Paper Machine Pressure Monitoring Applications

Date: 2024-Feb-29



The paper industry is a fundamental raw material industry. The paper machine is the core equipment in the pulping and papermaking process. Smart pressure transmitters promote the automation of pulping and papermaking. Smart pressure transmitters measure pressure, differential pressure, flow, level, and other specifications to enhance production capacity and reduce operating costs. 


(The production site of a paper-making customer of Micro Sensor)

Paper machine is the general term for production equipment. Paper machine is the general name of production equipment, including main machines and auxiliary systems. The main machines is the headbox, wet web section, press section, dryer section, calender, reel, and drive section. Auxiliary system involves the recovery of steam, water, vacuum, lubrication, and heat.

Although paper machines have various structural forms, they generally consist of components such as stock preparation, forming, pressing, drying, surface treatment, winding, and transmission, along with associated auxiliary systems.

Paper Machine Applications

· Pulper Level Measurement

The pulper is used in the pulping process. It mixes pulp with water to disperse the fibers in the water and form a uniform slurry. The processed slurry can be supplied to subsequent papermaking equipment. The liquid level measurement can ensure that the slurry can accurately enter the headbox for processing.

Measurement taskLevel measurement
Measuring positionTank
Measuring range0.1bar
MediumFiber water mixture
Process temperature20~50°C
Process pressure0~0.1bar
Special challenge

High temperature and high humidity measurement environment

· Headbox Level Measurement

Pump helps paper suspension into the headbox. Through the pressurized headbox, the liquid passes through cross-flow distributors and manifolds. It reaches the screen through the rectangular discharge opening or slices. The outflow speed of the suspension is controlled by adjusting the pressure of the pump. It matches the speed of the screen. Accurate pressure measurement and minimization of the turbulence created in the headbox are crucial for this part of the process.

Measurement taskPressure measurement
Measuring positionPipeline
Measuring range0.1bar
MediumPaper stock suspension
Process temperature20~50°C
Process pressure0~0.1bar
Special challengeLow range measurement

·Drying Barrel Differential Pressure Measurement

The remaining moisture in the paper web is removed by steam and heated rollers in the dryer section. The drying process removes steam heat. A thin layer of condensation will form on the inner wall of the drum. The layer affects the transfer of heat to the paper and must be continuously skimmed off by siphoning. Inlet and outlet pressure measurements control the correct heat level transfer.

Measurement taskPressure measurement
Measuring positionDrying cylinder
Measuring range0.5bar
Process temperature90~150°C
Process pressure2~3 bar
Special challengeHigh temperature & high humidity measuring environment

· Steam Pipeline Pressure Measurement

The drying section of the paper machine requires water vapor. It is used to heat the drying cylinders for drying the paper web. The steam is typically generated in the company's power plant. It is delivered through insulated pipelines. Orifice plates with built-in differential pressure transmitters determine the flow rate to ensure optimal consumption and demand planning.  

Measurement taskPressure measurement
Measuring positionPipeline
Measuring range16 bar
Process temperature100~210°C
Process pressure6~16 bar
Special challengeHigh temperature & high pressure measuring environment

· Vacuum Pump Pressure and Level Measurement

The vacuum pump is used for dewatering on high-speed paper machines. The required high vacuum is from single-stage or multi-stage centrifugal blowers. The speed of the electric drive regulated vacuum intensity. Continuous measurement of the vacuum level is necessary for this purpose. Monitoring of the bearing lubrication system ensures reliable operation of the vacuum blower. This requires measuring the pressure in the lubrication lines and the level in the lubrication oil supply tank.

Measurement taskLevel and pressure measurement
Measuring positionVacuum pump
Measuring range-0.75bar
MediumLubricating oil, air
Process temperature30~90°C
Process pressure-0.75~0 bar
Special challengeHigh vacuum, high vibration

· Auxiliary Tank Level Measurement

The cleaning of press rolls is in product changes or machine shutdowns in the paper machine. Then, press rolls is treated with a special coating. This helps protect them from adhesions and deposits. The mixed coating agent with hot water is pumped to various positions in the machine. The measurement of reservoir level is necessary to maintain automated operation.

Measurement taskLevel measurement
Measuring positionAuxiliary tank
Measuring range0~0.5bar
MediumPulping auxiliary
Process temperature20~50°C
Process pressure0~0.1bar
Special challengeLarge temperature changes, low level

Anti-Clogging Solutions in the Paper Industry

In pulp and paper making, pulp tends to form flocculation. It easily causes clogging and hardening. Therefore, flange-type smart pressure transmitters are suitable for level and pressure measurement of pulp. It is recommended to use single-flange diaphragm seals or remote diaphragm seals according to the installation position and equipment conditions. Different media measurements will have different configurations.

pressure transmitters for process industry

Recommended Products

In paper machines, Micro Sensor offers a range of smart measuring instruments, such as smart pressure transmitters, level transmitters, temperature transmitters, flowmeters, etc., tailored to specific application conditions. These instruments enable the recording, monitoring, and control of process parameters at various monitoring and control points throughout the production process.

MDM7000-DP Smart Differential Pressure Transmitter

MDM7000-DP Smart Differential Pressure Transmitter• Range: 0.06bar~30bar;

• Accuracy: ±0.05%, ±0.075% URL

• Operating temperature: -40℃~85℃;

• Output: 4mA~20mA DC+HART;

• Certificates: PCEC, ATEX, IECEx, CSA, CE, RoHS, CCS, HART;

MDM7000-AP Smart Pressure Transmitter


• Range: 0.4bar~100bar;

• Accuracy: ±0.075%, ±0.1%, ±0.2% URL

• Operating temperature: -40℃~85℃;

• Output: 4mA~20mA DC+HART;

• Certificates: PCEC, ATEX, IECEx, CSA, CE, RoHS, CCS, HART;

MDM7000-LP Smart Differential Pressure Transmitter With Remote Diaphragm Seals


• Range: 0.4bar~30bar;

• Accuracy: ±0.05%, ±0.075% URL + Diaphragm seal system effects

• Operating temperature: -10℃~70℃;

• Output: 4mA~20mA DC+HART; 4mA~20mA DC+HART (intrinsically safe);

• Certificates: PCEC, ATEX, IECEx, CSA, CE, RoHS, CCS, HART;

MDM7000-LT Smart Differential Pressure Level Transmitter


• Range: 0.4bar~30bar;

• Accuracy: ±0.05%, ±0.075% URL + Diaphragm seal system effects;

• Operating temperature: -10℃~70℃;

• Output: 4mA~20mA DC+HART; 4mA~20mA DC+HART (intrinsically safe);

• Certificates: PCEC, ATEX, IECEx, CSA, RoHS, CE, CCS, HART;

MTM4831 Temperature Transmitter

MTM4831 Temperature Transmitter

• Range: -200°C~0°C~500°C;

• Accuracy: ±1.0%FS (-200°C...0°C~500°C);

±0.5°C(-40°C...0°C~150°C );

±0.25°C(-20°C...0°C~105°C )

• Operating temperature: -25℃ ~70℃;

• Output: 4mA~20mA DC; 4mA~20mADC+HART; 4mA~20mADC+RS485; RS485; thermal resistance;

• Certificates: Flameproof, intrinsically safe, CCS

MFE600E Electromagnetic Flowmeter 

MFE600E Electromagnetic Flowmeter

• Range: Diameter DN25~DN200;

• Accuracy: ±0.2%FS; ±0.5%FS;

• Operating temperature: -40℃~60℃;

• Output: 4mA~20mA DC; Hart; frequency, pulse; RS485 (ModBus protocol) RS232 output;

• Certificates: TS, CNEX, CE, CCS.


Smart transmitters monitor flow, pressure, temperature in the papermaking process. The system can be adjusted and optimized in real time through the collection and analysis of these data. It also monitors and optimizes the energy consumption. This meets sustainable development goals. Owning to data collection and control functions, operators realize the remote operations and adjustments. This increases the flexibility of the production process. Faster response to production parameters is also accomplished.


Previous posts: Electromagnetic Flowmeter in Modernizing Irrigation District Water Diversion Projects

Next chapter: MPM4511A Series Pressure Transmitters for Engineering Machinery

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Micro Sensor GmbH
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