Home/Resistance Temperature Detectors (RTDs)/Terminal Head Connected RTD Assemblies

Terminal Head Connected RTD Assemblies

Table A

Figure 1	RTD Assembly without Process Fitting	Figure 4	Spring-Loaded RTD Assembly with 1/2″ NPT Pipe Nipple Extension

Figure 2	RTD Assembly with 1/2″ NPT Process Fitting	Figure 5	Spring-Loaded RTD Assembly with 1/2″ NPT Hex Fitting/Union Nipple Extension

Figure 3	Spring-Loaded RTD Assembly with 1/2″ NPT Process Fitting	Figure 6	Spring-Loaded RTD Assembly with 1/2″ NPT Nipple/Union/Nipple Extension

* For custom extension length, add desired length as suffix to basic order code. Variable lengths only available in figure 4, 5 and 6

Example: 5046, for 6″ long extension.

** Fitting/Extension shown in figures 1, 2, 3, & 5 only available in stainless steel.

– If connection head is not required, simply insert figure number as basic order code Example: 3

How to Order

Pgs. 6-8

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Page 9

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Page 10

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TW Section

Basic Order Code

Sensor Diameter

Element

Tolerance

Temp. Range

Sheath Mate

Lead Conn.

“L”
Length

Options

Order Code for

Thermowell

If required

(see Thermowell

section)

104

2AS

Table A

Table B

Table C

Table D

Table E

Table F

Table G

Table H

Table I

Type of Head	Head Material	Basic Order Code
Type of Head	Head Material	Figure 1	Figure 2	Figure 3	Figure 4	Figure 5	Figure 6
Industrial Weatherproof Screw Cover Head	Cast Aluminum	100	200	300	400	500	600
Industrial Weatherproof Screw Cover Head	316 S.S.	112	212	312	412	512	612
General Purpose Weatherproof Screw Cover Head For Flip Top Style, add suffix “F” to basic order code	Cast Aluminum	104	204	304	404	504	604
Corrosion Resistant Weatherproof Screw Cover Head For Flip Top Style, add suffix “F” to basic order code	Nylon	106	206	306	406	506	606
CSA / ATEX / FM Approved Explosion Proof Head meets NEC Class I Div I Groups B, C, D Class II Div I, Groups E, F, G NEMA 4X, 7, 9, II2G, Ex d, IIC, Gb, II2 D, Ex tb, IIIC Db, IECEx	Cast Aluminum	108	208	308	408	508	608
	316 Stainless Steel	110	210	310	410	510	610

RTD Assembly Specifications

Table B (sensor diameter)

Sensor Diameter		Order Code
1/8″	(.125″)	2
3/16″	(.188″)	3
1/4″	(.250″)STD	4
5/16″	(.312″)	5
3/8″	(.375″)	6

Table C (element)

Resistance 0°C	Material	Temperature Coefficient/Alpha (a)	Order Code
Resistance 0°C	Material	Temperature Coefficient/Alpha (a)	Single Element	Dual Element
100Ω	Platinum	.00385Ω/Ω°C	A	2A
100Ω	Platinum	.003916Ω/Ω°C	B	2B
100Ω	Platinum	.003902Ω/Ω°C	C	2C
98.129Ω (100Ωnom-)	Platinum Sama Standard RC21-4-1966	.00392Ω/Ω°C	D	2D
120Ω	Nickel	.00672Ω/Ω°C	E	2E
9.035Ω	Copper	.00427Ω/Ω°C	F	2F

Table D (tolerance)

Accuracy at 0°C		Order Code
± .12%	Class B	1
± .06%	Class A	2
± .03%	Lab Grade	3
± .02%	Lab Grade	4
± .01%	Lab Grade	5

Table E (temperature range)

Temperature Range	Order Code
-50 to +250 Deg. C -58 to +482 Deg. F	A
-50 to +400 Deg. C -58 to +752 Deg. F	B
-50 to +660 Deg. C -58 to +1220 Deg. F	C

Table F (sheath material)

Sheath Material	Order Code
316 SS	1
Alloy 600	2
Alloy C-276	3

Table G (lead connection)

2-Wire	Order Code A

3-Wire	Order Code B

4-Wire	Order Code C

Table H (length)

Specify “L” in Inches

Length Not required when Thermowell is used.

Optional Connections

(For extended lead types)

Table I (options)

Description		Order Code
Spade Lugs for #8 Screw		L
Male Plug		M
The connectors shown are for 3-wire single element assemblies. Two – 2 Pin connectors mounted in tandem will be furnished for both styles of 4-wire single element assemblies. Dual element assemblies will have the same connector arrangements except Doubled.

Female Jack		F
Watertight connector	1/2″ NPT	W1
	3/4″ NPT	W3
Watertight connector with lugs for #8 screws	1/2″ NPT	WL1
	3/4″ NPT	WL3

Optional Mounting Fittings
Description	NPT	Order Code
	1/8″	1AS
	1/4″	2AS
	3/8″	3AS
	1/2″	4AS
	3/4″	6AS
For FEP readjustable insert, replace “A” with “R” Example: 4RS

Optional Spring-Loaded Devices
Description	Order Code
Adjustable Spring	FP 275
1/2″ NPT Double threaded adjustable hex bushing	FP 240
1/2″ NPT single threaded adjustable hex bushing	SSL