System Description
Electronics
Thermo Electron Corporation Model 42i Low Source Instruction Manual 8-7
• I/O Expansion Board Data
• Digital Output Board
• 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
• Fans and solenoid outputs
• Cooler control
• 120VAC outputs for the pump and temperature control board
• Ozonator
• Pressure sensor
• Ambient temperature sensor
• Temperature control board
• PMT high voltage supply
• Measurement input board
• Permeation oven option
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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