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Anritsu SF Series Fine Flexible Internal Temperature Probe
Anritsu SF Series extra-fine flexible temperature probes for internal measurement in liquids, materials and confined locations.
- Temperature range: -50°C to 200°C.
- Thermocouple: Type K or Type E.
- Fine-wire length: 500, 1000, 1500 or 2000 mm.
- Response time: Approx. 2 seconds.
Anritsu SF Series Fine Flexible Internal Temperature Probe
The Anritsu SF Series is a flexible internal temperature probe made from extra-fine thermocouple wire covered with a fluororesin sheath.
Its slim and flexible construction allows the sensing wire to be positioned inside liquids, materials, narrow spaces and locations that are difficult to reach with a conventional rigid temperature probe.
The SF Series is available with Type K or Type E thermocouples and several fine-wire lengths from 500 mm to 2000 mm.
Fine Flexible Probe Construction
The SF Series uses an extra-fine thermocouple wire with a fluororesin-coated sheath. The flexible construction allows the probe to bend and follow the available measurement space.
This makes it suitable for internal measurements where a rigid stainless-steel probe would be too large, too stiff or difficult to position.
The SF probe does not use a conventional rigid handle and insertion shaft. Instead, the flexible thermocouple section itself is positioned at the required measurement point.
SF Series Specifications
| Specification | Details |
|---|---|
| Temperature Range | -50°C to 200°C |
| Thermocouple | Type K or Type E |
| Tolerance, -50°C to below -40°C | ±3.5°C |
| Tolerance, -40°C to 200°C | ±2.5°C |
| Response Time | Approx. 2 seconds |
| Fine-Wire Construction | Extra-fine thermocouple wire with fluororesin coating |
| Durability | Not rated because of the special flexible construction |
| Repair | Non-repairable |
Complete SF Series Model Table
The following model lengths are currently listed for the SF Series. Type E equivalents are also available.
| Type K Model | Type E Equivalent | Fine-Wire Length | Temperature Range |
|---|---|---|---|
| SF-K-050 | SF-E-050 | 500 mm | -50°C to 200°C |
| SF-K-100 | SF-E-100 | 1000 mm | -50°C to 200°C |
| SF-K-150 | SF-E-150 | 1500 mm | -50°C to 200°C |
| SF-K-200 | SF-E-200 | 2000 mm | -50°C to 200°C |
Fine-Wire Length
The three-digit section of the SF model number identifies the length of the extra-fine thermocouple section.
| Code | Length |
|---|---|
| 050 | 500 mm |
| 100 | 1000 mm |
| 150 | 1500 mm |
| 200 | 2000 mm |
Select the length according to the distance between the measuring instrument and the required sensing position.
Thermocouple Type
Both Type K and Type E versions are available.
| K | Type K thermocouple |
|---|---|
| E | Type E thermocouple |
The thermocouple type must match the input type of the connected thermometer or temperature indicator.
Connector Options
The SF Series can be supplied with different terminations according to the instrument being used.
| Code | Connection |
|---|---|
| ANP | Miniature thermocouple plug |
| ASP | Anritsu standard plug |
| W | Without plug / wire termination |
SF Series Model Configuration
A complete SF model can be written in the following format:
SF-K-100-ANP
| Model Section | Meaning |
|---|---|
| SF | Fine Flexible Probe Series |
| K | Type K thermocouple |
| 100 | 1000 mm fine-wire length |
| ANP | Miniature thermocouple plug |
Internal Temperature Measurement
The SF Series is intended for internal temperature measurement where the sensing element needs to be placed inside the material or measurement space.
Because the sensing section is flexible, it can be positioned around obstacles or routed through narrow openings that would not accept a rigid insertion probe.
The flexible wire should be handled carefully and should not be pulled, crushed or repeatedly bent sharply at the same point.
Response Time
The SF Series has a published response time of approximately 2 seconds.
Anritsu defines probe response time as the time required to detect approximately 99% of the true value under its specified boiling-water or boiling-steam test conditions.
Temperature Tolerance
| Measured Temperature | Published Tolerance |
|---|---|
| -50°C to below -40°C | ±3.5°C |
| -40°C to 200°C | ±2.5°C |
Typical Applications
- Internal temperature measurement
- Liquid temperature measurement
- Laboratory testing
- Narrow spaces and confined locations
- Temperature measurement inside equipment
- Temperature profiling
- Research and development
- Flexible routing around equipment or test samples
- Locations unsuitable for rigid insertion probes
SF Series vs Conventional Rigid Probe
| Requirement | SF Series | Rigid Probe |
|---|---|---|
| Flexible routing | Suitable | Limited |
| Narrow access | Suitable | Depends on probe diameter |
| Mechanical strength | Lower | Higher |
| Fixed insertion geometry | Not required | Common |
| Maximum SF operating temperature | 200°C | Depends on probe model |
Selecting the Correct SF Probe
Confirm the following before selecting the model:
- Required measurement temperature range
- Required fine-wire length
- Type K or Type E thermocouple
- Measurement location and available access
- Temperature instrument being used
- Required connector type
For a 500 mm sensing length select code 050; for 1000 mm select 100; for 1500 mm select 150; and for 2000 mm select 200.
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