Watlow RT Style Specifications
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
W A T L O W
105
RTDs and
Thermistors
RTD Style RT
For Use with Thermowells
a
Units with transmitter, buyer to specify
range and degree C or F, as well as
temperature span.
b
Other sizes, lengths and materials available.
Consult factory.
Features and Benefits
High quality thermowells and pipe
wells
• Protect sensor
Mineral insulated construction
• Available in 0.125 to 0.250 inch
O.D.
Available with spring-loading
• Ensures positive contact
Complete assembly available
• Head mounted 4-20mA
transmitter, two- or three-wire
input and non-isolated
Variety of connection head options
• Meet your application
requirements
6 inch N-U-N Typical (2 each 1⁄2 X 3 inch steel
pipe nipples and 1 each malleable union)
4 inch N-U typical (1 each
1
⁄2 X 3 inch steel pipe
nipple and 1 each malleable union)
3
/4
in. (19 mm) NPT
Nom. 4 in. (152.4 mm)
L
1
⁄2 X 3 inch long steel pipe nipple typical
3
/4
in. (19 mm)
NPT
Nom. 2 in. (50.8 mm)
L
3
/4
in. (19 mm)
NPT
L
3. Sheath O.D. (inch)
G = 0.125 J = 0.250
H = 0.188
4. Connection Head
C = Polypropylene
D = Cast iron
E = Cast aluminum
H = Explosion proof
Ua= E head with 5750 transmitter
Va= C head with 5750 transmitter
Wa= H head with 5750 transmitter
5. Cold End Configuration
b
Type 1 Type 2 Type 3 Type 4
6. Enter “0”
7. Sheath Construction
-50 to 260°C -200 to 650°C
(-58 to 500°F) (-328 to 1200°F)
316 SS 316 SS
Standard Industrial A —
Mineral Insulated — K
8-9. Sheath Length “L” (see drawings at left)
When ordering a complete assembly with thermowell, specify “AR”
as required. Otherwise, specify the “L” dimension in whole inches.
10. Sheath Length “L” (fractional inch)
0 = No fraction, whole inches
1=
1
⁄8 3=3⁄8 5=5⁄8 7=7⁄8
2=1⁄4 4=1⁄2 6=3⁄4
11. Element
2-wire 3-wire 4-wire
100Ω Single A B C
12. Temperature Coefficient
DIN 0.00385
A = Class A
B = Class B
14. Spring-Loading
Y = Yes N= No
15. Special Requirements
0 = None
X = Special requirements, consult factory
RT 0 0
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For further details on
Watlow connection heads
see the hardware section
of this catalog, pages
156 to 157.
For a complete RTD assembly, add thermowell part
number. See thermowell
section, pages 144 to 146.
3
/4
in. (19 mm) NPT
Nom. 6 in.
(152.4 mm)
L
Custom Ordering Information—Items in Bolded Green Type are preferred
with shorter lead times.
Type 1
Type 2
Type 3
Type 4
RTDs and Thermistors
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