IAS-NC900-HI Custom nuclear air purification cart: two units in final assembly

What the IAS-NC900-HI Custom is built for

Fixed ventilation cannot follow the work. During maintenance outages, decommissioning and fuel-handling jobs, the dusty or contaminated zone is wherever the crew is this week — so the filtration has to come to them. A purification cart puts nuclear-grade air cleaning on casters: HEPA filtration for particulates and an impregnated-carbon adsorber stage for radioiodine, in one mobile housing that plugs into site power.

The 900 CFM class is the mid-size of this line: 1,500 m³/h is enough for a single work zone or a small containment, and the cart format means it can be repositioned as the job moves, instead of re-ducting a fixed system. The “Custom” in the name is literal — this pair was configured to the ordering facility’s specification, including the monitoring package below.

The front panel, explained

Differential pressure gauge （压差计）. The round dial reads the pressure drop across the filter stages. As the HEPA and adsorber load up, the reading climbs — operators can see change-out coming at a glance instead of guessing from a calendar. On this order, a digital differential-pressure meter backs the dial up: it raises an alarm when the pressure drop exceeds twice the clean-filter value — an over-threshold alarm above 400 Pa — so a loaded filter announces itself instead of waiting to be noticed.

Variable-frequency drive （变频器·调速）. The digital controller trims fan speed, so airflow can be matched to the zone: full rate during cutting or grinding, turned down for quiet standby. That saves filter life and power versus a fixed-speed fan.

Simple, gloved-hand controls. Power, run, start and stop are large physical buttons — no touchscreen menus to fight through in PPE. A heavy-duty industrial plug and locking casters complete a unit designed to be moved, plugged in and running in minutes.

The smart package on this order

Remote start. The cart can be started remotely, so the crew does not need to enter the controlled area just to switch the unit on.

Radiation probes, before and after the filter. Gamma probes sit upstream and downstream of the filter stage. If the gamma dose rate passes 250 µSv/h, the unit raises an over-threshold alarm; readings are stored, so the dose history of a job can be reviewed afterwards instead of living in a logbook. Comparing the two probes also shows the filter stage doing its work.

Digital differential-pressure alarm. Alongside the panel dial, the digital meter watches filter loading continuously and alarms when the pressure drop passes 400 Pa — roughly twice the clean-filter differential — the standard signal that a change-out is due.

Two units, one production run

The two carts photographed here were assembled together as a matched pair for one facility order. Building in pairs keeps the configuration identical — same drives, same gauges, same filter set — which simplifies the site’s spares and maintenance. Carts are built to order; airflow class, filter configuration, voltage and plug standard are confirmed against the site specification before production.

Need to size a cart for your own work zone? Start with the room volume and the air changes per hour your task needs — our air cart sizing guide walks through the arithmetic, and the free sizing calculator does it for you.