MK440 | Fixed Environmental Noise Monitor
Continuous.
Integrated. Certified.
A fixed environmental noise monitor for continuous measurement and direct 4–20 mA output to existing
control systems.
The MK440 is a fixed environmental noise monitor that continuously measures ambient/workplace noise and outputs a standard 4-20 mA signal.
It is designed for easy integration into existing control or data-logging systems (DCS / SCADA / PLC), rather than being a hand-held instrument.
Hazardous-area approved.
Features
A-weighted Output
Provides dB(A) as industry-standard 4-20 mA.
Factory-Selectable Range
Choose from bands like 24-94 dB up to 64-134 dB.
Time-Weighting
Fast or Slow (factory-set).
IP-Rated Housing
Suitable for indoor/outdoor use.
Non-incendive Approval
Safe for Class 1 Division 2 zones.
Easy Integration
Connects directly to DCS/SCADA/PLC.
Why Mines / Industrial Sites Choose It
Because it integrates directly into existing control / logging systems, allowing continuous, automatic noise monitoring without human intervention — ideal for 24/7 operations.
Its hazardous-area certification makes it safe for use in mines, processing plants, or other potentially explosive atmospheres.
Being fixed, durable, weatherproof and low-maintenance — it’s practical for long-term deployment outdoors or underground, especially around plant operations or mining equipment.
The standard output simplifies compliance reporting: noise data becomes part of overall site monitoring and control systems.
Engineering Features
A-weighted sound level output as 4–20 mA
Factory-selectable ranges (e.g., 24–94 dB to 64–134 dB)
Fast/Slow time-weighting option (factory set)
IP-rated enclosure for weather and dust protection
Approved non-incendive for Class 1 Div 2
Technical Specifications
| <strong>PARAMETER</strong> | <strong>VALUE / UNIT</strong> |
|---|---|
| Output | 4–20 mA (A-weighted) |
| Measurement Range | Factory-selectable bands |
| Time-Weighting | Fast/Slow (factory) |
| Enclosure | IP-rated |
| Certification | Non-incendive for Class 1 Div 2 |
Information
| Output Type | A weighting SPL in 4-20mA loop |
| Frequency Weighting | dB (A) |
| External Power | 12 to 24V DC |
| Cable Entry | 1/2" NPT or M20 Gland |
| Measurement Range - Selectable at Factory |
74 - 144 dB
64 - 134 dB 54 - 124 dB 44 - 114 dB 34 - 104 dB 24 - 94 dB |
| Operating Temperature | -10 to +50 °C |
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