Azbil Corporation
10
Model
KFPA
,
KFTA
- Field Mount type Pressure Indicating Controllers
2-2-4: Pneumatic signal receiver unit (set point pointer)
This unit receives with its bellows an external pneumatic signal of 20 to 100 kPa {0.2
to 1.0 kgf/cm²} and converts this pneumatic signal into a mechanical position
displacement. This displacement is conveyed via a travel link to the deviation
generating mechanism which magnifies the displacement so that the input signal is
indicated as a set point signal on the indicator scale.
2-2-5: Batch switch unit
When the output has exceeded a preset limit, a relay trips so that the reset pressure
cannot increase above the preset limit. This unit is used to prevent abnormal excursion
of signal when starting operation of a batch process. (This unit is effective only for
control of high limit.)
Preloading for a batch process can be done by applying an external preload pressure to
the connector block (RES port) of the instrument.
Figure 10
Figure 11
Connected to link
Control pneumatic pressure
Reset unit
Atmosphere
(or 20 to 100 kPa
{0.2 to 1.0 kgf/cm
2
}
preload pressure)
