OPERATING MANUAL MODEL NO MODEL NO AND MODEL NO MODEL NO

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1 OPERATING MANUAL LIQUI-SENSE CONTROLLERS MODEL NO MODEL NO AND LIQUI-SENSE DETECTORS MODEL NO MODEL NO Cole-Parmer Instrument Co. 625 East Bunker Court Vernon Hills, Illinois U.S.A (847) (847) (fax) A Edition 03 Tue Sep 26 14:32:

2 EU Declaration of Conformity Name of Apparatus: Liqui-Sense Controller Model Numbers: Description of Apparatus: Fluid Monitor System Barnant Company declares that the above model is in conformity to the following harmonized standards and directives: Applicable Directives 73/23/EEC 93/68/EEC 89/336/EEC 92/31/EEC 93/68/EEC Applicable Specifications EN /A2: 1995 EN /A1: 1998 Manufacturer s Report Number TR9516 TR9519 The last two digits of the year in which the current configuration of the above models was assessed per the Low Voltage Directive is: 00. Manufacturer: Barnant Company Division Cole-Parmer Instrument Company 28W092 Commercial Avenue Barrington, IL USA Tel.: Manufacturer s Signature: James W. Doll Vice President, Engineering 22 August, 2000 Date WARNINGS: WARNING: CAUTION: SAFETY PRECAUTIONS If the equipment is used in a manner other than as specified, protection provided by the equipment may be impaired. No user serviceable parts are inside of this Controller. Refer servicing to your dealer. The LIQUI-SENSE Controller must be positioned so leaking liquid will not enter the rear power connectors. Use of a power line with a Ground Fault Interrupt (GFI) is recommended. Use with caustic liquids not compatible with detector materials voids warranty. i Tue Sep 26 14:32:

3 TABLE OF CONTENTS Title Page SAFETY PRECAUTIONS i INTRODUCTION APPLICATIONS DESCRIPTION... 6 INSTALLATION AND SETUP OPERATION Operator Control and Indicators Startup Procedure Operational Checks SENSITIVITY ADJUSTMENT MAINTENANCE AND TROUBLESHOOTING Fuse Replacement Cleaning Troubleshooting ACCESSORIES SPECIFICATIONS WARRANTY PRODUCT RETURN TECHNICAL ASSISTANCE APPENDIX A: AUXILIARY CABLE CONNECTIONS Only the Model LIQUI-SENSE Controller is UL and cul listed. Trademarks bearing the symbol in this publication are registered in the U.S. and in other countries. 1 Tue Sep 26 14:32:

4 INTRODUCTION The LIQUI-SENSE Controller is a two-channel alarm system used to sense liquid leaks using a specially designed detector or used with other liquid detectors such as high or low liquid level detectors. The Model LIQUI-SENSE Controller operates from 115V AC and the Model operates from 230V AC. When an alarm condition is sensed on either channel, the LIQUI-SENSE Controller can perform the following actions: Disconnect power to a pump drive. Activate an auxiliary pump drive to resume pumping through a second pump drive. Activate the front panel red ALARM ON indicator. Sound an audible alarm if the audible alarm is enabled. Provide a contact closure output that can be used to activate an Environment Monitor for automatically telephoning the user of the failure, or to activate any other device that operates from a contact closure input. The contact closure may also be used to operate shut-off or switchable valves to redirect flow. The LIQUI-SENSE Detector Model (detector with cable) or Model (detector without cable) is used to sense leaks in pump heads resulting from ruptures of the tubing. This detector is not supplied with the unit and must be ordered separately. (See ACCESSORIES.) 2 Tue Sep 26 14:32:

5 APPLICATIONS The LIQUI-SENSE Controller and LIQUI-SENSE Detector can be used with a wide variety of different pump systems for leak detection. The alarm controller has two inputs. These can both be used with LIQUI-SENSE Detectors, or one input can be used with a LIQUI-SENSE Detector and the second input used with other type detectors such as a liquid level detector for determining high or low levels in a container. Figures 1 through 5 show various suggested detector arrangements in different pump systems. Tubing is omitted for clarity. Figure 1. Typical B/T RAPID-LOAD Pump with LIQUI-SENSE Detector positioned under open side of pump 3 Tue Sep 26 14:32:

6 Figure 2. Typical L/S Cartridge Pump with two LIQUI-SENSE Detectors centered under the group of cartridges Figure 3. Typical L/S EASY-LOAD Pump with LIQUI-SENSE Detector positioned under main pump, auxiliary pump mounted on top of main pump and both pumps connected to Alarm Controller for automatic switch over when a leak is detected 4 Tue Sep 26 14:32:

7 Figure 4. Typical I/P EASY-LOAD Pump with LIQUI-SENSE Detector centered under the pump and a level detector connected to the second input of the Alarm Controller Figure 5. Standard Stacked Pump System with two LIQUI-SENSE Detectors positioned for optimum leak detection 5 Tue Sep 26 14:32:

8 DESCRIPTION The LIQUI-SENSE Controller, shown in Figure 6, is used to monitor various liquid detector devices. When an alarm condition is detected, the controller deactivates the rear panel MAIN OUTPUT power connector and supplies power to the AUXILIARY OUTPUT power connector. Also, when the alarm condition is detected, a contact closure output is provided at the rear panel CONTACT CLOSURE OUTPUT connector (a 1/8-inch phone-type connector) for activating remote devices such as an Environment Monitor or a second pump drive. The fault condition is indicated by a red ALARM ON indicator on the front panel and by an audible alarm (unless the ALARM AUDIBLE switch has been set to OFF). Figure 6. LIQUI-SENSE Controller (Alarm Module) The MAIN and AUXILIARY connectors, shown in Figures 7 and 8, are used to connect to external devices such as pumps. The pump connected to the MAIN OUTPUT connector will operate when no alarm condition exists. When an alarm condition is detected, power to the MAIN OUTPUT connector is turned off and power is applied to the AUXILIARY OUTPUT connector. Thus, if no pump is connected to the AUXILIARY OUTPUT connector, pumping will cease. If a pump is connected to the AUXILIARY OUTPUT connector, that pump will be turned on. The switch over occurs within one second after detection of an alarm condition. 6 Tue Sep 26 14:32:

9 Figure 7. Rear Panel Model (115V AC) Figure 8. Rear Panel Model (230V AC) Power is applied to the unit through a permanently attached line cord on the 115V AC model and through an IEC 320/CEE 22 connector coupler (female line cord/male socket) on the 230V AC units. A number of accessory input and output power cords are available. (See ACCESSORIES.) The power is controlled by the rear panel OFF-ON switch. Power-on is indicated by a front panel green POWER ON indicator. The CONTACT CLOSURE OUTPUT connector (rear panel) provides a latched contact closure output, rated 30V DC at 1 ampere max., when an alarm condition is detected. This output can be connected to an Environment Monitor, which then can telephone the user to signal the alarm condition. This output can also be connected to any device that operates from a contact closure condition, such as a warning system. An accessory cable is listed in the ACCESSORIES Section. 7 Tue Sep 26 14:33:

10 The locking modular INPUT connectors (front panel) connect to external detectors. Each input has a SENSITIVITY adjustment that is used only with the LIQUI-SENSE Detectors. The sensitivity is factory set so that when the detector is placed within one inch of the pump, less than one ml of water-based liquid will trigger the detector. For other types of liquids, or to change the sensitivity level, refer to the SENSITIVITY ADJUSTMENT Section. Sensitivity adjustment may be required when operating with cables longer than 3-1/2 feet or in a high-temperature, high-humidity environment. The LIQUI-SENSE Controller is housed in a slate gray ABS plastic enclosure, with aluminum front and rear panels. The unit can be placed on a flat surface, on a support platform or on the top surface of some MASTERFLEX or other type pumps. The LIQUI-SENSE Detector Model (with cable) or Model (without cable), Figure 9, operates on a capacitance change principle. The detector is designed to be placed under the pump.if a leak occurs in the pump tubing, the liquid will fall on the top surface of the detector. When sufficient surface area is moistened (less than 1 ml of water-based liquid when using the factory sensitivity setting), the change in capacitance is sufficient to activate the alarm circuits. The detector has a locking modular type connector. The cable between the detector and the controller is 3-1/2 feet long with modular locking connectors on both ends. Ten-foot and fifteen-foot accessory cables are available. Refer to APPENDIX A for pin configuration for the cables when connecting other detector types. Figure 9. LIQUI-SENSE Detector Model A four-inch hook-and-loop fabric fastener strip allows for attachment of the detector pad to a flat surface to prevent the detector pad from moving. The detector pad can also be permanently mounted by attaching it to a flat surface with two #4 screws. The screw locations at the corners of the detector pad are indicated by two circular markers. The detector structure will need to be punctured by the screw for permanent attachment. 8 Tue Sep 26 14:33:

11 INSTALLATION AND SETUP NOTE: Retain all packing materials until proper operation has been verified. WARNING: The LIQUI-SENSE Controller must be positioned so leaking liquid will not enter the rear power connectors. Use of a power line with a Ground Fault Interrupt (GFI) is recommended. Proceed as follows to setup the LIQUI-SENSE Controller: 1. Place the rear panel power OFF-ON switch in the OFF position. NOTE: For 115V AC pump models, the pump power cord will plug directly into the MAIN OUTPUT or AUXILIARY OUTPUT connectors on the rear panel of the LIQUI-SENSE Controller. For 230V AC models, use pump cable for pumps with European connectors or pump cable for pumps with other style connectors. 2. Connect pumps as follows: a. If a main pump and a standby (auxiliary) pump are to be used, connect the main pump to the MAIN OUTPUT connector on the rear panel and connect the standby (auxiliary pump) to the AUXILIARY OUTPUT connector. b. If only the main pump is to be used with no standby, and the pump is to shut down when an alarm condition exists, connect the main pump to the MAIN OUTPUT connector. The AUXILIARY OUTPUT connector can be used to power other devices such as lights, remote alarms or other equipment. c. If only the main pump is to be used with no standby, and the pump is not to shut down when an alarm condition exists, connect the main pump to a separate power source. The MAIN OUTPUT connector and the AUXILIARY OUTPUT connector can be used to power other devices such as lights, remote alarms or other equipment. 3. Connect one end of the detector cable(s) to the front panel INPUT connector(s) and the other end to the desired detector(s). Only one detector can be connected to each INPUT connector. Detectors must be connected using a cable configured as shown in APPENDIX A. Make sure cable connections are secure or unit will not function properly. 4. The LIQUI-SENSE Detector must be positioned under the pump so that any leakage will drip onto the detector pad target area (area outlined with the black lines). The detector can be secured in place using hook-and-loop fabric fasteners or can be permanently fastened with #4 screws. Two circular marks are located on the outer edge of the detector 9 Tue Sep 26 14:33:

12 for position of screws. Do not insert screws in any other location on the detector pads. The location of the detector for various typical pumps are as follows: a. For a typical B/T RAPID-FLOW pump, the detector should be located directly under the opening at the right side of the pump as shown in Figure 10. Figure 10. Positioning a LIQUI-SENSE Detector under a B/T RAPID-FLOW Pump b. For typical L/S Cartridge pumps, the detector should be centered under the group of cartridges. For large numbers of cartridges, use two detectors as shown in Figure 11. Figure 11. Positioning LIQUI-SENSE Detectors under an L/S Cartridge Pump 10 Tue Sep 26 14:33:

13 c. For typical L/S EASY-LOAD pumps, the detector should be centered directly under the weep hole as shown in Figure 12. Figure 12. Positioning a LIQUI-SENSE Detector under an L/S EASY-LOAD Pump d. For typical I/P EASY-LOAD pumps, two weep holes are located under the pump. A single detector can be centered under the weep holes as shown in Figure 13. For better reliability, two separate detectors can be used with one centered under each weep hole as shown in Figure 14. Figure 13. Positioning a single LIQUI-SENSE Detector under an I/P EASY-LOAD Pump 11 Tue Sep 26 14:33:

14 Figure 14. Positioning two LIQUI-SENSE Detectors under an I/P EASY-LOAD Pump e. For typical standard stacked pumps where only one or two pumps are used, a single detector can be centered under the stack of pumps. When a larger number of pumps are used, two detectors should be positioned to assure optimum leak detection as shown in Figure 15. Figure 15. Positioning two LIQUI-SENSE Detectors under a stack of Standard Pumps 12 Tue Sep 26 14:33:

15 5. If an Environment Monitor (such as a COLE-PARMER Model 08330) is to be used or if another external device requiring a contact closure to activate it is to be used, connect the 1/8-inch phone cable connector from the rear panel CONTACT CLOSURE OUTPUT connector to the external device. 6. Connect the LIQUI-SENSE Controller POWER INPUT cord as follows: a. For 115V AC unit, connect line cord to 115V AC 50/60 Hz power source. b. For 230V AC unit, connect power cable between rear panel POWER INPUT connector and 230V AC 50/60 Hz power source. This completes the electrical connectors. Proceed with the OPERATION Section. OPERATION Operator Controls and Indicators All operator controls except the power OFF-ON switch are located on the front panel as shown in Figure 16. These controls and indicators are as follows: POWER ON Indicator Green LED illuminates when power OFF-ON switch is in the ON position and input power is present. SENSITIVITY Controls Adjusts the sensitivity of the circuit for use with the LIQUI-SENSE Detectors. (Pre-set at factory for typical applications.) ALARM TEST Momentary push-button. Tests the audible alarm, the visual alarm, the switching of AC power from the rear panel MAIN OUTPUT to the AUXILIARY OUTPUT connectors and the contact closure at the rear panel CONTACT CLOSURE OUTPUT connector. These are activated while the button is pushed and reset automatically upon release. ALARM ON Indicator Red LED illuminates when an alarm condition is present. 13 Tue Sep 26 14:33:

16 ALARM RESET ALARM AUDIBLE OFF-ON Switch Power OFF-ON Momentary push-button. Resets alarm circuits after alarm condition is removed (detector pad wiped clean, tank filled, etc.). While push-button is held in, the system reverts to the non-alarm condition. If the alarm condition is not cleared when the ALARM RESET switch is released, the unit will go back into the alarm condition. It may be convenient to hold in the ALARM RESET button while priming or purging the system when a level detector is used. In the OFF position, the audible alarm will not sound during an alarm condition. In the ON position, the audible alarm will sound during an alarm condition. Rocker type switch located on rear panel. Disconnects all AC power from unit and from equipment connected to the MAIN OUTPUT or AUXILIARY OUTPUT connectors. Figure 16. LIQUI-SENSE Controller Front Panel 14 Tue Sep 26 14:33:

17 Startup Procedure 1. Check that all connections have been made as described in the INSTALLATION Section. 2. Check that detectors are connected and properly positioned. Only one detector can be connected to each channel. Use hook-and-loop fabric fasteners to secure detector in position or, if permanent mounting is desired, detector can be attached with #4 screws as described in the INSTALLATION Section. NOTE: Tubing may break at locations other than expected. Using a second detector can provide for better detection. 3. If the audible alarm is to operate, set ALARM AUDIBLE switch to the ON position. If no audible alarm is desired, place ALARM AUDIBLE switch in the OFF position. 4. Set rear panel power OFF-ON switch to the ON position and check that the front panel green POWER ON indicator is lit. The equipment should now be operating normally. 5. If an alarm condition exists, proceed to the SENSITIVITY ADJUSTMENT Section. If level detectors are used, they may need to be inverted or rotated 180 for proper operation. The audible alarm can be turned off by placing the ALARM AUDIBLE switch in the OFF position. 6. Perform the LIQUI-SENSE Detector Sensitivity Check using drops of the same liquid used in your application. Operational Checks LIQUI-SENSE CONTROLLER An operational check of the LIQUI-SENSE Controller can be performed using the ALARM TEST switch. This test should be performed only when temporary transfer of power from the MAIN OUTPUT connector to the AUXILIARY OUTPUT connector will not be disruptive. Proceed as follows: 1. Set the ALARM AUDIBLE switch to ON for the audible alarm to be activated or to OFF to deactivate the audible alarm. 2. Set power OFF-ON switch to ON position and check that POWER ON indicator is illuminated. 3. Press and hold the ALARM TEST SWITCH. Check that the audible alarm sounds (if activated), the ALARM ON indicator is illuminated, that power shifts from the MAIN OUTPUT connector to the AUXILIARY OUTPUT connector and that the CONTACT CLOSURE OUTPUT activates any equipment connected to the output. 15 Tue Sep 26 14:33:

18 LIQUI-SENSE DETECTOR SENSITIVITY CHECK The LIQUI-SENSE Detector sensitivity may be checked as follows: 1. Connect detector to one of the front panel INPUT connectors, if not already connected. 2. Place water one drop at a time on the detector pad. Do not drop water from more than one inch. 3. Check number of drops required to activate alarm. Pre-set factory setting should activate alarm with less than 1 ml of liquid. If activation level is not as desired, refer to SENSITIVITY ADJUSTMENT Section. 4. After activating alarm, momentarily press then release the RESET button. Alarm condition should still be present. 5. Wipe detector surface clean with a dry cloth and momentarily press, then release, the RESET button. Alarm condition should terminate, ALARM ON indicator should extinguish and, if activated, audible alarm should turn off. SENSITIVITY ADJUSTMENT Generally, no sensitivity adjustment of the LIQUI-SENSE Controller is required. However, various liquids or environmental conditions such as temperature and humidity may require adjustment of the SENSITIVITY controls for use with the LIQUI-SENSE Detectors. The SENSITIVITY adjustment is accessed through the small hole adjacent to each INPUT connector. Contact closure or logic level detectors do not require adjustment of the SENSITIVITY control. If the factory default setting for sensitivity is not activating the alarm, or is falsely activating the alarm for the liquid being sensed, adjust the input sensitivity with one channel connected at a time. Turn the SENSITIVITY control clockwise to increase sensitivity (fewer drops will activate) or counterclockwise to decrease sensitivity. NOTE: If the sensitivity is increased so much that the red ALARM ON indicator illuminates, the RESET button must be depressed each time sensitivity is decreased until the indicator extinguishes. Normal sensitivity adjustment is between one-quarter and two turns counterclockwise from the activation point. The activation point is defined as that sensitivity set when ALARM ON indicator just illuminates. Refer to Table 1 for typical sensitivity settings for various liquids. The middle column indicates the number of turns counterclockwise from the activation point that the 16 Tue Sep 26 14:33:

19 sensitivity control should be set for proper operation. The last column indicates the quantity of fluid required in the target area of the detector to activate the detector. Sensitivity will change with detector position or when used near metallic objects (e.g., table). Also, sensitivity changes when using longer (optional) cables. CAUTION: Use with caustic liquids not compatible with detector materials voids warranty. Table 1. Typical Sensitivity Settings Fluid Type Setting (Turns ccw from activation point) Nominal Volume Distilled Water <1mL Tap Water <1mL Acetic Acid (10% max.) <0.5mL Alcohols <0.5mL Glycerin <2.0mL 10W Motor Oil 1 2 <2.0mL WARNING: MAINTENANCE AND TROUBLESHOOTING No user serviceable parts are inside of this Controller. Refer servicing to your dealer. Fuse Replacement The 115V AC LIQUI-SENSE Controller uses a 10-A Slo-Blo fuse (3AG, part number B ), which is located in the fuse holder on the rear panel. The 230V AC LIQUI-SENSE Controller uses a 6.3-A fuse (5 x 20 mm, part number B ), which is located in the drawer in the POWER INPUT connector on the rear panel. Replace only with the correct fuse. Cleaning Clean the top surface of the detector pad with a soft, dry cloth. If liquid cleaner is used, rinse and dry thoroughly before resuming operation. Keep the LIQUI-SENSE Controller enclosure clean by using a mild detergent. Never immerse or use excess fluid. 17 Tue Sep 26 14:33:

20 Troubleshooting The following chart will help identify most problems that can be corrected by the operator. If the fault cannot be located, return unit for servicing. Troubleshooting Chart SYMPTOM CAUSE REMEDY POWER ON indicator does not illuminate with Power OFF-ON switch in ON position ALARM LIGHT illuminates but audible alarm does not sound Alarm does not activate for a fault condition RESET button does not reset unit when depressed Alarm activated but pump continues to operate Alarm activated but auxiliary pump does not turn on Fuse blown Power cord not plugged into active power source ALARM AUDIBLE switch not set to ON position Detector not connected Sensitivity set too low Detector cable defective Detector inoperative Fault not cleared Sensitivity set too high RESET button failure Pump not connected to MAIN OUTPUT but directly to a power source Auxiliary Pump not connected to AUXILIARY OUTPUT Replace fuse Plug in power cord Set switch to ON position Connect detector Increase sensitivity (LIQUI-SENSE Detector only) Replace cable Replace detector Clear fault Lower sensitivity (LIQUI-SENSE Detector only) Return unit for servicing Connect pump to MAIN OUTPUT for shutdown when an alarm condition is sensed. Connect auxiliary pump to AUXILIARY OUTPUT 18 Tue Sep 26 14:33:

21 ACCESSORIES The accessories and service parts listed below are available from your dealer. Part Name Part Number LIQUI-SENSE Detector Pad and 3.5 ft Cable LIQUI-SENSE Detector Pad Cable, Detector Pad, 3.5 ft Cable, Detector Pad, 10 ft Cable, Detector Pad, 15 ft IEC320M/IEC320F Pump power cable (connects modular plug to LIQUI-SENSE Controller) IEC320F/F Pump power cable (connects European plug to LIQUI-SENSE Controller) Cable with 1/8-inch phone plug Out-of-Liquid Detector Power Cords for 230V AC Controllers European (standard) British Swiss Italian NEMA Type 6-15P Fuse 115V: 10A, 250V, SLO-BLO, 3AG B V: T6.3A, 250V, 5 20mm B Tue Sep 26 14:33:

22 SPECIFICATIONS Output: Contact Closure Output Rating: 30V DC 1 Ampere Maximum Audible Alarm Sound Level: 90 dba Input: Line Voltage Limits (115V AC Controller): V AC 50/60 Hz Single Phase* (230V AC Controller): V AC 50/60 Hz Single Phase Power Dissipation: 1.2 kva maximum AC Line Current: 10 A max at 115V AC 6.3 A max at 230V AC Installation Category: Installation Category II per IEC 664 (Local level appliances, portable equipment, etc.) Construction: Controller Dimensions: 3 in H 8.1 in W 6.3 in D LIQUI-SENSE Detector Dimensions: 5.0 in 2.6 in Weight: 3 lbs Detector Cable Length: 3.5 feet (others available) Enclosure Rating: IP22 per IEC 529 Environment: Operating Temperature Range: 0 C (32 F) to 40 C (104 F) Storage Temperature: 45 C ( 49 F) to 65 C (149 F) Humidity (non-condensing): 10 to 85% Barometric Pressure: 75 to 106 kpa Altitude: less than 2000 m Pollution Degree: Pollution Degree 2 per IEC 664 (Indoor Usage lab, office) Chemical Resistance: LIQUI-SENSE Controller: LIQUI-SENSE Detector: All materials withstand common cleaning solvents. Construction materials used are polyester labels, ABS plastic enclosure and zinc-plated screws. Top layer Flat polyester attached with polyester laminate. Bottom layer Polyester attached with polyester laminate. Connector is ABS plastic. Compliance: 115V: UL508, CSA C22.2, No. 14-M91 230V (For CE Mark): EN /A2: 1995 (EU Low Voltage Directive) and EN /A1: 1998 (EU EMC Directive) * Unit operating voltage range as tested by Underwriters Laboratories. This unit has been designed and tested by the manufacturer for an extended operating voltage range of V AC. 20 Tue Sep 26 14:33:

23 WARRANTY The Manufacturer warrants this product to be free from significant deviations from published specifications. If repair or adjustment is necessary within the warranty period, the problem will be corrected at no charge if it is not due to misuse or abuse on your part, as determined by the Manufacturer. Repair costs outside the warranty period, or those resulting from product misuse or abuse, may be invoiced to you. The warranty period for this product is noted on the Warranty Card. PRODUCT RETURN To limit charges and delays, contact the seller or Manufacturer for authorization and shipping instructions before returning the product, either within or outside of the warranty period. When returning the product, please state the reason for the return. For your protection, pack the product carefully and insure it against possible damage or loss. Any damages resulting from improper packaging are your responsibility. TECHNICAL ASSISTANCE If you have any questions about the use of this product, contact the Manufacturer or authorized seller. We reserve the right to make improvements in design, construction and appearance of our products without notice. 21 Tue Sep 26 14:33:

24 APPENDIX A AUXILIARY CABLE CONNECTIONS Each Cable Assembly is 3-1/2 feet long and is composed of a 6-conductor shielded flat cable with PVC jacket. Ten-foot and fifteen-foot cables are also available. Six pin modular plugs are attached at each end. Refer to the following chart for pin output: Pin Signal Color 1 Ground Black 2 Contact Closure or Logic Low White Input 3 12V DC Red 4 Capacitive Plate Input Green 5 Capacitive Plate Input Brown 6 Shield Guard Bare Tin For level detector (sensors) connections, cut off one end of the six conductor flat cable, or cut the cable in half, if using longer cables, to make two pieces. Strip the shield (metal) and plastic jacket back two inches. Spread the wires. Strip back one inch of the black wire, pin 1, and white wire, pin 2. Fold the other wires back along the plastic jacket and tape or cut off as desired. Twist one lead of the level detector to the black lead of the cable, pin 1, and twist the other lead of the level detector to the white lead of the cable, pin 2. Solder the two connections together or use a wire nut if possible. Tape around exposed bare wire areas. Figure A-1. Level Sensor Connections 22 Printed in U.S.A Tue Sep 26 14:33: