USER GUIDE WQ Series Water Quality Bench‐top Meters Model WQ500 pH, ORP and Temperature Model WQ510 pH, ORP, Conductivity, TDS, Salinity, & Temperature Model WQ530 pH, ORP, Conductivity, TDS, Salinity, DO, & Temp.
Introduction Congratulations on your purchase of the WQ series meter. This bench top device employs leading edge technology with integrated microprocessor for measuring pH, ORP, Conductivity, DO, Salinity, TDS, and Temperature (depending on model). These devices can store 150 labeled readings for recall at a later time and includes a MAX‐MIN memory feature. In addition, the WQ series meters offer a PC interface for data transfer and other remote functionality.
Descriptions METER DESCRIPTION 1. LCD Display 2. Primary Keypad 3. Secondary Keypad 4. Secondary Keypad legend 5. Beaker Test Plate 6. Rear Connection access 7. Electrode holder post 8. Electrode holder LCD DESCRIPTION 1. Measurement type 2. Primary Reading Display area 3. Calibration Mode 4. Calibration error indicator 5. Reading stored indicator 6. MAX/MIN mode icons 7. Recall Mode 8. Lock mode icon 9. Temperature reading 10. Auto temperature condensation 11.
KEYPAD DESCRIPTION Lock the current reading on the LCD. Press and hold for 3 seconds to enter or exit MAX/MIN mode. In MAX/MIN mode, press to browse MAX and MIN readings. Store the current reading. Press and hold for 3 seconds to enter Recall mode. In Recall mode, use the up and down arrows to browse records. Press and hold simultaneously for 3 seconds to enter the advanced setting mode (see Advanced Settings section). Select a measurement function.
Preparation pH, ORP, Conductivity, TDS (Total Dissolved Solids), and Salinity 1. Connect AC adapter to a power source. 2. Remove the protection cap from the electrode and connect to the input connector. 3. Connect the temperature probe to the meter and power on. 4. Rinse the electrode with clean water and wipe dry. DO (Dissolved Oxygen) 1. Connect the DO probe and temperature probe to the meter and remove the protective cap. 2. Carefully remove the membrane cap. 3.
ORP Calibration Calibration is not necessary for ORP. However, ORP should be verified with ORP standard solution to check whether the electrode is in proper working order or not. Conductivity, TDS, and Salinity Calibration 1. Dip the Conductivity cell and the temperature probe into the standard solution 1413 μS/cm. 2. Stir gently and wait until the reading is stable. 3. Press and hold the Power button for 3 sec. to enter the calibration mode. The display will show CAL and 1413μS/cm will flash. 4.
pH Measurement 1. Press MODE to choose pH mode. 2. After calibration, rinse the pH electrode with clean water and wipe it dry. 3. Dip the electrode and the temperature probe into the sample solution that is going to be measured. 4. Stir gently and wait until a stable reading can be obtained. ORP Measurement 1. Insert the ORP electrode, and press MODE to choose ORP mode. 2. Rinse the ORP electrode with clean water and wipe it dry. 3.
Notes: 1. The larger the difference in temperature between the probe and the solution, the longer it will take for the reading to stabilize. Stabilization time can vary from ten (10) seconds to five (5) minutes. 2. Cover the probe with the probe cap. The sponge contained in the cap should be moistened (not soaked) with DI (distilled water) or clean tap water. 150‐Reading Measurement Store and Recall 1. Press the STORE/RECALL button to store the current reading.
Advanced Settings In pH, TDS, or DO mode press the up and down arrows simultaneously for 3 seconds to enter the Advanced Setup mode. pH Advanced Settings 1. In pH setting mode, press STORE/RECALL button to set the pH calibration type. Use the up and down arrows to select USA or NIST. USA and NIST calibration points differ, refer to the Calibration section of this guide for comparison of calibration points. 2. Press MODE to save setting and return to normal operating mode. 3.
Membrane Cap Replacement IMPORTANT NOTE: Only the electrolyte solution supplied by Extech will work correctly for this probe. If a third party solution is used, the probe will not work normally. 1. Do not touch the membrane as skin oils will interfere with the oxygen permeability rate of the membrane. Replace the cap carefully. 2. It is recommended that the probe remain attached to the meter during this replacement process. 3. Unscrew the cap firmly and carefully from the probe. 4.
Specifications pH ORP Range ‐2.00 to 16.00 pH Accuracy ±(0.02%FS + 1d) ‐1999 to ‐200 mV ‐199.9 to 499.9 mV 500 to 1999 mV ±(2%FS + 1 digit) Resolution 0.01 pH 0.1/1 mV o Compensation o ATC: 0 to100 C (32 to 212 F) N/A Conductivity TDS Salt Accuracy 0.0 to 199.9μS 200 to 1999μS 2.00 to 19.99 mS 20.0 to 100.0 mS ±2% FS 0.0 to 131.9 ppm 132 to 1319 ppm 1.32 to 13.19 ppt 13.2 to 66.0 ppt ±2% FS 0.0 to 99.9 ppm 100 to 999 ppm 1.00 to 9.99 ppt 10.0 to 50.0 ppt ±2% FS Resolution 0.1/1μS/0.
