RdF R-22 // Explosion Proof Industrial RTDs: Ordering Specifications

Overview

Performance Specs

Ordering Specs

RdF explosion proof assemblies are approved
for installations in Class I Div.1 Groups B, C, D;
Class II Div. 1 Groups E, F, G; and Class III
hazardous locations. The spring-loaded or fixed
sheathed platinum RTD units suit applications
worldwide. Multiple standard options enable the
user to customize a configuration for new or
replacement applications. RdF’s superior
proprietory stainless steel spring-load
ensures fail-safe thermal contact while
preventing any sheath rotation during vibration.

Three basic styles of construction:
(1) Fixed sheath
(2) Spring-loaded sheath
(3) Spring-loaded sheath with lagging.
Detailed dimensions for thermowells
are on Data Sheet T-WELLS

22B
22D

Rigid Explosion Proof Platinum RTD Assembly with Connection Head
Spring-Loaded Explosion Proof Platinum RTD Assembly with Connection Head

RTD Resistance Specification (ohms @ O°C)

10
11
T01
20
21
T05
T10
102
112
T012

100
100
100
200
200
500
1000
100
100
100

± 0.1
± 0.1
± 0.12
± 0.2
± 0.2
± 0.6
± 1.2
± 0.1
± 0.1
± 0.12

(a = 0.003924 Ω/Ω/°C) Reference Standard
(a = 0.00385 Ω/Ω/°C) IEC/DIN Standard
(a = 0.00385 Ω/Ω/°C) Thin Film
(a = 0.003924 Ω/Ω/°C)
(a = 0.00385 Ω/Ω/°C)
(a = 0.00385 Ω/Ω/°C) Thin Film
(a = 0.00385 Ω/Ω/°C) Thin Film
(a = 0.003924 Ω/Ω/°C) Dual Element
(a = 0.00385 Ω/Ω/°C) Dual Element
(a = 0.00385 Ω/Ω/°C) Thin Film, Dual Element

4 Sheath Diameter 1/4" only

S Sheath Material – S = 316 SS (Thin Film in S only), I = Inconel

Service Parameter – Sinusoidal Vibration 20Hz to 2kHz

S
H

Standard construction (25g wire-wound, 80g thin film)
Heavy duty construction (up to 50g) (Single Wire Element Only)

Probe Length 22B – “L” in inches - see drawing
(3" min., 4" min. on heavy duty construction)
Stem Length 22D – “A” in inches -see drawing
(2" min., 3" min. on heavy duty, X + A = 24" max.)

Number of Leads

A
B
C
D
E

Single element, 2 wires
Single element, 3 wires
Single element, 4 wires
Dual element, 2 wires per element
Dual element, 3 wires per element

Lead Length in Inches (4" STD.)

Connection Head

Explosion proof cast aluminum
(up to 250°F ambient)

Explosion proof cast aluminum
(up to 500°F ambient)

Explosion proof cast aluminum (up to 250°F) order separately with transmitter (4 to 20 mA)

Lag Hardware (22D Only), 1/2 NPT, Stainless or noted.
A	Hex Nipple is 3/4" long Specify as “A” (standard)
BX	(Straight Nipple), Specify X=3", 6", 9", or 12" max.
EX	(Aluminum Union/Nipple Extension), Specify X=min. 3" + 1" increments to 12" max.
FX	Same as EX (Stainless Steel Union)


	22B

–


	10

–


	4

–


	I

–


	S

–


	6

–


	B

–


	4


	G

–

Typical write-up for 22B


	22D

–


	11

–


	4

–


	S

–


	H

–


	8

–


	C

–


	4

–


	H

–


	B3

–

Typical write-up for 22D

products proudly manufactured in the USA

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