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We are an authorized distributor for Dalton Electric Heating Co., Inc.
We are an authorized distributor for Dalton Electric Heating Company, Inc. manufacturer of the Split-Sheath Cartridge Heater and Diff-Therm Diffusion Pump Heaters.
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Maximize Heat TransferThe unique split-sheath design of the Watt-Flex Cartridge Heater allows the independent, bilateral expansion of each half of the heater outward against the walls of the surrounding bore. The result is greatly improved heat transfer under normal fit conditions of .005" to .007", assuring superior heat transfer, more uniform process heat, greater efficiency, and reduced consumption of electricity. If bores are oversized from previous use and drill-outs, the bilateral sheath expansion will maximize heater-to-bore contact for the most efficient conduction heating.
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Watt Flex Cartridge Heaters Last LongerCartridge heater life is directly related to its internal
operating temperature. The result is Watt-Flex heaters that last up to 5 times longer, have less downtime and lower operating costs than conventional cartridge heaters. Efficient Heat Transfer
Conventional ceramic core cartridge heaters (shown below) use
multiple
Unlike conventional ceramic heaters, Watt-Flex heaters use a continuous heating coil to achieve a more uniform temperature profile. With Watt-Flex heaters, there are no independent heating element sections to burn out. Watt-Flex heaters are either totally on or totally off.
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Watt-Flex Cartridge Heaters Eliminate Bore Seizure
The patented split-sheath design of the Watt-Flex cartridge heater
reduces your heater change-out costs by preventing heater bore
seizure.
Dalton Electric will replace, free of charge, any Watt-Flex Heater that cannot be withdrawn from the bore.
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Watt-Flex Temperature ProfilesUnlike conventional cartridge heaters, Watt-Flex heaters use a continuous heating coil that allows for a more uniform temperature profile. By varying the watt-density, Watt-Flex heaters can also be configured for customized temperature profiles with varying zones of heat along the heater. Uniform Temperature ProfileUniform sheath temperature is vital when molding heat-sensitive plastics where the temperature window between gate freeze-off and material degradation is very narrow. The test results below highlight the superior temperature profile along the length of a torpedo probe heated by a Watt-Flex heater.Customized Temperature ProfileBy varying the watt-density, the temperature profile may be custom matched to your specific requirements. For example, certain applications such as those requiring
temperatures higher at the tip of a molding probe than along the sheath
can be accomplished with Watt-Flex heaters, but not with conventional
cartridge heaters. Or, watt density can be varied to compensate for |
Watt-Flex Cartridge Heaters
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Cartridge heater fit is measured as the difference between the inside diameter (I.D.) of the bore and the outside dimension (O.D.) of the heater. The suggested fit for a Watt-Flex Cartridge Heater is .007" greater than the nominal Watt-Flex heater sheath diameter. For example, the ideal bore diameter for a 1/2" diameter Watt-Flex heater would be 0.502 --> 0.505". At the maximum tolerance dimension of heater and the minimum bore diameter, the heater would have a 0.005" fit, allowing ease of insertion and removal. Generally, smaller diameter heaters benefit from a tighter fit and fit can be loosened for larger diameters. |
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External Thermocouples - an Exclusive Watt-Flex OptionWatt-Flex split-sheath cartridge heaters can be manufactured with a groove along the exterior of the cartridge to accommodate a needle-type thermocouple for more accurate temperature sensing and control.
Watt-Flex external thermocouples outperform internal monitors used
in conventional heaters. With Watt-Flex heaters, you can:
Measure temperature at the precise point of heat transfer.
Unlike conventional heaters with internal thermocouples that measure internal heater coil temperature, Watt-Flex external thermocouples measure more precisely at the point where heat transfers from the heater to the host metal.
Monitor temperature at any point along the heater.
Dalton Watt-Flex heaters give you the flexibility to monitor heat at
any point along the heater, instead of at pre-defined fixed points
with internal monitors in conventional heaters.
Replace heater or thermocouple independently.
With Watt-Flex external thermocouples, you can replace either the heater or the thermocouple independently, without having to replace an operational component as with conventional heater designs. Thermocouple SpecificationsMaximum lengths: 15" maximum for grooved heaters with 1/4" or 3/8"
diameter heaters. Longer heaters using 1/2" diameter or larger heaters, can be center- grooved between the legs to any depth between 6" to 15". Thermocouples:
Needle diameters:
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Watt-Flex Replaceable Immersion HeatersClean and safe. Easily replaced
without draining the vat or
tank.
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The flanged Watt-Flex cartridge heater is secured to the NPT fitting with two screws.
To replace the immersion heater, simply remove the screws, and slide out the de-energized heater.
Immersion Heater Specifications
Both the Watt-Flex Cartridge Heaters and Immersion Heaters are manufactured to customer specified lengths.
Immersion Heater
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Cartridge Heater
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Sheath O.D.
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NPT Fitting
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Diameter
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Length
(min-max) |
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5/8" | 3/4" | 1/2" | 5" - 45" | |
7/8" | 1" | 3/4" | 8" - 72" |
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Process Heating Engineering Data
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Heating Metal Parts | |
Calculate Process Heating Wattage Requirements | |
Physical Properties of Materials Table | |
Heating Liquids |
Heating Metal Parts The required wattage for a metal heating application is equal to the sum of watts required for material heat up plus watt loss during heat-up, plus a 20% safety margin added for contingencies. To calculate the heater capacity needed to produce a required level of heat, find the thermal values in the Physical Properties of Materials Table and plug them into the following equations:
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Calculation of Required Wattage
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A = | [Weight of Material (lbs.)] x [Specific Heat] x [Temperature Rise (F)] | ||
3.412 x Heat up Time (hours) | |||
B = | [Watt Loss per sq. in.] x [Area (Sq.In)] | ||
Physical Properties of Materials
Substance
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Specific Heat |
Heat of Fusion
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Lowest melting point
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Density
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Thermal conductivity
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Thermal Expansion
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Btu/lboF
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Btu/lboF
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oF
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lb/ft3
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lb/in3
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Btu/hr/
ft2/oF/ft |
inches per inch per oF x
10-6
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Aluminum 1100
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.24
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169
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1190
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169
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.098
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128
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13.1
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Aluminum 2024 |
.24
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167
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935
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173
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.100
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112
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12.9
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Aluminum 3003 |
.24
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167
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1190
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170
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.099
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112
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12.9
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Antimony |
.052
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69
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1166
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423
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.245
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10.9
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4.7 - 6.0
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Brass |
.10
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-
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1700ฑ
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525
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.304
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56
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11.1
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Carbon |
.204
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-
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6700
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-
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.080
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13.8
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.3 -> 2.4
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Copper |
.10
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91
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1981
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550
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.318
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224
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9.2
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Glass |
.20
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-
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2200ฑ
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165
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.096
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.45
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5
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Graphite |
.20
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-
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130
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.075
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.104
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-
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Incoloy800 |
.12
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-
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2475
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501
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.290
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8.1
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7.9
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Inconel 600 |
.11
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-
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2470
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525
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.304
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9.1
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7.4
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Invar |
.13
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-
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2600
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508
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.294
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6.1
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0.6
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Iron, Cast |
.13
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-
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2300ฑ
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450
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.260
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33
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6.5
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Iron, wrought |
.12
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-
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2800ฑ
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480
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.278
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36
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6.5
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Lead, solid |
.031
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10
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621
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710
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.411
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20
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16.3
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Lead, melted |
.04
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-
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-
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665
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.385
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-
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-
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Magnesium |
.232
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160
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1202
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109
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.063
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91
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14
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Monel 400 |
.11
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-
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2370
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551
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.319
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14
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7.7
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Nickel 200 |
.11
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133
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2615
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554
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.321
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39
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7.4
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Nichrome (80% Ni, 20% Cr) |
.11
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-
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2550
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524
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.303
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8.7
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7.3
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Solder (50%Pb, 50%Sn) |
.04
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17
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415
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580
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.336
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26
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13.1
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Steel, mild carbon |
.12
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-
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2550ฑ
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490
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.284
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38
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6.7
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Steel, stainless 304 |
.11
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-
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2550
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488
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.282
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8.8
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9.6
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Steel, stainless 430 |
.11
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-
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2650
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475
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.275
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12.5
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6.0
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Tin, solid |
.056
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25
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450
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455
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.263
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36
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13
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Tin, melted |
.064
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-
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-
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437
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.253
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18
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-
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Type Metal (85% Pb, 15% Sb) |
.040
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15
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500
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670
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.388
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-
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-
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Zinc |
.095
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51
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787
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445
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.258
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65
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9.4 - 22
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Heating Liquids
Consideration should be given to the following factors when heating liquids with Watt-Flex Cartridge heaters.
This page is Copyright ฉ 1997-2004 Dalton Electric Co., Inc. All Rights Reserved. Used with permission of Dalton Electric Co., Inc.
We are a Distributor of Industrial, Commercial and Residential Heaters and Controls. Always consult manufacturers installation instructions for proper installation of the products or systems shown on this website. ยฉ Copyright 1999-2019 Mor Electric Heating Assoc., Inc. MOR
ELECTRIC HEATING ASSOC., INC. |