Warrick® Conductivity-Based Liquid Level Control The concept is simple: Take advantage of a liquid’s conductive properties to complete a circuit and cause a control relay to actuate. Use of permanently-mounted stationary electrodes gives the user precise accuracy, repeatability and no-moving-parts reliability. Application Versatility Pumps. For feeding of elevated tanks; drainage of wastewater from industrial sumps; batch processing; irrigation and flood control; sewage disposal; seal leakage detection. Boilers. Supervise feedwater flow; critical low water cutoff protection; alarm functions. Steam. Steam cookers; steam generators; evaporators; sterilizers. Automatic shut off of heat source in the event of a low water level; proper water level maintenance through the energizing of a solenoid valve. Drink Dispensers. Control the carbonator tanks’ water level. Page Start High and/or Low Level Alarms. In boilers, process and storage tanks and similar equipment. WARRICK CONDUCTIVITY SENSORS Solenoid Control. As simple on/off devices, for process control. Fuel. Fuel storage tank level detection and leakage indication. Sewage. Sewage and waste water level detection. Specialty Control Panels. System Components The illustration, to the right, graphically defines the typical Warrick® liquid level control system, which includes three basic elements: 1. Controls. The control is an electrical device with contacts that open and close in response to liquid levels sensed by the probes. Because it is wired directly to the power source and to the sensing source, it can send signals that activate or de-activate solenoids, pumps, or alarms. Warrick® controls are available in many different designs and sensitivity ratings for a wide range of application requirements. 2. Fittings. The fitting is a housing that holds the probes (or floats), insulates them from the vessel, and provides a means of connection to the control. Example of Warrick System Application The liquid level control system shown here is designed for “pump up” application. The pump will start refilling the vessel when the liquid reaches the lower probe tip, then stop refilling the vessel when the liquid reaches the higher probe tip. Pump-up system A.C. SUPPLY LINE PUMP STOP Warrick fittings are available for single-probe or multi-probe applications, for mounting to vessels in a variety of ways, and in open or pressure tight styles. ® 3. Probes. The probe is a sensor that extends downward from the fitting, with the tip positioned precisely at the level where the control should be activated. Warrick® probes are available in a variety of materials to suit different liquids and a variety of lengths to fit different depth requirements. Visit www.GemsSensors.com for most current information. GROUND REFERENCE PUMP START

INTRODUCTION Principle of Operation Solid State Controls employ two separate circuits, one for sensing and comparing current flow and one for energizing the output relay. This ‘switch within a switch’ allows solid state controls to operate at much lower secondary voltages (12VAC typical), and much higher sensitivities. Advantages of this technology include reduced shock hazard, one moving part the output relay, wide sensitivity range and latching capability for auto refill or empty applications. Intrinsically Safe Controls are solid state controls which limit current and voltage to a level incapable...

Sensitivity & Material Selection Liquid or Material WARRICK CONDUCTIVITY SENSORS E-3 Acids3 Aluminum Hydroxide Aluminum Sulfate Ammonia Ammonium Chloride Ammonium Hydroxide Ammonium Nitrate Ammonium Sulfate Baby Foods Barium Chloride Barium Nitrate Beer Black Liquor Borax – Aqueous Bourbon Brine Buttermilk Cadmium Chloride Cadmium Nitrate Cake Batter Calcium Chloride Calcium Hydroxide Catsup Caustic Soda Cement Slurry Coffee Corn Syrup Corn – Cream Style Ferric Chloride Ferrous Sulfate Ink (Water Base) Jams/Jellies Juices – Fruit/Vegetable Lithium Chloride Magnesium Chloride Magnesium Hydroxide...

GENERAL PURPOSE PLUG-IN MODULES Series 16 Modules Controls – Solid State Plug-In Modules Compact Size Modular Plug-in Design Various Time Delays Low Voltage Sensor Solid State Reliability LED Monitoring U.L. “Motor Control” Series 16M – General Purpose Control • New Microprocessor Design Designed for either differential or single-level service. U.L. “Motor Controller” listing, 8 pin socket with screw-type connections make the unit easy to install and service. Sensitivity of up to 1 million ohm/cm. Series 16DM/16VM Series 16HM – High Sensitivity Control Series 16HM is similar to Series 16M but...

Use the Bold characters from the chart below to construct a product code. 16M Series – Microprocessor Version Note: For single level service, use “H” and “G” connections. 1. Series 16M General Purpose; 2. Mode of Operation Direct Inverse A – 4.7K E – 100K K – 4.7K P – 100K B – 10K F – 470K L – 10K R – 470K C – 26K G – 1M M – 26K S – 1M D – 50K N – 50K 3. Supply Voltage 1 120 VAC; 2 240 VAC; 3 24 VAC; 8 208/240 VAC 4. Socket Style* A 8 Pin Octal M Module Only B 8 Pin DIN 5. Enclosure 0 None; 1 NEMA 1; 4 NEMA 4 6. Time Delay (increasing level) Option 00-90 seconds Blank 0 seconds 7. Time Delay...

GENERAL PURPOSE OPEN BOARD CONTROLS Series 16 – Open Circuit Board Controls Solid State Reliability Compact Size Spade Terminals Low-Voltage Sensor Time Delays Available LED Monitoring U.L. “Motor Control” Optional Dirty Electrode Detection* AC Current Minimizes Electrolysis Series 16 – General Purpose Control • New Microprocessor Design Engineered for general purpose single-level or differential applications, these economy priced controls have spade terminals for easy wiring and provide sensitivities up to 1 million ohm/cm. Series 16D – DPDT Load Contacts Same features and specifications as...