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ManualsBrandsCALORITECH ManualsBuilding materialsCXF Series 5,118 BTU Screwplug Immersion Electric Heater, 2 in. NPT, 1.5 kW, 120-Volt, Explosion-Proof Terminal Housing

Caloritech™

Screwplug Heaters – CX

Selection

Proper selection of the screwplug heater is required to maximize service

life. Once the wattage requirement is established decide on heater

voltage and phase. Remember that unrealistic heat-up time requirements

will increase equipment and operating costs.

The tables list, under “watt density”, the required heat transfer rate from

the various heaters. Refer to Section D of the Caloritech™ catalog for

guidance on the acceptable watt density for your application. If a heater

is not listed with the density you require we can fabricate to suit.

Of equal importance is the selection of the materials of construction

which will resist corrosion and not wear away or contaminate the liquid.

Refer to the corrosion guide in Section D for a list of the standard

materials for various solutions. Also see page B26 for discussion on

wattdensity.

The heaters are not guaranteed against corrosion since Thermon

Heating Systems has no control over the liquid type, concentration or

temperature of the solution. Consult your factory representative or your

chemical supplier for recommendation on materials for your solution.

Recommendations are not implied guarantees.

Warning - Fire Hazard

The heaters listed in the catalog may occasionally malfunction in

normal use and if operated in the presence of explosive or combustible

materials may cause res. Do not operate in the presence of explosive or

combustible materials. Observe re prevention precautions and consult

the local sales ofce or contact Thermon Heating Systems for proper

application and installation instructions.

The thermostat controls function as temperature controls. Because they

do not fail safe, an approved temperature and/or pressure safety control

may be required for safe operation. Inclusion of consumer warnings

on assembled products containing these elements and thermostats is

recommended.

Application

Screwplug heaters are primarily used to heat liquids in tanks or vessels.

To do so safely and reliably requires that the heating elements remain

fully immersed in the liquid. Liquids such as water, oils, trichlorethylene,

etc. can be heated through natural convection currents created by the

immersed elements.

Although electricity costs are generally higher than gas or oil, it can be

demonstrated that a Caloritech™ immersion heater is often your best

choice. The electric heater provides close to 100% efciency, is safer

and easier to control and is usually cheaper to install.

Terminal Block Simplifies Wiring

All thermostat equipped screwplug heaters with moisture or

explosion-proof housings feature a convenient terminal block mounted

to a slide out trolley.

This unique Caloritech™ feature simplies installation and reduces

maintenance.

Installation

Listed heaters have standard 1" to 2 1/2" NPT tapered plugs. Any other

size or type of plug is available on special order. The heater is installed

through a threaded half coupling located in the vessel wall well below

the minimum liquid level but spaced sufciently above the bottom to

allow for sludge build-up which should never be allowed to cover any

part of the elements.

Horizontal installation is preferred even though heater replacement will

require draining of the tank. Vertical installation is sometimes possible

but it is best that you contact the factory for advice prior to purchase.

Operation

For an immersion heater to transfer heat it must establish a balance

between convection currents and the temperature difference between

itself and the liquid. Viscous liquids which retard convection currents

are the most difcult to heat. Care must be exercised to ensure that

the required rate of heat transfer from the heating elements is achieved

without overheating the element and the liquid resulting in coking. This

is generally achieved through the selection of heater watt density.

Heaters immersed in liquids, such as water with high calcium and

magnesium content, phosphates or eluate solutions, have a tendency

to precipitate their solids over the elements on heating. These heaters

require scheduled maintenance to remove scale build up which may

thermally insulate the elements and reduce their service life.

Screwplug Heaters - CX

Summary of content (17 pages)

PAGE 1
Screwplug Heaters - CX Application Selection Screwplug heaters are primarily used to heat liquids in tanks or vessels. To do so safely and reliably requires that the heating elements remain fully immersed in the liquid. Liquids such as water, oils, trichlorethylene, etc. can be heated through natural convection currents created by the immersed elements. Proper selection of the screwplug heater is required to maximize service life.
PAGE 2
Heaters with 1" and 1 1/4" Plugs To Order Specify Application • Quantity • Wattage • Catalog number • Special features • Voltage Type CXC heaters are used primarily for water heating and have brass screwplugs and copper sheaths. Type CXF are used primarily for oil heating and have steel screwplugs. Low watt density heaters are used in heavier, non-circulated oils. Higher watt density heaters are suitable for light oils or in forced oil circulation loops.
PAGE 3
Table 1 – Screwplug Heaters (One Element) - 1" NPT (Cont'd) Immersion Length 'B' kW in 0.30 Steel Plug 0.50 7.5 8.9 mm 190 225 Incoloy® Sheath 23 watts in² (3.4 watts cm²) 0.70 0.
PAGE 4
Table 2 – Screwplug Heaters (Two Elements) - 1 ¼" NPT Immersion Length 'B' 1.5 2.0 1.0 120 CXC215P1211 CXCT215P1211 CXC215P12R11 CXCT215P12R11 CXC215P12X11 CXCT215P12X11 5.7 145 208 CXC215P1221 CXCT215P1221 CXC215P12R21 CXCT215P12R21 CXC215P12X21 CXCT215P12X21 240 CXC215P1231 CXCT215P1231 CXC215P12R31 CXCT215P12R31 CXC215P12X31 CXCT215P12X31 7.3 13 285 330 Incoloy® Sheath Steel Plug 1.5 18 457 23 W/in² (3.4 W/cm²) 2.0 0.20 0.30 0.40 Incoloy® Sheath 0.
PAGE 5
Heaters with 2" and 2 1/2" Plugs B Application Type CXC heaters are used primarily for water heating and have brass screwplugs and copper sheaths. B Type CXF are used primarily for oil heating and have steel screwplugs. Low watt density heaters are used in heavier, non-circulated oils. Higher watt density heaters are suitable for light oils or in forced oil circulation loops. Incoloy® elements are silver brazed into a steel screwplug.
PAGE 6
Table 3 – Screwplug Heaters (Two Elements) - 2" NPT (Cont'd) Immersion Length 'B' kW in 4.0 5.0 Copper Sheath 6.0 17.7 21.7 25.6 mm 450 551 650 Brass Plug 54 to 60 W/in² (8.3 to 9.3 W/cm²) 8.0 10.0 12.0 1.5 2.0 32.5 39.4 47.2 7.9 7.9 826 1001 1199 201 201 Incoloy® Sheath Stainless Plug 54 to 60 W/in² (8.3 to 9.3 W/cm²) 3.0 5.0 17.7 21.
PAGE 7
Table 3 – Screwplug Heaters (Two Elements) - 2" NPT (Cont'd) Immersion Length 'B' kW in 6.0 Incoloy® Sheath 8.0 25.6 32.5 mm 650 826 Stainless Plug 54 to 60 W/in² (8.3 to 9.3 W/cm²) 10.0 12.0 1.5 2.0 Incoloy® Sheath 3.0 39.4 47.2 14 18 26 1001 1199 356 457 660 Steel Plug 23 W/in² (3.6 W/cm²) 4.0 Screwplug Heaters – CX 5.0 B10 6.
PAGE 8
Table 3 – Screwplug Heaters (Two Elements) - 2" NPT (Cont'd) Immersion Length 'B' kW in 1.5 2.0 14 18 mm 356 457 Incoloy® Sheath Stainless Steel Plug 3.0 26 660 23 W/in² (3.6 W/cm²) 4.0 5.0 6.0 1.0 34 42 50 17.
PAGE 9
Table 3 – Screwplug Heaters (Two Elements) - 2" NPT (Cont'd) Immersion Length 'B' kW in 1.0 1.5 17.7 25.6 mm Standard Voltages 1 Phase Only 450 650 Incoloy® Sheath Stainless Plug 15 W/in² (2.3 W/cm²) 2.0 3.0 32.5 39.
PAGE 10
Table 4 – Screwplug Heaters (Three Element) - 2" NPT (Cont'd) kW in 7.5 21.7 mm 551 Copper Sheath Brass Plug 54 to 60 W/in² (8.3 to 8.9 W/cm²) 9.0 12.0 3.0 25.6 32.5 17.7 650 826 450 Incoloy® Sheath Steel Plug 23 W/in² (3.6 W/cm²) 6.0 9.
PAGE 11
Table 4 – Screwplug Heaters (Three Element) - 2" NPT (Cont'd) kW in 1.5 17.7 mm 450 Incoloy® Sheath Steel Plug 15 W/in² ( 2.3 W/cm²) 3.0 4.5 32.5 39.
PAGE 12
Table 5 – Screwplug Heaters (Three Element) - 2 ½" NPT Immersion Length 'B' in 3.0 4.5 6.0 7.7 11.6 17.5 mm 195 295 445 Copper Sheath Brass Plug 7.5 21.5 545 54 to 60 W/in² (8.3 to 8.9 W/cm²) 9.0 12.0 18.0 32.3 39.
PAGE 13
Table 5 – Screwplug Heaters (Three Element) - 2 ½" NPT (Cont'd) Immersion Length 'B' in 3.0 4.5 6.0 7.7 11.6 17.5 mm 195 295 445 Incoloy® Sheath Stainless Steel Plug 7.5 21.5 545 54 to 60 W/in² (8.3 to 8.9 W/cm²) 9.0 Screwplug Heaters – CX 12.0 B16 15.0 18.0 Caloritech™ 25.4 32.3 39.
PAGE 14
Table 5 – Screwplug Heaters (Three Element) - 2 ½" NPT (Cont'd) Immersion Length 'B' in 3.0 Incoloy® Sheath 6.0 17.5 25.4 mm 445 645 Steel Plug 23 W/in² (3.6 W/cm²) 7.5 9.
PAGE 15
Table 5 – Screwplug Heaters (Three Element) - 2 ½" NPT (Cont'd) Immersion Length 'B' in 3.0 4.5 17.5 25.4 mm 445 645 Incoloy® Sheath Stainless Steel Plug 23 W/in² (3.6 W/cm²) 6.0 7.5 9.0 Screwplug Heaters – CX 1.5 B18 34 42 50 17.7 864 1067 1270 450 Incoloy® Sheath Steel Plug 15 W/in² (2.3 W/cm²) 3.0 Caloritech™ 32.
PAGE 16
Table 5 – Screwplug Heaters (Three Element) - 2 ½" NPT (Cont'd) Immersion Length 'B' in 4.5 39.2 mm 995 Incoloy® Sheath Steel Plug 15 W/in² (2.3 W/cm²) 6.0 1.5 3.0 51 17.7 32.5 1295 450 825 Incoloy® Sheath Stainless Steel Plug 15 W/in² (2.3 W/cm²) 4.
PAGE 17
Special Features (Check Factory) Heaters With Built-in Thermostats Special Thermostat Ranges All screwplug heaters listed are available with built‑in thermostats. Heaters with thermostats have a “T” added to their catalog no. prefix. Standard thermostat range is 50°F to 250°F (10°C to 120°C). Ratings are normally 25 amps at 240V single pole single throw. 600V thermostats and double pole thermostats are available on special order.