Mae WCH-4

Geotechnical instrumentation

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Frosolone, Italy
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Geotechnical instrumentation

WCH-4 introduces a new concept of device for cross-hole surveys on foundation poles. More than an equipment in its traditional sense, WCH-4 is a modular wireless device for foundation pole cross-hole surveys and its core are the motorized electronically controlled reels on which are mounted high power probe holes for cross-hole surveys on foundation poles, diaphragms, and all cement or concrete infrastructural works which can be tested by cross-hole methodology, that is sloping down through pipes specially arranged when thrown and then filled with water.
Each reel of WCH-4 system is equipped with a 60 mt cable motorized probe, and with all the electronics which automatically manages the probe during the descent / ascent of the probes (cross-hole) and data saving.
Due to Panasonic Rugged Tablet 10.4", and the almost total lack of material wiring, settings, measures management in addition to display and interpretation of the data acquired is easy and immediate. In the direct analysis mode each wave emitted by the inner generator is fully displayed  and it is also possible to change display parameters to further facilitate reading of the crossing speed and the presence of defects in the material investigated.

Further info from manufacturer on WCH-4
Further details
By using 2-3-4 WCH-4 wireless motorized reels with automatic simultaneous handling it is possible to obtain an exponential saving of the time required for the survey, because with a single ascent / descent of the probes inside the pole to be checked (which must be instrumented with 2-3-4 pipes) it is possible to get the corresponding sections.
- Completely wireless management with setting of all functions through tablet
- System easily usable by a single operator
- Easily transportable by plane in a single small suitcase provided with trolley
- User-friendly software guided step-by-step
- Modular system, 2 reels basic system + 1 or 2 channels expansion options

The data acquired at each pulse are displayed in real time on tablet monitor allowing immediate display of any imperfections of the investigated structure. Cross-hole surveys procedure with 2- 3.4 channels is managed in a fully automatic way. The only activities required to the operator are those regarding positioning the encoders to read the position of motorized probes on tubes arranged for the survey and the initial alignment of the probes on the pole hedge. Once completed this activities, data acquisition, which is handled automatically by the system, it is started by simply pressing a button. It is possible to check the data as soon as they are acquired so as to control in real time the progress of the test. It is possible to immediately print the test report containing data of the survey just carried out directly on site.
Normative compliance: ASTM D6760-08
- Time basis: 100ns, 200ns, 500ns, 1μs, 2μs, 5μs, 10μs, 20μs
- Sample resolution: 12 bit
- Samples per event: 2048
- Amplification factors: x1, x2, x4, x5, x8, x10, x16, x32
- Band width: 50 Mhz
- Filter for ultra-sounds: central frequency 50 kHZ

- From hole: resonant frequency 52 kHz, diameter 35mm
- Excitation peak voltage: 500V (normal), 2000V (high)
- Maximum frequency for pulse emission: 1 per second
- Minimum measurement pitch: 10mm
- Motorised reels: no. 2,3 or 4 with 60 metres of cable
- Encoder position: n. 2,3 or 4, precision 1,4°
- Speed and alignment: managed automatically
- Hardware buttons to operate engines
- Automatic switching for ultrasounds transmitting/receiving

General data:
- Total control by Android palmtop through owner’s app
- Normative compliance: ASTM D6760-08
- Wireless technology: Wifi – 2.4 Ghz – 802.11b
- Wireless synchronization: 5 Ghz band, 8 channels available
- Radio channel selection: automatic
- Power supply: 12V DC, 1 battery Li-Ion of 10,5 Ah for each reel
- Average absorption (for each reel): 180mA (standby) – 600mA (while taking measurements)
- Data format: owner
- Diagraphics processing software: compatible with Microsoft Windows operating system
- Environmental operating conditions: -20/80 °C
- Single unit sizes: L220 x H225 x P250 mm
- Single unit weight: 9,3 kg

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