Overview
The Geonics PROTEM system consists of a 3 channel digital time-domain receiver, a TEM-47 battery powered transmitter and a 3D multi-turn receiver coil. Suitable for near-surface investigations between approximately 5 and 150m depth.
The GEF currently has 1 system available for loan. View our schedules to see equipment availability.
Specifications
Receiver
| Model | PROTEM 58 Digital Receiver |
|---|---|
| Power | Internal 12V rechargeable battery, 8 hours operation |
| Size | 34 x 38 x 27 cm |
| Weight | 15kg (incl. battery) |
| Measured Quantity | Time rate of decay of magnetic flux |
| Sensor | Three component orthoginal sensor, sequential |
| Time channels | 20 or 30 geometrically spaced time gates, 6us to 800ms |
| Repetition base (50Hz) | 0.25, 0.625, 2.5, 6.25, 25, 62.5, 247.5 Hz |
| Repetition base (60Hz) | 0.3, 0.75, 3, 7.5, 30, 75, 285 Hz |
| Synchronization | Reference cable |
| Integration time | 0.25, 2, 4, 8, 15, 30, 60 and 120 seconds |
| Calibration | Internal self-calibration |
| Gain | Manual control |
| Dynamic range | 29 bits (175 dB) |
| Storage | Solid state memory with capicity for over 3000 data sets |
| Display | 240 x 64 LCD |
| Data transfer | Serial RS232 |
| Operating temperature | -40 to +50 °C |
Transmitter
| Model | PROTEM 47 Transmitter |
|---|---|
| Power source | Internal 12V rechargeable battery, 5 hours @ 2A output |
| Size | 11 x 25 x 32 cm |
| Weight | 5.3kg |
| Output voltage | 0 to 9V continuously variale (@1A load) |
| Output current | 3.5A maximum (7A pk-pk) |
| Current waveform | Bipolar rectangular current with 50% duty cycle |
| Repetition rate (50Hz) | 25, 62.5, 237.5 Hz |
| Repetition rate (60Hz) | 30, 75, 285 Hz |
| Turn-off time | Very fast linear turn-off, 2.5us @ 2A into 40x40m loop |
| Transmitter loop | Any dimension from 5x5 to 200x200m. Multiturn loop possible |
Coil
| Model | 3D High Frequency (HF) |
|---|---|
| Effective area | 31.4 m2 |
| Bandwidth | 700kHz |
Accessories
Interpex IX1D Software
Performs forward and inverse modeling in terms of a layered earth with resistivity and optional IP parameter for most sounding methods (DC, FEM, TEM, MT, EM Conductivity).
Laptop
A laptop for field processing and downloading of serial data from the PROTEM.
3D receiver coil
Receiver coil with preamplifier. Measures 3 axes sequentially.
Transmitter loop
We supply a 5x5m multiturn loop and cable to make single turn loops up to 100x100m.
Packaging and shipping
The PROTEM system is very heavy (approx. 138kg in total) and is packaged into 3 aluminium containers.
Container 1 - 3D receiver coil
| Width | 38 cm |
| Depth | 34 cm |
| Height | 47 cm |
| Weight | approx. 28 kg |
Container 2 - transmitter loop cables
| Width | 53 cm |
| Depth | 64 cm |
| Height | 58 cm |
| Weight | approx. 50 kg |
Container 3 - Receiver, transmitter, laptop
| Width | 82 cm |
| Depth | 46 cm |
| Height | 64 cm |
| Weight | approx. 60 kg |
Courier to a UK destination
The GEF(Edinburgh) will ship loan items to the borrower by courier to UK addresses on a next day basis free of charge. It is the borrowers responsiblity to return the equipment to the GEF, on time and at their own expense via any suitable means.
Please note some GEF equipment uses Lithium Ion batteries. You may need to use a road based courier to return equipment to us, please contact us or see our guide to shipping lithium batteries for further information.
Collection from the GEF
Borrowers may collect and return equipment in person from the GEF offices (in Edinburgh and Leicester).
Shipping outside the UK
The GEF(Edinburgh) only ships to destinations within the UK. It is the borrowers responsibility to arrange transportation and all necessary customs paperwork for any temporary export and re-importation to the UK. You may arrange your own courier to collect equipment from our offices.
User training
New users of our GNSS equipment are required to be trained by Facility staff. Training usually takes place during a one day visit to the GEF offices. Previous users are encouraged to attend for refresher training.
Successful applicants will be invited to contact the Facility to arrange a suitable training date, usually close to the start of the project.
Training is free of charge, however applicants will be responsible for making their own way to the Facility.
Frequently asked questions
Do you supply batteries to power the PROTEM system?
Yes, GEF supplies internal rechargeable lead-acid gel batteries which power this system. The transmitter is supplied with two battery packs for extended operation time.