EM-V Series Specifications

EM-4V typical field uniformity

 Magnet configurationUniformity over 1 cm21% cylindrical volume
 Pole cap
mm (in)
Air gap
mm (in)
Diameter
mm (in)
Length
mm (in)
102 (4.0)51 (2.0)±0.15%18 (0.7)51 (2.0)
102 (4.0)25 (1.0)±0.05%64 (2.5)25 (1.0)
76 (3.0)25 (1.0)±0.06%46 (1.8)25 (1.0)
51 (2.0)25 (1.0)±0.35%18 (0.7)25 (1.0)
51 (2.0)13 (0.5)±0.16%36 (1.4)13 (0.5)

EM-7V typical field uniformity

 Magnet configurationUniformity over 1 cm21% cylindrical volume
 Pole cap
mm (in)
Air gap
mm (in)
Diameter
mm (in)
Length
mm (in)
51 (2.0)16 (0.6)±0.11%28 (1.1)16 (0.6)
51 (2.0)25 (1.0)±0.33%10 (0.4)25 (1.0)
102 (4.0)16 (0.6)±0.03%74 (2.9)16 (0.6)
102 (4.0)25 (1.0)±0.03%66 (2.6)25 (1.0)
102 (4.0)38 (1.5)±0.05%48 (1.9)38 (1.5)
102 (4.0)51 (2.0)±0.08%23 (0.9)51 (2.0)

NOTE: The third column gives uniformity over one cubic centimeter volume centered in the magnet gap. The last two columns give the cylindrical volume within which the magnetic field deviates by less than 1% from the central field. The cylindrical volume is coaxial with the magnet poles and centered in the gap.

General specifications

 EM-4VEM-7V
Air gapsWith no pole caps57.5, 62, 70, 75, 78, and 100 mm
 With 2 in pole caps7.5, 12, 20, 25, 28, and 50 mm
Coil resistance, nominal0.25 Ω per coil
(0.5 Ω total wired in series)
0.25 Ω per coil
(0.5 Ω total wired in series)
Coil resistance, cold0.23 Ω per coil
(0.46 Ω total wired in series)
0.23 Ω per coil
(0.46 Ω total wired in series)
Coil resistance, maximum0.27 Ω per coil
(0.54 Ω total wired in series)
0.27 Ω per coil
(0.54 Ω total wired in series)
Integrated pole diameter100 mm (4 in)178 mm (7 in)
Available pole cap diameters50 mm (2 in)100 mm (4 in) and 50 mm (2 in)
Cooling waterTap water or closed cooling system
Water flow rate7.6 L/min (2 gal/min)11.4 L/min (3 gal/min)
Pressure drop200 kPa (30 psi)220 kPa (32 psi)
Water chiller cooling capacity2.5 kW (8,530 BTU/h)5.0 kW (17,060 BTU/h)
Water inlet temperature15 °C to 25 °C (59 °F to 77 °F)
Coil over temperature limit45 °C (113 °F)
Coil spacing, nominal121 mm (4.75 in)178 mm (7 in)
Coil size-width, nominal121 mm (4.75 in)132 mm (5.2 in)
Coil size-diameter, nominal311 mm (12.25 in)445 mm (17.5 in)
Current (maximum continuous operating)±70 A±135 A
Voltage, nominal±35 V (approximately 38 V at maximum coil temperature)±70 V (approximately 38 V at maximum coil temperature)
Continuous input power, nominal2.5 kVA (2.65 kVA at max temperature)9.45 kVA (10.125 kVA at max temperature)
Suggested power supply Lake Shore Model 643Lake Shore Model 648
 Size
Height77 cm (30.3 in)52.7 cm (20.8 in)
Width78.7 cm (31 in)78.7 cm (31 in)
Depth88.9 cm (35 in)88.9 cm (35 in)
Weight201.9 kg (445 lb)635 kg (1400 lb)
Shipping weight215.5 kg (475 lb)660 kg (1500 lb)
Shipping dimensions0.97 m × 0.58 m × 0.56 m
(38 in × 23 in × 22 in)
0.86 m × 1.22 m × 1.19 m
(34 in × 48 in × 47 in)