Revision 1 17 9/10/2019
2.2 Motherboard
2.2.1 Description of the Motherboard
The motherboard is housed in an enclosure and consists of a large main board which houses
the system memory, system’s clock battery, the AC and DC power supplies, 6 isolated
analog outputs, 6 relays, 8 solenoids, 4 (Wet contact) discrete inputs and 4 (Dry contact)
discrete inputs. The type of enclosure the electronics is housed in will depend on the area
classification certification of the analyzer.
2.2.2 Boards Associated with the Motherboard
The main processor daughter board and an optional Ethernet card are associated with the
motherboard.
2.2.3 AC and DC Power Supply
The motherboard houses the AC and DC power supplies. The working AC voltage range is
100-240 VAC and the DC voltage range is 10-32 VDC.
If an AC supply is used, the analyzer uses the AC solenoid drivers which are Black in colour.
If a DC supply is used, the analyzer uses the DC solenoid drivers which are Red in colour.
The analyzer can operate in a dual redundant power mode in which the DC power supply is
the backup if the AC power supply fails. It is important to note that in this mode the DC
solenoid drivers would be used.
2.3 LCD Display Board, Keypad and LED’s
2.3.1 User Interaction Features
The system presents the system status to the operator via a 128 x 64 LCD display on the
front panel. In addition, there are ten LED indicators which provide information about the
status of the system.
A hand held keypad is used to communicate with the system. Operation of the system via the
keypad is described in Section 4.
A detailed application program for a personal computer is provided to monitor the system,
view archived data and establish input and output protocols from/to external devices. A
detailed discussion of the user interface is presented in Chapter 5.
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