RdF Corporation
T-78 // THERMOCOUPLE
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5 YEAR WARRANTY
 
OverviewPerformance Specs Ordering Specs  
Dimensional Drawing
T-78 Drawing
 
Ordering Specifications

78B
78D

Explosion Proof Rigid Thermocouple with MGO Insulated Sheath and Connection Head
Explosion Proof Spring-Loaded Thermocouple with MGO Insulated Sheath, Connection Head and Thermowell
 

  SHEATH DIAMETER (Series 78 available with 1/4" Dia. only)
      4
 
  SHEATH MATERIAL

S
I

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316 Stainless Steel
Inconel 600
 
 

ANSI TYPE THERMOCOUPLE – (Special Limits of Error)

J
K
T
E

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Iron/Constantan
Chromel/Alumel
Copper/Constantan
Chromel/Constantan
 
 

NUMBER OF JUNCTIONS

S
D

Single
Double
 

  PROBE LENGTH –
  STEM LENGTH –

78B - “L” in inches – See drawing (1/2" min.)
78D - “A” in inches - See drawing
(2" min., x + A = 24" max.)
 
 

TYPE OF JUNCTION

G
U

Grounded
Ungrounded
 
 

CONNECTION HEAD

G
H

Small Cast Aluminum (250°F max. rating)
Small Cast Aluminum (500°F max. rating)
 
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LAG HARDWARE (78D only, drawing)
– stainless steel or noted
A

BX

EX


FX		 Hex Nipple is 3/4" long standard. Specify as “A”
(Straight nipple), specify X=3", 6", 9", or 12" max.
(Aluminum union/nipple extension), specify X=min. 3" + 1" increments to 12" max.
Same as EX (stainless steel union)
 

LEAD LENGTH in Inches (4" STD.)
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78B
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_
–
4
_
_
–
S
_
_
–
J
_
_
–
S
_
_
–
6
_
_
–
U
_
_
–
H
_
_
  –  
4
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_
–

Typical write-up for 78B
78D
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_
–
4
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_
–
S
_
_
–
K
_
_
–
S
_
_
–
8
_
_
–
U
_
_
–
G
_
_
–
B3
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_
–
4
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– Typical write-up for 78D

 
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products proudly manufactured in the USA Specialists in Temperature Measurement
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