User manual EUTECH INSTRUMENTS WATERPROOF CYBERSCAN DO 300 DISSOLVED OXYGEN METER

[. . . ] Instruction Manual DO 300 Waterproof Hand-held Dissolved Oxygen / Temperature Meter 68X248909 Technology Made Easy . . . Rev 3 02/04 Preface This manual serves to explain the use of the Waterproof DO 300 hand-held meter. It functions in two ways, firstly as a step by step guide to help you to operate the meter. It is written to cover as many anticipated applications of the Waterproof DO 300 meter as possible. If there are doubts in the use of the meter, please do not hesitate to contact the nearest Authorised Distributor. [. . . ] In mg/L (ppm) SETUP mode: Calibration information is shown in mg/L (ppm) units. Press the MODE key to select the calibration data you want to view: % or mg/L (ppm). If you want to return to measurement mode, press CAL/MEAS. Figure 21: View calibration data or MR/ keys to scroll through main groups until you view parameter "CAL" in the upper NOTE: If you did not calibrate this meter in a particular mode, the screen will show " ---". See Figure 22. (The values shown above are for illustration purpose. Your meter may display different values depending on the settings & your environmental conditions) Figure 22: Meter is not calibrated 25 Instruction Manual DO 300 8. 6 ELE: Electrode Properties Checking electrode data from % saturation SETUP mode These "view only" parameters show you the electrode properties for diagnostic purposes: A. Probe Slope: Lets you view and give an indication of the probe's efficiency. The value displayed is the ratio of the theoretical value to the actual value produced by the probe. % Saturation Offset: (available in % saturation SETUP mode only): Lets you see the value of the % saturation offset entered in parameter "OFS" (see page 24 for instructions). 100% Saturation mV value: Lets you view the sensor's mV output corresponding to 100% saturation. 0% Saturation mV Value: Lets you view the sensor's millivolt output corresponding to 0% saturation. SETUP ee l p 50 . ER ENT SETUP K= . 4 98 e1 l % ER ENT SETUP 76 . From measurement mode: 1. Press the MODE key to select the measurement mode for the electrode properties you want to view: % or mg/L (ppm). SETUP ER ENT % EL 2 2. 92 EL 3 ER ENT mV you view parameter "ELE" in the upper display. The upper display shows the probe slope. SETUP 5. Press the ENTER key. NOTE: This % saturation slope and offset appears only in % saturation SETUP mode. If you are in mg/L (ppm) SETUP mode, the meter skips step 4 and 5 to show step 6 on page 27. - 01 . EL 4 mV Figure 23: View electrode properties from % saturation SETUP mode 26 Instruction Manual DO 300 6. Press the ENTER key. The upper display shows the 100% saturation mV value. Checking electrode data from mg/L (ppm) SETUP mode 7. Press the ENTER key. The upper display shows the 0% saturation mV value. SETUP 8. Press the ENTER key to move back to main group "ELE". If you want to return to measurement mode, press CAL/MEAS. ee l p 40 . ER ENT SETUP K= 10 0 . 0 e1 l mg/l ER ENT SETUP mV 39. 2 EL 2 ER ENT SETUP - 01 . EL 3 mV Figure 24: View electrode properties from mg/L (ppm) SETUP mode (The values shown above are for illustration purpose. Your meter may display different values depending on the settings & your environmental conditions) 27 Instruction Manual DO 300 8. 7 COF: Unit Configuration Unit configuration mode lets you select the following parameters: A. mg/L or ppm units (available from mg/L or ppm SETUP mode only) Temperature in °C or °F. Figure 25: Unit configuration from % saturation SETUP mode Figure 26: Unit configuration from mg/L (ppm) SETUP mode 28 Instruction Manual DO 300 8. 7. 1 READY Indicator and Auto Endpoint Function The first program lets you select: · "READY indicator ON" to indicate when the reading is stable. · · "READY indicator OFF" for faster meter response. Select auto endpoint ON to "HOLD" the reading when it is stable for more than 5 seconds. [. . . ] There are two main sources of DO in water: from atmosphere and photosynthesis. Waves and tumbling water mix air into the water where oxygen readily dissolves until saturation occurs. Oxygen is also produced by aquatic plants and algae as a by-product of photosynthesis. The amount of DO that can be held by water depends on 3 factors: water temperature, salinity, and atmospheric pressure. [. . . ]