The PMX is an automated particulate/smoke monitor from EMX for ventilation systems — 99 levels of light transmission, range up to 9m, 100-microsecond detection speed. Ideal for kitchen ventilation, greenhouses, and industrial smoke ducts.
Type: Industrial Particulate Monitor
Detection Method: Relative light transmission measurement
Light Source: Green LED
Sensing Distance: Up to 30 ft (10 m)
Sensitive Area: 18 mm receiver lens diameter
Response Time:<150 µs
Switching Frequency: 6 kHz
Relative Intensity Display Range: 00–99
Sensitivity: Adjustable
Signal Level Display: Two 7-segment digits
Detection Threshold: Adjustable
Digital Output: Auto-detect PNP / NPN
Output Function: NO / NC selectable
Analog Output: 0–5V
LED Intensity: Adjustable via receiver trimmer
Data Retention: EEPROM non-volatile memory
Supply Voltage: 10–24 VDC
Operating Current: 60 mA
Operating Temperature: -20°C to +55°C
Storage Temperature: -20°C to +70°C
Housing Material: Metal alloy
Environmental Protection: IP65 (not for pressure washdown)
Available Versions: OEM board version / NEMA 4X enclosure version
Application: DCKV, ventilation systems, factory venting, commercial kitchen hoods, environmental monitoring
Manually monitoring smoke, dust, and airborne particulates in ventilation systems is time-consuming and imprecise. EMX Industries' PMX automates this process with a sensor that measures changes in light transmission to detect smoke and airborne particulates — ideal for demand-controlled ventilation.
The PMX offers 99 levels of relative light transmission for precise monitoring of smoke and particulate concentration, with a detection speed of just 100 microseconds. A PNP/NPN discrete output and a 0-5V analog output allow external systems — such as exhaust fans — to be automatically controlled based on measured values, without manual intervention.
With a range of up to 9 meters (30ft), the PMX can be deployed across a wide range of spaces. The sensor is available in two configurations: a board-only version for OEM integration, and a version with a NEMA 4X enclosure that protects the components while a high-quality window still allows precise light measurement.
The PMX stores threshold settings and calibration data in EEPROM non-volatile memory, so the sensor resumes correct operation immediately after a power interruption. With a switching frequency of 6kHz and a response time of under 150 microseconds, the sensor reacts in near real-time to changes in smoke or dust concentration. IP65 protection (not suitable for pressure washdown) shields the electronics from dust and splashing water, while the operating temperature range of -20°C to +55°C makes the PMX suitable for both indoor and outdoor installations across Europe.
Typical applications include commercial kitchen ventilation (exhaust hoods), greenhouses where ventilation of fumes and pesticides must be controlled, and industrial smokestacks or ducts where smoke density needs to be monitored. By activating ventilation only when needed, the PMX reduces energy costs and helps ensure compliance with safety regulations.
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