System Description
Electronics
8-8
Model 5030
i
SHARP Instruction Manual
Thermo Fisher Scientific
Connectors located on the measurement interface board include:
●
Data communication with the motherboard
●
24 V and 120 VAC power supply inputs
●
Fan and solenoid outputs
●
120 VAC output and thermistor input from the sample heater
●
Flow and pressure sensor inputs
●
Proportional valve output
●
Optical pickup input
●
Pre-amp board
●
Ambient temperature/RTD and RH
●
Flow RTDs
The flow sensor system consists of a subsonic orifice inside the primary
measurement head, a differential pressure and vacuum sensors, and a flow
temperature RTD. The flow system 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 three pressure
transducers with tube connections. The pressure transducer output is
produced by measuring the pressure difference between the sample gas
pressure and ambient air pressure.
The detector amplifier assembly amplifies the signal from the proportional
detector that receives beta particle emissions from the C-14 source through
the sample and filter tape. The output of the detector amplifier is fed to the
measurement interface board. A coaxial cable from the detector amplifier
supplies power and grounding to the detector.
The digital output board connects to the motherboard and provides
solenoid driver outputs and relay contact outputs to a connector located on
the rear panel of the instrument. Ten relay contacts, normally open (with
power off), are provided, which are electrically isolated from each other.
Eight solenoid driver outputs (open collector) are provided along with a
corresp24 VDC supply pin on the connector.
Measurement Interface
Board Connectors
Flow Sensor System
Pressure Sensor
Assembly
Detector Amplifier
Assembly
Digital Output Board
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