Probe construction
Stem
Material: 316 stainless steel (non-magnetic)1
| | Wall thickness | Maximum length |
| 1/4 in stem | 0.028 in ±0.003 in | 28 in2 |
| 1/8 in stem | 0.010 in ±0.001 in | 20 in |
1Not suitable for direct immersion in liquid oxygen or hydrogen environments.
2Lengths may be possible depending on the overall configuration. Please contact Lake Shore to discuss.
Internal components
Internal atmosphere: Air
Internal atmosphere pressure: 98 kPa (14.2 psia)
Internal sensor wire: Quad-Twist™ 4-lead 36 AWG phosphor bronze wire with polyimide insulation
Maximum rated temperature: 378 K
Probe mount
Swagelok® fittings
| | 1/4 in probe | 1/8 in probe |
| Swagelok® part number: | SS-400-1-4BT | SS-200-1-2BT |
| Material | 316 stainless steel |
| Thread | 0.25 in NPT male | 0.125 in NPT male |
| A | 1.59 in | 1.5 in |
| B | 0.25 in | 0.125 in |
CF flange
Material: 304L stainless steel
Flange size: 11⁄3 in (DN16)
Vacuum rating: 1 × 10-13 Torr (<1.3 × 10-13 mbar)*
*Requires the use of appropriate bolts, gasket, and mating surface.
Connectors
BNC connector
Standard male BNC connector. When ordering with 4-lead wire, two separate BNC connectors will be provided to maintain the 4-lead measurement.
Configuration:
| | BNC 1 | BNC 2 |
| | Center pin | Shield | Center pin | Shield |
| 2-lead cable | I/V+ (anode) | I/V- (cathode) | — | — |
| 4-lead cable | I+ | I- | V+ | V- |
10-pin Detoronics® connector
The Detoronics connector is o-ring sealed to the temperature probe.
Note: This connector is mounted directly to the probe, meaning that no external cable can be selected with this option. It also eliminates the CF flange probe mount option.
DT02H—flange mount connectors (MIL-STD-3112H type)
General specifications
Air leakage: 1 × 10-6 cm3/s at 15 psi
Insulation resistance: 5,000 MΩ at 500 VDC
Operating temperature: -55 °C
to +125 °C (-67 °F to +257 °F)
Finish is tin-plated shell and pins
Materials
Shell, bayonet, and flange: Carbon steel
Pins: 52 nickel alloy
Insulator: Glass
25-pin D-sub connector
 | The 25-pin D-sub is required to connect directly to particular Lake Shore temperature monitors. |
Supported instruments: |
6-pin DIN connector
 | The 6-pin DIN is required to connect directly to particular Lake Shore temperature controllers and monitors. |
Supported current instruments: - Model 350
- Model 336
- Model 335
- Model 224
| Supported discontinued instruments: - Model 340
- Model 331/332
- Model 330 (diodes only)
- Model 321 (silicon diodes only)
|
Connector configurations
| Connector type | I+ | V+ | I- | V- | Shield* |
2-lead BNC
(1 connector) | Center pin | Outer cup (shield) | Not connected |
4-lead BNC
(2 connectors) | Center pin of ‘I’ BNC | Center pin of ‘V’ BNC | Outer cup of ‘I’ BNC | Outer cup of ‘V’ BNC | Not connected |
| 10-pin probe-mounted Detoronics connector® | Pin A | Pin C | Pin B | Pin D | NA |
| 6-pin DIN | Pin 5 | Pin 4 | Pin 1 | Pin 2 | Pin 6 |
| 25-pin D-sub | Pin 3 | Pin 4 | Pin 15 | Pin 16 | Pin 2 |
*Shield connection is only used in conjunction with external cable choices that include a braided shield (Cryocable™ and instrument cable)
Wire
Instrument cable
Robust 4-lead cable best for wiring to instrument where both the wire and instrument are at room temperature. The 30 AWG signal wires make these wires easier to work with than traditional cryogenic wire.
Rated temperature: -20 °C to 80 °C
Thermal conductivity (300 K): 400 W/(m·K)
Resistance (300 K): 0.32 Ω/m
Supported sensor types: Cernox® RTD, silicon diode, GaAlAs diode, platinum RTD
Cryogenic wire
Phosphor-bronze wire combinations that limit heat transfer into the temperature probe and are themselves rated for use in cryogenic environments.
| | Quad-Twist™ 36 AWG* | Quad-Twist™ 32 AWG | Quad-Lead™ 32 AWG | Duo-Twist™ 32 AWG |
| Configuration | 4-lead | 2-lead |
| Wire | Phosphor bronze |
| Gauge | 36 AWG | 32 AWG |
| Insulation | Formvar | Polyimide |
| Structure | Two twisted pairs | Four wires formed into a ribbon using Bond Coat 999 bonding film | One twisted pair |
| Thermal conductivity (300 K) | 48 W/(m·K) |
| Resistance (300 K) | 10.3 Ω/m | 4.02 Ω/m |
| Supported sensors | Cernox® RTD, silicon diode, GaAlAs diode, platinum RTD | Diodes only |
*Also used for internal probe wiring. Ordering this cable will result in a continuous length of wire from the sensor through to the outside environment.
SS (stainless steel) coaxial cable
2-lead cabling solution that is extremely robust and limits heat transfer into the probe. Due to the 2-lead configuration, this cable is only compatible with diode sensors and will cause a predictable (potentially insignificant) offset in any temperature readings.
Electrical properties
Resistance—center conductor at 295 K (22 °C): 23.62 Ω/m (7.2 Ω/ft)
Resistance—shield at 295 K (22 °C): 3.61 Ω/m (1.1 Ω/ft)
Insulation temperature range: 10 mK to 473 K
Supported sensor types: Silicon diode, GaAlAs diode
Cryocable™
A robust, 4-wire cable for use in cryogenic environments to room temperature for the ultimate in thermal isolation from external heat sources. This cable is designed around 32 AWG (203 µm) diameter superconductive wires consisting of a
NbTi core (128 µm diameter) and a Cu-10% Ni jacket. The wire is LTS, requiring very low temperatures for it to become superconducting
Minimum bend radius: 15 mm (0.6 in)
Superconducting critical temperature: 9.8 K
Superconducting critical magnetic field: 10 T
Supported sensor types: Cernox® RTD, silicon diode,
GaAlAs diode, platinum RTD
| Magnetic field | Critical current (per wire) |
| 3 T | 35 A |
| 5 T | 25 A |
| 7 T | 15 A |
| 9 T | 6 A |
| | Temperature (K) |
| 295 | 77 | 4.2 |
| Wire resistance (Ω/m) | 9.2 | 8.4 | 0* |
| Overbraid resistance (Ω/m) | 0.90 | 0.64 | 0.62 |
Thermal conductivity—entire cable assembly (W/(m·K)) | 7.6 | 2.8 | 0.17 |
*Superconducting
Wire configurations
| Wire type | I+ | V+ | I- | V- | Shield |
| Instrument cable | Black | Yellow | Red | Blue | Copper braid |
| Quad-Twist™ 36 AWG | Green (from red/green pair) | Green (from clear/green pair) | Red | Clear | None |
| Quad-Twist™ 32 AWG | Red | Black | Green | Clear | None |
| Quad-Lead™ 32 AWG | Clear | Black | Red | Green | None |
| Duo-Twist™ 32 AWG | Clear | Green | None |
| Stainless steel coaxial | Center conductor | Shield | None |
| Cryocable™ | Black | Yellow | White | Green | Stainless steel braid |
Temperature sensors
See individual sensor pages for specifications:
Cernox
DT-670
Platinum
| Sensor type | Installed sensor package |
| Cernox® | SD |
| DT-670 | SD |
| Platinum | Standard PT-100 Series packages |
All temperature sensor calibrations are performed before the device is installed into the probe. At this time, Lake Shore does not perform recalibrations on finished probes.