• The PM421 is an optical particle sensor that uses laser scattering to detect and classify dust particles.

• The sensing modules draws in air to be sampled inside an optical chamber. The particles are counted and measured for size to determine an indication of the dust concentration in the sample.

• The PM421 has a 3 wire 4-20 mA industry standard electrical interface, making it compatible with most industry standard controllers, including the SL2010 IOC devices.

• The PM421 electronic enclosure is ingress protected to IP 65 against dust and water.

• The PM421 is fitted with two voltage test pads where the output signal can be checked with a Digital Multi-Meter (DMM) measuring DC Voltage.

Ex Protection:
Ex ia I

Physical Dimensions: 127mm x 123mm x 260mm
Weight:  ± 2.3 kg

Water and Dust: IP 65
Temperature:  -10 °C to +55 °C

Measuring Range: PM10 – 10mg/m3 PM4.0, PM2.5 on request

Analog Output Signal: 4-20 mA

Maximum Load Resistance: 800 ohm @ 24V

Test Signal: 40 mV: Zero, 200 mV: Full Scale

Electrical Protection: Test output is short circuit protected

Warm Up Time:  < 30 sec

Life Expectancy: Up to 10 years

Supply: 15 - 30VDC, (3 wire system)

Analog Output Signal: 4 mA – 0 mg/m3 , 20 mA – 10 mg/m3

Interfaces: 24VDC – (4-20mA , capable IO device)

Electrical protection:
Input power supply is reverse polarity protected.
Analogue output is short circuit protected. Test output
is short circuit protected.