Proline Promass 83E/F/O Description of Device Functions - FMC ...

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7 Block OUTPUTS Device Functions Proline Promass 83 Function description OUTPUTS CURRENT OUTPUT (1...3) CONFIGURATION Detailed explanations and information (continued) 2. Defined measuring range (m–n): m and n have different signs ➀ 20 mA 4 0 0 ➁ Q Flow a (—) outside, b (- -) within the measuring range. A0001272 ➁ Q 0 + + ➀ a b t A0001273 • STANDARD a (—): The flow components outside the scaled measuring range cannot be taken into account for signal output. A fault message is generated (# 351...354, current range) and the current output responds in accordance with the parameter settings in the function FAILSAFE MODE (4006). b (): The current output signal is proportional to the measured variable assigned. mA t A0001274 • SYMMETRY This option is not available under these circumstances, because the 0_4 mA value and the 20 mA value have different signs. • PULSATING FLOW Flow components outside the measuring range are buffered, balanced and output after a maximum delay of 60 seconds. mA A S S=A t A0001275 TIME CONSTANT (4005) Use this function to enter a time constant defining how the current output signal reacts to severely fluctuating measured variables, either very quickly (enter a low time constant) or with damping (enter a high time constant). User input: fixed-point number 0.01...100.00 s Factory setting: 1.00 s Page 70 • MN0M023 Issue/Rev. 0.2 (12/12)
Device Functions Proline Promass 83 7 Block OUTPUTS Function description OUTPUTS CURRENT OUTPUT (1...3) CONFIGURATION FAILSAFE MODE (4006) For safety reasons it is advisable to ensure that the current output assumes a predefined state in the event of a fault. The setting you select here affects only the current output. It has no effect on other outputs and the display (e.g. totalizers). Options: MIN. CURRENT The current output adopts the value of the lower signal on alarm level (as defined in the function CURRENT SPAN (4001), see page 64. MAX. CURRENT The current output adopts the value of the upper signal on alarm level (as defined in the function CURRENT SPAN (4001), see page 64. HOLD VALUE (not recommended) Measuring value output is based on the last measuring value saved before the error occurred . ACTUAL VALUE Measured value output is based on the current flow measurement. The fault is ignored . Factory setting: MIN. CURRENT Issue/Rev. 0.2 (12/12) MN0M023 • Page 71
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