Global Water 800-876-1172 • globalw.com Global Water Instrumentation, Inc.
Global Water 800-876-1172 • globalw.com Congratulations on your purchase of the Global Water WL400 Water Level Sensor. This instrument has been quality tested and approved for providing accurate and reliable measurements. We are confident that you will find the sensor to be a valuable asset for your application. Should you require assistance, our technical staff will be happy to help. Table of Contents I. Checklist • • • • • • Page 3 II. Inspection • • • • • • 3 III.
Global Water 800-876-1172 • globalw.com I. Sensor Checklist a. Water Level Sensor b. Water Level Sensor Manual II. Inspection a. The water Level sensor was carefully inspected and certified by Global Water’s Quality Assurance Team before shipping. If any damage has occurred during shipping, please notify Global Water Instrumentation, Inc. and file a claim with the carrier involved. Use the checklist to ensure that everything needed to operate the water Level sensor was received.
Global Water 800-876-1172 • globalw.com III. Sensor Installation General a. Water Level sensors have many applications and therefore many installation options. All the sensors are fully submersible and may be suspended by their waterproof cables in the water to be monitored. b. Do not install the water Level sensor in applications that contain solvents. Over time, many solvents can deteriorate the cable and the sensing element. c.
Global Water 800-876-1172 • globalw.com g. If the system only accepts voltage signals, the sensor output must be converted to a voltage signal by reading the voltage across a precision resistor in series with the signal wire. Since Ohms Law states that V = IR, if the 4-20 mA signal is dropped across a 250 ohm resistor, the output will be 1 to 5.00volts DC. If the 4-20 mA signal is dropped across a 125 ohm resistor, the output will be halved to 0.5 to 2.50 VDC.
Global Water 800-876-1172 • globalw.com strap. The sensor/straps can be installed at the invert of a sewer or in a pipe, the cable can be attached to a sewer’s stair rungs and run to the data monitoring device. l. When installed in a pipe that is under 12” diameter, the steel straps spring into the pipe, holding the sensor in place. Additional fasteners are usually not required for this type of installation. m. For a sewer pipe over 12” diameter, the sensor’s steel straps must be mounted into the pipe.
Global Water 800-876-1172 • globalw.com IV. WL400 Specifications Sensing element: Sensor Element: Range: Linearity and Hysteresis: Accuracy: Overpressure: Resolution: Outputs: Supply Voltage: Current Draw: Warm Up Time: Operating Temperature: Compensated Range: Housing: Material: Size: Weight: Cable: Conductors: Jacket Material: Optional jacket: Cable O.D.
Global Water 800-876-1172 • globalw.com a. The sensor is a two-wire sensor using the red wire for power and the black wire for the output signal. Warning: Always connect the sensor with the power turned off. b. The water level sensor may be stored without any special provisions. Place the sensor inside a bag to keep the sensor clean and store on a shelf or hang it on a wall. c.
Global Water 800-876-1172 • globalw.com V. Maintenance a. Global Water recommends verifying the sensor’s calibration with a sounder or other measuring device once every 6 months. b. The screen on the end of the sensor must be periodically checked for clogging from mud, sludge, and other debris. Wash the screen with clean water and/or scrub it gently with a toothbrush. Do not insert objects through the screen, as this may cause damage to the sensor. VI.
Global Water 800-876-1172 • globalw.com 5. Repair instructions and/or specific problems relating to the product. Be prepared to describe the problem being experienced including specific details of the application, installation, and any additional pertinent information. b. In the event that the equipment needs to be returned to the factory for any reason, please call to obtain a RMA # (Return Material Authorization). Do not return items without a RMA # displayed on the outside of the package.
Global Water 800-876-1172 • globalw.com X. Warranty a. Global Water Instrumentation, Inc. warrants that its products are free from defects in material and workmanship under normal use and service for a period of one year from date of shipment from factory. Global Water’s obligations under this warranty are limited to, at Global Water’s option: (I) replacing or (II) repairing; any products determined to be defective. In no case shall Global Water’s liability exceed the products original purchase price.
Global Water 800-876-1172 • globalw.com XI. Appendix A: Calibration Procedures Step 1) Step 2) Step 3) Step 4) Step 5) Step 6) Step 7) Turn on the power supply and the current meter. Record the output current of the sensor, IL = _______. Place the water level sensor into the column of water. Record the depth of the sensor (the distance from the tip of the sensor to the top of the column of water, W = _______, and record the output current of the sensor, IH = _______.
Global Water 800-876-1172 • globalw.com XII.