DATA SHEET R-23
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These environmentally protected Industrial Platinum RTDs are sealed in stainless steel. They outperform more costly traditional RTD assemblies over the –50°C to +260°C (–60°F to 500°F) temperature range. The construction assures time response twice as fast as traditional designs. The leadwire is stranded nickel plated copper with TFE Teflon® insulation. These all purpose probes are especially suitable for wet applications because the leadwire and sensor seal withstand immersion. 23A can be cut or bent to fit any application. Connection head covers are gasketed for NEMA 4 dust and moisture resistance.		  
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Temperature Range
–50°C to 260°C (–60°F to 500°F),
to 232°C (450°F) if leadwire may become wet.

Sensing Element
Thin film platinum International grade,
a = 0.00385 Ω/Ω/°C per IEC 751
Thin film platinum industrial grade,
a = 0.00375 Ω/Ω/°C

Ice Point Resistance
100 ± 0.12Ω or 1000 ± 1.2Ω

Time Constant of 23A and 23B
3.1 seconds in water at 3 ft/second

Self-Heating
Greater than 35mW/°C

Interchangeability
±(0.3°C @ 0°C + 0.005 |t|°C) IEC 751 Class B

Long Term Stability
Better than 0.05°C (0.02% of resistance) per 5 years.
0.25°C/5 years above 200°C (400°F)

Insulation Resistance
Greater than 50 Megohms
at 50VDC at 25°C

Recommended Current
1 mA maximum for temperature sensing

Pressure Rating
3000 PSI

Moisture Seal
Leads sealed for shallow immersion

Vibration
Sinusoidal: 20 Hz to 2 kHz, 80g

Case Material
300 series stainless steel

Lead Materials
#22 AWG TFE Teflon® insulated
nickel plated stranded copper wire.

Teflon® is a registered trademark
of the DuPont Corporation.
 

Type 23A
Straight Probe Assembly

Type 23B
Rigid Probe Assembly with Hex Fitting
 23A  1/4" Dia. straight probe, 316 stainless steel
 23B_ 1/4" Dia. probe with rigid 1/2 - 14 NPT stainless hex fitting
  RTD RESISTANCE SPECIFICATIONS (Ohms @ 0°C)
  T01 100 ± 0.12 (a = 0.00385 Ω/Ω/°C) thin film, IEC751
  T10 1000 ± 1.2 (a = 0.00385 Ω/Ω/°C) thin film, IEC751
  H10 1000 ± 1.2 (a = 0.00375 Ω/Ω/°C) thin film, Industrial
 CONNECTION HEAD – 23B Only (see table)
 PROBE LENGTH (specify “L” in inches) (see drawings)

A
B
C
X3
X4		 LEAD WIRE CONFIGURATION
Single element, 2 wires any length
Single element, 3 wires 36" or under in length
Single element, 4 wires 36" or under in length
Single element, 3 wire cable over 36"
Single element, 4 wire cable over 36"
  ARMOR LENGTH (21A only)
     Specify “X” in inches (ie. A0 = no armor,
     A60 = 60 inches) (Single element only)
 
 LEAD LENGTH (specify in inches)
 (12" standard on 23A)
 (4" standard on 23B)
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23A
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T01
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-
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8
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B
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A20
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12
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 Typical write-up for 23A
23B
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T10
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A
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8
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A
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A0
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4
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 Typical write-up for 23B

Type 23D
Spring Loaded Probe Assembly
Thermowell must be ordered seperately. See Data Sheet T-WELLS.
 23D  1/4" Dia. Spring Loaded Stainless Hex Probe Assembly
 
 RTD RESISTANCE SPECIFICATION (Ohms @ 0°C)
 T01  100 ± 0.12 (a = 0.00385 Ω/Ω/°C) thin film, IEC751
 T10  1000 ± 1.2 (a = 0.00385 Ω/Ω/°C) thin film, IEC751
 H10  1000 ± 1.2 (a = 0.00375 Ω/Ω/°C) thin film, Industrial
 
   PROBE LENGTH IN THERMOWELL
   ( “A” bore depth in inches, see drawing)
 
 PROBE LAG HARDWARE 1/2 x 1/2 NPT _
A
*
Gx

Hx

Jx


Kx		 Hex nipple is 3/4" long stainless*, specify as “A” (std)
Other stainlesss hardware, see DATA SHEET R-21
(Coupling/nipple extension), black iron,
specify x=min. 3" plus 1" increments
(Union/nipple extension), black iron,
specify x=min. 3" plus 1" increments
(Close nipple, galvanized unsealed parting coupling, nipple extension), black iron, specify X= minimum 1 1/2"
+ 1" increments (shortest “union”)
(Straight nipple), black iron, specify x= 1/8", 1/2", 1", + 1" increments (CREDIT)
 
 CONNECTION HEAD (see table below)
 
 LEAD WIRE CONFIGURATION
A
B
C
X3
X4		 Single element, 2 wires any length
Single element, 3 wires 36" or under in length
Single element, 4 wires 36" or under in length
Single element, 3 wire cable over 36"
Single element, 4 wire cable over 36"
 
 LEAD LENGTH (specify in inches) (4" std)
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23D
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T01
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6
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G3
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J
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B
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4
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_   Typical write-up for 23D

Connection Heads with Terminals
_ NEMA 4 w/gasket Conduit Max. Temp
A  Small cast aluminum head 1/2 NPT 125°C
C  Cast Iron head 3/4 NPT 260°C
D  For no connection head specify “D” - -
E  Large cast aluminum head 3/4 NPT 260°C
F  Economy conduit body 1/2 NPT 125°C
I  Hinged plastic 3/4 NPT 125°C
J  Hinged cast aluminum 3/4 NPT 125°C
K  Din B cast aluminum 1/2 NPT 100°C
S  Other (please specify when ordering) - -
T  Transmitter, specify or supply w/head - -
 
RdF Corporation • 23 Elm Ave., Hudson, NH 03051  
800.445.8367 • 603.882.5195 • fax 603.882.6925 • www.rdfcorp.com