os4330 Non-Metallic Epoxy Mount FBG Temperature Sensor

Epoxy-mount fiber Bragg grating temperature sensor housed in a sealed alumina ceramic tube, with a 4.6 s response time.

Operating Temperature Range: -40 to 120°C
Temperature Sensitivity: ~10pm/ºC (±1.7pm/ ºC)
Cable Temperature Range: -40 to 250° C (FC/APC Connectors: -40 to 80°C)
Response Time: 4.6 seconds

Datasheet

Overview

The os4330 is the epoxy-mount version of the Luna os4300 Non-Metallic Temperature Sensor series. It is based on fiber Bragg grating (FBG) technology, and the grating is housed within a sealed alumina ceramic tube designed to make handling easy and installation fast and repeatable. No epoxies hold the fiber to the tube, so long-term stability comes from the design itself.

In side-by-side comparisons with conventional thermocouples, the os4300 sensors are equally sensitive and accurate. They also offer a wider operating range, need no calibration, and pick up no EMI noise. The sensor is qualified for use in harsh environments.

The os4330 can be used alone or in series as part of an FBG sensor array, because its double-ended design allows many sensors to be multiplexed on one fiber. Each sensor ships with a Sensor Information Sheet that lists the calibration coefficients needed to convert wavelength information into temperature. The ENLIGHT Sensing Software includes a utility to calculate, record, display and transmit data for large sensor networks.

Key Features

Calibrated for high absolute accuracy
Fast response time
Non-metallic construction
Rugged sensor package, qualified to the same rigorous standards applied to electronic gages
Double-ended design supports multiplexing of many sensors on one fiber
Included in ENLIGHT's sensor templates for quick optical to mechanical conversions
Fast, simple, repeatable installation
Connector protection fittings available for harsh environments

Specifications

Thermal Properties

Operating Temperature Range	-40 to 120°C The web page prints "40 to 120 °C" (minus sign missing). This value is taken from the datasheet.
Temperature Sensitivity	~10pm/ºC (±1.7pm/ ºC)
Cable Temperature Range	-40 to 250° C (FC/APC Connectors: -40 to 80°C)
Response Time os4330	4.6 seconds Time to reach 63% of total temperature drop in water (100°C)
Standard Calibration (Included) – Long Term Accuracy	1.0°C Based on 120ºC soak for 1,000 hours; absolute accuracy depends on capability of interrogation instrument
Standard Calibration (Included) – Short-Term Accuracy	0.6°C Typical; four (4) thermal cycles from min to max temperature
Premium Calibration (Optional) – Long Term Accuracy	0.5°C Based on 120ºC soak for 1,000 hours; absolute accuracy depends on capability of interrogation instrument
Premium Calibration (Optional) – Short-Term Accuracy	0.2°C Typical; four (4) thermal cycles from min to max temperature

Physical Properties

Dimensions (L x W x H) os4330	31.8 x 7.6 x 7.6 mm
Weight (Including Cable) os4330	4.3g
Housing Material os4330	Alumina
Cable Length	1 m (± 10 cm)
Filter Type	SMF28-Compatible
Cable Bend Radius	≥ 17 mm
Cable Type os4330	1mm Fiberglass Braid
FC/APC Connector os4330	Optional
Fastening Methods os4330	Epoxy Type

Optical Properties

Peak Reflectivity (Rmax)	> 70%
FWHM (- 3 dB point)	0.25 nm (± .05 nm)
Isolation	> 15 dB @ ± 0.4 nm around center wavelength
Wavelengths (+/- 1nm)	Standard - 1460 to 1620 nm in 4 nm intervals

Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.

Applications

Process temperature monitoring
SHM for civil and geotechnical structures
SHM for energy systems
Structures (bridges, dams, tunnels, mines, buildings, oil platforms)
Energy (wind turbines, oil wells, pipelines, nuclear reactors, generators)
Transportation (railways, trains, roadways, specialty vehicles, cranes)
Marine vessels (hull, deck, cargo containers)
Aerospace (airframes, composite structures, wind tunnels, static and dynamic tests)

Included

Sensor Information Sheet with calibration coefficients
Standard calibration

Options & Accessories

Option	Description
S	Standard Calibration — Calibration method code in the ordering string; included as standard
P	Premium Calibration — Calibration method code in the ordering string; optional
UT	Unterminated — Termination type for cable 1 or cable 2
FC	FC/APC Connector — Termination type for cable 1 or cable 2
PF	FC/APC Connector with Protection Fitting — Termination type for cable 1 or cable 2