Description
Delavan 421 Level Transmitter Cap Analog 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 the 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 independently of the analog circuit. The Cap Analog 421 is supplied with two 15 turns, 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.