ATI
Model F12/D Gas Transmitter
Part 4
– Operation
35
O&M Manual (Rev-H)
Trouble Indication
The Trouble alarm is indicated by four dashes appearing on the Main Display,
along with the (!) flag in the lower left corner, and the 4-20mA status icon
indicating that the 4-20mA output is fixed (default = 3.6mA).
Figure 36. Main Display Trouble Indication
Timed Return to Main Display
Menus and other pages used for configuring the transmitter and sensor return to the Main Display after 5
minutes of no key activity. Exceptions to this behavior include the zero and span calibration pages.
Inhibiting Alarms from the Main Display
Pressing the
ESC
key for 3 seconds, then releasing, toggles the alarm inhibit mode. If alarm inhibit was
off, it is turned on for 15 minutes (default value). If alarm inhibit was on, it is turned off, and in addition,
the sensor warm up period is expired immediately (see status indicators above).
4.4 Pop-up Displays
Sensor Removed Display
Removing the gas sensor causes the transmitter to “pop-up” the Sensor Removed Display (below), which
displays a count-down timer. During this time, alarms are inhibited and the current loop output is fixed at
4.0mA (17.4mA for Oxygen sensors). A trouble alarm will occur if a sensor is not installed before the
timer expires. This 60 second period is usually long enough to reinstall the sensor, or install a
replacement, but if more time is needed, the count may be
extended to 5 minutes by selecting “Reset”.
Selecting “Exit” forces expiration of the timer and exits to the Main Display, which will then indicate the
Trouble alarm is active (see Figure 36 above).
Figure 37. Sensor Removed Display
Sensor Installed
When a sensor is installed, the transmitter compares the type to the previously installed sensor.
If they match, the previous sensor’s settings are copied to the new sensor, if necessary
3
. The
transmitter then starts the sensor review as shown in
3
The transmitter sets the new sensor’s range, blanking, damping, and alarms to match the previously installed sensor,
which might cause confusion when transferring sensors from field transmitters to shop transmitters for calibration.
During review, the shop transmitter will display the settings of the previously installed sensor, which might not match
the field transmitter. Fortunately, this is not a real problem. The sensor may be calibrated as normal, and when it is
eventually returned to the field, the field transmitter will restore its original settings. Always verify settings of field
transmitters.
Esc
Sensor Removed
►Reset Exit
00:59
Sensor Removed
PPM
H2S
MENU
----
Main Display
!
3 seconds
