Page 136 - 诺霸英文2022

ULTRASONIC MEASUREMENT

USM-3

Hire 9 40334 USM-3 instrument with AC adaptor, nylon case, storage case, transducer
USM-3 ULTRASONIC STRESS METER
Only
cable, RS-232 cable, couplant and manual

Magnetic Transducers - This standard style is used with ferrous materials,
and consists of a rare earth magnet surrounding the piezo electric
transducer�

Ultrasonic 9 TRANSDUCERS
measurement 56016 3 ∕ 16" 5 MHz Magnetic Transducer
provides a very 56017 3 ∕ 16" 7.5 MHz Magnetic Transducer
precise method 56018 3 ∕ 16" 10 MHz Magnetic Transducer
of determining the 56009 1 ∕ 4" 5 MHz Magnetic Transducer
elongation of a fastener 56019 1 ∕ 4" 10 MHz Magnetic Transducer
due to tightening. This 1
elongation is proportional to the load force generated by the fastener. 56011 ∕ 2" 2.25 MHz Magnetic Transducer
56010 1 ∕ 2" 5 MHz Magnetic Transducer
The basic principle behind this method of tension control is 56020 3 ∕ 4" 1 MHz Magnetic Transducer
similar to sonar. The ultrasonic measurement of bolt tension 56013 3 ∕ 4" 2.25 MHz Magnetic Transducer
is achieved by introducing a sonic pulse at one end of the 56012 3 ∕ 4" 5 MHz Magnetic Transducer
fastener and accurately measuring the time of flight (TOF) 56021 Glue on, 3 mm square, 7.5 MHz, pack of 100
required for the echo to return from the opposite end. Using Operating temperature limit for transducers is 55°C. Contact Norbar for
material constants, the USM-3 converts this TOF into an details of high temperature transducers with a temperature limit of 175°C.
'acoustic length' of the fastener, providing a baseline from
which future measurements will be made. When the fastener 9 TRANSDUCER LEADS
is tightened: the TOF increases and the USM-3 will again 60235 Transducer Lead 10’ (approx 3 m)
utilise material constants to eliminate the effects of stress and 60236 Transducer Lead 20’ (approx 6 m)
temperature variations on sound velocity, providing an accurate Q2408 Probe for glue on Ultrasonic TD's
elongation or load measurement.
The USM-3 uses state of the art hardware and digital signal 9 SPARES & ACCESSORIES
processing to achieve these measurements with maximum 61112 Ultrasonic Couplant Bottle 4 oz (approx 0.12 litres)
automation, minimizing the need for operator interpretation. 61116 Serial Lead 6’ DB9 M to DB9 F
Once measurements have been recorded to the USM-3 61117 Length Bar Set 3" & 6" with certificate
internal memory, the included SonicBolt software will transfer 60271 Digital Thermometer (Accuracy ±0.5°C / ±1°F)
the data to a computer for backup of files, creation of project
reports, and conversion of
data to Excel format for further Model USM-3
analysis. In addition, the analogue Part Number 40334
signal output can be used to
automatically shut-off powered Dimensions A 53
torque and tensioning tools based (mm) B 240
on elongation or load, in even the C 180
most demanding applications. Weight (kg) 2�3

Ultrasonic Transducer

Time of Flight
UNTIGHTENED Pulse Echo Pulse Echo
Time of Flight
TIGHTENED

Measured
Time Change

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