HEATERS FOR EVERY APPLICATION
PHONE: (978) 777-0070
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HEATERS FOR EVERY APPLICATION
PHONE:
(978) 777-0070
Cartridge Heaters: Special Features
Electric Heater Special Features and Modifications
The following is an outline of Special Features and Modifications available with
Hotwatt Electric Heating Elements.
It applies to all Standard, Superwatt, Square and Rectangular Cartridge Heaters and
Immersion Heaters. Catalog
Numbers have been assigned to all special features and modifications. Please provide an
adequate description to
avoid confusion when a special feature applies to more than one size or item. Special
features for other heaters are
covered in each specific section.
Lead Configurations
SF1: Flexible Leads for applications where leads can be bent close
to end of unit.
See specific unit size for maximum allowable amperage.
Standard on:
Available on:
SF2: Leads for application where repairable leads are desired or when unit amperage will not allow the use of Type SF-1 leads.
Standard on:
Available on:
SF3: Post terminals.
Standard on:
Available on:
SF4: Leads for application where lead space is minimum and it is
desirable to bring
leads out at right angles to sheath. Specify overall length of heater when ordering.
Unheated 3/8"
Nominal
Available on:
SF5: Lead spring protector. Leads reinforced with steel spring
for applications where
excessive flexing is encountered. Standard spring length is 1" on 1/4" to
1/2" diameters
and 1 1/2" on 5/8" to 3/4" diameters. Longer spring lengths are available.
Consult factory.
| Catalog Number |
Unit Diameter |
A | B |
| SF5A | 1/4" | 1/4" | 1" |
| SF5B | 3/8" | 1/4" | 1" |
| SF5C | 1/2" | 1/4" | 1" |
| SF5D | 5/8" | 1/2" | 1 1/2" |
| SF5E | 3/4" | 1/2" | 1 1/2" |
Available on:
SF6: Ground wire.
Available on:
SF7: Fiberglass sleeving. Additional sleeving over leads for
protection.
Leads are normally 2" longer than sleeve.
SF7A: Common sleeve. Single sleeve over both leads.
SF7B: Individual sleeve. Single sleeve over each lead. Specify length of sleeve.
Available on:
SF8: Silicone rubber sleeving. Additional sleeving over leads
for protection and
moisture resistance.
SF8A: Common sleeve. Single sleeve over both leads.
SF8B: Individual sleeve. Single sleeve over each lead. Specify
length of sleeve.
Leads are normally 2" longer than sleeve.
Available on:
SF9: Strain relief clip for leads subject to strain and pull.
Available on:
SF10: Ceramic bead insulation for leads subject to high
temperatures up to 1000° F.
Specify lengths of beads required when ordering.
Available on:
Lead End Termination
SF11: Lugs, rings, quick connect terminals attached to the end
of lead wires.
Specify terminal type and size when ordering. Special terminals are available.
Available on:
SF11A: Ring terminals. Specify size: #6, #8, #10.
SF11B: Straight quick connect terminals. Specify male or female and size: 3/16" or 1/4".
SF11C: Flag quick connect terminals. Specify male or female and size:
3/16" or 1/4".
SF11D: Spade terminals. Specify size: #6, #8, #10.
SF12: Male dead front armored plug. May be mounted directly to heater.
Available on:
Ground wire (SF6) should be specified when using any 3 prong plug.
SF12-P1: 2
prong/straight blade/2 pole/2 Wire/UL&CSA Listed/
NEMA 1-15P/125 volts/15 amps.
SF12-P2: 2 prong/twist lock/2 pole/2 wire/UL
Listed/NEMA L1-15P/
125 volts/15 amps.
SF12-P3: 3 prong/twist lock/2 pole/3
wire/UL&CSA Listed/
NEMA L6-15P/250 volts/15 amps.
SF12-P4: 3 prong/twist lock/2 pole/3
wire/UL&CSA Listed/
NEMA L6-20/250 volts/20 amps.
SF12-P5: 3 prong/straight blade/2 pole/3
wire/UL&CSA Listed/
NEMA 5-15P/125 volts/15 amps.
SF13: Enclosures for protection of electrical connections.
SF13A: General purpose box, NEMA No. 1. 2 3/4" x 1 1/2" x 1 1/2".
Available on:
SF13B: Moisture resistant box. Mounted on NPT fitting.
Available on:
SF13C: Explosion resistant box. Mounted on NPT fitting.
Available on:
SF13D: General purpose box. NEMA No. 1.
Rust
resistant steel. 4" octagonal.
Available on:
Lead Protection
SF14: Flexible, Stainless steel conduit for straight leads.
|
- Specify
Overall - |
Length
Specify
Length 5/8"
| 6"
| of
Conduit |
Max | | Dia.
+ .030" |
|
| 3/4" Nom. |
Unheated
Available on:
SF15: Flexible, stainless steel conduit for right angle leads.
Specify Length
| 6"
|
of Conduit
|
_______________
5/8" Max
----- 3/4" Nom.
Unheated
Specify
Overall
Length
___________
| Unit Size | Conduit O.D. | Min.Bend Dia. |
| 3/16" - 1/4" | .244 nominal | 1.31" inside |
| 3/8" | .350 nominal | 1.93" inside |
| 1/2" - 5/8" | .381 nominal | 2.12" inside |
| 3/4" & up | .500 nominal | 2.25" inside |
Available on:
SF16: Stainless steel, flexible braid for straight leads.
Specify braid length.
Lengths are supplied 6" longer than braid.
Available on:
SF17: Convoluted bronze tubing. Flexible sealed tubing for
waterproof leads.
Available on:
SF18: Right angle convoluted bronze tubing.
| |5/8"Max| | 3/4" Nom.| Unheated | Specify Overall Length | |
 |
Available on:
SF19: Straight solid copper extension. Specify length when ordering. Leads are 6" longer than tubing.
Available on:
Sealing and Potting Lead End for Adverse Environmental Conditions
SF20: Silicon rubber potting for moisture proof application to
400° F (204șC) in potting area.
Silicon rubber sleeving must be used in conjunction with potting. See Special Feature
SF-8.
Available on:
SF21: Epoxy potting for moisture proof applications to 265° F (129șC) in potting area.
Available on:
SF22: Teflon end seal for moisture applications to 400° F.
Available on:
SF23: Ceramic to metal seals for hermetic sealing and vacuum
applications to 1000° F.
 |
| | Specify Sheath
| See | Length Table |
Available on:
| SF23: Table Of Dimensions | ||||
| Catalog No. | Unit Diameter | |||
| A | B | C | D | |
| SF23-A | 3/8" | .148" | 1/2" | 1" |
| SF23-B | 1/2" | .180" | 17/32" | 1 5/32" |
| SF23-C | 5/8" | .238" | 9/16" | 1 3/16" |
| SF23-D | 3/4" | .304" | 19/32" | 1 7/32" |
Attaching Fittings
SF25: Units with pipe bushing.
| Heater O.D. |
Pipe Thread NPT Size | A | B | C | D | AF |
| 1/4" | 1/8" | 1/8" | 1/2" | 3/16" | 15/16" | 7/16" |
| 3/8" | 1/4" | 1/8" | 9/16" | 3/16" | 1 1/16" | 5/8" |
| 1/2" | 3/8" | 3/16" | 5/8" | 1/4" | 1 1/8" | 11/16" |
| 5/8" | 1/2" | 3/16" | 3/4" | 1/4" | 1 3/8" | 7/8" |
| 3/4" | 3/4" | 1/4" | 7/8" | 3/8" | 1 5/8" | 1 1/8" |
| 15/16 & 1" | 1" | 1/4" | 15/16" | 1/2" | 1 7/8" | 1 1/2" |
| 1 1/4" | 1 1/4" | 5/16" | 1 1/32" | 1/2" | 1 15/16" | 1 3/4" |
| 1.9" | 2" | 9/16" | 1 7/16" | NA | NA | 2 1/2" |
| 2 3/8" | 2 1/2" | 5/8" | 1 3/4" | NA | NA | 3" |
Brass Bushings
SF25A: Single Brass.
SF25B: Coupling Brass.
Stainless Steel Bushings
SF25C: Single Stainless Steel.
SF25D: Coupling Stainless Steel.
Available on:
SF26: Units with flanges. Mounting hole centers for 1/4" to
5/8" diameter is 1 1/8"
and for 3/4" diameter is 1 5/32". Special flange sizes available upon request.
Available on:
SF27: Stainless steel riser and support feet for over the side immersion heaters.
Special Electrical Features
SF28: Three phase heaters.
Available on:
SF29: Multiple heat; when a single unit with multiple
wattages is necessary.
Some uses of these units include: quick heat-up with a standby circuit for
maintenance of low temperature; providing different wattages when there is
a wide variation in thermal loads; and replacing more expensive rheostats or
powerstats for wattage control.
Available on:
SF30: Special wattage distribution for units requiring different
concentrations of
wattage over their heated length. Distribution should be specified as a percentage
of wattage over a percentage of length, i.e. 36/25.
Available on:
SF31: Built in thermocouple. Junction at bottom of heater.
Ungrounded thermocouple:
Grounded thermocouple:
Available on:
SF32: High voltage heaters from 300V to 600V. Consult factory for availability on items.
| Maximum Voltage/Unit Size | ||||||
| Diameter | 5/8" | 3/4" | 1" | 1 1/4" | 1.90" | 2 3/8" |
| Std.Cart. | 480V | 480V | 480V | 600V | 600V | 600V |
| Superwatt | 480V | 480V | 480V | NA | NA | NA |
| Immersion | 480V | 480V | 480V | 600V | 600V | 600V |
Other Physical Features
SF33: Double end units. One terminal at end. Especially suitable
for heating: warming closets, ovens,
press heads, drying cabinets, platens and plates. Double end units (post type terminals at
each end)
can be installed in reamed holes or in machined grooves. The standard sheath material is
stainless steel
and cannot be bent or formed. Available with SF1 or SF3 terminations.
Available on:
SF34: Odd sizes: 7/16", 9/16", 11/16", 13/16", and 7/8" diameter. Stainless steel sheath.
Available on:
SF36: Centerless ground on diameter for precision fit.
Termination must be
Type SF2 or SF3. Tolerance on diameter ±.0005.
Available on:
| Finished diameters after grinding will be: | |
| 1/4" = .2450 | 3/4" = .7430 |
| 3/8" = .3700 | 15/16" = .9300 |
| 1/2" = .4950 | 1" = .9930 |
| 5/8" = .6200 | 1 1/4" = 1.240 |
SF37: Special alloy sheathing. Consult factory for availability before ordering.
SF37A: 347 Stainless steel.
SF37B: 321 Stainless steel.
SF37C: Inconel.
SF37D: Titanium.
Available on:
SF38: Passivated finish for corrosion resistance.
Available on:
SF39: Teflon coating for corrosive conditions. Termination must be type SF2 or SF3.
Available on:
[ HOME ] [ Stock List ] [ Stock Modifications ] [ Salesman ] [ Manufactured List ] [Technical Index ]
[ Air ]
[Band ]
[Ceramic ]
[Crankcase]
[ Foil ]
[Glasrope]
[ Strip ]
[Tubular/Tubular
Immersion ] [ Miscellaneous ]
Cartridge Heaters: [ Immersion ]
[ Special
Immersion ] [ Metric ]
[ Square/Rectangular
] [ Superwatt High
Watt ]
 |
We can be reached by
e-mail at sales@hotwatt.com |