Extech RF40 Manual

Extech Måling RF40

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Side 1/3

User's Guide

Battery/Coolant Refractometer with ATC

Model RF40-C

Introduction

Congratulations on the purchase of your RF40-C Battery/Coolant

Refractometer with automatic temperature compensation. This

precision optical instrument should be handled gently; avoid touching

the optical surface. Careful use of this instrument will provide years of

reliable service.

Description

1. Eyepiece

2. Mirror tube

3. Adjustment Screw

4. Cover plate

5. Prism

Field of View

www.extech.com

Version 1.0 March 2006

Operation

The instrument measures the refractive index of the sample.

1. Zero Adjustment

Place one or two drops of distilled water on the prism. Close the cover

plate and rotate the adjusting screw so that the light/dark boundary lines

up with the “waterline”. Once the zero adjustment has been completed,

clean the prism with soft cloth

2. Sample Preparation and Reading

To take a sample reading, simply

place a few drops of a sample liquid

on the measurement prism at the

end of the instrument. Lower the

cover plate onto the sample and

prism. Open the prism cover and

place 2 or 3 drops on the prism.

Close the cover so the liquid spreads

across the entire surface of the prism

without air bubbles or dry spots.

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 freezing point of the liquid or the state of the battery liquid

is determined by the intersection of the boundary of the light and dark

fields (known as the shadowline) on the printed scale. 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 shadowline. Under normal conditions,

optimal contrast is obtained by holding the instrument underneath and

perpendicular to a light source.

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 one of the single most important factors influencing

accurate refractometer readings and is one of the largest sources of

error in measurement. Temperature compensation relieves the user of

the responsibility to measure temperature and apply a correction factor

when taking readings. This refractometer makes this correction

automatically. When ambient temperature varies from 20°C (68°F),

readings are automatically adjusted to compensate for temperature

variance between 10°C to 30°C (50°F to 86°F).

Specifications

Range -51 to 0°C (-60 to 32°F) for propylene and

ethylene glycol freeze point

1.10 to 1.40 specific gravity of battery acid

Resolution 1°C/2°F glycol freeze point

0.01 specific gravity of battery acid

Dimensions 6.5x1.5x1.5" (165x38x38mm)

Weight 7.0 oz. (200g)

Produkt Specifikationer

Mærke:	Extech
Kategori:	Måling
Model:	RF40

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