NMR20 GAUSSMETER

The NMR20 is the new model from the famous Gaussmeter NMR 2 (Drusch). Technology approved for more than 37 years.

CAYLAR proposes a measurement of the magnetic field by Nuclear Magnetic Resonance (NMR) which makes an absolute measurement of the magnetic field, with resolution of 1 mG (0.1 μT) without influence of temperature.

The NMR20 gaussmeter have the characteristic of measuring weak fields from 140 G (14 mT) up to 13 T.

CAYLAR NMR probes offer a high measurement dynamic (minimum ratio 5).

Possibility to measure fields from 14 mT to 13 Tesla with only 6 probes. And from 14mT to 2.1T with only 3 probes.

GAUSSMÈTRE NMR20

Field range 0.014 – 13 T
with Hall sensor, down to 0 and with sign indication
Resolution 0.1 µT (1 mG)
Absolute precision < 5 µT
Relative precision < ± 0.5 µT
Internal clock stability ± 1 ppm (0°C – 70°C)
Internal clock aging 1st year < 1 ppm
Clock Aging after 1 year < ± 0,2 ppm / an
Sampling 2 Hz
Sampling 170 – 1000 ppm / cm
NMR Field time tracking rate ( Auto mode on full range) 1 à 32 s
< 1 s with Hall Option
NMR Field time tracking rate (Auto mode on 5% range) < 3 s if field is approximately known
NMR signal access Analog output with synchronisation signal
Channels 1 to 256 (possible extension)
Distance 300 meters
Control by external PC TCP / IP, MODBUS, RS232

optionOption 1 : Hall sensor chain
optionOption 2 : 5 % range tracking
optionOption 3:  Field Regulation ( FR020 NMR Field regulator )
NMR System with NMR20 gaussmeter

NMR20 Gaussmeter Description

Based on the principle of nuclear magnetic resonance the CAYLAR NMR20-Gaussmeter measures magnetic fields from 0.014 T to 13 Tesla with an absolute accuracy better than 0.5 µT.

There is no temperature drift.

The probe which contains a small amount of resonant material is placed inside the magnetic field to be measured. The resonant material is excited by a wideband variable high frequency signal.

For a frequency depending only on the magnetic field, an absorption resonance is generated.

The value of the magnetic field in is deduced from the measurement of this resonance frequency.

This method does not generate any perturbation signal, because the energy in the probe is very low at the opposite of a pulsed measurement system.

It is possible to connect the gaussmeter to an oscilloscope to visualize the RMN signal.

CAYLAR gaussmeter integrate Ethernet (TCP or MODBUS) and RS 232 interfaces for computer monitoring.

The measurement can be performed according different methods :

  • Manually
  • Automaticaly on full probe range
  • Automaticaly fast scan tracking with 5 % target zone predefined, reading within 3 seconds
  • Automaticaly Hall scan tracking, reading within 1 second

CAYLAR propose its NMR gaussmeter in two versions: a 19″ rack or portable type.

The both version can be connected to a multiplexer, whereby it is possible to switch between several probes and control the probe selection through the gaussmeter.

To minimise the number of probes in customer systems, CAYLAR NMR probes have a range of 5. This means that the maximum field measurement of a probe is approximately 5 times the minimum field.

Examples: 0.3 T to 1.5 T , 0.42 T to 2.1 T

For more details see the page NMR Principle

Probe Range / Probe Case

Probes Range Case A
20 x 10 x 160 mm
Case B
20 x 6 x 160 mm
Case C
8 x 6 x 160 mm
0.0140 – 0.0850 T
0.0200 – 0.1000 T
0.0400 – 0.2000 T
0.0500 – 0.2500 T
0.0600 – 0.3000 T
0.0800 – 0.4000 T
0.0900 – 0.4500 T
0.1600 – 0.08000 T
0.1700 – 0.9000 T
0.24001.2000 T
0.30001.5000 T
0.45002.1000 T
2.00005.0000 T
4.00009.0000 T
6.000013.0000 T
Option 1 HALL
Option 2 Sample 11cm  20 x 10 x 270 20 x 6 x 270 8 x 6 x 270
Option 3 Head Sample 40cm 20 x 10 x 30 20 x 6 x 30 8 x 6 x 30

optionOption 1 : Hall sensor for fast locking
optionOption 2 : Option deported sample sensor 11 cm from the electronic
optionOption 3:  Option deported head sample sensor 40 cm from the electronic by a flexible cable
Probe Case A16

Probe Case A16

Probe Case C16

Probe Case C16

Preamplifiers

Preamplifier Probes Channels Dimensions
PA-MUX 1 1 probe 120 x 80 x 36,5 mm
PA-MUX 2 2 probes 120 x 80 x 36,5 mm
PA-MUX 3 3 probes 120 x 152 x 36,5 mm
PA-MUX 4 4 probes 120 x 152 x 36,5 mm
PA-MUX 8 8 probes 120 x 310 x 36,5 mm

optionOption 1 : HALL Electronic
PAMUX1 Preamplificateur Sonde RMN

Switch Multiplexer

Switch Preampliers channels
SW 2 2 channels
SW 3 3 channels
SW 4 4 channels
SW 5 5 channels
SW 6 6 channels
SW 7 7 channels
SW 8 8 channels
Dimensions Rack 19’’ 2 U-Depth 320 mm

optionOption 1 : HALL Electronic
SWITCH MULTIPLEXEUR
Secured By miniOrange