The Protego DA-G Series is a compact inline detonation flame arrester designed for pipe installations up to 2″ or 3″, depending on the variant. It protects systems from stable detonations, deflagrations, and flame flashbacks using precision-stacked FLAMEFILTER® discs. It’s commonly used in gas analysis lines and other compact setups.
Compact, straight-through detonation protection
Modular FLAMEFILTER® disc replacement
Optional temperature sensors available
IIA, IIB3, IIC (NEC D, C, B)
Up to 1.1 bar abs (15.9 psi); custom builds for higher ratings
FLAMEFILTER®: Stainless Steel (standard), Hastelloy or custom on request Housing: Steel, Stainless Steel, or special alloys
Threaded per DIN ISO 228-1; flanged available on request
½″ to 2″ (up to 3″ in some configurations)
Up to 60 °C / 140 °F standard; higher options available
Basic inline design
With one integrated temperature sensor
With two integrated temperature sensors
ATEX and EN ISO 16852 compliant
DN Size
a (mm/in)
b (mm/in)
c (IIA)
c (IIB3/IIC)
d (with sensor)
G ½″
80 / 3.15″
55 / 2.17″
112 / 4.41″
135 / 5.31″
—
G ¾″
80 / 3.15″
55 / 2.17″
112 / 4.41″
135 / 5.31″
—
G 1″
100 / 3.94″
76 / 2.99″
122 / 4.80″
145 / 5.71″
—
G 1¼″
100 / 3.94″
76 / 2.99″
122 / 4.80″
145 / 5.71″
—
G 1½″
155 / 6.10″
124 / 4.88″
205 / 8.07″
205 / 8.07″
400 / 15.75″
G 2″
155 / 6.10″
124 / 4.88″
205 / 8.07″
205 / 8.07″
400 / 15.75″
Ideal for compact installations such as gas analysis lines, process sampling points, and other systems where flame flashbacks or detonation risks exist. Used widely in chemical, petrochemical, and gas processing sectors.
Suited for vapours and gases across explosion groups IIA, IIB3, and IIC. Engineered to handle both deflagrations and stable detonations within pipelines.
Stops high-velocity flame fronts from detonations
Suitable for bi-directional flow
Ultra-compact for limited space applications
Fast replacement of flame filter discs
Supports sensor-based burn-back detection in larger sizes
Temperature sensors (1 or 2)
Special materials for harsh media
High-pressure or high-temperature rated designs
Custom connection types (flanged, threaded, etc.)
Certification upgrades on request
From forging and casting to machining, assembly, and testing — every step is managed under one roof to ensure consistent quality, faster lead times, and zero compromise.
Get in touch with our team for additional information on product pricing, technical data, project support and more.
