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The Deltabar FMD77 differential pressure transmitter with metal sensor uses a one-sided diaphragm seal or diaphragm seals on both sides with a capillary on the low pressure side.
The Deltabar FMD77 differential pressure transmitter with metal sensor uses a one-sided diaphragm seal or diaphragm seals on both sides with a capillary on the low pressure side. Typically used in the process industry for continuous level measurement in liquids. The integrated HistoROM data module makes the management of process and device parameters easy. Designed according to IEC 61508 for use in SIL3 safety applications.
| 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 | 0,05% of URL/year |
| 0,125% of URL/5 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 | 100:01:00 |
| 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, TIIS, INMETRO, NEPSI, EAC |
| Safety approvals | SIL |
| WHG/ Overfill prevention | |
| Design approvals | NACE MR0175 |
| EN10204-3.1 | |
| Specialities | Diagnostic functions |
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