Global Water 800-876-1172 • globalw.com Global Water Instrumentation, Inc.
Global Water 800-876-1172 • globalw.com Congratulations on your purchase of Global Water’s Water Quality Sensors. 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 • • • • • • • • • • • • 3 III. General Sensor Installation • • • • • 4 IV.
Global Water 800-876-1172 • globalw.com I. Sensor Checklist a. Water Quality Sensor b. Water Quality Sensor Manual II. Inspection a. Your water quality sensor was carefully inspected and certified by our 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 you have received everything needed to operate the water quality sensor.
Global Water 800-876-1172 • globalw.com III. Sensor Installation General a. Water quality 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 quality 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 f. The sensors may be pulsed on or turned on by the logging system prior to taking a reading. Use a warm up time appropriate to the water quality sensor you are using to assure that the sensor is fully on. The sensors can run continuously for real time applications. Each sensor draws between 4 and 19mA depending on whether the sensor is reading at the minimum or maximum of its range. Groundwater g.
Global Water 800-876-1172 • globalw.com IV. Temperature Sensor a. Temperature sensor specifications. Output: Range: Accuracy: Operating Voltage: Current Draw: Warm Up Time: Operating Temperature: Size of Probe: Weight: 4-19mA -50° C to + 50° C ±0.2° F or ±0.1° C 10-36VDC Same as sensor output. 5 seconds minimum -50°C to +100°C 3/4" diameter x 4 1/2" long 1/2 lb. b. The sensor is a two-wire sensor using the red wire for power and the black wire for the output signal.
Global Water 800-876-1172 • globalw.com V. pH Sensor a. pH sensor specifications. Output: Range: Accuracy: Operating Voltage: Current Draw: Warm Up Time: Operating Temperature: Pressure Rating: Size of Probe: Weight: 4-19mA 0-14 pH 2% of full scale 10-36VDC 16.6 mA plus sensor output 3 seconds minimum -5° to +55°C 0-100 psi 1 1/4" diameter x 10" long 1 lb. b. The sensing element is covered with a protective cap while at the Global Water facility to prevent the sensor from becoming damaged.
Global Water 800-876-1172 • globalw.com e. The pH sensor must be stored where the sensing element remains wet or the sensing element will be damaged. It can be stored in a container of clean water or a wet sponge can be placed inside the protective cap shipped with the sensor. Place the cap over the sensing element to keep it wet. The sensor can then be stored on a shelf or hung on a wall. f.
Global Water 800-876-1172 • globalw.com g. Calibration should be checked monthly using the following procedure. You will need the following equipment: 3 small containers 1 bottle of 10pH buffer 1 bottle of 4pH buffer 1 power supply 1 current meter Connecting wires as necessary Connect the sensor to the power supply and current meter in the following way. Attach the black wire to the ground terminal of the power supply. Attach the white wire to the positive input of the current meter.
Global Water 800-876-1172 • globalw.com VI. Conductivity Sensor a. Conductivity sensor specifications. Output: 4-19mA Range: 0-5000 uS Accuracy: 1% of full scale Operating Voltage: 12VDC (+ 5%) Current Draw: 6.5 mA plus sensor output Warm Up Time: 3 seconds minimum Operating Temperature: -40°C to +55°C Size of Probe: 1" diameter x 12" long Weight: 1 lb. Temperature compensation: 2% per °C Electrodes: 316 Stainless Steel b. The Conductivity sensor is a three-wire sensor.
Global Water 800-876-1172 • globalw.com be used for measurements in water samples of different temperatures. Without temperature compensated the conductivity readings would change as the temperature changed, even though the actual ion concentration did not change. CAUTION: When using the sensor in solutions with different temperatures the sensor must be left in the new solution for a minimum of 20 minutes prior to taking a valid reading. f.
Global Water 800-876-1172 • globalw.com VII. Dissolved Oxygen Sensor a. Dissolved Oxygen sensor specifications. Output: Range: Accuracy: Operating Voltage: Current Draw: Warm Up Time: Operating Temp: Size of Probe: Weight: Membrane: Combined Error: 4-19mA 0-100% Dissolved Oxygen +/- 0.5% FS 10-36VDC 11.8 mA plus sensor output 10 seconds minimum -40° to +55°C 1 ¼” diameter x 11” long 1 lb. 0.001 FEP Teflon (standard) 2% FS b.
Global Water 800-876-1172 • globalw.com e. The dissolved oxygen sensor must be stored where the sensing element remains wet or the sensing element will be damaged. It can be stored in a container of clean water or a wet sponge can be placed inside the protective cap shipped with the sensor. Place the cap over the sensing element to keep it wet. The sensor can then be stored on a shelf or hung on a wall. f. Dissolved oxygen (DO) refers to the volume of oxygen that the water contains.
Global Water 800-876-1172 • globalw.com VIII. ORP/Redox Sensor a. ORP/Redox sensor specifications. Output: Range: Accuracy: Operating Voltage: Current Draw: Warm Up Time: Operating Temp: Size: Weight: 4-19 mA -500mV to +500mV 2% of full scale 10-36VDC 13.5 mA plus sensor output 3 seconds minimum 0° to +55°C 1” diameter x 10 ½” long 1 lb. b. The sensing element is covered with a protective cap while at the Global Water facility to prevent the sensor from becoming damaged.
Global Water 800-876-1172 • globalw.com has a high ORP. ORP is measured as a voltage between a platinum wire and a reference electrode. As this voltage goes up, the ORP goes up. The sensor amplifies this voltage and converts it to the 4-20 mA output signal. f.
Global Water 800-876-1172 • globalw.com IX. Maintenance a. Global Water recommends verifying the calibration every 6 months unless specified otherwise. b. The sensors must be cleaned periodically. The suggested cleaning rate depends on the installation area. In dirty areas the sensor should be cleaned weekly. In a clean area they can be cleaned yearly. Begin by checking them after the first week, then wait one month if appropriate and so on. All sensors can be cleaned using water and liquid dish soap.
Global Water 800-876-1172 • globalw.com X. Trouble Shooting Issue: Sensor reading incorrectly a. Verify power source is supplying correct voltage. b. Clean the sensor following the maintenance instructions. c. Check the sensor’s calibration. Other issues d. Call Global Water for tech support: 800-876-1172 or 916-638-3429 (many problems can be solved over the phone). Fax: 916-638-3270 or Email: globalw@globalw.com. When calling for tech support, please have the following information ready; 1. 2. 3. 4. 5.
Global Water 800-876-1172 • globalw.com XI. 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 XII. Appendix A: Calibration Procedures Temperature Calibration check Step 1) Fill a container of water with enough ice that it will not melt quickly. Step 2) Place the temperature sensor and thermometer into the container. Turn on the power supply and the current meter. Let the sensor stabilize for 30 minutes before taking any measurements. Step 3) Record the ice bath temperature, IT = _______, and record the output current of the sensor, IC = _______.
Global Water 800-876-1172 • globalw.com pH Calibration check Step 1) Fill one container with tap water and another with 4 pH buffer solution. Step 2) Place the pH sensor into the container with 4 pH buffer. Turn on the power supply and the current meter. Let the sensor stabilize for 5 minutes before taking any measurements. Step 3) Record the output current of the sensor, W = _______. Remove the sensor and rinse it off in the tap water. Step 4) Fill a container with 10 pH buffer solution.
Global Water 800-876-1172 • globalw.com Conductivity Calibration check Step 1) Fill one container with tap water and another with 5000 uS solution. Ensure that the solution covers the bottom 2” of the sensor. Step 2) Place the conductivity sensor into the container with 5000 uS solution. Turn on the power supply and the current meter. Let the sensor stabilize for 5 minutes before taking any measurements. (20 minutes if the sensor’s temperature is different from the solutions.
Global Water 800-876-1172 • globalw.com Dissolved Oxygen Calibration check Step 1) Fill one container with tap water and another with Zero Oxygen solution. Step 2) Place the dissolved oxygen sensor into the container with the Zero Oxygen solution. Turn on the power supply and the current meter. Let the sensor stabilize for 5 minutes before taking any measurements. Step 3) Record the output current of the sensor, W = _______. Remove the sensor and rinse it off in the tap water.
Global Water 800-876-1172 • globalw.com ORP/Redox Calibration check Step 1) Fill one container with tap water and another with the 100 mV solution. Step 2) Place the ORP/Redox sensor into the container with 100 mV solution. Turn on the power supply and the current meter. Let the sensor stabilize for 5 minutes before taking any measurements. Step 3) Record the output current of the sensor, W = _______. Remove the sensor and rinse it off in the tap water. Step 4) Fill a container with the 465 mV solution.
Global Water 800-876-1172 • globalw.com XIII.
Global Water 800-876-1172 • globalw.com XIV.
Global Water 800-876-1172 • globalw.com Declaration of CE Conformity Global Water Instrumentation, Inc.
