Tubular heating elements for liquid

Backer tubular heating element is a well-tried and safe technical solution for liquid heating.

The Backer tubular heating element is the most frequent alternative when it comes to exact heating of fluids. Our supply of variants and processed products is immense and the elements are used as heating source in different appliances, such as electrical water heaters, dishwashers and washing machines, boilers, coffee machines, fryers, industrial baths and oil filled radiators.

The optimal solution for the required field of application is decided from what medium shall be heated, assembly of the element and power required.

 

PDF: TUBULAR HEATING ELEMENTS FOR LIQUID General info

>> Fields of application:

  • Washing machines
  • Heating pumps
  • Solar heating
  • Boilers
  • Dish washers
  • Towel heaters
  • Fryers
  • Industrial baths
  • Desinfectors

 

 

Tubular heating elements for liquid - Technical data:

 

Material Mild steel - Grade D
Stainless steel - AISI 304, AISI 316L, UNS S31254, UNS N08904, Incoloy 800, Incoloy 825
Dimensions

Ø 6,5 mm
Ø 8,5 mm
Ø 14 mm 
Ø 16 mm
Ø 18 mm
Ø 21 mm

Assembly

Inserted heating element with flange
Inserted heating element with screw plug
Heating element with nipple
Immersion heater
Casted element for contact assembly

Connection

Direct connection for installation in equipment
M4, M6, flat pin, spot welded cable, Ø 2.5 mm pin.
Terminal box with/without temperature regulating device

Design

One, two alt. three wattage ratings/element
Connection at one or two ends
According to customer specification
Standard range
Can be manufactured with UL, VDE approval

 

Standard tubular heating element

 

The following elements are held on stock, semi manufactured for faster delivery.

You will find information about bending options, cables and wiring, nipples e.g in dpf document under "download material". For more information or orders, please contact our industial departement.

When ordering we need to know if the element should be unsealed or, if it should be seald, in what way. (Of course we will help you with guidance if needed). t sätt (naturligtvis tipsar vi gärna om vilken typ som passar bäst för olika ändamål)

Element with other dimenstions, voltage etc. are manufactured acc. to customer specification.


Exempel of standard element: Type 9NL

 

 

TYPE

Tube Ø mm

Material Voltage V Power W Length mm
6N 4,5 6,4 R323 230 250-1500 400-1780
9 NL 8,5 AISI 321 230 75-175 900-2500
9NF 8,5 AISI 321 230, 400, 440 1000 2930-3430
9ND6 8,5 AISI 316L 230, 400 1000-4500 1160-3220
9N2,3 8,5 AISI 316L 230, 400, 290 330-2500 760-3665
9N3,5 8,5 AISI 316L 230, 400 500-3000 705-3230
9N5,5 8,5 R323 230, 400 500-4500 525-3100
14RV 14 AISI 321 230 400-1600 158-608
14NF 14 AISI 316L 230, 400, 440 650-3000 430-2830


Click on "type" for more information (at the moment only in swedish)

Examples of bending

 

PDF: Different suggestions of element bending


                                                                                                                  

Custom made product examples

 

Tubular heating elements insulation class I

- with integrated regulation

 

element med snabbanslutning till elektronisk styrbox Enkelisolerade rörelement

Tubular heating elements with insulation class I are used in product applications where earch connection is avaliable. Normally they are produced with one-end connection and options according to customer specification. If desired you also recieve guiding to the optimal heating solution for your product application.

>> Technical specification

Material AISI 321 (6.4, 14 mm)
AISI 304 (16 mm)
Steell DIN 2394
Dimension 250-2100 mm
Inactive length: 35-135 mm, depending on the coise of thermo regulation
Voltage Max 480V (With options below max 230 V)
Power 300-2000 W
Diameter 6.4, 14, 16 mm
Connection

Cable, tab terminal or round pin 1.5 or. 1.6 mm
Sealing "VO"-classified avaliable

Options Electronic controlbox with quick connection
Built-in thermostat 70-150°C
Meltfuse
Built-in thermistor (NTC)
Pcket tube for thermostat
PTC

 

>> Benefits
  • Integrated temperature regulation
  • Integrated thermal protector
  • Quick connection

 

>> Fields of applications
  • Towel dryers
  • Liquid filled radiators
  • Other liquid heating
  • Heating systems for trolley busses

 

PDF: Tubular insulation class I - technical data

                                                                                                                 

Double insulated heating elements

- with integrated regulation

Dubbelisolerade rörelement


We offer double insulated tubular heating elements with a variety of different options for regulation and thermal protection. If desired you also receive guiding to the optimal heating solution for your product application.

>> Technical specification

Material AISI 321/EN 1.4541(14 mm)
AISI 304/EN 1.4301 (16 mm)
Steel DIN 2394
Element lenght 250-2100 mm
Voltage Max 480V, (with options below max 230 V)
Power 300-2000 W
Diameter 16 mm or 14 mm
Connection

Cable, tab terminal or round pin 1.5 or. 1.6 mm
Sealing "VO"-classified avaliable

Options Electronic controlbox with quick connection
Built-in thermostat 70-150°C
Meltfuse
Built-in thermistor (NTC)
Pcket tube for thermostat

 

>> Benefits
  • Integrated temperature regulation
  • Integrated thermal protector
  • Double insulated

 

>> Fields of applications
  • Towel dryers
  • Liquid filled radiators
  • Other liquid heating
  • Heating systems for trolley busses

 

PDF: Tubular insulation class II - technical data

                                                                                                                

Screw plug immersion heater with galvanic insulated elements

Screw plug immersion heater for direct heating of liquids. The tubular elements are galvanic isolated from the screw plug. The galvanic insulation of the tubular element reduces the risk for electrical leakage and also contributes to a longer live time for the anode.

>> Teknical specification
Material Tube material, e.g.
AISI 316L/EN 1.4404
Incoloy 800/EN 1.4876
Incoloy 825/EN 2.4858
Dimension Ø 6.4, 8.5 mm
Insertion length acc. to customer spec.
Assembly Screw plug 1 ½ '', 2 ''
Connection Backers Terminal box K31 with integrated
thermostat and reset of thermal cut-off from the outside
Power Acc. to customer spec. up to 11 000 W
Voltage Max 480 V
Control
Backer 1- or 3-pole thermostat 30-90°C
Backers standard - 3-pole thermal cut off 110°C
Safety Meed requirements acc. to EN 60335-1
Protection klass IP54

 

>> Examples of applications
  • Domestic water boilers
  • All kinds of storage for liquid heating

 

PDF: Screw plug immersion heater - technical data

                                                                                                                

Immersion heater with electronic control

 

Immersion heater and terminal box with electronical setting of desired temperature and hysteres with an exact control via NTC. The display of the box show current temperature and with a flashing lamp, operating status of the heating elements is shown.

The terminal box offers a posibility for external control via e.g. a thermostat placed in the surroundings or via a central control unit. There is also a possibility to add specific operating alternatives and delayed power on/off. The box is also equipped with an integrated frost guard, which can be activated at need.

On request, the immersion heater can also be manufactured with galvanic insulated elements.

>> Technical specification
Article no not decided
Dimension 90x90x123 mm
Power/Voltage 230V 1~ alt. 400V 3~
Can handle11300W 3~ and 7360W 1~
Connections 1 ½’’, 2’’, 1 ½’ galvanic insulated, 1 1/4 ’’
Protection class IP54
Standard Electrical heat protection and thermal fuse
Surrounding temp. Max 55°C
>> Fields of Applications
  • Heating of fluids
  • Electrical water boilers
  • Accumulator tanks
  • Under foor heating
  • Process Industry

 

PDF: Immersion heater with electronic control - technical data

                                                                                                                 

Tubular element with mounted thermal fuse


>> Description


Most of Backer’s heating elements can be equipped with a thermal fuse. This design offers a big advantage when compared to a separately mounted thermal cut-off.

Elements with diam. 8.5 or 14 mm can be equipped with a replaceable thermal fuse. The silicone rubber bushing containing a thermal fuse is pulled out from the element with a suitable tool. A new unit is then easily mounted.
In elements with permanently mounted fuse the thermal fuse is moulded with compound at the sealing operation and is not replaceable. When the thermal fuse has tripped, the element must be replaced.

 

>> Technical data
Cut-off temperature To establish correct cut-off temperature, measurements have to be done under normal condition. The cut-off temperature is recommended to be at least 25-30°C above the maximum temperature of the thermal fuse at normal operation.
Connection With permanently mounted thermal fuses normal flat pin connectors can be used. As an alternative connection cables can be spot welded directly on the terminal pin. Round pin connectors are preferred when replacable thermal fuses are used.
Standard Heating elements with mounted thermal fuse are approved
by SEMKO, VDE och UL.
Safety Meet requirements acc. to EN 60335-1
Cut-off temp.
Stand Tol 0/-4°C
66, 72, 91, 98, 109, 128, 14, 152, 184, 216, 228°C
Tube diam Replaceable

Perm
mounted

Number of
fuses

Ø 6,4 mm

X

1

Ø 8,5 mm

X

X

1

Ø 14 mm/2

X

X

1-2

Ø 14 mm/3

X

X

1-3

>> Benefits
  • Compact design
  • No extra cable connection is required
  • Premounted inside the element
  • Reliable function, power is cut close to the heating source
  • Low total cost for the function

 

>> Examples of applications
  • Washing machines
  • Dish washers
  • Coffee machines
  • Photographic processors
  • Air heating with forced air flow

 

PDF: Mounted thermal fuse - technical data
PDF: Mounted thermal fuse - drawing

                                                                                                                 

Thermostat and manually resettable thermal cut-offs

- For mounting inside tubular heating elements

The tubular heating elements with diam 8.5 mm can be equipped with a thermostat and a resettable thermal cut-off, mounted at the end of electrical tubular heating element. Heating elements with mounted thermal cut-off and/or thermostat are approved by SEMKO, VDE och UL and are particularly suitable at liquid heating.

To determine the breaking temperature of the resettable cut-off it is advisable to measure the temperature under normal conditions and in intended application. The breaking temperature is recommended to be at least 25-30°C above the maximum temperature of the thermal cut-off at normal operation.

>> Technical specification

Thermostat Thermal cut-off
Type of design. BTS 085 060 (10) 130 BTC 085 060 (10) 130
Cutting temp. 60 (10) - 130°C 60 (10) - 130°C
Tolerance +/- 5°K +/- 10°K
Operation +/- 1°K +/- 1°K
Max power 250 V 250 V
Max current 10 A 12 A
Contact resistance < 20m Ω < 20m Ω
Surrounding temperature T 180°C T 180°C
Certificate Semko Certifikat No. 945010701 Semko Certifikat No. 982103601
Safety EN 60730-2-9:1995 EN 60730-2-9:1995
Connection Standard tab terminals or cables spot welded to the termianl pin
>> Benefits
  • Compact design
  • No extra cable connection is required
  • Premounted inside the element
  • Reliable function, power is cut close to the heating source
  • Low total cost for the function

 

>> Examples of applications
  • Dish washers
  • Washing machines
  • Photographic processors
  • Boilers
  • Coffee machines
  • Air heating with forced air flow

 

PDF: Manual resettable thermal fuse - technical data

                                                                                                                  

Fixing and connection devices

Savings in cost can often be made if elements are fitted with connection and fixing devices during manufacturing. Below you find the most frequent alternatives, which could be considered standard. We can also supply special flanges and alternative methods of fixing made completely to our clients' specifications.

When selecting connection and fixing devices it is often important to bear in mind the size of the series.

Types of cables and wiring

 

The tubular element can be eqiupped with connection that normally are spot welded on the thread. Choose from insulated or not. If not insulated, they can be provided with insulation hose. 

Specification (most common types)

Leading mat. Insulation mat. Max. operating temp.
Copper  - 180°C

Copper

Silicon 180°C
Copper Fibreglass/silicon 180°C
Nickel  - 400°C
Nickel Ceramic pearls 400°C
Nickel Fiberglas/silicon 200°C

 

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