Emerson Fisher 546NS, Инструкция по эксплуатации

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Instruction Manual
D103425X012
546NS Transducer
June 2021
13
Split Range Operation
The 546NS transducer is suitable for two‐way split range operation. In a two‐way split the milliampere (mA) or voltage
output signal of a single control device is split between two transducers electrically connected in series. Although each
transducer receives the full signal, it is calibrated to provide a full output pressure range of 0.2 to 1.0 bar (3 to 15 psig)
or 0.4 to 2.0 bar (6 to 30 psig) to the control valve with one‐half the input signal. Because the transducer operates on
only one‐half of the normal input span, the feedback bellows must be changed to compensate for the shorter span.
Change the bellows as described in the replacing feedback bellows assembly procedure in the Maintenance section.
Table 6 indicates which bellows is required for your conditions. Reset the span and zero adjustments to the split range
values. Note that these transducers cannot provide a three‐way split range.
Table 6. Feedback Bellows Output Pressure Range
OPERATION INPUT SIGNAL, DC
BELLOWS SIZE
Full Half
Bar Psig Bar Psig
Full Range
1 to 9 V
(1)
4 to 20 mA
10 to 50 mA
0.2 to 1.0 3 to 15 0.4 to 2.0 6 to 30
Split Range
4 to 12 mA or 12 to 20 mA
10 to 30 mA or 30 to 50 mA
1 to 5 VDC or 5 to 9 VDC
- - - - - - 0.2 to 1.0 3 to 15
1. Temperature compensated circuit.