Monitor differential pressure across industrial filters with a 4–20 mA DP transmitter and NORVI hardware. Turn a rising pressure drop into a clear maintenance decision for HVAC, water treatment, and dust collection systems.
A differential-pressure sensor does more than create an alarm. It gives maintenance teams a measured point for deciding when a filter is actually becoming restrictive.
Calendar replacement can discard a filter that still has useful capacity, while a long interval can leave a fast-loading filter in service too long. Pressure-drop data shifts the decision to actual condition.
Filter cost + service timingAs an air filter becomes restrictive, the fan system must operate against a higher pressure drop. Monitoring the rise gives facilities teams a condition signal before restriction becomes an avoidable operating burden.
Fan energy + airflow performanceIn water treatment, a blocked filter can affect pump operating conditions. In dust collection, rising filter resistance affects fan or blower performance. Early visibility helps maintenance respond before restriction becomes a larger process problem.
Pump / fan load + equipment wearCore value: move filter replacement from a calendar decision to a condition decision, then evaluate the business case across filter consumption, energy, and equipment operating cost.
Put a differential-pressure transmitter across the filter, scale its 4–20 mA output to pressure, and use the controller to log, compare, alert, or forward the condition.
Pressure taps are placed on the upstream and downstream sides of the element.
The transmitter converts differential pressure into a standard industrial current-loop signal.
A robust analog signal carries the measurement to the monitoring controller.
Scale the reading, trend filter loading, apply maintenance logic, and communicate the result.
Best suited to isolated filter points where running mains power or plant networking is inconvenient. Model A accepts two 4–20 mA inputs, provides 12 V sensor excitation, and combines IP67 protection with cellular telemetry and local storage.
Low-power operation: NORVI documents timed shutdown with RTC wake for scheduled readings. The EC-M12 datasheet also exposes the ADS1115 GAlert signal to the MCU, providing a hardware path for threshold-aware firmware logic.
Why NB-IoT here? For supported operator networks, NORVI positions NB-IoT as a low-power, deep-coverage option for hard-to-reach sites. That makes it relevant to basements, plant rooms, and distributed filter assets where radio conditions and battery life matter.
Best suited to AHUs, treatment skids, dust collectors, and plant rooms with 24 V power. Add the X-AI4 expansion to bring four 4–20 mA / 0–20 mA pressure channels into a modular DIN-rail controller.
Plant integration: use NORVI X when the job needs several DP channels, local control-panel integration, Ethernet / RS-485 connectivity, or expansion alongside other process I/O.
A clean filter starts with a relatively low pressure drop at its normal operating flow. As contamination builds, restriction rises. The alert point should be set from the filter or system manufacturer's allowed differential-pressure limit—not from a universal value.
The controller logic stays familiar. What changes is the differential-pressure transmitter range, process connection, materials, and where the monitoring node is installed.
Use a low-differential-pressure 4–20 mA transmitter across panel, bag, or HEPA filter stages. Trend rising restriction and send a maintenance state to facilities, BMS, SCADA, or a remote dashboard.
Use a liquid-service differential-pressure sensor with a 4–20 mA output across the treatment stage. Rising ΔP becomes a condition signal for filter servicing and pump-system review.
Measure the pressure drop across filter banks and track restriction between inspections. Use the trend to support cleaning, service scheduling, and fan or blower performance checks.
Use the current NORVI documentation for terminal assignments, supported signal ranges, power requirements, cellular options, and expansion-module details.
NORVI can help map the 4–20 mA transmitter to the right EC-M12 or NORVI X architecture for a new filter monitoring system.
Due to a surge in global demand, our production queue is at full capacity. We will not accelerate production at the expense of quality - every device undergoes full CE / EMC compliance, regardless of order volume.
| Order Quantity | Lead Time | Notes |
|---|---|---|
| Under 10 units | 2-3 wks | Standard processing |
| 10 - 100 units | 4-5 wks | Mid-volume batch |
| Above 100 units | 6+ wks | Contact us for slot |
