Magnetic Shield Cases
Magnetic Shield Cases E989 Series
Photomultiplier tubes are extremely sensitive to magnetic fields and exhibit
output variations even from sources such as terrestrial magnetism.
Hamamatsu E989 series magnetic shield cases are designed specifically
to protect photomultiplier tubes from the influence of such magnetic fields.
The E989 series uses permalloy, a material that has an extremely high per-
meability (approximately 10
5
). The magnetic field intensity within the shield
case can be attenuated from 1/1000 to 1/10000 of that outside the shield
case (this ratio is called the shielding factor). The E989 series ensures a
stable output for photomultiplier tubes operating in proximity to magnetic
fields.
TACCF0093
Features
G
Made of high-permeability permalloy (Ni: 78 %, Fe and others: 22 %)
G
Various sizes available with inner diameters from 12 mm to 138 mm
G
Lusterless black paint finish
Specifications
Photomultiplier Tube Diameter
13 mm (1/2")
Side-on
28 mm (1-1/8") *
10 mm (3/8")
13 mm (1/2")
19 mm (3/4")
25 mm (1")
28 mm (1-1/8")
Head-on
38 mm (1-1/2")
51 mm (2")
76 mm (3")
127 mm (5")
Type No.
E989-10
E989
E989-28
E989-09
E989-02
E989-39
E989-03
E989-04
E989-05
E989-15
E989-26
Internal Dia. D ( mm) Thickness t (mm) Length L (mm)
47
±
0.5
14.5
0.5
80
±
1
33.6
±
0.8
0.8
48
±
0.5
12
±
0.5
0.5
75
±
0.5
16
±
0.5
0.8
95
±
1
23
±
0.5
0.8
48
±
0.5
29
±
0.5
0.8
120
±
1
32
±
0.5
0.8
+1
100
±
1
44
-0
0.8
+1
130
±
1
60
-0
0.8
+1.5
120
±
1
80
-0
0.8
170
±
1
138
±
1.5
0.8
Weight (g)
10
66
9
28
50
32
90
102
180
200
600
* Photomultiplier tubes with HA coating extending to the base portion cannot be used. Please consult our sales offices for details.
Dimensional Outlines
(Unit: mm)
E989
120°
E989-02 to -05, -09*, -39*
120°
E989-10
90
°
E989-15
°
90
E989-26
12
40
10
E989-28
3-No.5
40UNC
22.0
±
0.3
18.0
±
0.1
2- 2.3
6
0
°
R35.0
±
0.5
12
0
°
12
0
°
0
°
12
90
°
47.0
±
0.5
26
80
±
1
3-M2.6
37
5
*
3-
3.5
60.0
±
1.5
10
10
68.0
±
1.5
10
*
No
mounting hole is provided for
E989-09 and E989-39.
TACCA0118EA
TACCA0119EC
TACCA0120EC
TACCA0121EC
TACCA0122EC
TACCA0117EB
106
1
4- 4
120
±
1
24
L
0.5
45
°
170
±
1
10
48.0
±
0.5
23
50
12
0
°
14.5
D
t
0.5
5
80.0
+1.5
-0
0.8
138.0
±
1.5
12
0
°
12.0
±
0.5
0.5
°
90
33.6
±
0.8
8
0.8
0.8
Talking
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