The FIW series is a family of fiber-optic gyro inclinometers for continuous well-trajectory measurement: three-axis fiber gyro plus three-axis accelerometers with dead-reckoning solve inclination, azimuth and toolface in real time — immune to magnetic interference, which makes it the instrument for cased holes, re-entries and magnetic-environment work. Three classes cover heavy-duty to slim-hole programs.
Product Images
Highlights
Fiber-gyro solution works inside casing and near magnetic interference where magnetic tools fail.
Surveys at up to 2 m/s — no stop-and-go station routine.
FIW-01 heavy-duty (Φ98 mm), FIW-02 smaller (Φ76 mm), FIW-13 slim-hole system (Φ56 mm, 19 kg).
Applications
Cased-hole and legacy-well re-surveys ｜ Window-orientation and directional perforation ｜ Measurement-while-drilling azimuth reference ｜ Coalbed gas hole surveying (FIW-02/13)
Field Instrument Family — North-Seeking, Well Surveying, Current
| Product | Domain | Key specification | Environment |
|---|---|---|---|
| YHZ90/360 Attitude System | Mine directional surveying | 0.3° north-finding in 120 s, laser + Bluetooth | Exib I Mb, IP67, -20…+60 °C |
| FIW Inclinometers | Well-trajectory surveying | ±0.05° inclination, 2 m/s continuous | 175 °C, 140 MPa |
| FCT-MA Current Sensors | Power current measurement | 0.1% class, DC+AC, 1 MHz | -45…+70 °C, non-contact |
Highlighted row = this model. All figures are manufacturer specifications; full tables live on each model page (linked). Family hub: /inertial-navigation-systems/
How to Choose in This Family
- Domain first. Underground mining (YHZ), oil & gas wells (FIW) or power current (FCT) — three different physics, one instrument standard.
- Common thread. All three are fiber-gyro or fiber-optic based, GNSS-optional or contact-free, with digital interfaces for integration.
- Ruggedization. Mining explosion-rating, 175 °C downhole heat or non-contact HV insulation — matched to the environment that demands it.
Where this model sits: FIW Inclinometers is 175 °C, 140 MPa.
Full Specifications
| Parameter | FIW-01 | FIW-02 | FIW-13 |
|---|---|---|---|
| Inclination range | 0-180° | 0-180° | 0-180° |
| Inclination accuracy | ±0.05° | ±0.1° | ±0.1° |
| Azimuth accuracy | ±0.5° (tilt ≥3°) | ±1.0° (tilt ≥3°) | ±1.5° (tilt ≥3°) |
| Toolface accuracy | ±0.3° | ±0.5° | ±1.0° |
| Operating temperature | -25 to +175 °C | -25 to +175 °C | -30 to +125 °C |
| Max pressure | 140 MPa | 140 MPa | 140 MPa |
| Probe / outer diameter | Φ63 / Φ98 mm | Φ43 / Φ76 mm | Φ43 / Φ56 mm |
| Length | 2,560 mm | 2,800 mm | 1,920 mm |
| Weight | 67 kg | 40 kg | 19 kg |
| Hole diameter | 110-246 mm | ≥90 mm | ≥70 mm |
| Power | AC220V ±10% | AC220V ±10% | AC220V ±10% |
| Interfaces | RS232 / RS422 / CAN | RS232 / RS422 / CAN | (per system config) |
| Survey speed | up to 2 m/s | up to 2 m/s | up to 2 m/s |
All figures are manufacturer specifications — full datasheet on request.
Ordering & Delivery — What to Know Before You Buy
MOQ, lead time, payment terms, customization scope and export-licensing documentation are confirmed per quotation — send your mission profile, target quantity and destination port with the RFQ. Standard flow below:
RFQ → engineering proposal with mission math → production and factory testing → licensed export via major Chinese ports with end-user documentation. Training and spare-parts programs available.
Compliance & Licensed Export
Not subject to US ITAR — this product is exported from China under applicable regulations with valid export licenses, the same compliance posture across every Benelabo product line.
- Licensed export with end-user documentation on every shipment
- Buyers screened as part of every quotation; an export compliance statement accompanies each quotation
- Government and agency products are supplied only to authorized organizations
- Every published figure on this page is labeled manufacturer-spec or bench-tested
FAQ
Why fiber gyro instead of magnetic inclinometry?
Magnetic tools lose azimuth inside casing or near interference; the FIW fiber-gyro solution is immune and north-seeking on its own (manufacturer specification).
Which class for slim holes?
FIW-13 runs in holes from Φ70 mm — the slimmest of the series at Φ56 mm outer diameter.