Envco – Environmental Equipment

All counters use the industry-standard 4-20 mA interface. Loop current is driven by voltages between 15 and 30 vdc. The sensors use an RS-485 serial interface for programming count and hold times, alarm level, alarm delay, and scaling for the 4-20 mA output. This programming data is retained through power off and on cycles.

Specifications
Sensitivity
R4903 0.3 μm (50%) @ 0.1 cfm (2.831 lpm) 0.32 μm (100%) @ 0.1 cfm (2.831 lpm)
R4905 0.5 μm (50%) @ 0.1 cfm (2.831 lpm) 0.75 μm (100%) @ 0.1 cfm (2.831 lpm)
R4915 0.5 μm (50%) @ 1.0 cfm (28.3 lpm) 0.75 μm (100%) @ 1.0 cfm (28.3 lpm)

Flow control Critical orifice requires at least 18” Hg vacuum (<500 mbar)
Light source Laser diode
Coincidence loss 5% at 2,000,000 particles per cubic foot
Zero count Not more than one count in 20 minutes
Inlet pressure Ambient to 0.1” Hg vacuum
Indicators Power and count alarm/calibration LEDs
Power 6 vdc (±10%) at < 250 mA (internal PCBA)
24 vdc (±10%) at < 250 mA (loop supply)
Weight 10.7 ounces (0.30 kg.)
Port sizes 1/8-inch ID inlet, 1/4-inch ID outlet
Environment:
Temperature Operating: 55 to 105°F (12 to 41°C)
Storage: –40 to 160°F (–40 to 70°C)
Humidity Operating: 20-95% relative, non-condensing
Storage: up to 98% relative, non-condensing

Ordering Information
2086895-04 MET ONE R4815/R4915, Remote Air Particle Counter
2086897-01 MET ONE R4903/R4905, Remote Air Particle Counter