MW12 Digital Phosphate Tester User Manual

Specifications

Range	0.00 to 2.50 ppm
Resolution	0.01 ppm
Accuracy	±0.04 ppm ±4% of reading @ 25 °C
Typical EMC Dev.	±0.01 ppm
Light Source	Light Emitting Diode @ 525 nm
Light Detector	Silicon Photocell
Method	Adaptation of the Standard Methods for the Examination of Water and Wastewater, 20th edition, Ascorbic Acid method. The reaction between phosphate and the reagent causes a blue tint in the sample.
Environment	0 to 50°C (32 to 122 °F) max. 95% RH non-condensing
Battery Type	1 x 1.5V AAA
Auto-Shut Off	After 10 minutes of non-use and 2 minutes after reading
Dimensions	81.5 x 61.0 x 37.5 mm (3.2 x 2.4 x 1.5")
Weight	64 g (2.25 oz.)

Certification & Compliance

Milwaukee Instruments conform to the CE European Directives.

Disposal of Electrical & Electronic Equipment: Do not treat this product as household waste. Hand it over to the appropriate collection point for the recycling of electrical and electronic equipment. ♻️

Disposal of waste batteries: This product contains batteries. Do not dispose of them with other household waste. Hand them over to the appropriate collection point for recycling. Please note: proper product and battery disposal prevents potential negative consequences for human health and the environment. For detailed information, contact your local household waste disposal service or go to www.milwaukeeinstruments.com (USA & CAN) or www.milwaukeeinstruments.eu.

The product is CE and RoHS compliant.

Recommendation

Before using this product, ensure it is entirely suitable for your specific application and environment. Any modification introduced by the user may compromise the tester's performance. For your and the tester's safety, do not use or store the tester in a hazardous environment. To avoid damage or burns, do not perform any measurement in microwave ovens.

Warranty

This tester is warranted against defects in materials and manufacturing for a period of 2 years from the date of purchase. This warranty is limited to repair or free of charge replacement if the tester cannot be repaired. Damage due to accidents, misuse, tampering, or lack of prescribed maintenance is not covered by warranty. If service is required, contact your local Milwaukee Instruments Technical Service. If the repair is not covered by the warranty, you will be notified of the charges incurred. When shipping any tester, ensure it is properly packaged for complete protection.

Milwaukee Instruments reserves the right to make improvements in design, construction, and appearance of its products without advance notice.

Optional Accessories

Reagent Sets

MI512-25: Phosphate powder reagent, 25 pcs.

Other Accessories

MI0011: Glass cuvettes (2 pcs.)
MI0013: Stoppers for cuvettes (2 pcs.)

Preliminary Examination

Thank you for choosing Milwaukee Instruments! Remove the tester and accessories from the packing and examine it carefully. For further support, please contact your closest Milwaukee Instruments office.

Each MW12 tester is supplied complete with:

Sample cuvette and cap (2 pcs.)
Phosphate Low Range powder reagents (6 tests)
1 x 1.5V AAA Battery
Instruction manual

Functional Description

The MW12 tester has the following components:

Dust cover
Cuvette with cap
Cuvette holder
Liquid Crystal Display
On/Off button

Diagram showing the MW12 tester with numbered components: 1. Dust cover, 2. Cuvette with cap, 3. Cuvette holder, 4. Liquid Crystal Display, 5. On/Off button.

Operation

To operate the tester:

Press the On/Off button to turn the tester on. All segments are displayed for a few seconds, followed by "Add", "C1" with "Press" blinking.
Fill the cuvette with 10 mL of unreacted sample and replace the cap. Place the cuvette into the tester and close the cap.

Illustration shows filling a cuvette with 10 mL of liquid and placing it into the tester.

Press the On/Off button. The display shows "Add", "C.2" with "Press" blinking, indicating the tester is zeroed.
Remove the cuvette, unscrew the cap, and add the content of one packet of MI512-0 reagent. Replace the cap and shake gently for 2 minutes until the powder is completely dissolved. Replace the cuvette into the tester.

Illustration shows adding reagent powder to the cuvette, capping, and shaking.

Press and hold the On/Off button. The display will show the countdown prior to the measurement. Alternatively, wait 3 minutes and press the On/Off button.

Illustration shows a countdown timer display, e.g., '3:00'.

When the timer ends, the tester will perform the reading. The tester directly displays the concentration of phosphate in ppm.

Illustration shows the tester's display reading '1.52' ppm Phosphate.

The tester automatically turns off 2 minutes after reading.

Battery Replacement

To save the battery, the tester shuts down after 10 minutes of non-use and 2 minutes after reading. A fresh battery lasts for a minimum of 5000 measurements, depending on the light level.

When the battery capacity is under 10%, the tester displays "bAt" at start up. When the battery is drained, the tester displays "bAd" then "bAt" message. Replace the battery with a new one and restart the tester.

To replace the battery, follow these steps:

Press the On/Off button to turn the tester off.
Turn the tester upside down and use a screwdriver to unfasten the screw and remove the battery cover.
Remove the old battery and replace it with a fresh 1.5V AAA battery, inserting the negative end first. ?
Replace the battery cover, fasten, and tighten the screw.

Diagram illustrating the battery replacement process: unscrewing the cover, replacing the AAA battery, and reattaching the cover.