Page 1
W A T L O W
99
RTDs and Thermistors
RTDs and
Thermistors
Resistance
Temperature Sensing
RTDs
Watlow’s platinum resistance
elements are specially designed to
ensure precise and repeatable
temperature versus resistance
characteristics. The sensors are
made with controlled purity platinum,
have high purity ceramic components
and constructed in a unique strainfree manner.
Performance Capabilities
• Ceramic elements are extremely
precise and stable within the wide
temperature range of -200 to 650°C
(-328 to1200°F).
Features and Benefits
Patented, strain-free construction
• Provides dependable, accurate
readings
• Allows elements from different lots
to be substituted without
recalibration
High signal-to-noise output
• Increases accuracy of data
transmission
• Permits greater distances between
sensor and measuring equipment
Temperature coefficient (alpha)
carefully controlled while
insulation resistance values
exceed DIN-IEC-751 standards
• Ensures sensor sensitivity
• Minimizes self heating
• Allows precise measurement
• Repeatable
Highly controlled manufacturing
process
• Ensures wide temperature range
• Stabilizes physical and chemical
attributes
Metric diameters and fittings are
available, please consult factory
Applications
• Air conditioning and refrigeration
servicing
• Furnace servicing
• Stoves and grills
• Textile production
• Plastics processing
• Petrochemical processing
• Micro electronics
• Air, gas and liquid temperature
measurement
• Exhaust gas temperature
measurement
Page 2
RTDs and
Thermistors
Speciality RTDs
and Thermistors
Construction Styles
10 = 6 in. Adjustable Spring Style
11 = 12 in. Adjustable Spring Style
12 = Adjustable Armor Style
50 = Open Air
80 = Surface Mount55 = Open Air with Flange
25 = Cartridge with Flange
0.265 in.
(6.7 mm)
O.D.
L
E
0.
3125 in.
(7.9 mm)
0.625 in.
(15.9 mm)
Stainless
Steel Sheath
and Flange
Flange
0.648 in.
(16.5 mm)
0.324 in.
(8.2 mm)
0.187 in.
(4.7 mm)
0.373 in.
(9.5 mm)
0.156 in.
(4 mm) Dia.
(3) Holes
L
E
0.625 in.
(15.9 mm)
Stainless
Steel Sheath
and Flange
0.187 in.
(4.7 mm)
L
E
Flange
0.648 in.
(16.5 mm)
0.324 in.
(8.2 mm)
0.373 in.
(9.5 mm)
0.156 in.
(4 mm) Dia.
(3) Holes
4.7 mm
(0.187 in.)
0.875 in.
(22.2 mm)
0.101 in.
(2.6 mm) Dia.
(4) Holes
1.375 in.
(34.9 mm)
0.250 in.
(6.3 mm)
0.343 in.
(8.7 mm)
E
Aluminum
Body
0.531 in.
(13.5 mm)
0.250 in.
(6.3 mm)
See next page for
Rapid Ship sensors and
ordering instructions.
W A T L O W
107
RTDs and Thermistors
0.3125 in.
(7.9 mm)
L
(Spring O.D. = 0.250 in. (6.4 mm)
E
Spring
Length
L
0.187 in.
(4.7 mm)
E
Page 3
108
Construction 10
with Fiberglass and S10DDN4C048A S10DDN4C072A
SS overbraid leads
Construction 80
with Teflon®leads S80ADT2A048A S80ADT2A072A
RTDs and
Thermistors
Speciality RTDs
and Thermistors
Specifications: RTD
• Two- or three-wire
• Resistance: 100Ω at 0°C
• Alpha curve: 0.00385Ω/Ω/°C
• Tolerance at 0°C: ±0.12% (±0.25°C)
• Range: -50 to 260°C (-58 to 500°F)
Specifications: Thermistor
• Metal oxide, sintered and
encapsulated
• Negative temperature coefficient
• Non-linear temperature/resistance
curve
• Resistance at 25°C (77°F) and
ranges:
2-3. Construction
10 = 6 inch adjustable spring style
11 = 12 inch adjustable spring style
12 = Adjustable armor style
25 = Cartridge with flange
50 = Open air
55 = Open air with flange
80 = Surface mount
4. Diameter (inch)
D = 0.188
A = Not applicable: surface mount
5. Element Type
C = RTD 2-wire No. 3850 N = Thermistor No. 12
D = RTD 3-wire No. 3850 P = Thermistor No. 16
M = Thermistor No. 11
6-7. Lead Type
L4 = Fiberglass and SS armor
M4= Fiberglass
N4 = Fiberglass and SS overbraid
T2 = PFA or TFE
8. Sheath Length “L” (inches)
A = Not applicable
C = 1.5 (required for VAT construction: No. 10, 11, 12)
D = 2.0 L = 5.5 T =9.0
E = 2.5 M = 6.0 U =9.5
F = 3.0 N = 6.5 W =10.0
G = 3.5 P = 7.0 Y =11.0
H = 4.0 Q = 7.5 Z =12.0
J = 4.5 R = 8.0
K = 5.0 S = 8.5
9-11. Lead Wire Length “E” (foot)
012 = 1 084 = 7
024 = 2 096 = 8
036 = 3 108 = 9
048 = 4 120 = 10
060 = 5 180 = 15
072 = 6
12. Terminations
A = 1.5 inch stripped split leads, no terminals
B = No. 8 spade terminals
H = 0.25 inch female quick connect terminals
S
123456789101112
*Other thermistors available on request.
Consult factory. See Style TB thermistor
on page 109.
#11 1000Ω -60 to 150°C (-76 to 302°F)
#12 3000Ω -60 to 150°C (-76 to 302°F)
Epoxy Bead Tolerance
±1%Ω +0.3°C (37°F)
#16 100,000Ω -60 to 260°C (-76 to 500°F)
Glass Bead Tolerance
±15%Ω +0.3°C (37°F)
*
Custom Ordering Information—Items in Bolded Green Type are preferred
with shorter lead times.
Part Number
4 Foot (102 mm) Leads 6 Foot (152 mm) Leads
Rapid Ship sensors come with 100Ω DIN 0.00385 curve RTD sensor, 24 AWG stranded threewire leads, temperature rating -50 to 260°C (-58 to 500°F), standard split end lead termination
and no mounting fittings.
Rapid Ship Sensors
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