Ogden Mighty Watt Cartridge Heaters

 

The Ogden Mighty Watt is an elite category of high density cartridge heaters. No other swaged cartridge heater is compacted to the extent of the Mighty Watt, producing excellent heat transfer capability and the dielectric and physical strength necessary for long life and outstanding performance. The Mighty Watt is designed for applications where high operating temperatures are required, or where heaters are subjected to vibration. Because the construction allows maximum heat transfer and high temperatures, it is possible to use fewer heaters at higher watt densities to reduce space requirements. The Mighty Watt is available from 1/8″ to 1-1/4″ diameters in just about any conceivable increment. With designed-in quality and reliability, the Mighty Watt is the ideal heat source for any process.
Computer generated manufacturing specifications
Nickel-Chromium resistance wire precisely wound on a Magnesium Oxide core
Exact centering of the core and closeness of windings to the sheath ensures efficient heat transfer and lower internal temperatures
Heavy wall Incoloy or 304 Stainless Steel sheath provides for maximum protection against high temperature oxidation and corrosion
Bottom Slug is TIG welded to the sheath to prevent contamination
High purity Magnesium Oxide is thoroughly compacted and the entire assembly is swaged to the ideal density to create a heavier mass than other cartridge heaters for the best possible heat transfer
High density cap seals Magnesium Oxide in place and resists contaminationMIGHTY WATT PLUS (U.S. Patent# 5,034,595)

The Mighty Watt Plus allows one of nine lead modifications to be added to any of over 700 Mighty Watt Cartridge heater sizes and ratings available from stock. This creates many thousands of possible combinations-shipped within 2 days! Rather than waiting through normal lead times or inventorying numerous spare parts, the exact item necessary can be on the job quickly…essential for meeting today’s manufacturing requirements. The Mighty Watt Plus modification can be added to any stock item in 1/4″, 3/8″, 1/2″, 5/8″ or 3/4″ diameter with any lead length desired. All Mighty Watt Plus items use high temperature lead wire rated to 850F(450C).Any of the Mighty Watt Plus modifications can be added to the base cartridge heater. With minimal sheath extension, several styles of lead protection, fully flexible or other lead designs can be applied virtually as quick as the standard crimped-on lead connection. Just locate in the current Ogden Stock List an appropriate cartridge heater…for instance, a MWEJ05A0101 at 500 watts, 240V (1/2″ diameter by 5″ long). 48″ right angle protected leads are desired. Choose from stainless steel flexible braided or stainless steel armor cable. Add the Figure Suffix to the catalog number and the lead length in feet and the order is ready to proceed. In the preceding example, if the lead style selected was 48″ of the right angle stainless steel braid (Fig. G-suffix letter code “G”) the ordering number would be:

MWEJ05A0101-G4

For right angle armor cable (Fig. D-suffix letter code “D”) the ordering number would be:

MWEJ05A0101-D4

The numerical suffix code designation is the lead length in feet. Note the extension dimensions from the information in the following pages to be certain the overall length does not exceed the physical space available.

 


T
he “MW” series is the foundation of all the variations shown on the following pages. A heavy duty double crimp connects lead wires to solid nickel pins. Connections are insulated with sleeving. Maximum temperature at the lead area is 400 F/200 C. Standard lead length is 12″. Specify additional length. The “MW” is the standard design for all diameters (except 1/8″).


FIG. X HIGH TEMPERATURE FULLY FLEXIBLE LEADS

The Fig. X modification is high temperature, fiberglass braided, mica tape insulated lead wires internally connected and swaged in place. Fully flexible from the exit of the sheath, the high temperature (850 F/450 C) lead wires are ideal for applications where spacing is limited and flexing occurs. On the Fig. X Mighty Watt Plus, the modification adds 1/4″ to the sheath length of stock items. 12″ leads are standard specify additional length.

* At lead end. Standard cold sections can be increased. Consult BigChief for metric diameter dimensions.

Fig. X Flexible Leads
Dia. Standard Unheated Area*
1/8″ 3/8″
1/4″ 1/2″
5/16″ 1/2″
3/8″ 9/16″
1/2″ 5/8″
5/8″ 11/16″
3/4″ 7/8″
15/16″ 7/8″
1″ 7/8″
1-1/4″ 7/8″

5/8″ total cold section at lead end

2 Day Shipment Mighty Watt Plus Fig. X Flexible Leads
Dia. Adds to Lengh
1/4″ 1/4″
3/8″ 1/4″
1/2″ 1/4″
5/8″ 1/4″
3/4″ 1/4″
Ordering Number Example:
From Current Stock List:
1/2″ x 5-3/4″ 1000W 240V
MWEJ05N0116
Add 24″ Fig. X Leads
MWEJ05N0116-X2
(overall length now 6″)

STAINLESS STEEL ARMOR CABLE LEAD PROTECTION

Stainless steel armor cable is the best protection for use where lead wires experience abrasion. See chart below for the additional dimension the Mighty Watt Plus Figure A and D add to the sheath length of stock items. When ordering non-stock Fig. A and Fig. D items, specify the overall sheath length. 14″ high temperature (850 F/450 C) leads with 12″ cable is standard specify additional length.

* At lead end. Standard cold sections can be increased. Consult BigChief for metric diameter dimensions.

Non-Stock Armor Cable Protection
Dia. Minimum Unheated* Cable
O.D.
Fig. A Fig. D
1/8″
1/4″ 1-1/2″ 1-1/2″ 1/4″
5/16″ 1-1/2″ 1-1/2″ 1/4″
3/8″ 1-1/2″ 1-1/2″ 3/8″
1/2″ 1-1/2″ 1-1/2″ 3/8″
5/8″ 1-9/16″ 1-9/16″ 1/2″
3/4″ 1-7/8″ 1-7/8″ 1/2″
15/16″ 1-7/8″ 1-7/8″ 1/2″
1″ 1-7/8″ 1-7/8″ 1/2″
1-1/4″ 1-7/8″ 1-7/8″ 1/2″
Ordering Number Example:
From Current Stock List:
1/2″ x 5-3/4″ 1000W 240V
MWEJ05N0116
Add 36″ Fig. A Leads
MWEJ05N0116-A3
(overall length now 6-1/4″)
Using the same item, add 48″
Fig. D leads
MWEJ05N0116-D4
(overall length now 6-1/2″)

.

Add 3/8″ to above dimension for total cold section at lead end.

 

STAINLESS STEEL BRAIDED LEAD PROTECTION

Swaged-in double conductor stainless steel braid is internally connected for strength and full length flexibility. See chart below for the additional dimension the Mighty Watt Plus Figure F and Figure G adds to the sheath length of stock items. For non-stock single conductor braided lead protection, specify Figure H for straight exit, Figure J for right angle. When ordering non-stock Fig. F, G, H or J items, specify the overall sheath length. 14″ high temperature (850 F/450 C) leads with 12″ braid is standard. Specify additional length.

* At lead end. Standard cold sections can be increased. Consult BigChief for metric diameter dimensions.

Non-Stock Braided Lead Protection
Dia. Minimum Unheated*
Fig. F/H Fig. G/J
1/8″
1/4″ 1″ 1″
5/16″ 1″ 1″
3/8″ 1-1/2″ 1-1/2″
1/2″ 1-1/2″ 1-1/2″
5/8″ 1-9/16″ 1-9/16″
3/4″ 1-7/8″ 1-7/8″
15/16″ 1-7/8″ 1-7/8″
1″ 1-7/8″ 1-7/8″
1-1/4″ 1-7/8″ 1-7/8″

Add 3/8″ to above dimension for total cold section at lead end.

2 Day Shipment Mighty Watt Plus Braided Lead Protection
Dia. Adds to Length
Fig. F Fig. G
1/4″ 1/2″ 9/16″
3/8″ 1/2″ 9/16″
1/2″ 1/2″ 5/8″
5/8″ 1/2″ 5/8″
3/4″ 1/2″ 5/8″
Ordering Number Example:
From Current Stock List:
1/2″ x 5-3/4″ 1000W 240V
MWEJ05N0116
Add 24″ Fig. F Leads
MWEJ05N0116-F2
(overall length now 6-1/4″)
Using the same item, add 60″
Fig. G leads
MWEJ05N0116-G5
(overall length now 6-3/8″)

RIGHT ANGLE FLEXIBLE LEADS

Figure R is used when spacing requirements are limited. See chart below for the additional dimension the Mighty Watt Plus adds to the sheath length of stock items. When ordering non-stock Fig. R, specify the overall sheath length. High temperature (850 F/450 C) leads are fully flexible from the exit of the sheath. 12″ lead wire is standard. Specify additional length.

* At lead end. Standard cold sections can be increased. Consult BigChief for metric diameter dimensions.

Non-Stock Right Angle Leads –
Fig. R
Dia. Minimum Unheated*
1/8″
1/4″ 1″
5/16″ 1-1/2″
3/8″ 1-1/2″
1/2″ 1-1/2″
5/8″ 1-9/16″
3/4″ 1-7/8″
15/16″ 1-7/8″
1″ 1-7/8″
1-1/4″ 1-7/8″

Add 3/8″ to above dimensions for total cold section at lead end.

2 Day Shipment Mighty Watt Plus Right Angle Leads – Fig. R
Dia. Adds to Lengh
1/4″ 9/16″
3/8″ 9/16″
1/2″ 5/8″
5/8″ 5/8″
3/4″ 5/8″
Ordering Number Example:
From Current Stock List:
1/2″ x 5-3/4″ 1000W 240V
MWEJ05N0116
Add 24″ Fig. R Leads
MWEJ05N0116-R2
(overall length now 6-3/8″)

UNHEATED SHEATH EXTENSION

Figure U adds an unheated area to the lead end of stock Mighty Watt Cartridge Heaters. Any practical length greater than 1/2″ can be selected. The standard lead configuration is with 12″ fully flexible high temperature (850 F/450 C) leads. Specify longer length if required. Figure U can also include braided or armor cable protected leads. Consult BigChief. Non-stock Mighty Watt Cartridge Heaters can be designed and manufactured with practically any unheated area.

UNHEATED SHEATH EXTENSION WITH EPOXY SEAL


Fig. E – Shown are the same
Mighty Watt Cartridge Heaters
modified from stock with 3/4″,
1-1/4″ and 1-3/4″ long sheath
extension, Fig. E Epoxy seal
and Teflon leads.
Figure E provides an epoxy seal to protect Mighty Watt cartridge heaters from the contaminates that cause early failure. Typically supplied with 12″ Teflon leads. Specify longer length. Maximum temperature at lead end 300 F/150 C.

Figures U and E
Sheath Extension (Typical) Total Unheated Length at Lead End
Fig. U Fig. E Fig. U Fig. E
1/2″ 1″ 7/8″ 1-7/8″
1″ 1-1/2″ 1-3/8″ 2-3/8″
1-1/2″ 2″ 1-7/8″ 2-7/8″
2″ 2-1/2″ 2-3/8″ 3-3/8″
2-3/4″ 3-1/4″ 3-1/8″ 4-1/8″
3-1/2″ 4″ 3-7/8″ 4-7/8″

Fig. U and Fig. E Ordering Instructions
Select Mighty Watt Cartridge Heater from stock, specify the necessary cold length, the type of termination and the lead length. Fig. E can also be manufactured to specification if size or rating required is not available from stock.


CARTRIDGE IMMERSION HEATER

Figure M is a brass, steel or stainless steel pipe fitting which allows liquid tight installation through threaded openings. Fittings are brazed. For welded fittings and other cartridge immersion heater variations, scroll along this section. Be certain the watt density and sheath material are compatible with the material being heated.

Diameter Pipe Size NPT Pipe Fitting Length
1/4″ 1/8-27 5/8″
3/8″ 1/4-18 5/8″
1/2″ 3/8-18 3/4″
5/8″ 1/2-14 13/16″
3/4″ 3/4-14 15/16″
Stock Sheath Length Is Immersion Length

Fig. M Ordering Information
Select Mighty Watt Cartridge Heater from Stock, brass, steel or stainless steel pipe fitting and size, type of termination and lead length.

MIGHTY WATT WITH INTERNAL THERMOCOUPLE


The Mighty Watt with internal thermocouple is for applications where monitoring the internal temperature of the heater is necessary as over-heat protection or where material flow is close to the heater sheath as in plastic molding. 12″ high temperature (850 F/450 C) leads are standard. When ordering, specify whether the junction is grounded or ungrounded. The standard position for either a grounded or ungrounded junction is at the bottom. For other positions, consult BigChief. Mighty Watt Cartridge Heaters are also available with built-in snap action thermostats.

MOISTURE AND CONTAMINATION RESISTANT LEADS

Fig. T-Teflon Seal
Swaged in Teflon seal and leads resist oil and water up to 482 F/250 C maximum application temperature. Available in Mighty Watt construction in 1/4″, 3/8″ and 1/2″ diameters. Minimum unheated area at lead end is 1″. Standard lead length is 12″.

THREADED TERMINALS

Screw terminals facillitate ease of connection using lug terminals, standard leads or bus bar.Fig. Y is available in 1/2″, 5/8″, 3/4″, 15/16″, 1″ and 1-1/4″ diameters. Standard terminals are 8-32 x 58″. Other terminal sizes are available. Consult BigChief.

PLUG TERMINATION


U.L. Listed Plugs are available attached to heater by cord, cable
or leads.
U.L. Listed Plugs are available attached to heater by cord, cable or leads.

Matching receptacles are also available

Manufacturer Number Ogden Number NEMA Ref.
Leviton 515PA PC4326-27 5-15P
Eagle 2866 PC4326-281 6-15P
Arrowhart 4771 PC4326-50 L7-15R
Leviton 5444 PC4326-29 5-20P
Hubbell 2311 PC4326-25 L5-20P
Eagle

FLANGED HEATERS


Mighty Watt Cartridge Heaters can be manufactured with flanged located at any point along sheath with adequate unheated area. Type W flanged can also be attached to Fig. U unheated section on stock items.

CONDUIT COUPLER PROTECTION

Flexible conduit is attached with a copper coupler over-lapping the heater by 1/4″. Leads are 14″ long and cable 12″ unless specified.
Fig. 1B and 1C can be attached to stock items.

* Standard cold sections can be reduced or increased

Diameter Minimum Unheated*
Fig. 1B Fig. 1C
1/4″ 1/8″ 1/8″
3/8″ 7/8″ 7/8″
1/2″ 7/8″ 7/8″
5/8″ 7/8″ 7/8″
3/4″ & larger 7/8″ 7/8″
Diameter A B Cable O.D.
1/4″ 3/4″ 7/8″ 1/4″
3/8″ 3/4″ 15/16″ 3/8″
1/2″ 1″ 1-3/16″ 3/8″
5/8″ 1-1/16″ 1-7/16″ 1/2″
3/4″ & larger 1-5/16″ 1-7/8″ 1/2″
.
Additional Variations
Special Wattage Distribution. Specify percentage of overall wattage and length for each section. Typically, the entire lenght is divided into thirds with the overall wattage split into the following percentages: 40% at lead and bottom third of length with 20% in the middle, or, 35% at lead and bottom third of length with 30% in the middle.
Fiberglass Sleeving
Teflon Sleeving
Formed – Consult BigChief
Centerless Grinding of Sheath to Precision Diameter
Passivation
Special Unheated Area
Ground Lead
Ceramic Bead Insulation
Built-in Thermostat or Thermal-Fuse

BULLET CARTRIDGE HEATERS


O
gden’s economical Bullet Heater is designed for high volume production, for low to medium watt densities to 100 watts per square inch and 1000 F sheath temperature. The swaged construction offers efficient operation and long life for applications where the high watt density capabilities of the Mighty Watt are not necessary. The BL Series features 12″ flexible lead wires mechanically crimp connected to solid nickel pins. The BX Series offers 12″ fully flexible fiberglass insulated lead wires. Any lead configuration from Mighty Watt is available on the Bullet.

DRAIN HEATERS

Prevents drain line feeze-up in commercial frozen food cases
Swaged for long life
Molded neoprene connector
Stainless steel sheath
Plugs into fan receptacle and heats constantly
1/4″ O.D. allows drain water to flow freely

.

Available in 240V

Catalog Number Watts Volts Size
No. 2-2010 28W 120V 12″ overall
No. 2-26 25W 120V 8″ overall

CARTRIDGE IMMERSION HEATERS

The following is a representative list of Cartridge Immersion Heaters available. Part numbers shown are for Figure M. Specify with cable and length required for Figure MC.

Watt density must be suitable for the liquid being heated. See applications data for correct sheath material and watt density limitations. Fittings are available in brass, steel and stainless steel materials. Brass and steel pipe fittings are silver-soldered and stainless steel heliarc welded. Also available with 3-1/2″ Octagon terminal box. When ordering, specify:

Diameter and material of heater Lead length and type
Size, material and type of pipe fitting Wattage and voltage
Immersion depth (“B” dimension)

* Distance across flats** Reference Dimensions

Heater Dia. Pipe Size N.P.T. Dimensions
A* C** D
1/4″ 1/8-27 7/16 5/8
3/8″ 1/4-18 5/8 5/8 1-7/16
1/2″ 3/8-18 11/16 3/4 1-7/16
5/8″ 1/2-14 13/16 13/16 1-15/16
3/4″ 3/4-14 1-1/16 15/16 2
15/16″ 1-11-1/2 1-3/8 1-3/16 2-1/4
1″ 1-11-1/2 1-3/8 1-3/16 2-1/4
1-1/4″ 1-1/4-11-1/2 1-3/4 1-3/16 2-1/2
Dimensions Wattage Voltage Watt Density Catalog Number
Dia. B Pipe Size
5/8″ 1-3/4″ 1/2″ 100 120 30 MWEL01N0136
5/8″
5/8″
5/8″
5/8″
3-3/4″
3-3/4″
3-3/4″
3-3/4″
1/2″
1/2″
1/2″
1/2″
150
150
250
250
120
240
120
240
20
20
35
35
MWEL03N0137
MWEL03N0138
MWEL03N0139
MWEL03N0140
5/8″
5/8″
5/8″
5/8″
8″
8″
8″
8″
1/2″
1/2″
1/2″
1/2″
300
300
500
500
120
240
120
240
25
25
40
40
MWEL03A0141
MWEL03A0142
MWEL03A0143
MWEL03A0144
5/8″
5/8″
5/8″
5/8″
12″
12″
12″
12″
1/2″
1/2″
1/2″
1/2″
500
500
750
750
120
240
120
240
25
25
40
40
MWEL12A0145
MWEL12A0146
MWEL12A0147
MWEL12A0148
3/4″
3/4″
3/4″
3/4″
5″
5″
5″
5″
3/4″
3/4″
3/4″
3/4″
200
200
300
300
120
240
120
240
17
17
25
25
MWEN05A0092
MWEN05A0093
MWEN05A0094
MWEN05A0095
3/4″
3/4″
3/4″
3/4″
6-1/2″
6-1/2″
6-1/2″
6-1/2″
3/4″
3/4″
3/4″
3/4″
300
300
500
500
120
240
120
240
18
18
30
30
MWEN06J0096
MWEN06J0097
MWEN06J0098
MWEN06J0099
3/4″
3/4″
3/4″
3/4″
10-3/4″
10-3/4″
10-3/4″
10-3/4″
3/4″
3/4″
3/4″
3/4″
500
500
750
750
120
240
120
240
20
20
30
30
MWEN10N0100
MWEN10N0101
MWEN10N0102
MWEN10N0103
3/4″
3/4″
3/4″
3/4″
13-3/4″
13-3/4″
13-3/4″
13-3/4″
3/4″
3/4″
3/4″
3/4″
600
600
1000
1000
120
240
120
240
18
18
30
30
MWEN13N0104
MWEN13N0105
MWEN13N0106
MWEN13N0107

SPECIFICATIONS & LIMITATIONS

Mighty Watt Swaged Cartridge Heaters

Nom.
Dia.
In.
Actual
Dia.
In.
Maximum Wattage Minimum Wattage (MW) Max. Amps
120V 240V 1″ Length 1-1/2″ Length 2″ Length MW MX
MW MX MW MX 120V 240V 120V 240V 120V 240V
1/8 .121 325 650 16 64 10 40 2.7
1/4 .246 500 400 1,000 800 20 80 15 60 10 40 4.3 3.3
5/16 .308 900 500 1,800 1,000 15 60 12 48 10 40 4.3 4.2
3/8 .371 900 800 1,800 1,650 15 60 10 40 5 20 7.5 7.0
1/2 .496 1,250 1,050 2,500 2,150 10 40 8 32 5 20 10.5 9.0
5/8 .621 2,200 1,500 4,400 3,000 8 32 5 20 3 12 18.5 12.5
3/4 .746 3,000 1,950 6,000 3,950 10 40 8 32 25 16.6
1 .996 3,250 2,350 6,400 4,650 8 32 5 20 27 19.5
1-1/4 1.245 3,250 2,350 6,400 4,650 8 32 5 20 27 19.5
TOL ± .002* * Diameter Tolerance on 1 and 1-1/4, ± .003
Lead Length: 36″ maximum on MX heaters. Additional lead length can be spliced.
Resistance Tolerance: +10%, -5%.
Wattage Tolerance: +5%, -10%.
Cold Resistance: 3% Lower than Hot Resistance.
Length Tolerance: ±3/32″ up to 4-1/2″ long. Above 4-1/2″; ±2%.
Camber Tolerance: .0016″ per inch of length. In longer heaters larger camber may occur.
Standard Unheated Section: 3/8″ at lead end, 3/8″ at bottom on MW style. See corresponding description for cold section at lead end for all lead variations. Cold sections can be reduced or increased.
1/8″ Diameter Tolerances: Wattage; +10%, -15%. Length over 4-1/2″; ±3%
Other diameters available: 7/16″ and 11/16″.

Mighty Watt Metric Swaged Cartridge Heaters

Nom.
Dia.
mm
Actual
Dia.
mm
Maximum Wattage Minimum Wattage (MW) Max. Amps
120V 240V 25mm Length 38mm Length 51mm Length MW MX
MW MX MW MX 120V 240V 120V 240V 120V 240V
6.5 6.4 500 400 1,000 800 20 80 15 60 10 40 4.3 3.3
8.0 7.9 900 500 1,800 1,000 15 60 12 48 10 40 4.3 4.2
10.0 9.91 900 800 1,800 1,650 15 60 10 40 5 20 7.5 7.0
12.5 12.4 1,250 1,050 2,500 2,150 10 40 8 32 5 20 10.5 9.0
16.0 15.88 2,200 1,500 4,400 3,000 8 32 5 20 3 12 18.5 12.5
20.0 19.9 3,000 1,950 6,000 3,950 10 40 8 32 25 16.5
TOL ± .05mm
Lead Length: 900mm maximum on MX heaters. Additional lead length can be spliced.
Resistance Tolerance: +10%, -5%.
Wattage Tolerance: +5%, -10%.
Cold Resistance: 3% Lower than Hot Resistance.
Length Tolerance: ±2.4mm up to 115mm long. Above 115mm; ±2%
Camber Tolerance: .16mm per 100mm of length. In longer heaters larger camber may occur.
Standard European tolerances available – consult BigChief
Other.Metric.Diameters.Available
Diameter mm Actual mm
6.0
12.0
15.0
19.0
25.0
5.89
11.89
14.89
18.90
24.90

Tolerance ± .05MM

Bullet Swaged Cartridge Heaters

Nom.
Dia.
In.
Actual
Dia.
In.
Maximum Wattage Minimum Wattage (BL)
Max. Amps
120V 240V 1-1/4″ Length 1-1/2″ Length 2″ Length
BL BX BL BX 120V 240V 120V 240V 120V 240V
3/8 .371 720 650 1,440 1,320 20 80 15 60 10 40
6
1/2 .496 1,200 900 2,400 1,800 10 40 8 32
8
5/8 .621 1,800 1,250 3,600 2,500 10 40 8 32
10
3/4 .746 2,400 1,550 4,800 3,100 10 40 8 32
14
1 .996 3,250 2,350 6,400 4,650 8 32 5 21
18
TOL ± .002 Diameter tolerance on 1″, .05MM .003
Watt Density: 100w/sq.in. maximum
Lead Length: 36″ maximum on BX. Additional length can be spliced.
Resistance Tolerance: +10%, -5%.
Wattage Tolerance: +5%, -10%.
Cold Resistance: 3% Lower than Hot Resistance.
Length Tolerance: ±3/32 up to 4-1/2″ long.
Above 4-1/2″; ± 2%.
Camber Tolerance: .0016″ per inch of length. In longer heaters larger camber may occur.
Standard Unheated Section: 1/2″ at lead end, 1/4″ at bottom

ALLOWABLE MAXIMUM WATT DENSITY

How to Order:
1. When ordering Cartridge Heaters specify:
a. Overall Length
b. Heated Length
c. Nominal Diameter
d. Lead Figure
e. Lead Length
f. Voltage and WattageDiameter and length are determined by the space available and the requirements for even heat distribution. The standard leads consists of staggered 1″ and 1-1/2″ nickel pins.
3. Determine: Fit = maximum inside diameter of hole minus minimum O.D. of sheath
Example: a 3/8″ Cartridge Heater in a .375 ± .001 reamed hole would have a .007 fit .376 – .369 = .007Check the required temperature against the watt density and fit indicated on the graph above.
2.

Example:

a 3/8″ diameter Mighty Watt, 3″ long overall (with standard 3/8″ cold end), rated at 300 watts
.371 x 3.14 x 2-1/4″ = 2.63 sq. in. heated area.
4. To extend heater life:
A. Decrease the watt density by:

1. increasing the diameter
2. increasing the heated length
3. increasing the number of units used
4. reducing the wattage, allowing for longer heat-up time.

B. Use a tighter fit.
C. Consult BigChief for alternative design recommendations.


SELECTION OF OGDEN CARTRIDGE HEATERS

See separate listing for Stock Cartridge Heaters.
Heater life is a function of several variables: operating temperature, heater fit, control, heat absorptivity characteristics of material being processed, watt density, contamination, etc.
Immersion Heaters
Immersion Heaters are intended to be used in liquids at all times. The heated portion must always be immersed. Sheath must be free of grease or foreign material for adequate thermal conductivity. Protect terminals from contaminants.
Fit Tolerances
The hole into which a cartridge heater is inserted, should be reamed to the nominal diameter of the heater. Might Watt and Bullet Heaters are .002″ – .006″ undersized. If close hole tolerances are not maintained, operating life of the heater will be reduced. The heated area of the cartridge should not extend beyond the hole. See watt density graphs.
Spacing
As a general rule, it is not recommended to space heaters in a die or platen any closer to each other than the diameter of the heater.
Contamination
Contamination consists of any foreign matter such as plastic, oil, grease, dirt or water entering through the terminal end.
Proper Care and Maintenance
1.
Heaters should be stored in a dry area, especially during periods of high humidity.
2. Protect leads from abuse and abrasion.
3. Maintain temperature control and accessories in good working condition to avoid over temperature operating conditions.
4. All cartridge heaters (especially of swaged design) have hygroscopic tendencies and can accumulate moisture in shipping and storage. Low heater insulation (less than 1 meg ohm) can be baked in an oven for several hours or started at low voltage to eliminate moisture.
Removal
Removal of heaters from one die to another is not recommended.
Testing Information
Quality control standards on Ogden Cartridge Heaters include the following inspection procedures;
1. Resistance test.
2. Voltage breakdown test (Hypot)
3. Inspection of physical size.