Name: Luna os4310 Non-Metallic FBG Temperature Sensor
Brand: Luna
SKU: os4310

Overview

The os4310 is the non-metallic member of the Luna os4300 temperature sensor series. It uses fiber Bragg grating (FBG) technology housed within a sealed alumina ceramic tube that makes handling easy and installation fast and repeatable. No epoxies hold the fiber to the tube, so long-term stability is ensured by design.

In side-by-side comparisons with conventional thermocouples, the os4300 series is equally sensitive and accurate, while providing sub-second response time, a wider operating range, no calibration and no EMI noise. The sensor is qualified for use in harsh environments. The os4310 is the smallest package in the series and has the shortest specified response time of 0.7 seconds. A single-ended version extends the operating temperature range to -70 to 275 °C.

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

Key Features

Calibrated for high absolute accuracy
Fast response time of 0.7 seconds
Non-metallic alumina construction
Rugged sensor package qualified to the same standards applied to electronic gages
Double-ended design supports multiplexing of many sensors on one fiber
Single-ended version available with -70 to 275 °C operating range
No epoxies holding the fiber to the tube for long-term stability
Connector protection fittings available for harsh environments
Included in ENLIGHT sensor templates for optical to mechanical conversions

Specifications

Thermal Properties

Operating temperature range	-40 to 120°C Datasheet value; the web page prints "40 to 120 °C"
Operating temperature range (single-ended) os4310	-70 to 275C Available on the single ended os4310
Temperature sensitivity	~10pm/ºC (±1.7pm/ ºC)
Cable temperature range	-40 to 250° C (FC/APC Connectors: -40 to 80°C)
Response time os4310	0.7 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) os4310	18.8 x 3.2 x 3.2 mm
Weight (including cable) os4310	2.6g
Housing material os4310	Alumina
Cable length	1 m (± 10 cm)
Fiber type	SMF28-Compatible Printed as "Filter Type" in the datasheet
Cable bend radius	≥ 17 mm
Cable type os4310	1mm Fiberglass Braid
FC/APC connector os4310	Optional
Fastening method os4310	Bond Strain Reliefs Only

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	Standard - 1460 to 1620 nm in 4 nm intervals +/- 1nm

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

Options & Accessories

Option	Description
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
00	Single Ended Sensor — Cable 2 termination; available only for os4310
S	Standard Calibration — Calibration method
P	Premium Calibration — Calibration method