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MultiRAE
User’s Guide
66
11 MultiRAE Pro Multi-Threat & Gamma Operation
MultiRAE Pro monitors equipped with a gamma radiation sensor in addition to one or more sensors for
detecting chemical threats can operate in three measurement modes:

Multi-threat mode , in which the instrument monitors for both chemical threats and radiation on
a sequential basis

Radiation-only mode , in which the instrument continuously monitors for gamma radiation and
does not monitor for chemical threats

Gas-only mode , in which the instrument continuously monitors for gaseous threats and not for
radiation
The specifics of each operating mode are described in the following sections.
11.1 Multi-Threat Mode For Simultaneous Radiation & Gaseous Threat
Measurements
Multi-threat mode is the default mode of MultiRAE Pro’s operation. Multi-threat mode is only available
on MultiRAE Pro monitors equipped with a gamma radiation sensor, provided the gamma sensor is
enabled. The minimum instrument firmware requirements for the gamma sensor are:

Application firmware: v.1.14 or higher

Sensor firmware: v.1.04 or higher
When the monitor is turned on, it boots up in multi-threat mode to monitor for both gamma radiation and
gaseous threats. Measurements are done in sequence: Gas measurements are taken first, followed by
gamma radiation measurements.
Under alarm-free conditions, gas measurements are taken during 55 consecutive seconds out of every
minute, followed by gamma radiation measurements that are taken during the remaining 5 consecutive
seconds. When gas measurements are taken, the instrument’s internal sampling pump is turned on, and
when radiation measurements are taken, the pump is always turned off.
In other words, out of every minute of alarm-free operation, the instrument monitors for gas during the
first 55 seconds, followed by the 5 seconds of gamma radiation monitoring, as illustrated below:
MultiRAE Pro Operation in Multi-Threat Mode under Alarm-Free Conditions