Cap Analog 4100

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Overview

Cap Analog 4100

Process engineers, instrumentation specialists, and plant operators need accurate, maintenance-free, and intrinsically safe continuous level measurement across liquids, slurries, or bulk solids. For them, the Cap Analog 4100 provides two-wire RF capacitance technology with loop-powered 4–20 mA output and a compact, explosion-proof design for easy installation and long-term reliability.

Unlike traditional transmitters that require frequent recalibration or suffer from coating buildup and dielectric drift, the Cap Analog 4100 features independent zero/span calibration, coating-rejection circuitry, and temperature-stable electronics, ensuring dependable accuracy in even the harshest process environments.

With universal probe materials, wide capacitance range selection, and loop-powered simplicity, the Cap Analog 4100 delivers high-performance level measurement for chemical, food & beverage, wastewater, and bulk-storage applications—all at a low total cost of ownership.

Omnitrols 610/710

Features

Two-Wire, Loop-Powered Design

Simplifies wiring, reduces cost, and enables easy retrofit in existing control loops.

RF Capacitance Measurement

Provides continuous, drift-free level sensing in liquids, slurries, and solids with minimal maintenance.

Explosion-Proof Housing

Certified for Class I Div 1 and Class II Div 1 hazardous areas—safe for petroleum and chemical environments.

Wide Temperature Range

Independent Zero, Span, and Calibration Controls

Enables precise field calibration with non-interactive adjustments for stable, repeatable measurement.

Graphite Displacer Reliability

Four Selectable Ranges (DIP-Switch Adjustable)

Expands measurement versatility from 10 pF to 30,000 pF, accommodating wide dielectric variations.

Temperature-Stable Electronics (±0.01 % / °F)

Maintains consistent performance under changing ambient or process conditions.

Invert Output Option

Switchable 4–20 mA ↔ 20–4 mA output for flexible system integration.

Multiple Probe Materials and Mounting Options

316 SS, Teflon®, Kynar®, or Halar® probes available in rigid or flexible configurations up to 250 ft.

Details

The Cap Analog 4100 converts small changes in dielectric constant between the probe and tank wall into a stable analog output signal. The loop-powered two-wire design eliminates the need for separate power wiring, reducing installation time and complexity—ideal for retrofit projects or remote tank sites.
All electronics are housed within a cast-aluminum, explosion-proof enclosure rated for NEMA 4/4X/7/9 environments. The integral amplifier and temperature-compensated circuitry provide exceptional stability over time, while coating-rejection electronics prevent false readings from buildup or sticky products.
Four selectable capacitance ranges allow one transmitter to cover a broad range of materials—from light hydrocarbons and slurries to powders and granular solids. Field calibration is straightforward via 15-turn zero and span potentiometers, with built-in test points and an invert switch for easy signal verification.
Compatible with PLC and SCADA systems through a standard 4–20 mA output, the Cap Analog 4100 can also pair with Delevan AFI-150 or DFI-150 field indicators for local or remote level readout.

Applications

  • Chemical Processing: Resists chemical attack and provides continuous accuracy in high-dielectric liquids.
  • Wastewater & Environmental: Stable in conductive slurries or foam conditions, eliminating false readings.
  • Food & Beverage: Sanitary probe versions ensure continuous level monitoring without contamination risk.
  • Bulk Storage: Measures solids and granular material where radar or ultrasonic sensors are affected by dust.

Technical Specifications

Parameter Description
Measurement Technology
RF capacitance, integral two-wire transmitter
Output
4–20 mA DC (loop-powered, isolated)
Supply Voltage
24 V DC nominal (12–28 V range)
Load Resistance
Up to 600 Ω @ 24 V DC
Dynamic Range
10 pF – 30,000 pF (four DIP-selectable ranges)
Zero / Span Adjustment
Independent 15-turn potentiometers, non-interactive
Temperature Stability
±0.01 % / °F (±0.018 % / °C)
Probe Mounting
¾″ or 1″ NPT standard; optional flanged connection
Probe Materials
316 SS, Teflon®, Kynar®, or Halar® insulated rods and cables
Operating Temperature (Electronics)
–40 °F to +160 °F (–40 °C to +71 °C)
Process Pressure
Up to 150 psig (10 bar), depending on probe type
Housing
Cast aluminum, explosion-proof and weather-tight (NEMA 4/4X/7/9)
Hazardous Area Ratings
Class I Div 1 Groups C & D; Class II Div 1 Groups E, F, G
Calibration Features
Zero, Span, Cal pots; invert switch; test points (TP1/TP2)
Optional Accessories
Delevan DFI-150 digital field indicator, AFI-150 analog indicator, 920-2A dual set-point supply

Documents and Downloads

Product Flyer

Have a look at the flyer to get all the tech specs and product features. Brochure

User Manual

Read the manual for detailed information and instructions. Manual

Calibrations

Check out a sample cert from our calibration lab. Certificate

Contact Support

If you have a question that we have not covered then just get in touch and we’ll be happy to help.

Contact Us

FAQs

We have tried to answer the most common questions we are asked here.

It uses a two-wire loop-powered design with temperature-stable electronics and coating-rejection circuitry, providing drift-free, low-maintenance measurement.

The primary benefit is reduced wiring cost and complexity. The Cap Analog 4100 draws its power directly from the 4–20 mA signal loop, eliminating the need to run separate power supply cables. This simplifies installation and reduces both the material and labor costs for new and retrofit projects.

Yes. The 4100 features an explosion-proof aluminum housing certified for Class I Div 1 and Class II Div 1 environments.

Operators can use independent zero, span, and calibration potentiometers for quick field tuning, with DIP switches for range selection and an invert option for signal direction.

Absolutely. The standard 4–20 mA output integrates easily with process control and monitoring systems.

Probes are offered in 316 SS, Teflon®, Kynar®, and Halar®, available as rigid rods or flexible cables to suit liquids, slurries, and solids.

The built-in coating-rejection circuit filters out noise from viscous or sticky materials, maintaining consistent accuracy.

The transmitter is designed with a specific probe and circuitry that measures the change in capacitance when the product level changes. The circuitry is able to electronically ignore the capacitance caused by a thin layer of conductive buildup on the probe (1,000 µmho), ensuring the measurement remains stable and accurate despite sticky media.
Yes. The Cap Analog 4100 is versatile enough to be used for level monitoring of bulk solids and granular materials. Unlike other technologies, the RF capacitance principle provides a continuous measurement that is generally not affected by dust or bridging of the material.