Name: Luna os4210 FBG Temperature Sensor Probe
Brand: Luna
SKU: os4210

Overview

The Luna os4210 is the sensor-probe version of the os4200 series of temperature probes. The series is built on fiber Bragg grating (FBG) technology. Each probe is a sealed stainless steel tube designed to make handling and installation easy, fast and repeatable. No epoxy holds the fiber to the tube, so long-term stability is built into the design.

In side-by-side comparisons with conventional thermocouples, the os4200 probes are equally sensitive and accurate. They also provide sub-second response time, a wider operating range and freedom from EMI noise. The os4210 is the smallest package in the series: a 1.07 x 27.1 mm probe with a 0.9 mm fiberglass braid cable. It suits installations that need flexibility and a fast response.

The sensor can be used alone or in series at the end of an FBG sensor array. Its double-ended design allows many sensors to be multiplexed on one fiber. Installation and cabling for such arrays are less expensive and less cumbersome than for comparable electronic gage networks.

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 the os4200 in its sensor templates. It uses these coefficients to calculate temperature and to record, display and transmit data for large sensor networks. The probes are designed to work with HYPERION interrogators.

Key Features

Calibrated for high absolute accuracy
Fast response time
Capable of measuring from -70 to +275 °C
Rugged sensor packages, qualified to the same standards applied to electronic gages
Double-ended design supports multiplexing of many sensors on one fiber
Included in ENLIGHT sensor templates for optical to mechanical conversions
No epoxies holding the fiber to the tube for long-term stability
Fast, simple, repeatable installation
Sensor Information Sheet with calibration coefficients supplied with each sensor

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	~10 pm/°C (±1.7 pm/°C)
Cable temperature range	-40 to 250 °C FC/APC connectors: -40 to 80 °C
Response time os4210	0.3 s Time to reach 63% of total temperature drop in water (100°C)
Accuracy, standard calibration (included)	1.0°C long term accuracy; 0.6°C short-term accuracy, typical Absolute accuracy of sensor is dependent on capability of interrogation instrument
Accuracy, premium calibration (optional)	0.5°C long term accuracy; 0.2°C short-term accuracy, typical Absolute accuracy of sensor is dependent on capability of interrogation instrument

Physical Properties

Probe (diameter x length) os4210	1.07 x 27.1 mm
Weight (including cable) os4210	1.3 g
Housing material os4210	302 Stainless Steel
Cable length	1 m (± 10 cm), each end
Fiber type	SMF28-Compatible
Cable bend radius	≥ 17 mm
Cable type os4210	0.9 mm Fiberglass Braid
FC/APC connector os4210	Optional
Fastening methods os4210	Insertion or Bond

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