6 SENTRY io US
1 Safety Regulations
1.3 Correct Use
The SENTRY io is a wall-mount multi-channel controller intended for use with MSA fixed gas detection devices. The
controller is housed within a fiberglass enclosure along with the system power supply, input/output modules, field wiring
terminals, and a graphic user interface screen with touch-panel and buzzer.
The SENTRY io is designed to accept standard 4-20 mA analog signal inputs from connected MSA or generic gas
detectors and will also accept discrete inputs from contact closure devices such as switches or relay contacts. The system
provides discrete relay outputs for use in energizing notification devices such as sounders, strobes, or horns. Optional
analog 4-20 mA outputs are also available when specified. All systems include an internal field wiring termination strip to
enable easy connection of interconnecting field wiring conductors.
The SENTRY io enclosure door needs to remain closed during operation of the unit.
The SENTRY io graphic user interface (GUI) with touchscreen provides the SmartStart configuration wizard enabling easy
configuration of user language, date/time, connected gas detectors, discrete input and output signals, and user-specified
cause & effect operating logic.
Multiple SENTRY io system configuration options are available depending upon the number and type of input/output
channels required.
WARNING!
This product is supporting life and health. Inappropriate use, maintenance, or servicing may affect the function of the
SENTRY io and thereby seriously compromise the user’s life.
Do not operate the SENTRY io beyond the limits specified in 7 Technical Specifications.
Before use, the product operability must be verified. The product must not be used if the function test is unsuccessful, the
product is damaged, a competent servicing/maintenance has not been made, or genuine MSA spare parts have not been
used. See 5 System Verification and 8 Maintenance for more information.
Failure to follow this warning can result in serious personal injury or death.
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