DM4E, DM4, DM4 DL Operating Manual
Page 5
1.1 How To Use This Manual
This manual describes the features and operation of the DM4E,
DM4, and DM4 DL (with on-board data logger) Ultrasonic Thick-
ness Gauges.
If you are a first time user of the instrument, review Chapter 1 of
this manual to become acquainted with it’s general capabilities.
Follow the instructions in Chapter 2 to prepare the instrument for
operation and perform thickness measurements.
If you are using a model DM4 DL, Chapter 3 provides detailed infor-
mation and operating instructions for the on-board data logger.
Chapter 4 describes how to interface model DM4 DL with a vari-
ety of external devices, such as a printer or personal computer,
via the serial I/O interface.
Chapter 5 provides important specifications, particularly Section
5.2, which lists compatible probes (transducers) and their capa-
bilities.
All users should read “Important Notice” at the beginning of the
manual and Chapter 6, “Application Notes”, for important
information on operator qualification, test conditions, and pro-
cedures that affect measurement results.
1.2 DM4E, DM4, DM4 DL Features
The DM4E, DM4, and DM4 DL Ultrasonic Thickness Gauges are
hand-held, microprocessor controlled instruments designed for
general thickness measurements on a variety of equipment hav-
ing access to one side only. It is especially applicable to the
measurement of remaining wall thickness on tubes, pipes, pres-
sure vessels, and other parts subject to wall thickness loss due to
corrosion or erosion.
The on board Data Logger of the DM4 DL improves the reliability
of recording thickness
readings by avoiding the errors of misread
and misrecorded data. A total of 5390 readings can be stored in
up to 999 separate data files. Displayed readings are recorded
by simply pressing the SEND key or an optional remote hand or
foot switch. Measurement, statistical and instrument data can
be transmitted via the Serial I/O port, in 80 column format,
to a serial printer or personal computer for documentation,
storage and analysis.
Features of the DM4E, DM4, and DM4 DL:
• Rugged, sealed case and keypad for reliability
• Lightweight, ergonomically designed case
• 200 hours on two AA alkaline batteries
• Five keys (nine keys on DM4 DL) control all functions for simple
operation.
1. Introduction
• Automatic probe zero for fast calibration
• Automatically recognizes DIALOG Intelligent Transducers.
• Automatic V-path error correction compensates for non-
linearity of dual element probes.
• Resolution of .001 in, .01 in, .1 mm, or .01 mm
• Large, easily read display with backlight
• Automatic gain adjustment
• Measures a wide range of materials
• Minimum Capture mode captures thinnest reading
Advanced Features of the DM4 and DM4 DL:
• Manual gain adjustment
• Dual Multi “Through Coating (Paint)” Measurement Mode
• Programmable HI/LO thickness limits with LED alarm
• Differential mode displays the difference between measured
thickness and user-set nominal thickness value.
• Band Pass Filter selection to match the frequency of the probe
for best performance.
DM4 DL Data Logging and Communications Features:
• Stores up to 5390 readings.
• Memory can be divided into a maximum of 999 separate data
files of equal length.
• Individual readings or files can be accessed
for reviewing,
editing, and clearing data.
• Serial I/O port provides output to a serial printer or IBM com-
patible personal computer.
• Built-in report format includes instrument, inspector, and probe
IDs, settings,
statistics, and readings.
• DM4 DL Data Transfer Utility Software
transfers data to an
IBM compatible PC for viewing, printing transfer to other soft-
ware.
• UltraMATE
®
and UltraPIPE
®
Windows
95/98/NT compat-
ible software programs.
1.3 How DM4E, DM4, DM4 DL Measure Thickness
These instruments operate on the ultrasonic pulse-echo principle,
similar to sonar. A short ultrasonic pulse is transmitted into the
part by a probe (transducer). The pulse travels through the ma-
terial under test until it encounters an interface, that is a material
with substantially different physical characteristics, such as air or
liquid, at the back surface of the part. At the interface, the pulse
is reflected back to the probe.
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