Watlow K-RING Data sheet
W A T L O W
Cable Heaters
• Same day shipment on all stock units.
K-RING
®
Watlow’s K-RING®heater takes
nozzle heater technology a step
ahead of the competition. Thanks
to its innovative design, plastic
molders no longer have to
compromise with sloppy fit
tolerances, uneven temperature
profiles or short heater life.
Featuring a machined brass casting
construction, the K-RING heater can
handle very high temperatures while
providingmaximum heat transfer.
With a precision machined inside
diameter, the K-RING heater fits
perfectly—and it doesn’t even
require clamping bands. Precision
fit, along with the excellent thermal
conductivity of brass, allow the
K-RING to give you an extremely
even temperature profile.
Performance Capabilities
• Operating temperature to 1200°F
(650°C)
• Maximum watt density on inside
diameter to 260 W/in2(40 W/cm2).
• Maximum voltage to 240VÅ(ac)
Features and Benefits
• Brass casting construction
protects the heater from damage,
as well as maximizes transfer of
heat to heated parts.
• Precision machining of length
and inside diameter gives
precision fit tolerances.
• Sealed construction of the
heater body eliminates
contamination. The adaptor also
effectively seals the lead exit.
• Stainless steel outer casing
protects the brass heater body,
and as an option, can be polished
to increase heater efficiency.
• Distributed wattage allows heat
to be precisely placed for an even
temperature profile.
• Customized diameters, with
quick delivery, are available to
meet specific application needs.
Applications
• Sprue bushings in plastic molding
equipment
• Plastic injection nozzles
• Process heating of liquids and
gasses in processing lines
• Hot melt equipment
• Laboratory and analytical
equipment
Electrical Tolerances
Resistance: ±10 percent
Wattage: ±10 percent
Stainless
Steel
Casing
Precision
Machined
Inside
Diameter
36" (1 m) Fiberglass
Insulated Leads
Distributed Wattage
1
" (6.5 mm)
⁄4
Diameter Adapter
Brass Construction
Cable Heaters
71
Thermocouple
Located in
Center Coil
Cable Heaters
50 ± 5 mm
(2 ± 1/4")
Dia.
7.3 mm
(0.29")
K-RING
Termination Options
Sensors
Thermocouple Types
Temperature
ASTM Conductor Characteristics Range
Code Positive Negative °C (°F)
J Iron Constantan -20 to (0 to
(Magnetic) (Non-Magnetic) 760 1400)
K Chromel
(Non-Magnetic) (Magnetic) 1260 2300)
®
Alumel
®
-20 to (0 to
Protection Against Abrasion
Crimped-on fiberglass braid or
stainless steel braid offers lead wire
protection against abrasion or sharp
equipment. To order, specify
fiberglass braid or stainless steel
braid and lead length.
Heavy Duty Strain Relief
A heavy duty stainless steel tube is
added to the cable transition of the
K-RING, providing strain relief to the
lead exit. This is supplied as a
standard feature.
Internal Thermocouple
Internally grounded Type J or Type
K thermocouples, offer accurate
sensing of internal heater temperatures. Thermocouple wires attach
directly to a Watlow controller, which
must be purchased separately.
Thermocouples are supplied with
1 m (36 inches) fiberglass insulated
leads. Upon request, longer lead
lengths are available.
2 ±1⁄4"
(50 ± 55 mm)
Dia.
0.29"
(7.3 mm)
To order, specify internal thermocouple, Type J or K, and lead
length.
Thermocouple
Located in
Center Coil
K-RING Stock Nozzle Heater
I.D. Nominal O.D. Length Watts Volts Code Number
inches (mm) inches (mm) inches (mm)
1
⁄2 13 1 25 1 25 175 240 BKR1302501A
1
⁄2 13 1 25 2 51 300 240 BKR1305101A
5
⁄8 16 11⁄8 28 2 51 300 240 BKR1605102A
5
⁄8 16 11⁄8 28 3 76 500 240 BKR1607602A
5
⁄8
3
⁄4 20 11⁄4 32 1 25 250 240 BKR1902501A
3
⁄4
7
⁄8 22 13⁄8 34 2 51 500 240 BKR2205102A
7
⁄8 22 13⁄8 34 3 76 750 240 BKR2207601A
7
⁄8
Inner diameter tolerance to ±0.001 in (0.025 mm).
Length tolerance ±0.02 in (0 to 100 mm ±0.5 mm); over ±0.04 in (100 mm ±1.0 mm).
Note: Custom metric manufactured K-RING heaters, F.O.B. Germany.
16 1
20 1
22 1
How to Order
To order stock K-RING heater,
specify:
• Required inside diameter
• Maximum allowable outside
diameter
1
⁄8
1
⁄4
3
⁄8
28 4 102 750 240 BKR1610202A
32 2 51 350 240 BKR1905101A
34 4 102 1000 240 BKR2210201A
• Maximum allowable length of the
K-RING
• Volts/watts
• Lead length, protection and
thermocouple type if other than
standard
72
F.O.B.: Batavia, Illinois
• Any of the options required
Availability
Stock: Same day shipment
Made-to-Order: Consult Watlow
Alumel®and Chromel®are registered
trademarks of Hosking Manufacturing Co.
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