choice stringclasses 5
values | picked stringlengths 26 71 | why stringlengths 119 211 |
|---|---|---|
Model register | Zero entries; all integrity logic is deterministic thresholds and rules | The failure modes are physical and protocol-level, so no learned model is needed, no weights are held and no license question arises |
Hardware class | Flameproof enclosure discipline | The junction boxes sit in the classified area, so the enclosure class is chosen against the zone at each exact position, not by part number |
Hardware class | Area classification as the gating document | The zone, gas group and temperature class are read from the operator's current classification drawing before any hardware is specified, and the position list is countersigned |
Hardware class | Reading an Ex certification marking | The Eex'n' marking is a Zone 2 restricted-breathing class, so a Zone 1 position would force a different, heavier enclosure and must be caught before ordering |
Hardware class | Equipment protection levels drive the purchase | Protection levels, not catalog convenience, decide the explosion proof junction boxes, 24VDC power supplies, breakers and M20 Exd glands |
Sensing | radar tank gauges on all 13 tanks | These are the field devices whose readings must arrive continuous, undistorted and unswapped; the design improves their signal path without modifying them |
Sensing | 24VDC field power supplies | They power the boosters and the loop electronics, and their health is a named failure mode with its own degraded status |
Sensing | 3-core 2.5 sq.mm CU/PVC/SWA/PVC loop cabling | The loop cabling is the medium the distortion travels in, so its schedule is recorded in the as-built against each loop |
Sensing | Modbus RTU loop polling via the boosters | The polling cycle is the pace of truth for every check, and the boosters are what make the three loops readable end to end |
Pattern | System of Context, primary | The central inventory picture is an ontology projection over the gauging host, never a shadow copy, so there is one place where tank truth lives |
Ground | The operator's own site application server, on-premises | The two containers run inside the operational technology boundary on the operator's own hardware, consistent with the Pakistani Cloud First posture, so nothing about tank truth depends on a link leaving the site |
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