Technical Data
CompareContinuous / Liquids
| Measuring Principle | Differential pressure |
| Characteristic / Application | Digital transmitter with metallic measuring diaphragms one side with diaphragm seal Modular transmitter Long term stability Enhanced safety via self diagnostic functions Secondary process barrier |
| Supply / Communication | 4...20 mA HART: 10,5...45V DC Ex ia: 10,5...30V DC PROFIBUS PA / FOUNDATION Fieldbus: 9...32V DC |
| Accuracy | 0,075% + influence of diaphragm seal |
| Long term stability | 0,05% of URL/year |
| Ambient temperature | -50°C...85°C (-58°F...185°F) |
| Process temperature | -40°C...400°C (-40°F...752°F) |
| Process pressure / max. overpressure limit | 160bar (2400 psi) |
| Pressure measuring range | 100mbar...16bar (1.5psi...230 psi) |
| Main wetted parts | Alloy C276 316L Monel Tantalum |
| Process connection | Low pressure side: 1/4-18NPT RC1/4" High pressure side: Flanges (DIN, ASME, JIS) |
| Max. measurement distance | 160m (525ft) H2O |
| Communication | 4...20 mA HART PROFIBUS PA FOUNDATION Fieldbus |
| Certificates / Approvals | ATEX, FM, CSA, CSA C/US, IEC Ex, INMETRO, NEPSI, EAC |
| Safety approvals | SIL |
| Design approvals | EN10204-3.1 NACE MR0175, MR0103 |
| Options | HistoROM/M-Dat 4-line digital display SS- or Aluminiumhousing Separate housing |
| Successor | PMD78B |
| Application limits | Measuring cell: Metal welded |
Pressure
| Measuring Principle | Differential pressure |
| Characteristic | Digital transmitter with metallic measuring diaphragms, one side with diaphragm seal Modular transmitter Long-term stability Secondary process barrier enhanced saftey via self diagnostic functions |
| Supply voltage | 4...20mA HART 10,5...45V DC (Non Ex): Ex ia: 10,5...30V DC PROFIBUS PA: 9...32 V DC (Non Ex) FOUNDATION Fieldbus: 9...32 V DC (Non Ex) |
| Reference Accuracy | 0,075% + influence of diaphragm seal |
| Long term stability | 0.08 % of URL/ year 0.14 % of URL/ 5 years 0.27 % of URL/ 10 years |
| Process temperature | -40°C...400°C (-40°F...752°F) |
| Ambient temperature | -50°C...85°C (-58°F...185°F) |
| Measuring cell | 100 mbar...16 bar (40 inH20...240 psi) |
| Smallest calibratable span | 5 mbar (0.075 psi) |
| Vacuum resistance | 50 mbar (0.73 psi) |
| Max. Turn down | 100:1 |
| Max. overpressure limit | 160 bar (2400 psi) |
| Process connection | Low pressure side: 1/4-18NPT RC1/4" High pressure side: Flanges (DIN, ASME, JIS) |
| Material process membrane | 316L, AlloyC, Tantal, Gold-Rhodium, PTFE |
| Material gasket | None, diaphragm seal welded |
| Fill fluid | Silicone oil, Inert oil, Vegetable oil Low- temperature oil High- temperature oil |
| Material housing | 316L, Die-cast aluminum |
| Communication | 4...20 mA HART PROFIBUS PA FOUNDATION Fieldbus |
| Certificates / Approvals | ATEX, FM, CSA, CSA C/US, IEC Ex, INMETRO, NEPSI, EAC, UK Ex |
| Safety approvals | SIL |
| Design approvals | NACE MR0175 EN10204-3.1 |
| Specialities | Diagnostic functions |
| Successor | PMD78B |
The Deltabar FMD77 differential pressure transmitter uses a metal sensor with a single-flange diaphragm seal or double-flange seal, with a capillary on the low-pressure side. It is mainly used for the continuous level measurement in the process industry. The built-in HistoROM data module facilitates process and device parameter management. It complies with IEC 61508 and meets SIL3 functional safety requirements.
Advantages
Excellent repeatability and long-term stability
High reference accuracy: up to ±0.075%, platinum version: ±0.05%
The new TempC diaphragm minimizes the influence of ambient and process temperature changes
For flow and differential pressure monitoring to SIL3 requirements, compliant with IEC 61508, certified by TÜV SÜD
HistoROM®/M-DAT memory module
Function monitoring of measuring cell and circuitry
Modular continuous measurement of differential pressure, static pressure and pressure (Deltabar S - Deltapilot S, Cerabar S), e.g. replaceable display, universal electronics for pressure and differential pressure measurement
Areas of application
For liquid level, volume or mass measurement
Process connections: thread and flange
Temperature: -70 ... +400°C (-94 ... +752°F)
Measuring range: +100mbar ... +16bar (+1.5 ... +240psi)
Accuracy: ±0.075%
International explosion protection approval, WHG overflow protection, hygienic approval, marine approval, SIL
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Source:Endress+Hauserwebsite public information
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。
