SCREW-IN IMMERSION RTD PROBES
AX-SI series · G1/2, G1/4, M10×1, M8 · insertion length 50–500 mm
AX-SI SERIES
The Axiom Thermal AX-SI series screw-in RTD probes measure temperature in liquid and gaseous media, in dry and humid rooms. Threaded process connection (G1/4, G1/2, M10×1, M8), single or double element, 2/3/4-wire circuit, reliable sealing under vacuum and overpressure, optional bend protection.
Key features
- Threaded process connection: G1/4, G1/2, M10×1, M8
- Single or double element, Pt1000 or Pt100, 2/3/4-wire, IEC 60751
- Class B standard; Class A / AA optional (3/4-wire)
- Protection tube Ø5 / Ø5.4 reduced / Ø6 / Ø8, insertion length 50 … 500 mm
- Cable in PVC, silicone, PTFE or metal braiding, −50 … +400 °C
- Reliable seal for vacuum and overpressure; bend protection and shielded cable optional
Applications
Apparatus and machine building, meat processing, HVAC, industrial furnaces and heating systems, refrigeration, pipes and tanks, humid rooms, vacuum and overpressure applications.
Technical specifications
| Sensing element | Platinum RTD to DIN EN IEC 60751; single or double; Pt1000 or Pt100 |
| Circuit | 2 / 3 / 4-wire (double element: 2 / 3-wire only) |
| Tolerance class | Class B (standard); Class A, AA (3/4-wire) |
| Response time (Ø6, water 0.2 m/s) | t0.5 ≈ 2 s; t0.9 ≈ 6 s |
| Sealing | Reliable seal under vacuum and overpressure |
| Design | F fixed screw · L loose screw · R loose screw + reduced tube · T threaded tube |
| Tube diameter | Ø5 / Ø5.4 (reduced to 3.3) / Ø6 (standard) / Ø8 (M8) |
| Tube material | Stainless steel (Inconel optional) |
| Insertion length EL | 50 … 500 mm (50 mm steps, custom lengths) |
| Process connection | G1/4 / G1/2 / M10×1 / M8 thread |
| Cable length AL | 2.5 m standard (0.5 … 500 m on request) |
| Cable material and temp. range | PVC −5 … +80 °C · Silicone −50 … +180 °C · PTFE −50 … +260 °C · Metal braiding −50 … +400 °C |
Ordering codes
| Code | Description |
|---|---|
| AX-SI-F-PT1K-B-G12-100-2.5M | Fixed screw G1/2, 1 × Pt1000 3-wire, Class B, Ø6, EL 100, cable 2.5 m |
| AX-SI-L-PT1K-B-G12-100-2.5M | Loose screw G1/2, 1 × Pt1000 3-wire, Class B, Ø6, EL 100, cable 2.5 m |
| AX-SI-L-PT1K-A-G14-37-2.5M | Loose screw G1/4, 1 × Pt1000 3-wire, Class A, Ø6, EL 37, cable 2.5 m |
| AX-SI-R-PT1K-B-M10-27.5-2.5M | Reduced tube Ø5.4 to 3.3, M10×1, 1 × Pt1000 3-wire, Class B, EL 27.5 |
| AX-SI-T-PT1K-B-M8-25-2.5M | Threaded tube M8 Ø8, 1 × Pt1000 3-wire, Class B, EL 25, cable 2.5 m |
| AX-SI-L-PT1K2-B-G12-200-2.5M | Double Pt1000 3-wire, loose screw G1/2, Ø6, EL 200 |
| AX-SI-L-PT1K-W2-B-G12-50-2.5M | 1 × Pt1000 2-wire, loose screw G1/2, Ø6, EL 50 |
| AX-SI-L-PT1K-A-M10-250-2.5M | Class A, M10×1, Ø6, EL 250 (bend protection / shielded cable optional) |
OEM and private label options
| Circuit / accuracy | 2 / 3 / 4-wire, Class B, A, AA |
| Tube | Ø5, Ø5.4 reduced, Ø6, Ø8; stainless steel or Inconel |
| Length | EL 50 … 500 mm, cable 0.5 … 500 m |
| Cable | PVC, silicone, PTFE, metal braiding, shielded |
Installation and wiring
Install the probe so that the full insertion length is in the medium. Seal the thread with a suitable gasket or sealant and tighten on the hexagon only. Use a 3- or 4-wire circuit for long cables and for Class A / AA.
Specifications subject to change without notice. Full resistance tables and dimensional drawings are included in the PDF datasheet.
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