Name: Luna os4280 Ruggedized FBG Temperature Probe with Thermocouple Head
Brand: Luna
SKU: os4280

Overview

The os4280 is the ruggedized version of the Luna os4200 series of temperature probes, which are based on fiber Bragg grating (FBG) technology. The probe is a sealed 316 stainless steel tube fitted with an aluminum thermocouple head and armored cable, so it can be installed and handled in the same way as a conventional thermocouple. No epoxies hold the fiber to the tube, which supports long-term stability by design.

Compared with conventional thermocouples, os4200 series probes offer similar sensitivity and accuracy, a wider operating range, no calibration and freedom from EMI noise. The probes are qualified for use in harsh environments.

The sensor can be used alone or in series at the end of an FBG sensor array, which keeps installation and cabling simpler than for comparable electronic gage networks. Each sensor ships with a Sensor Information Sheet listing the calibration coefficients needed to convert wavelength to temperature, and the ENLIGHT Sensing Software includes a utility to calculate, record, display and transmit data for large sensor networks.

Key Features

Ruggedized probe with aluminum thermocouple head
Armored fiber cable
Calibrated for high absolute accuracy
Capable of measuring from -70 to +275 degrees C
Qualified to the same rigorous standards used for comparable electronic gages
Fast, simple, repeatable installation
Connector protection fittings available for harsh environments
Double-ended design supports multiplexing of many sensors on one fiber
No epoxies holding the fiber to the tube
Included in ENLIGHT's sensor templates for optical to mechanical conversions

Specifications

Thermal Properties

Operating temperature range	-40 to 120°C, -70 to 275°C available Page: Standard: -40 to 120 °C; Extended range: -70 to 275 °C
Temperature sensitivity	~10pm/ºC (±1.7pm/ ºC)
Cable temperature range	-40 to 250° C (FC/APC Connectors: -40 to 80°C)
Response time os4280	8.5 Seconds Time to reach 63% of total temperature drop in water (100°C)
Standard calibration (included), long term accuracy	1.0°C Based on 275°C soak for 1,100 hours
Standard calibration (included), short-term accuracy	0.6°C Typical
Premium calibration (optional), long term accuracy	0.5°C Absolute accuracy of sensor is dependent on capability of interrogation instrument
Premium calibration (optional), short-term accuracy	0.2°C Typical

Physical Properties

Probe (diameter x length) os4280	6.35 x 137.9 mm
Weight (including cable) os4280	411 g
Housing material os4280	316 Probe w/Aluminum Thermocouple Head
Fastening method os4280	1/4" Compression Fitting
Cable type	0.9 mm Fiberglass Braid / 3mm Armored Cable Series datasheet lists both cable types; per-model assignment not explicit in extracted table
Cable length	1 m (± 10 cm), each end
Fiber type	SMF28-Compatible
Cable bend radius	≥ 17 mm

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)

Ordering Information

Part number format	os42aa-wwww-1xx-y-zz aa = 80 for Ruggetized Probe Thermocouple Head; example: os4230-1560-1FC-S-SR

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

Options & Accessories

Option	Description
UT	Unterminated — Termination type
FC	FC/APC Connector — Termination type
PF	FC/APC Connector with Protection Fitting — Termination type
S	Standard calibration — Calibration method (included)
P	Premium calibration — Calibration method (optional)
SR	Standard Range, -40 to 120°C — Calibration range
HR	High Range, 20 to 275°C — Calibration range
ER	Extended Range, -70 to 275°C — Calibration range