IPES IR3 Flame Detector
Operating Manual
Page 31 of 37
Appendix A: IPES-IR3 Explosion Protection Means
Enclosure of Current Carrying Parts
The casing includes spigot joints with controlled gaps to meet explosion‐proof
requirements for installation in Class I, Division I, Group B, C and D, and T4 locations.
The high mechanical strength of the case is able to withstand high explosive pressures
without rupture or failures of mechanical parts. The case design is in accordance with
FM 3600 and FM 3615.
Manufacturing Control Of Casing
Important parameters include:
●
Maximum width and minimum length of spigot joints
●
Surface roughness of the joined parts
●
The number of complete intact threads at the conduit entry point
The ignition temperature of the surrounding environment is limited by the outside
surface temperature of the housing, which does not exceed 275°F (135°C).
Securing of Bolts, Joints and
Grounding
Spring washers, lock washers, and lock nuts maintain the integrity of the bolted
connections by preventing loosening of the bolts.
Anti‐seize lubricant is applied on the critical joints.
Casing Ingress Protection
The design of the casing is protection class IP 66 in accordance with IEC 60529‐004.
Sealing Cables at Conduit Entry
Use approved hazardous location sealed conduit fittings. For outdoor installations,
ensure sealing meets IP66 requirements.
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