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Satellite XT 4-20 mA Versions
1.2.1.1
Alarm Level Settings
The settings for Alarm Level 1 and Alarm Level 2 are automatically loaded when installing
the sensor. Standard settings are 1x and 2x TLV or 20 and 40 % LEL for the target gas.
The Alarm Setup function in the Configuration Menu allows the user to change the alarm
levels as required.
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.
Instruments with relay option will additionally trigger the associated alarm relays.
1.2.1.2
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 actuating the <set> key. If the password protection is
enabled, the password must be entered (see Configuration Menu / Security Function).
Alarm Reset is not possible, if the alarm condition is still present.
1.2.1.3
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:
Actuate 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:
Actuate 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.
1.2.2
Maintenance Mode
The Maintenance Mode indicates a complete absence of monitoring capability. The green
status LED is off. A maintenance output signal is transmitted to external control systems.
This maintenance output signal can be configurated either steady, i.e. 2.4 mA, or
alternating, i.e.2.4 to 4.0 mA, 1 Hz.
Depending on the configuration, instruments with relay option will additionally activate the
fault relay.
1.2.3
Warning Condition
A warning condition indicates that the Satellite XT requires some attention, but the
instrument is still able to monitor and operate as programmed.
The following will occur when the Satellite XT detects a warning condition:
- the green status LED is flashing
- an alternating signal (2.8 to 4.0 mA, 0.1 Hz) is sent to external control systems;
depending on the configuration, this function can be enabled or disabled.
- instruments with relay option will additionally activate the fault relay, depending on the
configuration.
1-2
Basic Operation – Section 1