Out of stockYokogawaPressure Sensors & Transmitters
API · ASME · ISO · NIST · UKAS
1 / 6Metal-sensor differential pressure transmitter with flush diaphragm seal for level and DP measurement; 500 mbar cell, 4-20 mA HART, up to SIL3, ATEX Ex db, IP66/IP67.
The Endress+Hauser Deltabar S FMD77 is a differential pressure transmitter built for continuous measurement of level, volume, mass, differential pressure and flow in demanding process applications. It belongs to the Deltabar S family and uses a metal process-isolating diaphragm; the FMD77 variant carries one flush diaphragm seal mounted directly on the process flange (high-pressure side), while the low-pressure side is a direct connection or a capillary. This decouples the electronics from the process and makes the device well suited to level in open and closed vessels, especially with hot or viscous media.
The measuring principle is a metal process-isolating diaphragm filled with oil that transfers the pressure to a resistance bridge (semiconductor technology); the change in bridge output voltage is proportional to the differential pressure. The patented TempC membrane minimizes errors caused by process and ambient temperature swings, and the HistoROM/M-DAT data module allows fast electronics replacement and parameter cloning.
The unit held by Barmaan (tag L23) carries the 500 mbar measuring cell (nominal span -500 to +500 mbar; nameplate DP -5000...5000 mmH2O), 4-20 mA with superimposed HART protocol, and 316L wetted diaphragm with FKM seal. Reference accuracy is up to +/-0.075% of the set span (excluding diaphragm-seal error), turn down up to 100:1, nominal pressure PN 160 with overpressure limit up to 160 bar one-sided and 240 bar both-sided.
Deltabar S is designed up to SIL 3 per IEC 61508 (certified by TUV SUD) for safety-instrumented flow and DP monitoring. This device carries an ATEX flameproof approval (Ex db IIC, KEMA 04 ATEX 2018) and IP66/IP67 ingress protection, making it suitable for oil and gas, petrochemical, chemical, power and water/wastewater plants.
All figures on this page are taken from the official Endress+Hauser Technical Information TI00382P; the device nameplate is the final reference. Contact the Barmaan commercial team for a proforma invoice, stock status and technical advice.
| Attribute | Value |
|---|---|
| General | |
| Measuring principle | Metal process-isolating diaphragm; oil-filled, resistance bridge (semiconductor technology) |
| Model / order code | Deltabar S FMD77; order code FMD77-2WX80/139; ext. order code FMD77-5BC7FF1DRABA+MB71Z1 |
| Measuring cell (this unit) | 500 mbar (7.5 psi); ΔP -5000...5000 mmH2O per nameplate; span 0.05/5 mH2O |
| Performance & accuracy | |
| Smallest calibratable span (FMD77) | 5 mbar (0.075 psi) |
| Turn down | up to 100:1 (higher on request) |
| Reference accuracy | up to +/-0.075 % of set span (FMD77, excl. diaphragm-seal error) |
| Long-term stability (500 mbar cell) | +/-0.025 % of URL per year |
| Process conditions & connection | |
| Nominal pressure / overpressure limit | PN 160 (16 MPa / 2400 psi); OPL 160 bar one-sided, 240 bar both-sided |
| Nameplate MWP / calibrated range | MWP 504 mH2O; Cal./Adj. 400...3650 mmH2O |
| Ambient temperature | -40 to +85 °C (without LCD); -20 to +70 °C (with LCD display) |
| Storage temperature | -40 to +90 °C (-40 to +194 °F) |
| Process connection | Flanged diaphragm seal (FMD77); EN 1092-1 / ASME B16.5 flanges (this unit approx. DN80 / 3in Class 300) |
| Construction & materials | |
| Process temperature (at diaphragm seal) | -70 to +400 °C (-94 to +752 °F), depends on fill fluid |
| Wetted materials / fill fluid | Process-isolating diaphragm AISI 316L (1.4435); options Alloy C276/Monel/Tantalum/Au-Rh; fill fluid silicone oil (nameplate Mat. 316L, seal FKM) |
| Ingress protection | IP66 / IP67 (per nameplate) |
| Power & output | |
| Output signal | 4...20 mA with superimposed HART protocol, 2-wire |
| Supply voltage | 11.5...45 V DC (non-Ex, per nameplate); Ex ia 10.5...30 V DC |
| Display / data module | optional 4-line LCD; HistoROM/M-DAT data module |
| Approvals & safety | |
| Functional safety | up to SIL 3 per IEC 61508, certified by TUV SUD (SIL 2 in single/redundant use) |
| Hazardous-area approval | ATEX II 2 G Ex db IIC T6..T1 Gb (KEMA 04 ATEX 2018); also IECEx, FM, CSA, NEPSI |
| Model code | Description | Measuring range |
|---|---|---|
| FMD77 | Deltabar S FMD77 (one diaphragm seal)★ Selected model. One flush diaphragm seal on the high-pressure side, direct or capillary on the low-pressure side; ideal for level in open/closed vessels with hot or viscous media. | 100 mbar ... 40 bar (nominal cells) |
| FMD78 | Deltabar S FMD78 (two diaphragm seals)Diaphragm seals on both sides connected via capillaries; for closed vessels and true differential-pressure level where both taps need remote seals. | 100 mbar ... 40 bar (nominal cells) |
| PMD75 | Deltabar S PMD75 (dual process connection)Classic differential-pressure transmitter with both process connections on the meter body (no seal); highest accuracy up to +/-0.035% and smallest span 1 mbar. Family also includes PMD70 and FMD76. | 10 mbar ... 40 bar (nominal cells) |
All listed models can be supplied with your required certification, output protocol and process connection — contact us or request a quote for exact model-code selection.
Per the nameplate it uses the 500 mbar measuring cell with a nominal differential-pressure range of -5000 to +5000 mmH2O (approx. -500 to +500 mbar). It is calibrated/adjusted to 400...3650 mmH2O and can be re-ranged within the cell limits (smallest calibratable span 5 mbar, turn down up to 100:1).
Yes. The Deltabar S family is designed up to SIL 3 per IEC 61508 and certified by TUV SUD, with continuous function monitoring from the measuring cell to the electronics. This particular device also carries an ATEX flameproof approval (Ex db IIC) and IP66/IP67 protection.
This is the specific unit in Barmaan stock (tag L23, Deltabar S FMD77, order code FMD77-2WX80/139, 500 mbar / 4-20 mA HART, 316L/FKM). Contact the Barmaan commercial team for a proforma invoice, current availability, lead time and technical selection support; matching the measuring cell, seal fill fluid and flange to your process is recommended before purchase.
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