Technical data RMS621
60 Endress+Hauser
10 Technical data
10.0.1 Input
Measured variable Current, PFM, pulse, temperature
Input signal Flow, differential pressure, pressure, temperature, density
Measuring range
Number:
• 2 x 0/4 to 20 mA/PFM/pulse (in basic unit)
2 x Pt100/500/1000 (in basic unit)
Maximum number:
• 10 (depending on the number and type of extension cards)
Galvanic isolation The inputs are galvanically isolated between the individual extension cards and the basic unit (see
also 'Galvanic isolation' under Output.
Measured variable Input
Current • 0/4 to 20 mA +10% overreach
• Max. input current 150 mA
• Input impedance < 10 Ω
• Accuracy 0.1% of full scale value
• Temperature drift 0.04% / K (1.8 °F) ambient temperature
• Signal damping low filter 1st order, filter constant adjustable 0 to 99 s
• Resolution 13 bit
• Fault recognition 3.6 mA or 21 mA limit as per NAMUR NE43
PFM • Frequency range 0.01 Hz to 12.5 kHz (18 kHz intrinsically safe version)
• Signal level 2 to 7 mA low; 13 to 19 mA high
• Measurement method: period length/frequency measurement
• Accuracy 0.01% of measured value
• Temperature drift 0.1% / 10 K (18 °F) ambient temperature
Pulse • Frequency range 0.01 Hz to 12.5 kHz (18 kHz intrinsically safe version)
• Signal level 2 to 7 mA low; 13 to 19 mA high with approx. 1.3 kΩ dropping resistor at
max. 24 V voltage level
Temperature Resistance thermometer (RTD) as per ITS 90:
Identifier Measuring range Accuracy (4-wire
connection)
Pt100 -200 to 800 °C
(-328 to 1472 °F)
0.03% of full scale value
Pt500 -200 to 250 °C
(-328 to 482 °F)
0.1% of full scale value
Pt1000 -200 to 250 °C
(-328 to 482 °F)
0.08% of full scale value
• Type of connection: 3-wire or 4-wire system
• Measuring current 500 µA
• Resolution 16 Bit
• Temperature drift 0.01% / 10 K (18 °F) ambient temperature
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