set to 0 (zero), the
feature is off and the sensor will wake up at the programmed interval, make
measurements, and transmit them. If a value is set, the sensor will wale up at the
programmed interval and start a measurement. If the rms velocity is ≥ the RVL,
the measurement and transmission will proceed as normal. If the rms velocity is <
the RVL, the machine is assumed to be off and the measurement is terminated.
This both conserves battery power and minimizes the transmission of “bad data”.
CF Report Threshold
CF (crest factor) is the ratio of true peak acceleration divided by rms acceleration.
For a sine wave, this value is 1.414. Echo
®
sensors high pass filter both the true
