Rupture Indicators - Optic Fibre Rupture Indicators | DonadonSDD

Name: Rupture Indicators - Fiber Optic Solutions | DonadonSDD
Brand: Donadon SDD
SKU: Rupture Indicators - Optic Fibre Rupture Indicators | DonadonSDD

OFI 04 / OFI 07 Fiber Optic Indicators DonadonSDD

The OFI 04 and OFI 07 fiber optic indicators are designed for electronic confirmation of rupture disc opening, without electrical or moving parts in contact with process equipment. Fiber optic terminations are mounted in the holder and connected to an amplifier. When the disc opens, light transmission between fibers is interrupted, triggering a signal to the plant safety or control system.

Technical Specifications

OFI 04: plastic optical fiber, operating temperature -55°C to +70°C / +105°C, minimum bending radius R25.
OFI 07: glass optical fiber with stainless steel protection, operating temperature -40°C to +250°C, minimum bending radius R23.
Amplifier: supply voltage 12–24 VDC, consumption 45 mA max, operating temperature -10°C to +60°C, response time 1 ms, protection IP64, housing ABS.

Compatibility and Applications

Indicators are compatible with DCD, DIF, LPD, SCD, SCR, Y90, and KRD rupture discs. They are primarily selected for low or very low pressure applications where conventional electrical, magnetic, or inductive indicators may not activate reliably due to minimal material displacement during disc opening.

ATEX and Installation

OFI indicators do not constitute an ignition source at the process interface, as only optical fibers are present. If the amplifier is installed in ATEX zones 1, 21, 2, or 22, it must be housed in a certified Ex d enclosure. Installation zone depends on the barrier: Ex ia for zones 0, 20, 1, 21, 2, 22 and Ex ib for zones 1, 21, 2, 22.

Maintenance

After disc opening, indicator replacement is not mandatory. Cleaning of protective guides and optical surfaces, and signal verification, are recommended before line reactivation.

Description

OFI

Optical rupture indicators Donadon OFI 04 and OFI 07 are very simple and reliable instruments for detecting bursting of discs.

The terminals of the optical fibres are installed in the disc holder in a suitable position and are connected to an amplifier.

Light transmission between the two optical fibres is interrupted by the bursting of the disc and a signal is sent to the plant’s safety system.

If the amplifier is in an ATEX classified zone 1, 21, 2, 22, it must be installed inside an Ex d certified box.

There are no electrical or moving parts in contact with the equipment to be controlled and therefore OFI indicators are not an ignition source.

OFI 04 and OFI 07 indicators are not damaged by the opening of the disc and therefore do not need to be replaced. Cleaning protection slides is recommended.

OFI 04 and OFI 07 indicate the opening of the disc for any maintenance or replacement.

Zone installation depends on barrier type:

Ex ia barrier -> zone 0; 20; 1; 21; 2; 22

Ex ib barrier -> zone 1; 21; 2; 22

Technical optical fibre properties

Model	OFI 04	OFI 07
Optical fibre	Plastic	Glass with steel protection
Operating temperature	From -55 to +70°C/+105°C	From -40°C to +250°C
Minimum bending radius	R25	R23

Technical amplifier properties

Model	OFI 04	OFI 07
Amplifier supply power	12-24 VDC
Amplifier consumption	45 mA max
Operating temperature	From -10°C to +60°C
Feedback time	1 msec
Degree of protection	IP64
Amplifier material	ABS
Rupture disk	DCD, DIF, LPD, SCD, SCR, Y90, KRD

Certifications

Quality certifications are a guarantee. DonadonSDD has obtained the following certifications.

DonadonSDD provides high-quality products that meet the safety requirements of the systems where they are installed. The organisation and procedures fully comply with the ISO 9001 standard to ensure the utmost quality for our products. Our quality system has also met the stringent requirements of the UNI EN 9100 standard concerning design, development, and manufacture of rupture discs for the aerospace industry.

DonadonSDD products – such as rupture discs, explosion venting panels, and rupture indicators – are certified in compliance with PED directive 2014/68/EU or ATEX directive 2014/34/EU. The rupture discs alone are manufactured, tested, and certified in compliance with ASME directive, Section VIII, Division 1 and carry the relative UD stamp.

DonadonSDD is subject to inspections carried out by 3-A Sanitary Standard, Inc. (3-A SSI) so that our rupture discs can meet the highest sanitary standards.

Upon request, our clients can ask independent inspectors to certify single batches.

DOWNLOAD CERTIFICATIONS