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| Simple, low-cost installation: measurement and indication also without auxiliary power supply |
| Modular scalability: from mechanical to analogue to fieldbus |
| Universal Ex concept: Exi, Exec, Exd and Ext |
| Suitable for use in safety-related SIL2 applications |
| CFM application diagnostics for detection of float blocks and pulsation |
| Any installation position: vertical upward, horizontal, vertical downward |
| Robust measuring tube construction for high process temperatures and extreme operating pressures |
| Choice of material: stainless steel, Hastelloy®, titanium, Monel®, Inconel®, PTFE/TFM etc. |
| Many connection variants: flanged, screwed, clamped, weld-on ends etc. |
| Extended measuring span: up to 100 : 1 |
| High application safety, even with extremely low flows |
| Low Flow option down to full scale 1.5l/h/ 0.4GPH liquid or 16Nl/h/ 0.6SCFH gas |

| Measurement accuracy | Max. permissible error H250 /RR /HC /F | 1.5% of full scale range |
| 1.6% of measured value according to VDI/VDE3513-2 (qG = 50%) | ||
| Max. permissible error H250/C (ceramic, PTFE), H250H, H250U, H250 (100 : 1), H250 Low Flow |
2.0% of full scale range | |
| 2.5% of measured value according to VDI/VDE3513-2 (qG = 50% | ||
| easurement repeatability | H250 /RR /HC /F | 0.25% |
| H250H, H250U, H250 (100 : 1) | 0.50% | |
| Operating conditions | Temperature | |
| Max. operating temperature TS | -196...+300°C/ -321...+572°F Depending on the version (refer to nameplate) |
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| Higher temperatures up to +400°C/+752°F are on request. | ||
| Mechanical indicators | For detailed information on product and ambient temperatures refer to Temperatures for mechanical indicators without auxiliary power on page 11. | |
| Devices with electrical components | For detailed information on product and ambient temperatures refer to Temperatures for devices with electrical components on page 12. | |
| Pressure | ||
| Max. operating pressure PS, max. test pressure PT | Depending on the version (refer to nameplate) | |
| Min. required operating pressure | 2 times greater than pressure loss (refer to measuring ranges) | |
| Pressure tightness (vacuum) H250/C | For detailed information refer to Pressure tightness (vacuum) H250/C on page 14. | |
| Pressure/temperature for the optional heating of the measuring cone | ||
| DN15...DN50 | PS = 40barg/ 580psig, TS = 300°C/ 572°F | |
| DN80...DN100 | PS = 25barg/ 363psig, TS = 300°C/ 572°F | |
| Ingress protection | ||
| M40, M40R | IP66/68 according to EN60529, NEMA 4/4X/6 according to NEMA 250 |
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| M40R | IP69K according to DIN40050-9 | |
| Float damping during gas measurement recommended | ||
| DN15...25/ 1/2...1" | Operating pressure <0.3barg/ 4.4psig | |
| DN50...100/ 2...4" | Operating pressure <0.2barg/ 2.9psig | |
| ATEX/ IECEx/ UKEx | |
| M40 mechanical | II2GD IIC Ex h II3GD IIIC Ex h |
| M40 electrical | II2G Ex ia IIC T6 Gb II2G Ex db IIC T6 Gb II3G Ex ec IIC T6 Gc II2D Ex tb IIIC T70°C Db II2D Ex ia IIIC T85°C Db |
| FM (US/C) | |
| M40 electrical | IS Class I Div 1, Class I Zone 1 AEx ia/Ex ia XP Class I Div 1, Class I Zone 1 AEx d/Ex d NI Class I Div 2, Class I Zone 2 AEx nA/Ex nA DIP Class II / III Div 1, Class II/III Zone 21 AEx tb Certified electrical safety for ordinary location / general purpose |
| NEPSI | |
| M40 mechanical | Ex ia, Ex d, Ex ec, Ex t |
| CCOE/PESO | |
| M40 electrical | Ex ia, Ex d |
| EAC | |
| M40 mechanical | Ex c |
| M40 electrical | x ia, Ex d, Ex nA, Ex t |
| INMETRO | |
| M40 electrical | Ex ia, Ex d, Ex ec, Ex t |
| KGS | |
| M40 electrical | Ex ia, Ex d, Ex ec, Ex t |
