RdF Corporation
T-78 // THERMOCOUPLE
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Overview of RdF Temperature Sensor Applications
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CSA FM APPROVED
5 YEAR WARRANTY
 
Overview Performance Specs Ordering Specs   
  Performance Specifications

Features
• FM listed
• ANSI types J, T, K, E; Traceable to NIST
• Special Limits of Error
• Single or dual junctions
• Stainless steel fittings
• Inconel or stainless steel sheaths
• TIG welded construction
• Strong and flexible stranded 20 AWG
• leads, fiberglass insulated and
• jacketed cable
• 500°F Lead exit rating
• Stainless steel or aluminum lag unions
• Cast aluminum heads with up to
• 8 terminal posts

Thermowells & Connection Heads See Data Sheet T-WELLS for
representative approved configurations.

Response Time of Model 78B
(in water flowing at 3 ft/sec)
Ungrounded: < 5 seconds
Grounded: < 2.5 seconds

Approvals
RdF assemblies are approved for
Class I Div. 1 Groups B, C, D;
Class II Div. 1 Groups E, F, G;
and Class III Hazardous locations.
 
The thermocouple wires are welded directly to the sheath end closure and are completely protected. Recommended for fast responding 78B direct immersion probes. Isolated instrumentation required.

The thermocouple junction is electrically insulated from the external sheath with compacted magnesium oxide powder. Recommended in all applications to minimize instrumentation ground loops.

 
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THERMOCOUPLE MATERIAL RANGE AND LIMITS OF ERROR*
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ANSI
Type		 Positive Negative
(red color)		 Positive
(color code)		 Temperature Range
°F (°C)
 Standard
(whichever is greater)		 Special
(whichever is greater)
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J Iron
(magnetic)		 Constantan White 32 to 1330 (720) ±4°F or ±0.75%
±2°F or ±0.4%
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K Chromel Alumel
(magnetic)		 Yellow –320 to 32
32 to 2100 (1150)		 ±4°F or ±2%
±4°F or ±0.75%
±2°F or ±0.4%
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T Copper
(copper color)		 Constantan Blue –320 to 32
32 to 700 (370)
 ±1.8°F or ±1.5%
±1.8°F or ±0.75%

±0.9°F or ±0.4%
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E Chromel Constantan
(silver color)		 Purple –320 to 32
32 to 1510 (820)
 ±3°F or ±1%
±3°F or ±0.5%

±1.8°F or ±0.4%
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       *Limits of error are new material interchangeability only
   
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products proudly manufactured in the USA Specialists in Temperature Measurement
1 : 2 : 3
 
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