• Field Selectable Fail-Safe Modes

Relocation of shorting bar links on the chassis assembly provides high or low level fail-safe operation upon loss of electrical power.

• Special Triax Connecting Cable

Any length of cable can be used up to 150 ft. max. without padding or other compensation. Eliminates the effect of cable capacitance with no decrease in sensitivity.

• Ease of Installation & Maintenance

All electronics housed in a remotely mounted control unit provides greater wiring convenience and accessibility to terminal boards & plug-in, dust-tight relay.

• Simplified Calibration

Solid-state indicating light on the chassis aids in initial calibration by eliminating the need for special test equipment.

• Adjustable Time Delay & Differential

Continuous adjustments by means of multi-turn potentiometers provides adjusting the unit to eliminate transient level surges due to splashing, turbulence, etc.

GENERAL DESCRIPTION

The Robertshaw Model 310 LEVEL-TEK is an all new RF capacitance sensing, on-off Control and Display Instrument. Used primarily for detecting and controlling product level changes in vessels or containers, it provides contact closure for external control action by means of a DPDT plug-in type, dust tight relay. The weather-tight unit has alarm lights. This instrument is available with a choice of three supply voltage variations, has adjustable differential (deadband) and adjustable time delay (response time). All adjustments are multi-turn by means of sealed potentiometers.

Suitable for use on liquids and granular materials, the system will detect interface levels, flow-no-flow conditions, and operate under relatively high temperature and pressure conditions. It provides high accuracy, outstanding stability and excellent repeatability despite wide variations in ambient temperature or supply voltage.

The system utilizes a special triaxial cable (eliminates the effect of cable capacitance) as a means of electrically connecting a remotely mounted sensing probe to the control unit. The cable assembly consists of a conduit outlet box and special triaxial cable assembly designed for connection between the probe mounted into the vessel and the remotely mounted display/control unit containing the electronic circuitry.

This design allows easy access to all calibration adjustments when the system is used on elevated tanks or other inconvenient service areas. The conduit outlet box, mounted on the probe assembly, takes up only a small space on the tank.

The Control Unit assembly is available in a weather-tight enclosure with indicating lights for general purpose outdoor applications, or in an explosion-proof enclosure without lights for hazardous area applications.