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
Technical data
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Source:Endress+Hauserwebsite public information
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 |
Case Studies
市政污水处理污水处理厂 · 差压测量应用案例
项目背景
市政污水处理客户在污水处理厂环节，长期面临「出水水质监测精度不足、仪表易受污染导致数据漂移，影响达标排放」的困扰，对差压测量的稳定性与测量精度提出了更高要求。
解决方案
阿仪科技技术团队结合现场工况，为客户选配了适配的差压测量，并完成选型、安装、调试与整定的一站式交付。
实施效果
- 测量精度与响应速度显著提升，数据稳定可靠；
- 仪表适应市政污水处理复杂工况，维护量大幅降低；
- 助力客户实现连续在线监测与降本增效，获得客户高度认可。
食品饮料食品生产线 · 差压测量应用案例
项目背景
食品饮料客户在食品生产线环节，长期面临「卫生级测量要求高，在线仪表需耐 CIP/SIP 清洗且精度稳定」的困扰，对差压测量的稳定性与测量精度提出了更高要求。
解决方案
阿仪科技技术团队结合现场工况，为客户选配了适配的差压测量，并完成选型、安装、调试与整定的一站式交付。
实施效果
- 测量精度与响应速度显著提升，数据稳定可靠；
- 仪表适应食品饮料复杂工况，维护量大幅降低；
- 助力客户实现连续在线监测与降本增效，获得客户高度认可。
化工制药反应釜与储罐 · 差压测量应用案例
项目背景
化工制药客户在反应釜与储罐环节，长期面临「介质腐蚀性强、工况复杂，仪表需耐腐蚀且防爆」的困扰，对差压测量的稳定性与测量精度提出了更高要求。
解决方案
阿仪科技技术团队结合现场工况，为客户选配了适配的差压测量，并完成选型、安装、调试与整定的一站式交付。
实施效果
- 测量精度与响应速度显著提升，数据稳定可靠；
- 仪表适应化工制药复杂工况，维护量大幅降低；
- 助力客户实现连续在线监测与降本增效，获得客户高度认可。
电力能源电厂锅炉与汽机 · 差压测量应用案例
项目背景
电力能源客户在电厂锅炉与汽机环节，长期面临「高温高压工况下测量不稳定，维护停机成本高」的困扰，对差压测量的稳定性与测量精度提出了更高要求。
解决方案
阿仪科技技术团队结合现场工况，为客户选配了适配的差压测量，并完成选型、安装、调试与整定的一站式交付。
实施效果
- 测量精度与响应速度显著提升，数据稳定可靠；
- 仪表适应电力能源复杂工况，维护量大幅降低；
- 助力客户实现连续在线监测与降本增效，获得客户高度认可。
