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Cap Analog 421

Delavan Cap Analog 421 PDF R.F. Capacitance Remote Transmitter w/LCD
  • On board 3.5 digit LCD Display

  • Two-wire transmission between electronics and probe

  • Built-in "coating tolerance"

  • Remote electronics for easy access

  • Up to two non-interacting and independently adjustable relays

  • Analog dampening for agitated vessels


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.

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.