Melt Bolt Thermocouples

TPM style melt bolt thermocouples are designed for dependable temperature measurement of the plastic melt stream within extruders and injection molding equipment. Durex manufactures standard thermocouple temperature sensors which are supplied with mineral insulated (MgO) sensing elements for extended pressure and temperature performance. Optional thermal barriers of Teflon® (500°F-260°C) and Mycalex® (900°F-482°C) are available upon request.

Melt Bolt Thermocouple with Standard Plug Style TPM0

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Part Number Configuration - Example:  TPM0-JG-030-P

TPM0 - TC TypeJunction"L" Dimension"B" Dimension

 

Melt Bolt Thermocouple with Plug and Stainless Steel Armor Style TPM1

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Part Number Configuration - Example:  TPM1-JG-030-P012

TPM1 - TC Type Junction"B" Dimension"A Dimension"

 

Melt Bolt Thermocouple with Standard Jack Style TPM2

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Part Number Configuration - Example:  TPM2-JG-030-P

TPM2 - TC TypeJunction"L" Dimension"B" Dimension

 

Melt Bolt Thermocouple with Jack and Stainless Steel Armor Style TPM3

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Part Number Configuration - Example:  TPM3-JG-030-P012

TPM3 - TC TypeJunction"L" Dimension"B" Dimension"A" Dimension

 

Melt Bolt Thermocouple with Spade Lugs and Stainless Steel Armor Style TPM4

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Part Number Configuration - Example:  TPM4-JG-030-P012

TPM4 - TC TypeJunction"L" Dimension"B" Dimension"A" Dimension

 

Melt Bolt Thermocouple with Spade Lugs & BX Connector Style TPM5

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Part Number Configuration - Example:  TPM5-JG-030-P012

TPM5 - TC TypeJunction"L" Dimension"B" Dimension"A" Dimension

 

Blank Bolts

Blank Bolt occupies hole when melt bolt thermocouple is removed. 3" or 6" standard lengths are available. 4" length is a custom order.

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Part Number "L" Dimension
244008 3" Bolt
244053 4" Bolt
244009 6" Bolt

 

Shop Our Online Store For Standard Designed Melt Bolt Thermocouples.

Thermocouple Types

Thermocouple Type Codes Limits of Error
E J K T Standard Limits
2 3 4 8 Special Limits

 

Junction Type

Code Single Junction
G Grounded
U Ungrounded

 

Dimensional Chart

"L" Dimensions "B" Dimensions "A" Dimensions Fractional Dimension
Letter Codes
“L” dimensions are specified in whole inches and a single alpha character which represents a fraction. Enter the three digit code as follows: “B” dimensions are specified in fractions from ⅛” to 1”. Use the single alpha character to indicate the tip length. Enter the code as follows: “A” dimensions are
specified in whole inches only. Enter the three digit code as follows:
1/16" A 11/16" L
1/8" B 3/4" M
3/16" C 13/16" N
1/4" D 7/8" P
5/16" E 15/16" R
3" 030 10 5/8" 10K 3/8" F 1" S
4 1/2" 04H 12" 120 1/8" B 5/8" K 9" 009 7/16" G 0 No
6 1/4" 06D 15 3/8" 15F 1/4" D 3/4" M 12" 012 1/2" H
7 7/8" 07P 17 3/4" 17M 3/8" F 7/8" P 36" 036 9/16" J
9 5/8" 09K 22 1/8" 22B 1/2" H 1" S 144" 144 5/8" K

 

Custom Options Available - Contact us for Engineering Assistance.

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Durexium™ Melt Bolt Sensor Coating

Durex Industries is pleased to offer Durexium™, a multilayer coating option for all melt bolt style temperature sensors. This multilayer coating consists of 16 different layers of Titanium Nitride and Zirconium Nitride, which is using a cathodic arc PVD process at a temperature of 800 °F.

Benefits:

  • Increase wear life of sensor by up to 12 times
  • Helps prevent material buildup on measuring surface
  • Improves ease of bolt removal
  • Available on all styles of Durex Melt Bolt Sensors
The alternating layers produce a synergistic effect that results in a Vickers hardness of over 4400 Hv. This enhanced hardness combined with the coatings superior abrasion resistance and lubricity results in wear life of up to 12 times longer than typical non-coated sensors. This option has been shown to be especially effective when extruding or molding plastics reinforced with glass fiber or other abrasive materials. Durexium™ coating has also been proven to be effective in extremely abrasive pet food extrusion equipment resulting in a drastic improvement in wear life over non-coated sensors.

 

Durexium Chart

 

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Thermocouple Wire Code Standards

Color-codes have been adopted by various national and international standard agencies for identification of thermocouple wire and thermocouple products. In the United States, thermocouple grade wire normally has a brown overall jacket. For Types B, R, and S the color-codes relate to the compensating cable normally used.

 

Type United States
ANSI 96.1
United Kingdom
BS 1843
Germany
43714
France
NF C42-323
Japan
JIS C1610-1981
E Purple
+ Purple
- Red
Brown
+ Brown
- Blue
Black
+ Red
- Black
Purple
+ Red
- White
J Black
+ White
- Red
Black
+ Yellow
- Blue
Blue
+ Red
- Blue
Black
+ Yellow
- Black
Yellow
+ Red
- White
K Yellow
+ Yellow
- Red
Red
+ Brown
- Blue
Green
+ Red
- Green
Yellow
+ Yellow
- Purple
Blue
+ Red
- White
N Orange
+ Orange
- Red
B Grey
+ Grey
- Red
Grey
+ Red
- Grey
Grey
+ Red
- White
R Green
+ Black
- Red
Green
+ White
- Blue
Black
+ Red
- White
S Green
+ Black
- Red
Green
+ White
- Blue
White
+ Red
- White
Green
+ Yellow
- Green
Black
+ Red
- White
T Blue
+ Blue
- Red
Blue
+ White
- Blue
Brown
+ Red
- Brown
Blue
+ Yellow
- Blue
Brown
+ Red
- White

 

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