Milwaukee MR100ATC Manuel utilisateur

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MR100ATC - Salinity Refractometer

Specifications

Scale Range Resolution

Parts Per Thousand 0 to 100 0/00 1 0/00

Specific Gravity 1.000 to 1.070

Dimensions 7.6 x 1.5 x 1.5" (194 x 38 x 38mm)

Weight Approx. 8.0 oz. (227g)

Shadow-line Æ

Operation

The instrument measures the refractive index of the sample and displays the result in parts

per thousand ( 0/00 ) and specific gravity.

1. Zero Adjustment

Put distilled water on the prism; enough to cover the entire prism. Close the cover plate and rotate

the adjusting screw so that the light/dark boundary line (known as the shadow-line) evens up with

the zero line. After the zero adjustment, clean the prism with soft cloth.

2. Sample Preparation and Reading

To take a reading, place a few drops of a sample liquid on the measurement prism. Ensure that

enough solution is added to the prism in order to cover the entire prism. Close the prism so that

the liquid spreads across the entire surface of the prism without air bubbles or dry spots (see

diagrams below). Allow the sample to remain on the prism for approximately 30 seconds. While

holding the instrument under a light source, look through the eyepiece. The salinity concentration

is determined by the intersection of the boundary of the light and dark fields (known as the

shadow-line) on the printed scale. The left side of the scale indicates the specific gravity and the

right side parts per thousand. If the scale appears out of focus, the eyepiece may be adjusted by

rotating the knurled portion. The instrument also features an eye guard to prevent stray light from

entering the eyepiece and causing reflections. It may be necessary to adjust the position of the

light source to maximize the contrast of the shadow-line. Under normal conditions, optimal

contrast is obtained by holding the instrument underneath and perpendicular to a light source.

(florescent light is not recommended) - Once a reading has been taken, wipe dry with a clean

cloth (do not wash or rinse) and place the instrument in the supplied plastic case. Store the

instrument in a safe, dry environment.

Temperature is the single most important factor influencing refractometer readings and is one of

the largest sources of measurement error. However, this device incorporates automatic

temperature compensation (ATC) and the concern for temperature fluctuations in sample

liquids is alleviated. When ambient temperature varies from 68°F (20°C), readings are

automatically adjusted to compensate for temperature variance between 50°F to 86°F (10°C to

30°C).

Liquid on lens display

Milwaukee Instruments

2950 Business Park Drive

Rocky Mount, NC 27804

Ph # 252-443-3630 e-mail sales@milwaukeetesters.com

www.milwaukeetesters.com