To measure the coating thickness on various metal, non-metal
(glass, plastic, composite, concrete, wood, etc.) substrates
TM291 is a new type of handheld high-precision digital Non-metal
coating thickness gauge with A/B scanning. It adopts the principle
of ultrasonic thickness measurement based on pulse reflection. It
is suitable for the measurement of material thickness that can make
ultrasonic wave propagate in it at a constant speed and get the
reflection from its back. The measurement resolution is 0.001mm and
the measurement range is as thin as 0.02mm.It can test the thickness of the substrates and coating at the
same time.
This product can be used in petroleum, chemical industry,
metallurgy, shipbuilding, aerospace, energy and other fields.
Main Function Characteristics
● The measurement range is wide, with a minimum measurement
thickness of coating 20um;Maxinmun thickness as 1800 mm.
● This product can measure the thickness with high precision, and
the maximum measurement resolution can reach 0.001mm; The
repetition resolution can reach ± 0.002mm;
● This product has A-scan mode, B-scan mode and numerical display
mode;
● The coating and paint layers on some composite materials can be
detected according to the different sound velocity of the
materials, and the thickness of each layer of more than 10
multilayer materials can be measured simultaneously, and the
thickness value of each layer can be switched under the same echo.
● It has the functions of penetrating coating and echo to echo
measurement, which is used to measure materials with paint layer
and coating on the surface;
● Multiple measurement modes: THIN, mb-e, E-E and AUTO modes meet the measurement of conventional thick workpieces; Thin,E-E mode realizes the measurement of thin parts;
● Numerical modes include: conventional thickness value mode,
difference / reduction rate mode and maximum value mode;
● Two gain modes: automatic gain / manual gain;
● Manual shutdown and automatic shutdown can be set, with
energy-saving function;
● It supports a variety of probes, including double crystal probe and single crystal probe, and supports up to
20MHz high-frequency probe;
● It supports mass storage and can store 100000 thickness values,
500 groups of A-scan waveforms and 500 groups of B-scan waveforms
at the same time;
● Large 3.5-inch color TFT-LCD display with 320×240 high definition
(QVGA) resolution;
● It has a variety of calibration methods, supports one-point
calibration, multi-point calibration and manual calibration modes,
and can calibrate sound velocity and probe zero position at the
same time; It supports v-path correction of double crystal probe.
● It supports the conversion of metric and British system; It can
switch between millimeter and inch units;
● It supports Chinese and English display;
Applicable Materials
To measure the coating thickness on various metal, non-metal
(glass, plastic, composite, concrete, wood, etc.) substrates.
metals (such as steel, cast iron, aluminum, copper, etc.),
plastics, ceramics, glass, resin, glass fiber and other good
ultrasonic conductors.
Basic Principles
The principle of ultrasonic thickness measurement is similar to
that of light wave measurement. The ultrasonic pulse emitted by the
probe reaches the measured object and propagates in the object.
When it reaches the material interface, it is reflected back to the
probe. The thickness of the measured material is determined by
accurately measuring the time of ultrasonic propagation in the
material.
Specification Parameters
| Item | TM291 |
| Probe type | Single crystal probe / double crystal probe |
| Measuring range (45# steel) | 20um – 1800mm |
| Measurement frequency | 4Hz,8Hz,16Hz |
| Resolution | 0.1mm,0.01mm,0.001mm(0.01inch,0.001inch,0.0001inch) |
| Pulse generator | Negative square wave emission is adopted, and the pulse width and
voltage are automatically matched with the probe. |
| Sound velocity range | 400-19999m/s |
| Calibration block | 4mm(steel) |
| Automatic shutdown | One can choose 5 minutes, 10 minutes, 20 minutes and manual
shutdown. |
| Probe calibration | One point calibration, multi-point calibration,manual calibration |
| gain | Automatic gain control, Manual gain control |
| Gain range | 0~80dB |
| Detection mode | Radio frequency (RF), positive half wave (POS), negative half wave
(NEG), full wave (FULL) |
| Measurement mode | (1)THIN-EE:Thin film coating mode;(2) MB-E: the measurement mode based on the transit time from the
initial echo to the first bottom echo; (3) E-E: penetration coating measurement mode, the arbitrary Em–En
echo is optional; (4) THIN: thin wall measurement mode; |
| Numerical mode | Thickness value mode, difference / reduction rate mode, maximum /
minimum value mode |
| A-scan mode | Available |
| B-scan mode | Available |
| Coupling indication | Available |
| Battery Indication | Available |
| Language | Chinese / English |
| Unit | mm/inch |
| Menu operation | Available |
| Software function | Dynamic gate setting, blanking setting (Blank), echo blanking
setting (E-blank), echo freezing, echo translation and scaling |
| Storage function | It can store 100,000 thicknesses (100 groups, 1000 in each group),
500 groups of A-scan waveforms and 500 groups of B-scan waveforms
at the same time. |
| Host program upgrade | Available |
| Display | 3.5 “QVGA (320 × 240) color TFT-LCD screen |
| Data transmission | It supports USB communication and transmits data to the computer. |
| Working temperature | -10℃～＋50℃; With special requirements, it can reach – 20 ℃; |
| Working voltage | Three No. 5 AA batteries are required. When the power is insufficient,
there is a low voltage prompt. |
| Overall dimension | 184 x 85 x 32 (mm) |
| Total Weight | 250 g(Without battery) |
| Standard Configuration | Main body,Coating thickness testing probe,Three No. 5 AA batteries,Manual,carrying case |
Optional Probes
Single
Element
probe | Model | Specification | Testing Range | Resolution |
| DTM15 (Standard) | 15MHz 6mm | 0.15-24 | 0.001mm |
| DTM7.5 | 7.5Mhz 6mm | 0.5-24 | 0.001mm |
| DTM10 | 10Mhz 6mm | 0.3-24 | 0.001mm |
| DTM5 | 5MHz 6mm | 1.0-24 | 0.001mm |
| BD510 | 5Mhz 10mm | 1-1000 | 0.001mm |
| BD212 | 2Mhz 12mm | 4-1800 | 0.001mm |
Dual
Element
Probe | TC400 | 10Mhz 5mm | 0.5-50 | 0.001mm |
| TC500 | 5 MHz 5mm | 1.0-65 | 0.001mm |
| TC510 | 5 MHz 10mm | 1.0-500 | 0.001mm |
