How are ULPA differential pressure trends recorded? Collection frequency and operating data

The ULPA filter pressure difference trend should be recorded under comparable working conditions and analyzed in combination with air volume, rotation speed and production status. A single column of pressure readings may misinterpret speed or system changes as filter dust accumulation. It is easy to record the pressure difference as 'one number per day', but the readings outside the working conditions are meaningless - fan speed increase, air volume adjustment, shutdown and restart will cause the pressure difference to change without changing the filter element itself. Aili Industry isFFU fan filter unit andIn the control scheme of the fan filter unit at the EFU equipment end , the pressure difference, air volume and rotation speed are collected synchronously, and the supportingThe FFU computer group control system can record these parameters by partition, allowing trend analysis to have a complete working condition background.

1. Calculation relationships and units: first write down the formula and pressure point clearly

The pressure difference on both sides of the filter element can be recorded as ΔP = pressure at the upstream pressure point - pressure at the downstream pressure point, in Pa. The pressure location and symbol definition should be fixed, and the trend should be analyzed under comparable air volumes.

The formula itself is simple, but if the location and symbol definition of the pressure point are different, the differential pressure readings of the same device may not match. Aili Industry isHEPA/ULPA filter .The position of the pressure point is marked in the box structure description of the The FFU computer group control system fixes symbol definitions and units when configuring parameters to avoid inconsistent calibers when recorded by different batches and different personnel. The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Determine the collection boundary: what the pressure point spans, and whether the instrument range is sufficient

Make it clear whether the pressure point only spans the filter element, and record the instrument range, unit and zero point. The replacement of the sensor or the movement of the pressure point should be marked, and the old trend cannot be continued without marking.

If the pressure point crosses the filter element and box, or crosses the pre-filter and filter element, the reading will not reflect a single object. Aili Industry isThe box design of the fan filter unit at the EFU equipment end will indicate the measurement object of the pressure point, and the instrument selection and range are determined according to the resistance range of the object. After the sensor is replaced or the pressure point is moved, the trend data cannot be directly continued, and the change should be noted in the record. To troubleshoot instrument abnormalities and data drift, please refer toFFU FAQ and technical support。

3. Choose meaningful frequencies: too dense collection does not mean that the conclusion is more reliable.

Determine the sampling or aggregation frequency based on the pollution load, change speed and project system, and retain abnormal and maintenance events. Over-density of collection does not mean that the conclusion is more reliable.

The frequency determination depends on two factors: first, the speed of dust accumulation. The resistance rises quickly in areas with large dust production, and the collection interval should be shortened accordingly. The second is management needs. For items that need to arrange spare parts in advance, the frequency should be able to support trend judgment. Aili Industry isWhen the ULPA ultra-high efficiency filter is delivered, we can cooperate with the project party to determine the initial collection frequency recommendations based on the working conditions.The FFU computer group control system supports setting the collection and summary cycle by partition to avoid data redundancy or omission caused by all points using the same frequency. The relationship between pressure difference trend and replacement cycle can be referred toULPA ultra-high efficiency filter FAQ and selection guide。

4. Correspond changes to events: an increase in pressure difference may not be a problem with the filter element

Evaluate ramp rate against pre-filter maintenance, air volume settings, shutdowns, and process adjustments. The alarm threshold should come from the model and system requirements, not just fill in the numbers randomly.

When the pressure difference rises when the fan speed increases, you should first check the changes in air volume and then determine whether the filter element needs to be replaced. Aili Industry isIn the operating data record of the FFU fan filter unit , the air volume, rotation speed and pressure difference are saved simultaneously, and the supportingThe FFU computer group control system can mark maintenance events and setting changes on the trend curve, making it easy to distinguish filter element dust accumulation from system adjustments. The impact of pre-filtration maintenance on the pressure difference trend can be referred toHEPA FAQs and Selection Guide。

5. Related questions and answers

Can the readings at different air volumes be directly compared?
Not appropriate. The resistance changes with the air volume, and the working conditions should be retained and compared according to applicable methods.

Is the increase in pressure difference necessarily due to dust accumulation in the filter element?
uncertain. Fan speed increase, air volume adjustment, pre-filtration status changes and sensor drift may affect the readings and should be investigated based on working conditions.

Is the higher the collection frequency, the better?
no. The frequency should match the dust accumulation speed and management needs. Over-density collection increases the amount of data but does not necessarily improve the quality of judgment.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

FFU computer group control system

FFU FAQ and technical support

HEPA FAQs and Selection Guide

7. Key points for selection and acceptance inspection

8. Product matching and technical support from Aili Industrial

Aili Industry isFFU fan filter unit andIn the control scheme of the fan filter unit at the EFU equipment end , the pressure difference, air volume and speed are collected synchronously, and the supportingThe FFU computer group control system can record parameters by partition, set the collection cycle and mark maintenance events.The structural description of the supporting box of the HEPA/ULPA filter indicates the location of the pressure point.ULPA ultra-high-efficiency filter delivery can be coordinated to determine the initial collection frequency recommendations.Non-standard ULPA filter projects can be configured with pressure difference monitoring points according to working conditions. Provide process objectives, installation drawings, operating conditions and acceptance requirements, and can further communicate ULPA standard specifications, non-standard interfaces, samples and batch matching. The specific parameters and test range are based on the confirmed model and technical documents.