Technical Data
CompareContinuous / Liquids
| Measuring Principle | Differential pressure |
| Characteristic / Application | Electronic differential pressure transmitter with ceramic sensor (Ceraphire) for level, volume or mass measurement in liquids. |
| Supply / Communication | 4...20 mA HART: 12...45V DC Exia: 12...30V DC |
| Accuracy | 0.075% of individual sensor, "PLATINUM" 0.05% of individual sensor |
| Long term stability | 0.05% of URL/year of individual sensor |
| Ambient temperature | –40...+80°C (–40...+176°F) |
| Process temperature | –25...+150°C (–13...+302°F) |
| Process pressure / max. overpressure limit | 60 bar (900 psi) |
| Pressure measuring range | 100mbar...40bar (1.5psi...600psi) |
| Process connection | Threads Flanges (DIN, ASME, JIS) |
| Process connection hygienic | DIN11851 DIN11864-1 Tri-Clamp DRD Varivent |
| Communication | 4...20 mA HART |
| Certificates / Approvals | ATEX, FM, CSA, CSA C/US, IEC Ex, NEPSI, INMETRO |
| Design approvals | NACE MR0175 EN10204-3.1 |
| Hygienic approvals | FDA 3A |
| Options | 4-line digital display SS- or Aluminium housing |
| Application limits | Use Software Applicator Sizing Electronic DP |
Pressure
| Measuring Principle | Differential pressure |
| Characteristic | Electronic differential pressure transmitter with ceramic sensor (Ceraphire) for level, volume or mass measurement in liquids. |
| Supply voltage | 4...20 mA HART: 12...45V DC (Non Ex) Ex ia: 12...30V DC |
| Reference Accuracy | 0.075% of individual sensor, "PLATINUM" 0.05% of individual sensor |
| Long term stability | 0.05% of URL/year of individual sensor |
| Process temperature | –25...+150°C (–13...+302°F) |
| Ambient temperature | –40...+80°C (–40...+176°F) |
| Measuring cell | 100 mbar...40 bar (1.5 psi...600 psi) |
| Vacuum resistance | 0 mbar |
| Max. Turn down | 100 : 1 |
| Max. overpressure limit | 60 bar (900 psi) |
| Process connection | Threads Flansch (DIN, ASME, JIS) |
| Process connection hygienic | DIN11851 DIN11864-1 Tri-Clamp DRD Varivent |
| Material process membrane | Ceramic 316L, AlloyC |
| Material gasket | Viton, Kalrez, EPDM, NBR, Silicone |
| Fill fluid | Silicone Oil |
| Material housing | Die-cast aluminum Stainless steel |
| Communication | 4...20 mA HART |
| Certificates / Approvals | ATEX, FM, CSA, IECEx, NEPSI, INMETRO, UK Ex |
| Design approvals | NACE MR0175, EN10204-3.1, |
| Hygienic approvals | EHEDG, 3A |
The electronic differential pressure transmitter Deltabar FMD71 is a differential pressure system consisting of two sensors and one transmitter, used for level, volume or mass measurement of liquids in pressurized tanks or distillation columns/evaporators. One sensor measures the static pressure (high pressure) and the other measures the top pressure (low pressure). Based on these two digital pressure values, the transmitter calculates the level value (electronic differential pressure). The electronic differential pressure measuring system eliminates the problems that occur with conventional differential pressure measurement.
Advantages
The dry Ceraphire measuring cell is fully resistant to vacuum, corrosion and abrasion
Eliminates conventional mechanical problems, providing higher process suitability and reliability
The new electronic differential pressure system structure and design minimize safety risks
Minimized operating costs thanks to reduced installation, maintenance and downtime and lower spare part requirements
Multivariable level measurement: based on HART communication, measures differential pressure, top pressure and sensor temperature of the same system
Continuously indicates the health of the entire system via HART diagnostics
High repeatability and long-term stability
Areas of application
For level, volume or mass measurement of liquids in pressurized tanks or distillation columns/evaporators.
Process connections: thread, flange, flush-mounted hygienic connections
Temperature: –25...+150°C (–13...+302°F), optional 350°C (662°F)
Measuring range: 100mbar...40bar (1.5...600psi)
Measurement accuracy: up to ±0.05% for a single sensor, up to ±0.07% for the system
International explosion protection and hygienic approvals
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Technical documentation
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Source:Endress+Hauserwebsite public information
Case Studies
Municipal Wastewater Treatment — Wastewater Treatment Plant · Differential Pressure Measurement Application Case
Project Background
Municipal Wastewater Treatment customers at the Wastewater Treatment Plant stage have long faced the challenge of insufficient accuracy in effluent quality monitoring and instruments prone to contamination causing data drift, affecting compliance discharge, placing higher demands on the stability and measurement accuracy of Differential Pressure Measurement.
Solution
Based on the on-site conditions, the Ainstru technical team selected suitable Differential Pressure Measurement for the customer and delivered one-stop service covering selection, installation, commissioning and tuning.
Results
- Measurement accuracy and response speed significantly improved, with stable and reliable data;
- Instruments adapt to complex Municipal Wastewater Treatment conditions, greatly reducing maintenance;
- Helping customers achieve continuous online monitoring and cost reduction, highly recognized by customers.
Food & Beverage — Food Production Line · Differential Pressure Measurement Application Case
Project Background
Food & Beverage customers at the Food Production Line stage have long faced the challenge of high hygienic measurement requirements, with inline instruments needing to withstand CIP/SIP cleaning while maintaining stable accuracy, placing higher demands on the stability and measurement accuracy of Differential Pressure Measurement.
Solution
Based on the on-site conditions, the Ainstru technical team selected suitable Differential Pressure Measurement for the customer and delivered one-stop service covering selection, installation, commissioning and tuning.
Results
- Measurement accuracy and response speed significantly improved, with stable and reliable data;
- Instruments adapt to complex Food & Beverage conditions, greatly reducing maintenance;
- Helping customers achieve continuous online monitoring and cost reduction, highly recognized by customers.
Chemical & Pharmaceutical — Reactors and Storage Tanks · Differential Pressure Measurement Application Case
Project Background
Chemical & Pharmaceutical customers at the Reactors and Storage Tanks stage have long faced the challenge of highly corrosive media and complex conditions, requiring corrosion-resistant and explosion-proof instruments, placing higher demands on the stability and measurement accuracy of Differential Pressure Measurement.
Solution
Based on the on-site conditions, the Ainstru technical team selected suitable Differential Pressure Measurement for the customer and delivered one-stop service covering selection, installation, commissioning and tuning.
Results
- Measurement accuracy and response speed significantly improved, with stable and reliable data;
- Instruments adapt to complex Chemical & Pharmaceutical conditions, greatly reducing maintenance;
- Helping customers achieve continuous online monitoring and cost reduction, highly recognized by customers.
Power & Energy — Power Plant Boiler and Turbine · Differential Pressure Measurement Application Case
Project Background
Power & Energy customers at the Power Plant Boiler and Turbine stage have long faced the challenge of unstable measurement under high temperature and pressure, with high maintenance and downtime costs, placing higher demands on the stability and measurement accuracy of Differential Pressure Measurement.
Solution
Based on the on-site conditions, the Ainstru technical team selected suitable Differential Pressure Measurement for the customer and delivered one-stop service covering selection, installation, commissioning and tuning.
Results
- Measurement accuracy and response speed significantly improved, with stable and reliable data;
- Instruments adapt to complex Power & Energy conditions, greatly reducing maintenance;
- Helping customers achieve continuous online monitoring and cost reduction, highly recognized by customers.
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Endress+Hauser