Deltabar S
Endress+Hauser 27
Process isolating diaphragms
for materials with hydrogen
build-up (Gold-Rhodium
coating)
With regard to materials in which hydrogen build-up takes place, hydrogen atoms can diffuse through the
metalic process isolating diaphragms. This can result in incorrect measurement results.
Endress+Hauser offers process isolating diaphragms with Gold-Rhodium coating for this application.
ä 71 ff "Ordering information PMD75", ä 70 "Ordering information FMD77" or ä 76 "Ordering
information FMD78", feature 60 "Process isolating diaphragm material".
Operating conditions (Environment)
Ambient temperature range • PMD75, FMD77, FMD78: –40...+85°C (–40...+185°F), devices for lower temperatures on request
• PMD70, FMD76: –20...+85°C (–4...+185°F)
• On-site display: –20...+70°C (–4...+158°F)
Extended temperature application range with restrictions in optical properties such as display speed and
contrast: –40...+85°C (–40...+185°F)
• Separate housing: –40 to +60°C (–40 to +140°F)
For devices for use in hazardous areas, see Safety instructions, Installation or Control Drawing ( ä 82,
sections "Safety Instructions" and "Installation/Control Drawings").
The device can be used in this temperature range. The values of the specification, such as thermal change, may
be exceeded. See also DIN 16086.
Storage temperature range • –40...+ 90°C (–40...+194°F)
• On-site display: –40...+85°C (–40...+185°F)
• Separate housing: –40 to +60°C (–40 to +140°F)
Degree of protection • ä 67 ff, feature 30 "Housing, Cable entry, Protection".
• Degree of protection IP 68 for T17 housing: 1.83 mH
2
O for 24 h
• Seperate housing ä 25
Climate class Class 4K4H (air temperature: –20...55°C/–4...+131F, relative humidity: 4...100%) fulfilled as per
DIN EN 60721-3-4 (condensation possible)
Vibration resistance
Electromagnetic compatibility • Electromagnetic compatibility to EN 61326 and NAMUR recommendation EMC (NE21). For details refer
to the declaration of conformity.
• With enhanced immunity against electromagnetic fields as per EN 61000-4-3:
30 V/m with closed cover (for devices with T14 or T15 housing)
• Maximum deviation: < 0.5% of span
1
• All EMC measurements were performed with a turn down (TD) = 2:1.
Device/Additional option Housing Test standard Vibration resistance
PMD70/
FMD76
optional on-site display on
the side (T14)
GL guaranteed for:
2...18 Hz: ±4 mm;
18...500 Hz: 5 g in all 3 planes
PMD75 optional on-site display on
the side (T14)
IEC 61298-3 guaranteed for:
10...60 Hz: ±0.35 mm;
60...2000 Hz: 5 g in all 3 planes
PMD75 optional on-site display on
the top (T15)
with mounting bracket IEC 61298-3 guaranteed for:
10...60 Hz: ±0.15 mm;
60...500 Hz: 2 g in all 3 planes
1) Larger deviations possible with PMD70 with 25 mbar or 100 mbar sensor
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