Model 4800 Series Remote Airborne Particle Counters
0.3µm
minimum threshold setting at 0.1 cfm
0.1 or 1.0
cfm flow rate
Two size
channels
RS485 serial
communications
CONNECTING remote particle counters to your computer system has never been easier than with Met One’s R4800 Series of miniature particle counters. These counters, approximately the size of a stick of butter, can be mounted at many locations around the cleanroom. All you need to provide is a vacuum source and a communication line. The R4800 Series uses standard RS485 serial communications, allowing daisy-chained wiring between particle counters, up to 4000 feet. The particle counters will respond to simple ASCII command instructions including commands to START count, STOP count, REPORT count, location number, etc. The information reported includes the status of the counters along with the particle counts in two size ranges. A user-programmed alarm level can be set for high counts on the first channel. When high counts trigger an alarm, the LED on the counter flashes and an alarm signal is set at the connector. The alarm will automatically reset at the start of the next count cycle.
| Connector (DB-15 Female Connector) | |
| 1 | Ground |
| 2 | Alarm, open drain FET |
| 3 | N/C |
| 4 | N/C |
| 5 | N/C |
| 6 | RS485A |
| 7 | N/C |
| 8 | RS485B |
| 9 | Reserved |
| 10 | Reserved |
| 11 | Reserved |
| 12 | Reserved |
| 13 | Ground |
| 14 | Reserved |
| 15 | +VDC Power |
Specifications
| Minimum Threshold Setting | |
| 4803 | 0.3 µm |
| 4805 | 0.5 µm |
| 4815 | 0.5 µm |
| Flow Rate | |
| 4803/4805 | 0.1 cubic feet per minute |
| 4815 | 1.0 cubic feet per minute |
| Flow Control | critical orifice requires 18" Hg vacuum |
| Size Channels | |
| Ch 1/Ch 2 | 0.3/0.5 micron (R4803) |
| Ch 1/Ch 2 | 0.5/5.0 micron (R4805, R4815) |
| Light Source | laser diode (30,000 hours mean time between failure) |
| Coincidence Loss | 5% at 2,000,000 particles per cubic foot |
| Inlet Pressure | ambient to 0.1" Hg vacuum |
| Indicators | power and calibration/alarm LEDs |
| Power | 6 Vdc (+/-10%) at < 250 mA |
| Alarm Output | open collector FET max sink current (on) 150 mA; Max V.C. voltage (off) 30 VDC |
| Weight | 10.7 ounces (0.30 kg.) |
| Port Sizes | 1/8 inch ID inlet (0.1 cfm) |
| 1/4 inch ID inlet (1.0 cfm) | |
| 1/4 inch ID outlet (all) | |
| Environment Operating | 55 to 105°F (12 to 41°C), 20 to 95% R.H., noncondensing |
| Storage | -40 to 160°F (-40 to 70°C), up to 98% R.H., noncondensing |
Options
Switching power supply
(supports up to 16 sensors, 6 Vdc, 5 A).
Power adapter for 8 - 30Vdc
input (use one power adapter for each sensor).
Class One Monitoring/Data
Acquisition Software, PC-Based