Endress+Hauser Proline Promag 55S, Техническая информация

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Proline Promag 55S
Hauser 9
Operation in zones of severe electrical interference
The measuring device complies with the general safety requirements in accordance with EN 61010-1,
the EMC requirements of IEC/EN 61326 and NAMUR recommendation NE 21.
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Caution!
Grounding of the shield is by means of the ground terminals provided for the purpose inside the connection
housing. Keep the stripped and twisted lengths of cable shield to the terminals as short as possible.
Power consumption AC: < 45 VA at 260 V AC; < 32 VA at 110 V AC (incl. sensor)
DC: < 19 W (including sensor)
Switch-on current:
• max. 2.00 A (< 700 ms) at 20 V AC
• max. 2.28 A (< 5 ms) at 110 V AC
• max. 5.5 A (< 5 ms) at 260 V AC
Power supply failure Lasting min. 1 power cycle:
• EEPROM or HistoROM/T-DAT saves measuring system data if power supply fails
• HistoROM/S-DAT: exchangeable data storage device which stores sensor characteristic data (nominal
diameter, serial number, calibration factor, zero point etc.)
Potential equalization Standard case
Perfect measurement is only ensured when the medium and the sensor have the same electrical potential. Most
Promag sensors have a reference electrode installed as standard, which guarantees the required potential equa-
lization. This usually means that additional potential equalization measures are unnecessary.
Promag S:
• Reference electrode is standard for electrode materials 1.4435/316L, Alloy C-22, tantalum, titanium Gr. 2,
Duplex 1.4462, tungsten carbide coating (for electrodes made of 1.4435)
• Reference electrode is optional for electrode material platinum
• Reference electrode not present in measuring tubes with a natural rubber lining in conjunction with brush
electrodes
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Note!
For installation in metal pipes, it is advisable to connect the ground terminal of the transmitter housing to the
piping. Also, observe company-internal grounding guidelines.
A0004375
Potential equalization by means of the transmitter's ground terminal
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Caution!
• For sensors without reference electrodes or without metal process connections, carry out potential
equalization as per the instructions for special cases described below. These special measures are particularly
important when standard grounding practice cannot be ensured or extremely strong matching currents are
expected.
• Sensors with brush electrodes do not have a reference electrode. For this reason, ground disks must be
installed if necessary to ensure sufficient potential equalization to the fluid. This applies in particular to
isolating lined pipes which are not grounded
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