Principle Of Operation; Operating States; Monitoring Mode - Honeywell Satellite XT Manual To Operations

This section provides a basic understanding of the instrument and its operation.
1.1

Principle of Operation

The Satellite XT R Version is a generic gas monitoring instrument for the detection of a wide
range of hazardous gases. Power is supplied by a local 12 to 24 VDC power supply.
Target gas and measuring range depend on the type of sensor chosen. The sensor comes with
the specific data in its internal data memory.
The Satellite XT R Version provides 3 single-pole single-throw relays for activation of external
alarm devices. If the gas concentration exceeds the alarm levels, the instrument will activate
the appropriate alarm relay and display an according message. A relay will also be activated in
case of an instrument fault.
1.2

Operating States

There are four different operating states for the Satellite XT, Monitoring Mode, Maintenance
Mode, Warning Condition, and Diagnostics. Depending on the selected operating state, the
green status LED is either on, off, or flashing.
1.2.1

Monitoring Mode

The Monitoring Mode is the instrument's standard operating mode. In the Monitoring Mode,
the instrument continuously monitors for hazardous gas concentrations and checks for alarm
levels and instrument faults.
The instrument's self-diagnostics provides on-line preventive maintenance information
identifying electronics or sensor problems, e.g. a sensor selftest is performed every 24 hours.
The green LED located above the <set> key is on.
The settings for Alarm Level 1 and Alarm Level 2 are automatically loaded when installing the
sensor. Standard settings are 1x and 2x TLV (Threshold Limit Value) for the target gas. The
Alarm Setup function in the Configuration Menu allows the user to change the alarm levels
according to their specific requirements.
Whenever the concentration of the target gas exceeds the factory or user programmed alarm
levels, the instrument will document this concentration alarm condition on its LCD Display and
trigger the associated alarm relays.
1.2.1.1 Reset Alarms Function
Ex factory, Alarm 1 and Alarm 2 are preprogrammed "enabled" and "latching". In the event of a
concentration alarm, the alarm indication with latching alarms will continue until the alarm is
manually acknowledged by pressing the <set> key. Alarm Reset is not possible, if the alarm
condition is still present.
1.2.1.2 Exiting the Monitoring Mode
Exiting the Monitoring Mode and entering the Maintenance Mode may be password protected.
To prevent the instrument from manipulations by unauthorized personnel, it is recommended to
enable this function (see Configuration Menu / Security Function).
- Password enabled:
Press the <esc> key to exit the Monitoring Mode and enter the password. The screen to enter
the password is shown for one minute. During this period the Monitoring Mode remains active
in the background. When the correct password has been entered, the instrument is in the
Maintenance Mode, it is not monitoring, and the green LED is off.
- Password disabled:
Press the <esc> key to exit the Monitoring Mode. The instrument is now in the Maintenance
Mode, the instrument is not monitoring, and the green LED is off.
Satellite XT R Version
Basic Operation - Section 1
1-1