M2 Series
Narrow Differential Welded,Hermetic Seal
. Snap-action
switching
. Single
pole,
single
throw
. Preset,
non-adjustable
calibration
. Welded,
withnitrogen
hermetic
sealandbackfilled
. Normally
closed
openornormally
. Qualified
/ 20(orderbyMSnumber)
to MIL-$24236
. GAM.T1
Actual
size
TypicalCrossSectionView
M2 thermostats are recommended
temperature sensor and actuates
for use as controls and warning
devices in guided missiles, aircralt
a switch capable of handling high
power. Welded closed after
controls, heating blankets,
accurate calibration, the M2 is
electronic circuit components,
tamperproof.
servomechanisms, gyroscopes,
aerial cameras, crystal ovens,
surface heaters, computers and
similar electronic devices where
reliable performance is vital.
The M2 is available with a variety
of terminals and can be mounted
in any position: through openings
in metal closures, in casting
wells, in ducts for control of air
Precision temperature accuracy
temperature. A surface mounting
and long life reliability are
bracket or stud can be provided.
achieved through the use ofthe
well known Klixon snap-acting
disc. This unique mechanism
multiplies the motion of the
TI's years of engineering experience have yielded a wide variety
Base
of easy to use mounting means.
SpecialM2 Thermostats
Many configurations are available beyond the standard units shown above. Several varieties are shown below.
The device can easily be custom designed into packages such as probe thermostats or strap mounted units.
M2S.39STYLE
Stud
#6-32x .187Threaded
M2S.35STYLE
#6-32x.375
Threaded
Stud
with PottedTerminals
and12"Leads
Surface
Sensing
(
\.
21532
STYLE
AirFlowSensor
M2S.31STYLE
IntegralMountingBrackets
with
.115Dia.Holeson 13/16"Centers
PartNumberingSystemfor SpecialM2 Thermostats
To facilitate the ordering of M2 thermostats to your specifrcations use the part number code below. The code
permits you to call out a complete production parb number at the time of component selection.
M2S L 163 03 05
_I-T T
T{PE
M2S
Basic
number
OPERAIION
L=Openontemp.rise
rise
ontemp.
F=Close
,*ra*t*E' --l
temperatureoF
Closing
q/
39
TOLERANCE
temperature
Closing
(fF)
tolerance
DIFFERENTIAL
05=2'5F
SWLESELECT
e.g.:-39
PerformanceCharacteristics
Action
Switch
SPSI normally openor normally
closed
ContactRatings(Besistive)
Voltage 30vDc120VACCycles
2.0 250,000
Amperes 2.0
Basedonstandarddifferential
ShockResistance
100G,6 milliseconds,
Method213
per MIL-STD-2O2,
(monitored)10 microseconds
chatter, max.
Hermeticity
1 X 104atm cclsec.max,
per MIL-STD-202,
Method112,
ConditionC
SaltSpray
per MIL-STD-202,
Method101,
ConditionB, 57osolution
ContactResistance
0.050ohmsmaximum,
per MIL-STD-202,Method307
DielectricStrength
1250VAC,rms,
60 cyclesfor 1 minute,
per MIL-STD-202,Method301
Opening Closing
Temperature
Temperalure
Ditlerential Tol.fF)
('F)
std. spec
u
2-5
0 to250
aJ
(-17to121"C) (1.1to2.8'C) '\9.2tr 11.7{
r4
3-7
251to300
i4
(122to 149"C) (1.7to3.9"C)(12,8"C
!2.2'C
The M2 thermostat is ordered by
specifying the closing temperature with tolerance and the
opening temperature in terms of
Weight(Average)
5.4 grams
a differential range, either above
or below the actual closing
Range
AmbientTemperature
-65"Fto 400"F(dependingon calibratedtemperature).Exposureis
limited to 100'F aboveoperating
temperaturefor closeon rise
devicesor 100"Fbelowoperating
temperaturefor op,enon rise
devices.
VibrationResistance
10-2000Hz, 10G,
per MIL-STD-202,Method204,
ConditionD, (monitored)
chatter,max.
10 microseconds
50G (unmonitored)
20-2000Hz (opencontacts)
Settings
Temperature
temperature.
Example: Closeat 100"F+4,open2-5"F
above.In anyonelot, the thermostats
Each
will closebetween96 and 104"F.
thermostatwill open2-5"Fabovethe
actualclosingtemperatureofthat
thermostat.
Part NumberingSystemfor StandardM2Thermostat
To facilitate the ordering of M2 thermostats to your specifications use the part number code below. The code
permits you to call out a complete production part number at the time of component selection.
-]TT I
M 21 1 L
TYPE
Basic
number
BRACKET
1=Nobrachet
2 =Loose
brackel
TERMINAL.
1=Straight
2=450
3=Right
angle
1 6 3 0 3 0 5 2 1
***l
TOLEBANCE
Closing
rise
L=Open
ontemp.
temperature
F=Close
rise
ontemp.
(fR
lolerance
TEIiIPERATURE
3=i3
(oF)
Closing
temperature
4=+4
= 163'F,090
=90'F)
(e.9.163
5=15
DIFFERENTIAL
(M=2to4oF
05=2to5oF
07=3to7"F
CONTACTS
1=Silver
contacts
2 =Goldplated
contacts
PLATING
2 =Copper-nickel
4 =Tinplate
6 =Copper
7 =Gold
8 =Zinc/olive
drab
chromate
48 AngleTerminals
StraightTerminals
.G3 DIA HOLE ---\
I I
, r,u
f . . ^
T- ------f--->->!
( Hl l
,oo'"o,1
l
l
l
r
-l
. / l
f-
375MAx
II
.T
660 MAX
250
I
Mounting
Bracket
ft3 DtA HOLE -\
T-
350 MAX
J
l. 45.
! ,
|
t
r
RightAngleTerminals
f
r---T_--=11
^
-l
T
( lHi.*o"ot
3 q q * o ,|
]
l - r -J l .-------T-------
positon.
intheclosed
of 1OOF
inexcess
overrides
l0lemperature
notbesubiected
should
ThermoStats
in
tncnes.
snown
Dimensions
T- -t-_V/T
I
I
+ I-
a---u(
\
-
E
l
.o75MAx