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PURPOSE
Delavan’s Cap Analog 421 series is a Continuous Level Transmitter
for liquids, slurries and powder bulk solids. The 421 has the
ability to display and transmit a continuous level measurement
with optional hi or low level alarms on one sensing element.
PRINCIPLE OF OPERATION
Delavan’s Capacitance Cap Analog 421 system uses a
compact pre-amplifier mounted on the rear of the probe
assembly. The pre-amp is housed in a cast aluminum
enclosure that is weather-tight and explosion proof.
All other electronic hardware is located in the remote
NEMA 4X housing. All calibration adjustments are made
at the remote location.
The Cap Analog 421, along with its probe sensor, operates as a
capacitance sensitive system that converts changes in level to
changes in output signal. After calibration, any change in level is
recognized and converted to an analog output signal (4-20mA
or 0-10 Volts DC). The system will operate any standard
4-20mA DC or 0-10 Volts DC indicator. A digital display that
can be calibrated in engineering units is available. This display
is visible through the transparent cover of the remote amplifier.
The Cap Analog 421 system is available without relays or with
one or two relays along with the standard analog outputs. The
relay or relays can be calibrated independent of the analog circuit.
The Cap Analog 421 is supplied with two 15 turn, ZERO
and SPAN adjust potentiometers. The span control is
independent and non-interacting. In addition, a rotary switch
is provided to extend the range of the SPAN potentiometer.
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