6-2
6 Operation
After applying power to the detector, the display
will go through a startup test routine illuminating
in sequence all the LEDs, icons and digits of
the display. The display will show the message
‘WAIt’ and ‘LoAd’ as it checks for cartridge
data, typically less than 180 seconds. It will
then display the message ‘WArm’ until the
sensor cartridge reaches operating temperature.
When complete, the detector will enter normal
monitoring mode indicated by the ‘ ’ icon on the
display cycling through three states (2 rings, 3
rings, 4 rings). The measured gas concentration
will be shown on the display. The green LED will
flash once every second indicating power and
the sample flow rate indicator will be displayed.
If monitoring is interrupted due to a fault, a test
or calibration process or a user requested inhibit,
the display will flash. For details of fault and
maintenance fault codes refer to Section 11.
Note
The rst time the Midas® is started with a
new sensor cartridge, an F49 or F88 fault
code may be displayed; there is no actual
fault and the fault message can be cleared
by depressing the ‘X’ cancel button for two
seconds.
Final Start Up Routine Screen
Normal Operation
6.1 Normal Operation Mode
In this mode the detector displays gas
concentration, alarm, fault and status information
via its backlit LCD and front panel LEDs. Typical
normal operation display and output states are
shown below. See Section 11 for a full list of fault
codes.
Note:
The examples in Table 6-1 are for a linear
4-20 mA output over a full scale range of
2 ppm. The current output for a given gas
concentration will be dierent for other full
scale ranges (linear 4 mA = 0 % full scale to
20 mA = 100 % full scale). The alarm and
fault relays are in default (latching) mode.
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