DATA SHEET R-PRESSURE
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  Safety Under Pressure

RdF fail-safe pressure sealed RTD probes are the right choice for pipeline, boiler or other pressure vessel applications.

Safely contain flammable gases and
fluids up to 1500 PSI whenever a probe
or thermowell is damaged or severed.
The pressure seal protects personnel
and equipment.		  
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Temperature Range
-50°C to 260°C (-60°F to 500°F)
-50°C to 232°C (450°F) if lead wires may become wet
Sensing Element
International Grade Thin Film Platinum,
a = 0.00385 Ω/Ω/°C per IEC 751.
Ice Point Resistance
100 ± 0.12 Ω, 1000 ± 1.20 Ω
Time Constant of Model 22314
3.1 seconds nominal in water flowing at 3 ft/second
Interchangeability
±(0.3°C + 0.005|t|°C), IEC 751 Class B
Long Term Stability
Better than ±0.05°C (0.02% of resistance) per 5 years.
Better than ±0.25°C per 5 years above 200°C

Insulation Resistance
Greater than 50 megohms at 50 VDC
Excitation Current
1 mA (maximum recommended)
Pressure Rating
1500 PSI at welded header boundary
Moisture Seal
Leads sealed against shallow immersion
Vibration
Sinusoidal: 20 Hz to 2 kHz 80g
Case Material
300 Series Steel
Lead Materials
22 AWG TFE Teflon® insulated, nickel plated stranded copper.
Lengths over 3 feet are cable
22 AWG (2-wire) or 24 AWG (3-wire) FEP Teflon® insulated.
Optional armor is square loc stainless steel

Teflon® is a registered trademark of DuPont Corporation
 


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_ 22314
22421		 1/4" Dia 300 Series SST Sheathed Rigid RTD Probe Assembly, hex fitting with fail-safe pressure seal.
1/4" Dia 300 Series SST Sheathed Spring Loaded RTD Probe Assembly with fail-safe pressure seal.		 _
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_ _     RTD RESISTANCE SPECIFICATION (Ohms @ 0°C)
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T01
T10
 100 ±0.12 (a = 0.00385 Ω/Ω/°C) thin film, IEC 751
1000 ±1.2 (a = 0.00385 Ω/Ω/°C) thin film, IEC 751
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_    PROBE LENGTH - See Drawings _
 "L" _ For 22314, specify probe length in inches.
For 22421, specify thermowell insertion length “A” (bore length) in inches
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_    PROBE LAG HARDWARE - Stainless Steel (22421 only)
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A
FX		 Stainless steel hex nipple (Standard)
(Union/nipple extension), specify min. 3" plus 1" increments to 12" max.
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_     CONNECTION HEAD
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D
K
S
T		 _ Without connection head
DIN B cast aluminum (up to 200°F ambient)
Other per sales order
Transmitter (specify or supply with connection head)
(See X-2910 datasheet)
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_ _    LEAD WIRE CONFIGURATION
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A
B
X2
AX2
X3
AX3		 Single element, 2 wires 36" or under in length
Single element, 3 wires 36" or under in length
Single element, 2-wire cable over 36"
Adds stainless steel armor excluding last 5"
Single element, 3-wire cable over 36"
Adds stainless steel armor excluding last 5"
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_ _      LEADWIRE LENGTH
     ( ) Specify in inches		 _
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22421
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–
T01
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12
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F4
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–
D
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–
A
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12
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  Typical Write-up
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RdF Corporation • 23 Elm Ave., Hudson, NH 03051  
800.445.8367 • 603.882.5195 • fax 603.882.6925 • www.rdfcorp.com