MODEL AT3
3 – 1
SECTION III – OPERATION
INTRODUCTION
Once the system has been installed, the hardware must be set up for your particular application, and
checked to ensure that it is operating properly. The system operates by sending out a 5 or 15
MHz RF pulse (depending of sensor type) to the transducer, where it is converted to an acoustic
pulse. This pulse travels through the monitored liquid. Reflections from contaminants and the
chamber wall radiate back to the transducer. These reflections are converted to electrical pulses,
amplified by the preamplifier, and transmitted to the receiver. The signals are then time-gated by
the receiver window and compared to a detection threshold. Signals that occur in the focal region
and are greater than the detection threshold are detected by a software algorithm; the results are
processed by a mathematical curvefitting algorithm which converts the raw counts into a
corresponding concentration which is displayed on the LCD display on the front of the system.
BRIEF MENU DESCRIPTION
Pressing "MAIN MENU" displays all of the menu choices available to the user, as shown in Figure 3-1.
Setup
Analog Output
MAIN MENU
Waveform
Calibration
Setpoints
Measurement Setup
Figure 3-1: Main Menu
"SETUP"
Used to set some initial system parameters to match the user's application. These
include the measurement units, damping, the display resolution, and whether the
instrument displays raw data (counts) or a curvefit reading (user-defined measurement
units), or system summary, which consists of raw data, reading, analog output, relay
outputs, and sensor frequency.
"WAVEFORM" Graphically displays the output of the sensor and whatever is reflected back, similar to
an oscilloscope. The user has a choice of three views, depending on whether the
farwall or the measurement window is the main Interest. To get the big picture select
"0-154 µS", while "0-38 µS" gives more detail around the measurement window; "0-77
µS" is a compromise between the two.
Summary of Contents for Monitek AT3
Page 23: ...MODEL AT3 3 11...
