OPERATING INSTRUCTIONS 16. Warranty OAKTON warrants this meter to be free from significant deviations in material and workmanship for a period of three years from date of purchase. OAKTON warrants this probe to be free from significant deviations in material and workmanship for a period of six months from date of purchase.
Table of Contents 6.5 Program 4.0: Resetting to factory default settings (pH)...............................................31 1. Introduction............................................................................................4 6.6 Program 5.0: Viewing previous conductivity/TDS calibration data..........................32 2. Display and keypad functions .............................................................5-6 6.7 Program 6.
1. Introduction 2. Display and Keypad Functions Thank you for selecting an OAKTON meter. This OAKTON portable meter is a microprocessor-based instrument that measures pH, conductivity, TDS and temperature! Your meter has many user-friendly features, all of which are accessible through the membrane keypad. Your meter includes a single-junction pH electrode, a combination conductivity/ temperature probe, and batteries. Please read this manual thoroughly before operating your meter. 2.
2.2 Keypad 3. Preparation The large membrane keypad makes the instrument easy to use. Each button, when pressed, has a corresponding graphic indicator on the LCD. ON/OFF............Powers and shuts off the meter. 3.1 Inserting the Batteries HOLD ..............Freezes the measured reading. To activate, press HOLD while in measurement mode. To release, press HOLD again. NOTE: When auto endpoint feature is switched on, meter automatically holds reading after 5 seconds of stability.
3.2 Probe information Your meter includes two probes: To connect the pH electrode: 1. Slide the BNC connector of the probe over the BNC connector socket on the meter. Make sure the slots of the connector are in line with the posts of the socket. Rotate and push the connector clockwise until it locks. • pH electrode with BNC connector • conductivity/TDS/temperature probe with a notched 6-pin connector See figure below.
4.3 4. Calibration 4.1 Important Information on Meter Calibration When you recalibrate your meter, old calibration points are replaced on a “point by point” basis in pH, and on a “range by range” basis in conductivity or TDS. For example: pH calibration We recommend that you perform at least a 2-point calibration using standard buffers that bracket (one above and one below) the expected sample range.
4. Press CAL/MEAS to enter pH calibration 4.3 mode. The CAL indicator lights. The primary display will show the measured reading while the smaller secondary display will indicate the pH standard buffer solution. Calibrate up to 5-point conductivity or 5 point TDS calibration at one point per range: CAL READY See figure B pH pH 5. Wait for the measured pH value to B stabilize. If the READY indicator has been activated (set up program P3.
To calibrate conductivity: Calibrating for TDS directly MEAS 1. If necessary, press the MODE key to READY select conductivity mode. µS See figure A C 2. Rinse the probe thoroughly with ATC de-ionized water or a rinse solution, then rinse with a small amount of calibration standard. The factory default setting for TDS conversion factor is 0.5. If your solution has a different TDS factor, you can improve calibration accuracy by setting the TDS factor prior to calibration. See SetUp Program P7.
4.5 Temperature calibration 5. Measurement The temperature sensor (located in the conductivity cell) is factory calibrated. Calibrate your sensor only if you suspect sensor drift that may have occurred over a long period of time or if you have a replacement probe. 5.1 Temperature calibration Taking pH Measurements To take readings: 1. Make sure the conductivity cell (or 1. Rinse the pH electrode with deionized alternative temperature element) is attached to the 6-pin connector.
5.2 Taking Conductivity or TDS Measurements 5.3 This feature lets you freeze your reading for a delayed observation. HOLD can be used any time when in MEAS mode. To take readings: 1. Rinse the probe with deionized or distilled water before use to remove any impurities adhering to the probe body. Shake or air dry. To avoid contamination or dilution of your sample, rinse probe with a small volume of your sample liquid. 1. To hold a measurement, press the HOLD key while in measurement mode.
5.4 Using manual ranging function: conductivity/TDS 5.5 When shipped from the factory, your meter automatically selects the range in which your readings appear. The manual ranging function lets you select the specific range in which you want to work. From measurement mode: press the RANGE key while in Conductivity measurement mode. The first range will appear on the display. The “MEAS” indicator blinks, and the “Range” number flashes briefly in the lower display. Conductivity: 0.00-19.99 µS 0.0-199.
5.6 Selecting the manual temperature compensation value To use manual temperature compensation, you need to enter the temperature value of your process into the meter. This is the value at which readings will manually temperature compensate. You can select any temperature between 0 and 100°C (32 and 212°F). Default value is 25°C (77°F). The advanced set up mode lets you customize your meter’s preferences and defaults.
6.1 Advanced set-up mode detailed overview Sub groups available from conductivity/TDS measurement mode Press the SETUP key to enter Set up mode. Press the ▲ and ▼ keys to scroll through sub groups. P5.0: Viewing Con./TDS calibration data SETUP mS µS ppt ppm Sub groups available from pH measurement mode SETUP CAL P1.0: Viewing pH calibration data Instructions on page 32 pH P1.1 View previous pH calibration data (pH 1.68) P1.2 View previous pH calibration data (pH 4.01) P1.
6.2 P1.0: Viewing previous pH calibration data 6.3 This mode lets you recall previous pH calibration data, which lets you know at which points this meter was previously calibrated. This is a “view only” mode. Program 2 has two “view only”options that lets you check the pH electrode parameters for diagnostic purposes. It lets you view: P2.1: Electrode offset P2.2 Electrode slope From measurement mode: 1. Press the Mode key to select pH From measurement mode measurement mode. SETUP 2.
6.4 P3.0: pH measurement configuration P3.2: Selecting number of pH calibration points Program P3.2 lets you select the number of pH calibration points the meter will use in calibration mode: 2, 3, 4, or 5. The meter will automatically exit calibration mode after you have calibrated to your selected number of points. P3.1: READY indicator and auto endpoint function This program lets you select: • “READY indicator on” to indicate when the reading is stable.
P3.3 Selecting °C or °F 6.5 This meter lets you select between °C and °F units for temperature readings. This program lets you reset all pH parameters to factory default settings. This clears all calibration data any other pH setup functions you might have changed. The following settings will remain as you have set them: From measurement mode SETUP 1. Press the Mode key to select pH pH measurement mode. 2. Press Setup key to enter Set Up mode. 3.
6.6 P5.0: Viewing previous conductivity/TDS calibration data This mode lets you recall previous conductivity or TDS calibration data, which lets you know at which points this meter was previously calibrated. This is a “view only” mode. TDS values are proportional to conductivity values. Note that if you calibrate a TDS value in an equivalent conductivity range, the TDS value will replace the previous conductivity value, and vice versa. 6.
6.8 P7.0: Conductivity/TDS measurement configuration P7.2 Selecting °C or °F This meter lets you select between °C and °F units for temperature readings. P7.1: READY indicator and auto endpoint function This program lets you select: From measurement mode • “READY indicator on” to indicate when the reading is stable. 2. Press Setup key to enter Set Up mode. From measurement mode See figure C mS µS ppt ppm 2. Press Setup key to enter Set Up mode. 3.
P7.3 Selecting Automatic or Manual Temperature Compensation P7.4 Setting the TDS factor This feature lets you select between Automatic Temperature Compensation (ATC) and Manual Temperature Compensation for conductivity (it lets you deactivate the temperature sensor in the conductivity/TDS probe). Meter default is ATC. The concentration of salts dissolved in solution increases the conductivity of that solution.
6.9 P8.2 Selecting the normalization temperature P8.0: Temperature Settings P8.1 Selecting the temperature coefficient The temperature coefficient is the amount of change in conductivity per degree of temperature; it is expressed in percent per °C or °F. Entering the exact temperature coefficient of your solution lets you accurately compensate temperature for almost any solution*. You can adjust 0.0 to 10.0% per °C or °F. Meter default is 2.1% per °C or °F. From measurement mode 1.
6.10 P9.0: Resetting to factory default settings (conductivity/TDS) This program lets you reset all conductivity parameters to factory default settings. This clears all calibration data any other conductivity setup functions you might have changed. The following settings will remain as you have set them: • temperature unit of measure (°C or °F) • The temperature offset calibration value • All pH calibration data and parameters pH electrode care pH electrode storage SETUP MEAS 1.
pH electrode activation (for glass bodied electrodes only) WARNING: Only qualified persons proficient with the safe handling of dangerous chemicals should perform the procedure below. Provide proper containers, fume hoods, ventilation, and waste disposal. Safety goggles and protective clothing must be worn while performing this procedure. If possible, replace with another electrode instead of performing this reactivation procedure. 8.
9. Error Messages LCD Display 10. Specifications Indicates Cause Solution Err annunciator Unrecognized input from keypad Wrong input in selected mode. Release key. Select valid operations depending on mode. CAL & Err annunciators blink Calibration error Wrong value input at calibration. Dirty probe. Check your input value, clean probe. See Calibration sections or Probe Maintenance section. Battery indicator blinks Low battery level Need new batteries or battery connection is bad.
OAKTON “Singles” pH calibration solution pouches 11. Accessories pH solutions have ±0.01 pH accuracy at 25°C. Shpg wt 1.1 lb (510 g) per box. WD-35653-00 Deionized rinse water solution pouches, 20/box. Meters WD-35631-00 pH/CON 300 meter. Includes pH electrode, conductivity probe with built-in ATC element, batteries, and instructions WD-35653-01 pH 4.01 calibration buffer solution pouches, 20/box. WD-35653-02 pH 7.00 Calibration buffer solution pouches, 20/box. WD-35631-30 pH/CON 300 meter kit.
Factor Factor = Actual TDS ÷ Actual Conductivity @ 25°C ppm Value Definitions: Actual TDS: Value from the solution bottle label or as a standard you make using high purity water and precisely weighed salts. 0.9961 79,688 0.8970 13,455 0.8825 11,367 0.8478 0.7000 1050 7608 0.7078 1000 0.6712 300.0 0.6563 50.50 Factor Actual Conductivity: Value measured using a properly calibrated Conductivity/ Temperature meter.
14. Appendix 3: Calculating Temperature Coefficients To determine the temperature coefficient of your sample solution use this formula: CT2 - CT1 TC = 100 x _________________________ CT1(T2 - 25) - CT2(T1 - 25) TC = Temperature coefficient CT1 =Conductivity at Temp. 1 CT2 = Conductivity at Temp. 2 T1 = Temp. 1 25 = 25°C T2 = Temp. 2 NOTE: A controlled temperature water bath is ideal for this procedure. 1.
