field disappears, the reeds separate and disconnect
(switch off).
SE0201_TRS • 3/27/2017
2
Perm
Saturation ma
1500
1000
500
0
TC＝90
TC＝60
TC＝30
TC＝150
2000
1000
0
TC＝120
Sensors – TRS™ Series Thermal Reed Switch
0
20
40
60
80
100
120
140
160
0
20
40
60
80
100
120
140
160
Temperature ℃）
（
Temperature ℃）
（
Structures and Principles of Operation cont’d
Reed Switch Structure
Structure of reed switch
• The reed switch is a contact switch comprised of a
comprised of a
alloy
◆
Reed switch is contact switch
pair of Fe-Ni
pair of
reeds encased in a glass
Fe-Ni
with inactive gas.
in glass tube
are switched
tube
alloy reeds encased
The reeds
on or off by the magnetic
with inactive gas. The reeds are switched on
coil.
field of a permanent magnet or magnet
or off
by magnetic field of permanent magnet or magnet
• The reeds in the glass tube become magnetized from the magnetic field,
coil.
allowing the two reeds
◆
Long lifetime,
and connect (switch on). When
to make contact
High environmental resistance
because of protected contact by glass encasing.
the magnetic field disappears, the reeds separate and disconnect (switch
◆
Reeds in glass tube become magnetized with
off).
magnetic field, and then two reeds contact and
• The glass encasement of
connect each other (switch on). And then magnetic
the reeds ensures high environmental
field disappears,
resistance and a long operational life.
the reeds separate and disconnect
(switch off).
Encasing
Glass tube
TC=Curie temperature
Inactive gas
Contact
Fe-Ni alloy reed
N
S
N
S
S
N
TRS principle : Break (B) type
TRS principle: Break (B) type
Reset ：Reed switch
Action temperature
（
■
：Permanent magnet ■
：Thermorite
®
■temperature contact area ）
Reset temperature
Action temperature
TRS principle : Break (B) type
（
■
：Permanent magnet ■
：Thermorite
®
■
：Reed switch contact area ）
Low temperature
Low temperature
Thermal magnet = paramagnet
Thermal magnet = paramagnet
High temperature
High temperature
Thermal magnet = NO magnetic
Thermal magnet = NO magnetic
NEC TOKIN Sensors Vol.14 5
N
N
S
S
N
N
S
S
N
N
S
●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.
S
N
S
N S
N S
N
●Please request for a specification sheet for detailed product data prior to the purchase.
N
N S
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
●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.
●Please request for a specification sheet for detailed product data prior to the purchase.
●All specifications productcatalog catalog, please read "Precautions" are subjectsafety precautions listed in Priorprinted version catalog. contact NEC TOKIN for updated product data.
●Before using the in this in this and production status of products and other to change without notice. the to the purchase, please
External magnetic field
Sensors – TRS™ Series Thermal Reed Switch
TRS/OHD installation direction in external magnetic field
External magnetic field
Magnetic field from equipment
External Magnetic Field
Magnetic field emitting equipment
such as motors, coils
TRS/OHD installation
in external
external magnetic field
TRS installation
direction in
magnetic field
Magnetic field from equipment
Wrong direction Correct direction
N
N
S
Magnetic field emitting equipment
such as motors, coils
Wrong direction Correct direction
N
N
S
N
N
S
S
S
S
Magnet inside TRS is
parallel to the external field
→ Greater Influence
N
S
Magnet inside TRS is
perpendicular to the external field
→ Less influence
N
S
Magnet inside TRS is
parallel to the external field
→ Greater Influence
Magnet inside TRS is
perpendicular to the external field
→ Less influence
Ferromagnetic material influence
3
Ferromagnetic material influence
Operation temperature variation
(°C)
2
Ferromagnetic material influence
1
0
－1
－2
－3
－4
－5
Operation temperature variation
(°C)
3
2
1
0
－1
－2
0
－3
－4
－5
0
2
4
2
4
6
8
10
12
Gap distance_d
（mm）
14
16
BType
MType
TRS
BType
MType
d
Soft iron (thickness 3.3mm)
Note; Above figures are for reference only and are not guarantee
d values.
d
TRS
TM
Before Using Thermal Reed Switch (TRS
figures are for
)
reference only and are not guarantee
d values.
Environmental Compliance
Note; Above
• Please ask for a copy of specification and check the contents thoroughly before the actual use.
• Please
TRS sensors are
deciding your specifications.
All
contact us before
RoHS compliant.
• Do not use in close proximity to strongly magnetized parts.
TM
Before
if dropped or
Reed Switch (TRS
)
• Do not use
Using Thermal
strongly shocked.
• Please with greater of specifi specified.
• Do NOT useask for a copyload thancation and check the contents thoroughly before the actual use.
W h•ePlease lcontact se swi tchedeciding iyour one to cations.ng surge vol tage ( i nducti ve l oad) or rush current
n i nsta l i ng theus before s i n ci rcu ts pr specifiproduci
•
RoHS Compliant
proximity to strongly magnetized parts.
Do not use in close
(in lamps and motors), an appropriate switch type should be used, or a contact point protection circuit added.
• d s ress ( es if dropped i o strongly of addi ti
• A voiDotnot usepeci al l y torsorn) i n case shocked.onal processi ng.
• reed switch has specifi load than specified.
• EachDo NOT use withagreaterc resonance frequency. Please contact us when an oscillation is added.
W hen i nstal l i ng these swi tches i n ci rcui ts prone to produci ng surge vol tage ( i nducti ve l oad) or rush current
(in lamps and motors), an appropriate switch type should be used, or a contact point protection circuit added.
• A voi d stress ( especi al l y torsi on) i n case of addi ti onal processi ng.
NEC TOKIN Sensors Vol.14
7
• Each reed switch has a specific resonance frequency. Please contact us when an oscillation is added.
6
8
10
12
Gap distance_d
（mm）
14
16
Soft iron (thickness 3.3mm)
cifications in this catalog and production status of pr
o
request for a specification sheet for detailed product
d
using the product in this catalog, please read "Precau
t
ducts are subject to change without notice. Prior to the purch
a
ata prior to the purchase
.
ions" and other safety precautions listed in the printed versi
o
NEC TOKIN Sensors Vol.14
7
se, please contact NEC TOKIN for updated product .data
n catalog
.
All specifications in this catalog and production status of pr
o
Please request for a specification sheet for detailed product
d
Before using the product in this catalog, please read "Precau
