Whether the bag filter operates stably, whether the filter bag is blocked or damaged, and whether the ash removal system functions properly, all depend on the differential pressure data on both sides of the filter bag. The differential pressure transmitter is the core monitoring instrument of the entire dust removal automatic control system. Next, with the Longlv PTL805 digital display differential pressure transmitter, we will clarify the necessity and practical application value of installing a differential pressure transmitter in bag filters.

1、 Real time monitoring of filter bag blockage degree, automatic control of pulse dust cleaning

When the bag is working, dust will adhere to the outer surface of the filter bag to form a layer of ash. The thicker the layer of ash, the higher the pressure difference between the inlet and outlet of the dust collector, and the system resistance will increase synchronously.

The differential pressure transmitter collects the pressure at both ends of the dust chamber and the clean air chamber, and outputs the real-time pressure difference value to the pulse controller PLC。 When the pressure difference reaches the preset upper limit, automatically start pulse blowing to clear the dust, blow off the accumulated dust in the bag, and let the pressure difference fall back to the normal range; After the pressure difference meets the standard, the cleaning will automatically stop, achieving on-demand cleaning and abandoning the extensive mode of fixed cycle cleaning.

The Longlv PTL805 comes with an on-site digital display, allowing operation and maintenance personnel to view real-time pressure differentials on site without the need to go back and forth to the central control for adjusting the dust removal threshold. It is suitable for long-term continuous monitoring of dust and smoke conditions.

2、 Rapid warning of abnormal pressure difference, avoiding environmental violations and equipment damage

The pressure difference value is a visual signal of dust removal equipment failure, and two abnormal states can quickly distinguish the root cause of the problem:

Continuous high pressure difference

The representative filter bag has serious dust accumulation, stuck bag, insufficient blowing pressure, and blocked blowing pipe. If not dealt with in a timely manner, the resistance of the air duct will increase, the load of the induced draft fan will soar, the power consumption will increase significantly, and in severe cases, the air volume will drop sharply, causing dust to overflow from the production station and exceeding environmental emissions standards.

Sudden significant decrease in pressure difference

Indicating that the filter bag is damaged, the bag opening seal has fallen off, the flower board is leaking air, and dust directly penetrates the bag and is discharged. Obvious smoke and dust can be seen on the chimney, resulting in environmental penalties. PTL805 can be equipped with dual alarms for high and low pressure differences. When the pressure difference exceeds the range, the switch signal triggers an audible and visual alarm, which immediately reminds the machine to stop for maintenance and avoids long-term excessive emissions.

3、 Reduce energy consumption of fans and optimize the operating cost of dust removal systems

The high resistance caused by bag blockage will continue to increase the load on the fan, resulting in a significant increase in power consumption. By relying on PTL805 pressure differential linkage for dust cleaning, the pressure differential is always maintained within the standard range, reducing the ineffective energy consumption of the fan.

Compared with the timed uninterrupted cleaning mode, pressure differential linkage cleaning can reduce the consumption of pulse valves and compressed air, extend the service life of filter bags and pulse valves, reduce spare parts replacement and air source loss, and effectively reduce workshop operation and maintenance costs during long-term operation.

4、 Anticipate equipment hazards and reduce unplanned downtime

By relying on the trend of pressure difference changes, potential faults can be predicted in advance:

The pressure difference rises slowly and steadily: the ash cleaning force is insufficient, so the injection pressure can be increased in advance to shorten the ash cleaning interval;

Rapid increase in pressure difference in a short period of time: high humidity dust sticking bags, excessive moisture content in flue gas, timely adjustment of front-end drying and insulation processes;

Unstable pressure difference fluctuating between high and low: uneven airflow distribution, high ash accumulation in the ash hopper, and early cleaning and discharge of ash.

PTL805 stably outputs a 4-20mA standard signal, and the central control system can record the pressure difference operation curve, making it convenient for operation and maintenance personnel to trace the equipment operation status, achieve preventive maintenance, and reduce sudden shutdown maintenance.

5、 Adapt to environmental online supervision and meet the requirements of factory automation control

The current industrial environmental protection equipment requires real-time uploading of operating data, and the pressure difference data output by the differential pressure transmitter is a key indicator for environmental verification. The Longlv PTL805 can seamlessly integrate with the DCS and PLC monitoring platforms in the factory area, store long-term differential pressure operation data, and respond to on-site inspections by environmental protection departments; At the same time, it can be linked to the workshop production interlock, and when the pressure difference exceeds the standard severely, it can be linked to the front-end production line to slow down or stop, thus preventing dust from exceeding the standard from the source.

6、 The exclusive advantage of Longlv PTL805 in adapting to bag dust removal conditions

Dual pressure interface, directly measuring the pressure difference on both sides of the filter bag

High and low pressure dual channel independent pressure measurement eliminates the need for two single pressure transmitters to be combined for calculation, simplifies the opening of dust removal pipelines, reduces the layout of pressure pipes, and lowers the probability of dust clogging the pressure measurement pipelines.

On site integrated digital display, convenient inspection and debugging

The dust removal workshop has a large amount of dust and a noisy environment, so there is no need to carry secondary instruments. The machine screen directly reads the pressure difference, and multiple units can be freely switched; The body buttons can be used to modify the alarm threshold and calibrate the zero point on site, and can be quickly adjusted during shutdown maintenance.

Anti dust and anti blocking structure, suitable for smoke and dust environments

The liquid receiving area is designed with dust-proof isolation to prevent fine dust from entering the sensing chamber and causing zero drift. Long term processing of dry industrial dust and slightly corrosive flue gas ensures stable measurement and is less prone to numerical jumps and false alarms.

High protection and anti vibration, suitable for harsh environments in dust removal workshops

The whole machine is sealed to prevent dust and moisture, and continuous vibration of the induced draft fan and pulse valve will not cause measurement distortion; Wide temperature compensation, suitable for high-temperature flue gas and low-temperature workshops in winter, with accurate pressure difference collection throughout the year.

Dual signal output of transmission and relay, stable automatic control linkage

One analog signal is uploaded to the central control to record data, while the other switch independently controls dust cleaning and alarm. The dual signals do not interfere with each other, ensuring reliable synchronization between automatic dust cleaning and fault alarm for dust removal.

7、 Standard installation method for bag dust removal

Connect the high pressure tapping end of PTL805 to the dust inlet chamber of the dust collector, and the low pressure end to the clean air outlet chamber. Equipped with a pressure guiding ball valve, it is convenient for online calibration and cleaning of dust in the pressure guiding pipeline in the later stage. The entire installation is simple, and both old and new dust removal equipment can be directly replaced with old-fashioned mechanical differential pressure gauges.