1. Overview This instruction manual provides the installation, operation, and maintenance instructions for the Ohaus® AquaSearcher™ AP50MM Portable Photometer. Please read this instruction manual carefully before installation and operation. AquaSearcher™ AP50MM multi-function portable Photometer is designed intuitively to provide fast, reliable colorimetric and turbidity measurements. Its rugged single- handed design makes it perfect for field applications and the carrying case holds all test accessories.
Any other type of use and operation beyond the limits of the technical specifications is considered as an unintended use without the written consent of Ohaus. This meter complies with current industry standards and recognized safety regulations; danger may occur during use. If this meter is not used in accordance with this instruction manual, the expected protections provided by the meter may be impaired.
EN-7 a-AP50MM 2. Installation and Startup The AP50MM is a multi-wavelength colorimeter. It provides colorimetric measurements at 7 LED wavelengths and nephelometric turbidity measurement using white LED and infrared LED as the excitation sources. The AP50MM is pre- calibrated for colorimetric measurements of analyses common in industrial water treatment and other water testing in the laboratory or in the field, such as chlorine, phosphate, iron, and copper.
EN-8 a-AP50MM 30727772 Cleaning brush pk/5 30727773 Cloth pk/4 30727774 Screwdriver pk/2 30727775 Micro USB cable pk/2 a-AP30 30727776 Cylinder 5mL pk/2 30744416 Briefcase AQUASEARHER 2.3. Battery Installation The AP50MM is powered by four AA-size alkaline batteries. Do not use rechargeable nickel cadmium (NiCad) batteries or any AA-size lithium batteries.
EN-9 a-AP50MM 2.4. Navigational Control Pad Figure 2 Control Pad The AP50MM navigational control pad consists of five keys as shown in Figure 2. • The left, right, up, and down keys are navigational keys that are used to select an icon, a button, or other items in various pages.
EN-10 a-AP50MM 2.8. Auto LCD Power Saving During a colorimetric method measurement, The AP50MM automatically turns LCD backlight off with no-key activity and continues the measurement with the LCD backlight off. The auto LCD power-off time can be set in SYS->System Set. Pressing any key will turn on the LCD backlight.
EN-11 a-AP50MM 3. Instrument operation 3.1. Main Page The AP50MM provides intuitive icon driven user operations. On the main page, four major feature groups illustrated as below: 2022/07/19 08:00 TURB COLOR Power ABSB Figure 3. Main Menu Detailed operation instructions can be found in the following chapters. Table 3 Feature Groups on Main Menu Title Description...
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EN-12 a-AP50MM The 16 mm tube adapter used for colorimetric methods using the 16 mm sample tube. The instruction to us the adapter is provided in section 6. The sample vial compartment can take in a 25 ml sample vial. The light shield cover is not required to be closed if the 25 ml sample via is used.
EN-13 a-AP50MM 3.3. Light Shield Cover The light shield cover shown in Figure 5. The light shield cover conveniently slid between the open and closed positions. The light shield cover is held firmly at the rest positions by permanent magnets. The light shield cover should be in the closed position during storage, transportation, and measurements, especially during the turbidity.
EN-14 a-AP50MM 4. Turbidity Measurement 4.1. Operation Follow the following steps to measure turbidity: Fill the 10 ml sample vial to above the 10 ml mark. Insert the sample vial to the sample vial compartment. Slide the light shield cover to the closed position. Press the TURB on the main page, then press the OK key, The AP50MM will start to measure the turbidity in the sample.
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EN-15 a-AP50MM 2022/07/19 08:00 Figure 7 Turbidity calibration for low range Press the Continue key to continue high range turbidity calibration. If high range turbidity calibration not required, press any keys to exit. (Figure 7) Fill the 10 ml sample vial to above 10 ml mark with the 100 or 200 NTU standard.
EN-17 a-AP50MM 5.3. Single Timing Step Method Most of colorimetric methods have only one timing step. As an example, in the DPD free chlorine method, it takes one minute for the DPD powder reagent to completely react with chlorine in the water sample. The DPD free chlorine method has a single one-minute timing step.
EN-18 a-AP50MM 5.5. Two-Vial Methods Some colorimetric methods require using two vials. The water sample is added to two identical vials. One vial is being used to zero the colorimeter, referred as to the prepared blank. A reagent is added to the other vial, referred as to the prepared sample. The absorbance value is determined from the prepared sample.
EN-19 a-AP50MM 5.6. Multiple Timing Steps Method Some colorimetric methods have two or three timing steps. The AP50MM shows a count-down timer for the timing steps before the last timing step (Figure 12). During these timing steps, one or more reagents are added to the sample, or operations such as swirling the vial to mix the reagent and the sample are being performed.
EN-20 a-AP50MM Optionally, The AP50MMcan be re-zeroed using the prepared blank after the timing step is completed or terminated. The blank reading will be subtracted from the measured concentration value, and the displayed concentration value on the top-right corner will be updated. This step is optional. It is only necessary if the prepared blank changes its color during the timing period.
EN-21 a-AP50MM directly measure bleach concentration in the range of 0 to 15%. No reagent is required for the method and the displayed result is the sodium hypochlorite concentration in percentage. Select BLCH in the method selection page and carry out the following steps: Place a vial filled with deionized water into the vial compartment and press the ZERO button to zero the AP50MM.
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EN-22 a-AP50MM CONFG button to launch the method configuration page. Press the slope calibration button SlpCal. A numeric keyboard will be displayed. Enter the concentration value and press the OK key on the enter key in the numeric keyboard to return to the configuration page. Press the EXIT button.
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EN-23 a-AP50MM 5.8.3. Reagent Blank Calibration Some methods have a non-zero intercept value in the calibration equation. For these methods, a proper non-zero intercept value is pre-loaded in the AP50MM prior to shipping. The following steps are used to carry out a reagent blank calibration: Follow the normal steps to carry out a measurement on a deionized water sample.
EN-24 a-AP50MM 6. Absorbance Measurement The following steps are used to measure the absorbance values of a sample: Press the ABS to launch the absorbance measurement page. Place a vial filled with the blank sample in the sample vial compartment. Press the ZERO button to zero the method.
EN-25 a-AP50MM Note that the absorbance values measured with the AP50MM is generally smaller than those measured with a spectrophotometer equipped with a monochromatic light source or detector. The AP50MM absorbance values should, however, linearly correlate with the absorbance values measured with the spectrophotometer. Thus, for any colorimetric system, The AP50MM absorbance follows Lambert-Beer law.
Deposits left behind when the water is evaporated could affect Ohaus performance. - Attention: Do not use solvents, harsh chemicals, ammonia or abrasive cleaning agents.
• If you need help in the United States, please call toll-free 1-800-526-0659 between 8:00 am and 5:00 pm (USA Eastern Standard Time). • If you need help outside the United States, please visit the Ohaus website www.ohaus.com to find the nearest Ohaus office.
Dimensions (L x W x H) 265 × 88 × 69mm Net Weight {imp.} 1.32 lbs (Basic unit) Net Weight {metric} 600g (Basic unit) Altitude: 2000m Pollution degree: Note:1. Specifications are subject to change without notice with Ohaus’ continuous development.
This product complies with the EU Directive 2012/19/EU (WEEE). Please dispose of this product in accordance with local regulations at the collecting point specified for electrical and electronic equipment. For disposal instructions in Europe, refer to www.ohaus.com/weee. EN 61326-1 ISED Canada Compliance Statement: CAN ICES-003(A) / NMB-003(A)
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Trade Name: OHAUS CORPORATION Model: a-AP50MM Party issuing Supplier’s Declaration of Conformity: Ohaus Instruments (Changzhou) Co., Ltd. Building C, No. 6 Zhengqiang Road, Xuejia Town, Xinbei District, Changzhou Jiangsu 213022, China Phone: +86 519 85287270 Responsible Party – U.S. Contact Information:...
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