1.3 The Display & Operating Controls
1.3.1 The Display
The display is a LCD Graphic type that is
illuminated from behind to achieve good
contrast and visibility. Its primary function is
to provide large character readouts of the gas
concentrations together with sample flow
status and key functions.
1.3.2 The Operating Controls
The operating controls are menu driven and
accessed by the 5 keys on the keypad
adjacent to the LCD display. The individual
functions of the keys are clearly labelled on
the display.
Selecting a menu function (by pressing the appropriate key) will cause the function to be
selected, or the next menu to be displayed, as required. In general, the bottom menu key is
used to return to the previous menu, acknowledge a message, or cancel an operation.
1.4 Electrical Outputs
1.4.1 Analogue Outputs
MGA series analysers have up to four analogue outputs, numbered 1 to 4 for connection
purposes. One output is provided for each of the gas channels fitted. When fewer than four
gas channels are fitted, one or more outputs will be inactive or not connected.
Alarm (trip) outputs
Up to five alarm contacts are provided to indicate gas readings above/below/outside user set
concentrations
1.5 RS232 port
An industry-standard serial port is fitted to the rear panel to allow gas readings to be read and
zero to be set by a PC or other computer equipment.
Figure 1 - An example main screen (single gas
model)
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