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16
4.0 BASIC BLOCK DIAGRAM THEORY OF OPERATION
4.1 PROBE ASSEMBLY
See Figure 4-1, the Probe Assy. Basic Block Diagram.
The Probe Assembly is a stand-alone, completely self-contained measuring system. All
units include the RH and Temperature Sensors, and some optional probes include a
Pressure Sensor as well. The field-replaceable Sensor Circuit Board has standardized
output levels for all three measured parameters. Therefore, boards may be quickly
replaced while in operation without the need for recalibration, maintaining full system
accuracy. The Microprocessor performs the system control, parameter calculation, and
serial digital communications. Digital-to-Analog (D-A) conversion provides three 0 to 10
Vdc linear Analog Outputs corresponding to the measured and/or calculated
parameters.
The serial digital RS232 interface is bi-directional, allowing the user to not only receive
and record measured information, but to remotely control output scaling, alarm relay
setpoints, and other functions as well.
Figure 4-1 Basic Block Diagram, Probe Assy
RH
SENSOR
TEMP.
SENSOR
PRESSURE
SENSOR
NORMALIZATION - CALIBRATION
STAGE
MICROPROCESSOR
D-A D-A D-A
SENSOR BOARD PLUG-IN ASSY.
SENSOR BOARD PLUG-IN CONNECTOR
0 - 10 VDC
RH OUT
0 - 10 VDC
TEMP. OUT
0 - 10 VDC
PRESSURE OUT
RS-232
(TX)
RS-232
(RX)
SERIAL PORT
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