DATA SHEET R-22
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_
_ TYPE 22B
RIGID PROBE ASSEMBLIES
WITH HEX FITTING
1/4" diameter sheath, available in 316 stainless steel or Inconel welded to threaded hex fitting for connection head assembly. Operating ranges: –320°F to 900°F for stainless steel and up to 1200°F for Inconel. Teflon® insulated lead wires; single or dual elements; Reference or IEC/DIN R vs.
T characteristics and 2, 3 or 4 wire element configurations.		  
_ _

TYPE 22D
SPRING-LOADED PROBE ASSEMBLIES
1/4" diameter sheath, available in 316 stainless steel or Inconel; operating ranges: –320°F to 900°F for stainless steel and up to 1200°F for Inconel. RdF’s fail-safe spring-load fits all applications world-wide. Single or dual elements. Reference or IEC/DIN R vs. T characteristics and 2, 3 or 4 wire element configurations.

Thermowell must be specified for this probe. See Data Sheet T-WELLS.
_

Features
  • FM and CSA listed
  • Stainless steel fittings
  • Stainless steel or aluminum lag unions
  • TIG welded construction
  • Cast aluminum heads
  • Inconel or stainless steel sheaths
  • Single or dual elements
  • Leads per element: 2, 3, or 4
Calibrations
  • Traceable to Nist
  • R vs. T table for each RTD (at added cost)
Thermowells & Connection Heads
• 11 approved configurations (See Data Sheet T-WELLS)
Operating Temperature Range
–196°C to 480°C (–320°F to 900°F) stainless sheath
–196°C to 649°C (–320°F to 1200°F) Inconel sheath
–50°C to 480°C (–60°F to 900°F) thin films in stainless sheath
 Leadwire exit temperature: 260°C (500°F)
Element Resistance: Ohms
100.0 ± 0.1 @ 0°C (32°F)
100.0 ± 0.12 @ 0°C (32°F) Thin Film
200.0 ± 0.2 @ 0°C (32°F)
500.0 ± 0.6 @ 0°C (32°F) Thin Film
1000.0 ± 1.2 @ 0°C (32°F) Thin Film
Temperature Coefficients
0.003924 Ω/Ω/°C (reference grade), 0.003850 Ω/Ω/°C (IEC/DIN grade)

Accuracy
0.25°C @ 0°C (32°F)
0.3°C @ 0°C (32°F) on IEC/DIN thin films
Stability
Less than 0.05°C shift per year full span on wire elements,
–50°C to 300°C (–60°F to 575°F) span on thin films
Response Time of Model 22B
Less than 6 seconds in water flowing at 3 ft. per second
Vibration
Sinusoidal 20Hz to 2kHz
Wire Element: 25g standard, 50g heavy duty construction
Thin Film: 80g standard construction
Self-Heating
35 milliwatt/°F in water @ 3 ft/sec.
Recommended Current
1 mA maximum
Insulation Resistance
500 MegOhms minimum @ 100VDC @ 25°C (77°F)
Pressure Rating
3000 PSI
Lead Materials
22 AWG nickel-plated stranded copper, TFE Teflon® Insulated

Teflon® is a registered trademarks of Dupont
 

 


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
G
 Explosion proof cast aluminum
(up to 250°F ambient)
H
 Explosion proof cast aluminum
(up to 500°F ambient)
X 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
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_
–
10
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–
4
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_
–
I
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_
–
S
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_
–
6
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_
–
B
_
_
–
4
_
_
 
G
_
_
  — – Typical write-up for 22B
22D
_
_
–
11
_
_
–
4
_
_
–
S
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_
–
H
_
_
–
8
_
_
–
C
_
_
–
4
_
_
–
H
_
_
–
B3
_
_
– Typical write-up for 22D
Lag Hardware
 
RdF Corporation • 23 Elm Ave., Hudson, NH 03051  
800.445.8367 • 603.882.5195 • fax 603.882.6925 • www.rdfcorp.com