Time domain electro-magnetic instrument PROTEM57 – MK21
1. Functions: Time domain electromagnetic measurement (transfer field) for mineral investigation and assessment; Looking underground water; Engineering geology.
2. Manufactured by: GEONICS LIMITED, Canada
3. Year of production: 2002
4. Webiste: https://www.geonics.com
5. Specification
a. Receiver PROTEM:
Measured quantities Rate of decay of magnetic field along 3 axes, in nV/m2
Channels 1 channel used sequentially for 3 components; optionally, 3 channels for 3-component simultaneous operation
Time gates 20 gates or 30 gates
Dynamic range 23 bits (132 dB)
Base frequency 0.3, 0.75, 3, 7.5, 30, 75 and 285 Hz, or 0.25, 0.625, 2.5, 6.25, 25, 62.5 and 237.5 Hz
Integration time 0.5, 2, 4, 8, 15, 30, 60 or 120 s
Display 240 x 64 dot graphic LCD
Data handling Solid-state memory for 25,000 data records
Data output RS-232 serial, USB ports
Synchronization Reference cable or, optionally, highly stable quartz crystal
Power supply 12 V rechargeable battery for 8 h continuous operation
Operating temperature -40° C to +50° C
Dimensions 34 x 38 x 27 cm
Weight 15 kg
b. Transmitter TEM 57 – MK2:
Current waveform: Bipolar rectangular current with 50 % duty cycle
Base frequency 0.3, 0.75, 3, 7.5, or 30 Hz (60 Hz power line frequency)
0.25, 0.625, 2.5, 6.25, or 25 Hz (50 Hz power line frequency)
Turn-off time 20 to 115 µs, depending on size, current and number of turns
in transmitter loop
Transmitter loop Single turn: any dimension; minimum resistance is 0.7 ohms, up to 300 x 600 m 8-turn: 5 x 5 or 10 x 10 m
Output voltage 18 to 60 V continuously adjustable; up to 160 V (4,500 W)
with external power source
Output current 28 A maximum
Synchronization Reference cable or, optionally, highly stable quartz crystal
Power source 1,800 W, 110/220 V, 50/60 Hz single-phase motor-generator or, optionally, multiple 12 V batteries
Operating temperature -35° C to +50° C
Transmitter protection Electronic and electromechanical protection
Transmitter size 43 x 25 x 25 cm
Transmitter weight 15 kg
6. Some projects used Electro-magnetic PROTEM57 – MK2 by Geophysical Division.
– Project: Detail investigation of aviation magnetic anomalous bands in Cao Bang – That Khe area to look for iron ores;
– Project “Surveying and forecasting Karst caves in the C2-P-1 age of marble strata by geophysical methods in Thach Khe iron mine – Ha Tinh”.
– Project: “Investigation and detail Investigation aviation magnetic anomalous bands in the area of Thuong Giap, Tuyen Quang province”.
– Science and technology topic: “Research on the application of electromagnetic methods to investigation and detect underground water at great depths in some areas of Ninh Thuan and Binh Thuan provinces “;
– Investigation engineering geology for building Ninh Thuan 1 Nuclear Power Plant;
And many other work.
Nguồn: Geophysical Division./.
