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System Description
Electronics
Electronics
Motherboard
External Connectors
8-6
Model 43i Trace Level-Enhanced Instruction Manual
The analog output ranges are user selectable via software. The analog
outputs are defaulted based on the measurement range. The defaults are
calculated by dividing the data values by the full-scale range for each of the
three parameters and then multiplying each result by the user-selected
output range. Negative concentrations can be represented as long as they
are within -5% of full-scale. The zero and span values may be set by the
user to any desired value.
All electronics operate from a universal switching supply, which is capable
of auto-sensing the input voltage and working over the entire operating
range.
The internal pump and heaters all operate on 110VAC. An optional
transformer is required if operating on the 210-250VAC or 90-110VAC
ranges.
An on/off switch controls all power to the instrument, and is accessible on
the front panel.
The motherboard contains the main processor, power supplies, a sub-
processor and serves as the communication hub for the instrument.
The motherboard receives operator inputs from the front panel mounted
function key panel and/or over I/O connections on the rear panel and
sends commands to the other boards to control the functions of the
instrument and to collect measurement and diagnostic information.
The motherboard outputs instrument status and measurement data to the
front-panel mounted graphics display and to the rear-panel I/O.
The motherboard also contains I/O circuitry and the associated connector
to monitor external digital status lines and to output analog voltages that
represent the measurement data.
Connectors located on the motherboard include:
External connectors include:
External Accessory
●
RS-232/485 Communications (two connectors)
●
Ethernet Communications
●
I/O connector with Power Fail Relay, 16 Digital Inputs, and 6 Analog
●
Voltage Outputs.
Thermo Fisher Scientific
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