Specifications

Transducers
110
Requests Regarding Selection
For remote measurement, select a large output value.
When performing remote measurements, as a general rule, use a local transducer and ensure that transmissions are made
according to the output side of the transducer; that is, ensure that the output side is not pulled over a long distance. Additionally,
select a large output value; for example, 4~20mA.
1
Select an H or S Series model if the load resistance varies.
When the load resistance to be connected to the output terminals of a transducer is unknown, or where there is a possibility for
future increases in load, select a constant-voltage, constant-current output transducer such as a model from the H or S series.
2
Select a model with an effective value if the input waveform becomes distorted.
AC-input transducers are calibrated based on sinusoidal input. In addition, depending on the model, error may occur when the
input waveform is distorted due to the operating principle. Therefore, if there is waveform distortion, select an effective-value model
with comparatively low error such as T-101SAA or T-101SAV.
3
Select a phase-angle transducer for unbalanced loads if the three-phase loads are unbalanced.
Phase-angle transducer errors may occur if the three-phase loads of balanced circuits become unbalanced. Select a phase-angle
transducer for unbalanced loads such as T-101HPA(U) or T-101SPA(U) if it is possible that the three-phase load will be
unbalanced.
4
Error may occur when the input current is extremely low (phase angle, power factor).
When using a phase angle or power factor transducer, error or malfunction may occur when the input current drops significantly
lower than the rated current. Therefore, when selecting the rated primary current of a CT, ensure that the secondary current during
actual use is 1/3 or more of the rated secondary current of the CT.
5
Check the electricity pulse unit (active and reactive).
Be certain to first check the restrictions applying to the value to be set for the electricity pulse unit (active and reactive) for multi-use
transducers.
6
The standard bias/span ratio of the rated values of a transducer is 1/4 or less.
Cases where the bias/span ratio is larger than 1/4 can be supported by increasing the class index by multiples of 1/4 only.
(Example 1) In the case where the output value is 4~20mA, the bias is 4mA, the span is 16 (=20-4)mA, and the bias/span ratio is
thus 4/16=1/4.
(Example 2) In the case where the output value is 12~20mA, the bias is 12mA, the span is 8 (=20-12)mA, and the bias/span ratio
is thus 12/8=3/2. This is six times the abovementioned ratio of 1/4 and is accommodated by selecting a model with
which the class index is multiplied by six; for example, if the class index is 0.25, 0.25✕6 = class 1.5.
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