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Fort
each other (switch on). And then magnetic
field disappears, the reeds separate and disconnect
(switch off).
Glass tube
Contact
Fe-Ni alloy reed
S
N
S
N
SE0202_OHD • 10/29/2018
2
Permeabi
3000
2000
1000
TC＝150
Saturation magneti
2000
1500
1000
500
0
TC＝90
TC＝60
TC＝30
TC＝120
TC＝150
Thermal Sensors – OHD Thermal Guard
0
0
20
40
60
80
100
120
140
160
0
20
40
60
80
100
120
140
160
Structures and Principles of Operation cont’d
TC=Curie temperature
Temperature ℃）
（
Temperature ℃）
（
Reed switch structure
• The reed switch is a contact switch
reed switch
of a pair of Fe-Ni alloy
Structure of
comprised
reeds encased in a glass
Reed switch is contact switch comprised of
switched
◆
tube with inactive gas. The reeds are
a pair of
on or off by the magnetic
Fe-Ni alloy
permanent magnet or magnet coil.
field of a
reeds encased in glass tube
with inactive gas. The reeds are switched on or
• The reeds in the glass tube become magnetized from the magnetic
off
by magnetic field of permanent magnet or magnet
field, allowing the two reeds to make contact and connect (switch on).
coil.
When the magnetic field disappears, the
High environmental
disconnect
◆
Long lifetime,
reeds separate and
resistance
because of protected contact by glass encasing.
(switch off).
◆
Reeds in glass tube become magnetized with
• The glass encasement of
magnetic field, and
high environmental
and
the reeds ensures
then two reeds contact
resistance and a long operational life.
connect each other (switch on). And then magnetic
TRS principle : Break (B) type
TRS principle : Break (B) type
Encasing
Glass tube
Inactive gas
Contact
Fe-Ni alloy reed
N
S
N
S
S
N
field disappears, the reeds separate and disconnect
(switch off).
OHD principle: Break (B) type
（
■
：Permanent magnet ■
：Thermorite
®
■
：Reed switch contact area ）
（
■
：Permanent magnet ■
：Thermorite
®
■
：Reed switch contact area ）
Reset temperature
Action temperature
Reset temperature
Action temperature
Thermal magnet = paramagnet
Thermal magnet = paramagnet
Low temperature
Low temperature
Thermal magnet = NO magnetic
Thermal magnet = NO magnetic
High temperature
High temperature
N
N
S
S
N
N
S
S
N
N
S
S
N
N
S
S
N
N
N
N
S
S
N
N
S
S
NEC TOKIN Sensors Vol.14 5
S
S
N
N S
S
N
N
Magnetic Flux Forming => Reed switch ON
Magnetic Flux Forming => Reed switch ON
＜Magnetic Field of Contact Part＞
＜Magnetic Field of Contact Part＞
S
N
●All specifications in this catalog and production status of
N
products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
S
N S
S
S
N
S
N S
●Please request for a specification sheet
N
detailed product data prior to the purchase.
for
S
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
＜Magnetic Field of Contact Part＞
＜Magnetic Field of Contact Part＞
Magnetic Flux ≒0 => Reed switch OFF
Magnetic Flux ≒0 => Reed switch OFF
S
S
N
N
S
S
2015.3.31 0000SENVOL14E1503H1
N
N
Switch ON
Switch ON
Switch OFF
Switch OFF
TRS principle : Make (M) type
TRS principle : Make (M) type
OHD principle: Make (M) type
（
■
：Permanent magnet ■
：Thermorite
®
■
：Gapspacer（SP） ：Reed switch contact area ）
■
（
■
：Permanent magnet ■
：Thermorite
®
■
：Gapspacer（SP） ：Reed switch contact area ）
■
Reset temperature
Action temperature
Reset temperature
Action temperature
Thermal magnet = paramagnet
Thermal magnet = paramagnet
Low temperature
Low temperature
Thermal magnet = NO magnetic
Thermal magnet = NO magnetic
High temperature
High temperature
N
N
S
S
N
N
S SP N
S SP N
S
S
N
N
S
S
N
N
S
S
N
N
S
S
N
N
S
S
S
S N
N
N
N
S
S
N
N
S
S
N
N
S
S
N
N
S
S
N
N
S SP N
S SP N
S
S
N
N
S
S
＜Magnetic Field of Contact Part＞
＜Magnetic Field of Contact Part＞
Magnetic Flux ≒0 => Reed switch OFF
Magnetic Flux ≒0 => Reed switch OFF
＜Magnetic Field of Contact Part＞
＜Magnetic Field of Contact Part＞
N
N
S
S
N
N
S
S
Switch OFF
Switch OFF
6 NEC TOKIN Sensors Vol.14
6 NEC TOKIN Sensors Vol.14
Switch ON
Switch ON
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●All specifications in specification sheet for detailed product data prior subject to change
●Please request for athis catalog and production status of products are to the purchase. without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet please read "Precautions" and other safety precautions listed in the printed version catalog.
●Before using the product in this catalog, for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
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Embedded System
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