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Specialists in Teslameters, Gaussmeters & Distributed Control Systems

Teslameter / Gaussmeter Probes

For Group3 Digital Hall effect Teslameters

There are two main families of probes manufactured by Group3.

  1. LPT series - the standard probe

    • sensitive area 1.6 x 4.0 mm
    • housed in a probe head of 13 x 10.5 x 2.5 mm thick (LPT-130 and LPT-230)
    • 14 x 14 x 2.5 mm thick (LPT-141 and LPT-231)

  2. MPT series - miniature probe

    • sensitive area 1.0 x 0.5 mm
    • housed in a probe head of 14 x 5 x 2 mm thick

Within these families there are probes of differing full scale ranges, the standard maximum range is 3.0T, the high sensitivity probe has a maximum field of 0.3T

Every Group3 probe is individually characterised at many hundred field values, each at a range of temperatures. All this data is analysed by the calibration computers and the resulting correction coefficients stored in the probe itself. Because the characterisation data for each probe is permanently stored within the probe plug housing itself, any Group3 probe can be used with any Group3 instrument. Probes and instruments can be swapped around while still maintaining the full accuracy of the system.

For full accuracy over a range of temperatures the DTM-151 should be used with the following probes:

  • LPT-141
  • LPT-231
  • MPT-141
  • MPT-231

Probe cables

  • Probe cables can be ordered in any length up to 30m.
  • Unshielded cable has a diameter of 4.5mm.
  • Shielded cable has a diameter of 6.3mm
  • The probe head is usually on the end of a short (10 to 50mm) length of twisted but unjacketed wires. This allows greater flexibility when mounting the probe head.
  • Various special configurations of probe head have been manufactured to special customer requirements - if one of the existing types of probe is not suitable for your application, please contact your Group3 representative.
  • The operating temperature range of the probe and instrument is 0 to 50 ° C
  • A range of probe holders is available for both series of probe heads. One, two and three axis probe holders have been manufactured in aluminum and non-metallic materials.
  • A printed booklet of the individual characterisation tables for that particular probe is supplied.
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Probes

LPT series performance standard sensitivity
Probe Probe head size (mm) active area (mm) Max field Accuracy at 25° C Tempco ppm /°C zero drift µT/°C
LPT-141 14 x 14 x 2.5 4 x 1.6 3T ± 0.01% ± 5 ± 1
LPT-130 13 x 10.5 x 2.5 4 x 1.6 3T ± 0.03% -60 ± 12
LPT series performance High sensitivity
Probe Probe head size (mm) active area (mm) Max field Accuracy at 25° C Tempco ppm /°C zero drift µT/°C
LPT-231 14 x 14 x 2.5 4 x 1.6 0.3T ± 0.03% ± 20 ± 1
LPT-230 13 x 10.5 x 2.5 4 x 1.6 0.3T ± 0.03% -600 ± 8
MPT series performance Standard sensitivity
Probe Probe head size (mm) active area (mm) Max field Accuracy at 25° C Tempco ppm /°C zero drift µT/°C
MPT-141 14 x 5 x 2 1 x 0.5 3T ± 0.01% ± 5 ± 1
MPT-132 14 x 5 x 2 1 x 0.5 3T ± 0.03% -80 ± 40
MPT series performance High sensitivity
Probe Probe head size (mm) active area (mm) Max field Accuracy at 25° C Tempco ppm /°C zero drift µT/°C
MPT-231 14 x 5 x 2 1 x 0.5 0.3T ± 0.03% ± 20 ± 1
MPT-230 14 x 5 x 2 1 x 0.5 0.3T ± 0.03% -600 ± 8

Other Teslameters

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