Direct comparison
Cleanroom Particle Counters: Portable vs Remote
Compare portable vs. remote cleanroom particle counters: ISO 14644 use cases, flow rates, calibration, cost, and which fits your monitoring plan.
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Side-by-side comparison
| Dimension | Portable (Handheld) | Remote (Networked) |
|---|---|---|
| What it is | A handheld or cart-mounted counter carried room to room to take discrete (grab) samples at defined test locations. | A fixed sensor wired into a centralized environmental monitoring system (EMS) that samples continuously from one point. |
| Primary use case | Periodic ISO 14644-1 classification and requalification testing, troubleshooting, spot checks after HVAC or equipment changes. | Continuous real-time monitoring of one fixed critical location, e.g. a fill line or Grade A/B zone, between classification events. |
| Sampling pattern | Operator carries the unit to each of the room's defined sample locations and records a discrete reading at each. | Sample tubing runs from a fixed point to the sensor 24/7; software logs a continuous, time-stamped trend. |
| Typical flow rate | Most units sample at 1 CFM / 28.3 L/min, the rate ISO 14644-1 classification methodology is built around; smaller 0.1 CFM units exist for tight spaces. | Often 0.1-1 CFM per point, split across multiple simultaneous sensors feeding one controller. |
| Standards it supports | ISO 14644-1 classification testing; feeds an ISO 14644-2 periodic monitoring plan. | ISO 14644-2 continuous monitoring; EU GMP Annex 1 continuous Grade A/B requirements; USP <797>/<800> continuous monitoring in high-risk compounding areas. |
| Calibration | ISO 21501-4 calibration certificate, typically annual, with size and flow-rate verification — the unit is easy to pull for service since it isn’t installed. | Same ISO 21501-4 requirement, but recalibrating an in-place sensor is harder to schedule around production and may require planned downtime. |
| Data / audit trail | Data is typically downloaded per session; adequate where a continuous 21 CFR Part 11 audit trail isn’t mandated. | Built for continuous electronic record-keeping; the EMS software is usually the validated layer for 21 CFR Part 11, not the sensor alone. |
| Upfront cost & install complexity | Lower upfront cost; no installation, walk-in ready. | Higher upfront cost: tubing runs, isokinetic probes, controller/software licensing, and IQ/OQ validation of the full installed system. |
| Mobility | Goes wherever testing is needed; one unit can qualify multiple rooms. | Fixed to one location; monitoring an additional point means adding another sensor. |
| Best fit | Facilities running periodic (biannual/annual) ISO classification, multi-room QC teams, smaller compounding pharmacies. | Aseptic fill lines, Grade A/B pharmaceutical manufacturing, any process needing continuous, alarm-triggering particle trending. |
Common questions
FAQ
How often does a cleanroom need particle counting?+
ISO 14644-2 sets maximum intervals between classification tests, commonly cited as 6 months for ISO Class 5 and cleaner and 12 months for ISO Class 6-9 — but always confirm the interval against your facility’s own qualified monitoring plan rather than assuming the general figure applies.
What particle sizes does a cleanroom particle counter measure?+
Most counters report 0.3, 0.5, 1.0, and 5.0 micron channels; the tightest ISO classes (Class 1-4) require 0.1 and 0.2 micron channels as well. Match the channel set to the ISO class you’re actually testing to.
Do I need isokinetic sampling probes?+
Yes, in unidirectional (laminar) airflow areas — the probe intake velocity has to match the room’s airflow velocity or the count will be skewed. They’re generally not required in non-unidirectional (turbulent) flow rooms.
Can one particle counter do both classification and continuous monitoring?+
Generally no. Portable units aren’t built for unattended 24/7 fixed sampling, and remote/networked systems aren’t built to be walked room to room — most regulated facilities own both equipment categories for different parts of their monitoring program.
Going deeper
