System Description
Electronics
8-8 Model 48i Instruction Manual Thermo Electron Corporation
• AC distribution
Measurement Interface
Board
The measurement interface board serves as a central connection area for all
measurement electronics in the instrument. It contains power supplies and
interface circuitry for sensors and control devices in the measurement
system. It sends status data to the motherboard and receives control signals
from the motherboard.
Measurement Interface Board
Connectors
Connectors located on the measurement interface board include:
• Data communication with the motherboard
• 24V and 120VAC power supply inputs
• Fan and solenoid outputs
• 120VAC output and thermistor input from the bench heater board
• Flow and pressure sensor inputs
• Chopper motor output
• Optical pickup input
• Pre-amp board
• Ambient temperature thermistor
• Purge flow switch input
Flow Sensor Assembly The flow sensor assembly consists of a board containing an instrumentation
amplifier and a flow transducer with input and output gas fittings. The flow
transducer output is produced by measuring the pressure difference across a
precision orifice. This unit is used for measuring the flow of sample gas in
the measurement system.
Pressure Sensor Assembly The pressure sensor assembly consists of a board containing an
instrumentation amplifier and a pressure transducer with a gas input fitting.
The pressure transducer output is produced by measuring the pressure
difference between the sample gas pressure and ambient air pressure.
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