Senquip ORB-X1-G, User Manual

Page: 54 / 136

alarms in the presence of vibration.
The accelerometer is able to detect motion and shocks due to harsh usage even during sleep. If motion or
shock monitoring is enabled and either of those events occurs, a flag will be set. Event flags are checked at
each base-interval and if one exists, an alert message can be scheduled to be sent at that time. The
threshold as well as time for which an activity must be present can be set for both motion and shock monitor-
ing.
Note Pitch and roll warning and alarm levels can be positive or negative. Angle warning and alarms can
only be positive.
Vibration can be used as a trigger to count hours. This may be useful where the number of hours that an
engine is running needs to be calculated.
A full list of accelerometer settings is given in the table at the end of the chapter.
5.2 Pressure Sensor
The ORB contains a built-in pressure sensor for measuring atmospheric pressure and short term height
change. Although the enclosure is rated to IP67, an integrated moisture resistant gore-vent allows
internal and external pressure to equalise, meaning accurate atmospheric pressure measurement.
5.2.1 Specification
Parameter Specification
Pressure range 300 - 1100 hPa
Temperature range -40 to 85°C
Absolute accuracy (0 to 65 deg C) +-1hPa
Relative accuracy (25 to 40 deg C) +-0.12hPa, equivelent to +-1m altitude
Absolute maximum pressure
20,000hPa
5.2.2 Settings
Measurements can be scheduled as a multiple of the base-interval. The fastest possible measurement rate
is achieved by setting the interval to 1 in which case measurements will occur on every base interval. To
reduce power consumption, the measurement rate can be turned down by increasing the interval.
Warning and alarm thresholds for pressure can be enabled. Once enabled, each time a measurement is
completed, the returned value will be compared with minimum and maximum warning and alarm thresh-
olds. If a warning or alarm level is breached, a message will immediately be transmitted. As long as the
warning or alarm condition persists, messages will be transmitted at the exception-interval rather than
the transmit-interval. Hysteresis can be specified in 1 kPa increments, to prevent multiple alarms in the
presence of fluctuating pressure, for instance due to wind.
A full list of pressure sensor settings is given in the table at the end of the chapter.
5.3 Temperature sensor
An integrated temperature sensor allows for measurement of ambient temperature. Please be aware that
the temperature sensor will measure the temperature inside the ORB enclosure; this temperature can be
subject to fluctuations, for example when the internal lithium ion battery is charging and so the environ-
ORB User Guide, Release 1.1
48 Chapter 5. Internal Sensors