Measurement Interface Board - Thermo Scientific 48i Instruction Manual

System Description
Electronics
Measurement Interface
Measurement Interface
Board Connectors
Flow Sensor
Assembly
Pressure Sensor
Assembly
8-6 Model 48i Instruction Manual
The measurement interface board serves as a central connection area for all
measurement electronics in the instrument. It contains power supplies and
Board
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.
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
●
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.
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.
Thermo Fisher Scientific