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VARIAN EM 390 H1 Observe Spectrometer
(Permanent Magnet)


  • Easy-to-use and Low Cost instrument.
  • Ideal for routine analyses and R&D laboratories.
  • High Stability.
  • Compact Probe.
  • Gradient Field adjust and Shim Coil Controls.
  • Extra Shim contronls (xy2 & x2).
  • Lock Channel.
  • Decoupler.
  • H1 or P31 versions (or both upon request).
  • Sensitivity ≥ 60:1 (1% ethylbenzene test sample)
  • Resolution ≤ 0.4 Hz (ODCB test sample)
  • 21 kG permanent magnet (needs no cooling water)
  • Built-in 11 x17-inch Y-T flatbed recorder at desk height.
  • Pneumatic sample handling.
  • VT-compatible probe with spin rate tachometer.
  • Built-in internal lock/decoupler with AutoShim (automaticY-gradient homogeneity correction)
  • Can operate with internal or external lock or in normal mode.
  • Wide range of sweep widths (0.2 to 100 ppm) and field offsets (-200 to +200 ppm, digitally selectable)
  • 25-kHz modulation with single­sideband detection
  • Magnet with temperature compensation to ensure field stability.
  • Fast normalization of spectrum and integral amplitudes
  • Wide frequency range (±5000 Hz) in homonuclear lock and decoupling channels
  • Kit shipped with instrument (see list below).


Observable Nuclei Hydrogen (Proton) Standard
H0 Field Strength 21.140 kG
H1 Rotating Field Frequency 90.0 MHz (for proton resonance)
Sample Size 5-mm O.D
Typical Sample Volume 0.4 mL
Resolution (Use ODCB 7th or 14th line). Under optimum homogeneity conditions, the full linewidth at half amplitude with a spinning sample is 0.4 Hz or better
Resolution Stability 0.5 Hz degradation/8 hrs without Autoshim control

less than 5% baseline rise on ODCB

Sensitivity Proton: sufficient to detect the average of the two peaks in the quartet of a 1% ethylbenzene sample with a S/N of 60:1 homogeneity, filter, and H1 conditions prevailing
Spinning Side Bands 2.5% or less than the center or main line peak height (measured at 50 rps)
Integration Reproducibility Using 5% ethylbenzene sample for five successive scans of the spectrum, the average deviation in total integral reproducibility should not exceed 2 %
System Stability (Short Term Field Stability)

Unlocked: 2 Hz /5 minutes at constant temperature

Locked: 0.2 Hz /5 minutes at constant temperature

Average RF Field at Sample 0.005 to 0.5 milligauss, continuously variable
Field Offset Range ±200 ppm digitally selectable (includes 0-1 ppm continuous vernier)
Internal Lock/Decoupler Range ±5000 Hz from observing channel
Modulation Frequency 25 kHz (single sideband detection)
Filter Time Constants 0.05, 0.1, 0.2, 0.5, 1, 2, and 5 seconds
Recorder and Sweep Unit Y axis Response: < 750 msec full scale
Linearity: 0.35%
Chart Size: 28cm x 42 cm (11''x16.5'')
Chart Calibration Accuracy: ±1Hz at 600 Hz sweep width
Sweep Times 0.5, 1, 2, 5, 10, 20 min
Sweep Ranges 0.2, 0.5, 1, 2, 5, 10, 20, 50, 100 PPM
Ambient Temperature Range 18° C to 32° C with maximum variation of ±3° C change over 24 hrs
Power Supply Line Voltage:        115 or 220 V, 50 or 60 Hz
Power:                 260 watts maximum
Protection Fuse 1.5 A at 250 V
2.0 A at 115 V
System Weight

Magnet Gross weight:          952 kg (2100 pound)
Console Gross weight:         45 kg (100 pound)

Dimensions Magnet:  85 x 104 x 87 (cm) / 33 x 41 x 34 (in)
Console:  24.3 x 37 x 38 inches / 62 x94 x96 cm

ACCESSORIES (Upon Request)

  • Variable Temperature Accessory
    EM 3940

Range: -100° to +175°C, digitally selectable
Accuracy: ±2.0°C
Resettability: ±1°C
Stability: ±0.5°C
Cooling Method: Joule-Thomson gas expansion
Min. Pressure for -100°C: 1400 psi using nitrogen; 1000 psi using argon
Typical Gas Flow Rate: 20 cfh or less

  • Spin Decoupler Accessory for  double resonance
    EM 3930
Operating Modes: Frequency sweep decoupling, Spin Tickling, INDOR
Decoupling Field at Sample: 0.08 to 8 milli­gauss, continuously variable (0.008 to 0.8 milligauss for spin tickling and INDOR)
Offset Range: ±5000 Hz from observing channel
Frequency Stability: ≤ 0.2 Hz in 5-minute scan
  • Fluorine Observation Accessory
Observable Nuclei: F19
Operating Frequency: 84.67 MHz
Sensitivity: ≥ 35:1 signal-to-average-noise ratio on the outer lines of the multiplet in a 0.75% (v/v) solution of 1.2-dibromo-1, 1-difluoroethane.
  • Phosphorus Observation Accessory
Observable Nuclei: P31
Operating Frequency: 36.44 MHz
Sensitivity: ≥ 10:1 signal-to-average-noise ratio on the 2nd and 9th lines of the multi­plet in a neat sample of trimethyl phosphite
  • AIR Pump
Original compressor + filter. Regulator, pressure indicator, muffler + fittings.
  • Kit coming with instrument
2 pen groommet & 1 pen holder
1 Anamag. Shim screwdriver
1 turbine 5mm
1 Manual Spectrometer System
100Sh. Chart Paper

 CONTACT FOR FREE  INFO AND QUOTATIONS: admin@labusednmr.com and/or rbpnmr@libero.it
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