Watlow RT Style User Manual

RESISTANCE TEMPERATURE SENSING (RTDs)

Watlow RTDs
Ensure Precise
and Repeatable
Temperature
Measurement

Watlow provides a complete line of RTDs for a wide variety
of process and industrial applications. These sensors
have been designed to ensure precise and repeatable
measurements as well as meet the environmental
requirements for the application. RTD sensors may be
configured to meet your specific application need with
options including, but not limited to the following: element
type, lead wire configuration, termination style, sheath
materials, lengths and diameters, process connection heads,
transmitters, thermowells, spring loading, flanges and surface
mount packages.

Watlow takes pride in working with customers to solve difficult
application problems and will work with you to tailor a solution
to meet your specific application requirements.

Applications

• Air conditioning and refrigeration servicing

• Furnace servicing

• Food equipment

• Processing

• Stoves and grills

• Textile production

• Plastics processing

• Petrochemical processing

• Micro electronics

• Air, gas and liquid temperature measurement

Features and Benefits

Strain-free construction

• Provides highly-repeatable, long-ter

• Allows elements from different lots to be substituted without

recalibration

High signal-to-noise output

• Increases accur

• Permits greater distances between sensor and measuring

equipment

Linear change in resistance per degree change in
temperature

• Mak

es it easy to interpret the signal

• Allows for less complex instrumentation

• No cold junction compensation required like a thermocouple

High accuracy

• Pro

vides RTDs with either Class A +/- 0.15°C or Class B

+/- 0.3°C nominal at 0°C

• Provides three and four wire constructions available to

minimize impact

Wide temperature operating range

• Oper

ates at temperature ranging from -200 to 650°C

(-328 to 1202°F)

acy of data transmission

m, accurate readings

Your Authorized Watlow Distributor is:

© 2007 Watlow Electric Manufacturing Company

RIC-RTD-0907

Standard Industrial Insulated Leads –

Lead Wire

Length

L

1

/

2

in. (13 mm)

Nominal

L

L

E

6 ft. (1829 mm)
Teflon

®

Leads

1

/

2

in. (13 mm)

Nominal

L

Single
Threaded
Fitting

L

Double
Threaded
Fitting

3

/

4

in. (19 mm) NPT

Nom. 6 in.

(152.4 mm)

L

3

/

4

"

NPT

Nom. 4"

L

3

/

4

in. (19 mm) NPT

Nom. 4 in. (152.4 mm)

L

3

/

4

in. (19 mm)

NPT

Nom. 2 in. (50.8 mm)

L

3

/

4

in. (19 mm)

NPT

L

Style RB

Style RB RTDs have standard, insulated
leads with an internal heat transfer plate
for a quick time response and high
accuracy. These RTDs are also epoxy
sealed to resist moisture and pull out.
There is a standard 260°C (500°F)
potting. Style RB RTDs are constructed
of 316 stainless steel for a durable, rigid
sheath with temperatures from -50 to
260°C (-58 to 500°F). These RTDs are
manufactured in diameters from 0.125
to 0.250 inches.

Emergency Use Cut-to-Length – Style RK

Style RK RTDs are manufactured with a
cut-to-length feature that combats the
need to stock several RTD lengths. The
probes can be shortened to a three inch
minimum using a tubing cutter. These
sensors have dependable readings,
three-wire, Class A DIN 0.00385 curve.
Style RK RTDs are internally sealed to
prevent moisture penetration and are
constructed with a durable, rigid 316
stainless steel sheath with temperatures
from -50 to 260°C (-58 to 500°F). These
RTDs can be sold in an emergency kit
of five adjustable RTD sensors.

Plug or Jack Termination – Style RC

Style RC RTDs are manufactured with durable
connectors with copper pins for plug or jack
termination applications. These provide simple
connection to extension leads and have a 200°C
(400°F) temperature rating. In addition, the RTD
has a crimp, compression adapter that assures
superior connector attachment with high accuracy
and dependable readings. Style RC RTDs are
constructed of 316 stainless steel for a durable,
rigid sheath with temperatures from -50 to 260°C
(-58 to 500°F).

Metal Transitions – Style RF

Style RF RTDs is constructed of flexible, mineral
insulation that provides a bendable and highly
durable sensor. It is manufactured with stainless
steel transitions that are crimped to the sheath and
filled with 260°C (500°F) epoxy (brazing is optional).
These sensors have a coiled spring for strain relief,
which protects lead wire against sharp bends in
the transition area. The RF RTD has a -200 to
650°C (-328 to 1200°F) temperature rating with
dependable readings and high accuracy. These
sensors come in diameters ranging from 0.125 to

0.250 inches.

Connection Head – Style RR

Style RR connection heads
provide superior dust and moisture
resistance and come in single
and double threaded fittings.
These weatherproof plastic heads
resist weak acids, organic solvents,
alkalies, sunlight and dust. Complete
assembly is available.

Thermowells – Style RT

Style RT thermowells and pipe wells protect the sensor and
are made of high quality construction. They are constructed
with mineral insulation and are available in diameters ranging
from 0.125 to 0.250 inches. Style RT is available with
spring-loading ensuring positive contact every time. There
are a variety of connection head options to meet your specific
application requirements. Complete assembly is available.

Type 1

Type 2

Type 3

Ordering Information

Ordering information varies. Please contact Watlow
for details.

Type 4

To be automatically connected to the nearest North American Technical and Sales Office:

1-800-WATLOW2 • www.watlow.com • [e-mail]

International Technical and Sales Offices: Australia, [phone] • China, [phone] • France, [phone] •

Germany, [phone] • Italy, [phone] • Japan, [phone] • Korea, [phone] • Malaysia, [phone] •
Mexico, [phone] • Shanghai, [phone] • Singapore, [phone] • Spain, [phone] • Sweden, [phone] •
Taiwan, [phone] • United Kingdom, [phone]