We recently received an enquiry from a hospital facilities team managing a small isolation ward — three adjoining rooms, three separate standalone pressure monitors, and no single view of all three at once. When an auditor asked to see the pressure history across the whole ward during a specific shift, the team had to pull logs from three different devices and manually cross-reference the timestamps. Nobody had done anything wrong, but the setup itself was the problem.
Root Cause: Single-Room Monitors Don’t Talk to Each Other
A standalone room pressure monitor does its one job well, but it has no awareness of the room next to it. If pressure relationships between adjacent rooms matter — which they usually do in isolation and cleanroom applications — nobody notices a developing problem until it shows up as a compliance finding or, worse, an actual contamination event. On top of that, in facilities running frequent vaporized hydrogen peroxide or chlorine dioxide decon cycles, standard-grade electronics degrade faster than the room finishes around them, so panels start failing on a shorter cycle than the rest of the building.
Practical Installation & Spec Considerations
If you’re consolidating multiple rooms onto a Setra FLEX, a few things to confirm before ordering:
- Confirm wall depth at each mounting location. The FLEX needs a triple-gang, double-deep electrical box (RACO 697, Appleton M3-350, or equivalent); if any of your walls are shallower than 50mm, you’ll need the remote/external transducer option rather than the on-board sensor.
- Decide FLEX-RM vs. FLEX-RC at spec stage, not after installation. The RM variant is monitoring only; the RC variant adds PI-loop or BACnet setpoint control. If there’s any chance you’ll want active control down the line, spec the RC now — it’s a different board configuration, not a field-upgradable option.
- Check chemical exposure against the housing rating. The unit’s exposed surfaces are rated for VHP, formaldehyde, chlorine dioxide, and quaternary ammonium compounds among others — worth confirming your specific decon protocol’s chemical list against this before assuming compatibility.
- Plan the BACnet integration early with your BMS contractor. Native BACnet/IP and BACnet MS/TP support removes the need for a translation gateway, but your BMS integrator will still need the point list in advance to avoid a change-order later in the project.
Before You Call Us
If you’re consolidating an existing multi-room setup or specifying a new one, send us a rough sketch of the rooms involved (how many, adjacent or not, and whether you’ll need active control or just monitoring) and we can help confirm whether one FLEX unit covers your layout or whether you’ll need more than one — no pressure either way.
