Firma:              Varian

Modell:                         EM 360L

Kommentar:     Dokumente engl.

A 60-MHz high-resolution NMR spectrometer offering exceptional reliability,versatility, and ease-of-use

Exceptional ease-of-use and out­standing reliability are the hallmarks of Varian's EM-Series of routine 60-MHz spectrometers.

With thousands of EM spectrometers already installed, Varian CW instruments are the standard of the industry for routine spectrometers, with an unmatched Per­formance record for reliable operation.

Varian's EM-360L, the most recent in a long line of highly-regarded routine spectrometers, is designed to meet today's needs in which a 60-MHz NMR system satisfies the application. The EM-360L provides a wide selection of advanced performance features as standard, and also offers an array of accessories to.meet the varied needs of today's chemists.

Whether your application involves organic structure analysis, quantitative analysis of mixtures, identification and control of impurities, quality assurance, teaching, or providing support instru­ments for higher field spectrometers, the EM-360L is today's spectrometer of choice for your laboratory.

Standard Features

• Sensitivity ≥ 30:1

(1% ethylbenzene test)

• Resolution ≤ 0.3 Hz (FWHM)

• 14-kG permanent magnet (needs no cooling water)

• Built-in 11 x17-inch Y-T flatbed recorder

• Pneumatic sample insert and ejection

• VT-compatible probe with spin rate tachometer

• Built-in internal lock/decoupler with­AutoShim"w (automaticY-gradient homogeneity correction)

• Wide range of sweep widths (0.2 to 100 ppm)

• Wide range of field offsets (-200 to +200 ppm, digitally selectable)

• 25-kHz modulation with single­sideband detection

• Fast normalization of spectrum and integral amplitudes­

• Wide frequency range (±5000 Hz) in homonuclear lock and decoupling channels

Optional Features

• Spin decoupler (including provisions for spin tickling and INDOR)

• Variable-temperature operation (-100° to +175°C; Joule-Thomson cooling with nitrogen or argon gas)

• ¹⁹ F observation at 56.4 MHz

• ³¹ P observation at 24.3 MHz

Specifications

Magnetic Field Strength

14.092 kilogauss

Standard Operating Frequency

60 MHz ( ¹ H)

Sample Tube Size

5-mm o.d., 4.2-mm i.d.

Typical Sample Volume

0.4 cc

Sensitivity

≥ 30:1 signal-to-average-noise ratio on the largest peak in the methylene quartet of a 1% (v/v) ethylbenzene solution

Resolution

≤ 0.3 Hz full linewidth at half maximum amplitude

Line Shape

15 Hz at 0.55% amplitude level

40 Hz at 0.11 % amplitude level

Average RF Field at Sample

0.005 to 0.5 milligauss, continuously variable

Field Stability

Locked: ≤ 0.2 Hz in a 5-minute scan

Unlocked: ≤ 1 Hz in a 5-minute scan

Resolution Stability

Linewidth will not degrade by more than 0.6 Hz/day (without AutoShim)

Integral Reproducibility

Average deviation ≤1.5% for five consecutive scans of a 5% (v/v) ethylbenzene solution

Sweep Widths

0.2, 0.5, 1, 2, 5,10, 20, 50, and 100 ppm

Sweep Times

0.5, 1, 2, 5, 10, and 20 minutes

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

Flatbed Y-T Recorder

Platen Size: 11 x 17 inches (28x43 cm)

Chart Size:11 x 16.5 inches (28x42 cm)

Writing Grid: 200x340 mm

Pen Response: 0.75 second full scale, vertical travel

Linearity: 0.35%

Chart Calibration Accuracy: ±0.2% full scale

Ambient Temperature Requirements

18°C to 32°C with a maximum variation of ±3°C over 24 hours

Utility Requirements

Line Voltage: 115 or 220V, 50 or 60 Hz

Power: 260 watts maximum

System Weight

Magnet Console: 600 pounds (270 kg)

Control Console: 100 pounds (45 kg) (including stand)

Physical Dimensions (D x W x H)

Magnet Console: 28x31x31 inches (71 x 79x 79 cm)

Control Console: 24.3x37x38 inches (62 x 94 x 96 cm) (including stand)

Variable Temperature Accessory

Range: -100° to +175°C, digitally selectable

Accuracy: ±2.5°C

Resettability: ±1°C

Stability: ±0.5°C

Cooling Method: Joule-Thomson gas expansion

Minimum Pressure for -100°C: 1400 psi using nitrogen; 1000 psi using argon

Typical Gas Flow Rate: 20 cfh or less

Spin Decoupler Accessory

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

Flourine Observation Accessory

Operating Frequency: 56.4 MHz

Sensitivity: ≥ 20:1 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

Operating Frequency: 24.3 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.