Extech RF30 Handleiding

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RF30-en-US_V1.2 3/15

User's Guide

0 to 90% Brix Refractometer

Model RF30

Introduction

Congratulations on your purchase of the Extech RF30 Brix Refractometer.

Precision optical instruments should be handled gently; avoid touching the

optical surface. Careful use of these instruments will provide years of

reliable service.

Specifications

Range 0 to 90% Brix in three scales:

1: (0 to 42%), 2: (42 to 71%),

3: (71 to 90%)

Resolution 0.2%

Dimensions 7.5 x 1.6 x 1.2" (190 x 40 x 30mm);

Weight 5.5 oz. (155g)

Description

1. Cover plate

2. Light window

3. Prism

4. Sharpness ring

5. Eyepiece and Focus

6. Light window

7. Scale select knob

Scale:

Operation

This instrument measures the refractive index of a sample. The measurement

is displayed in % Brix.

1.The 20ºC zero calibration is factory set. No further adjustment is

necessary.

2.Select the scale (1, 2 or 3) by rotating the scale select knob.

3.To take a sample reading, open the cover plate, place a few drops of the

sample (a vial of distilled water is

included) on the measurement

prism. Close the prism cover plate

so that 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.

4.While holding the instrument under

a light source, look through the

eyepiece. Rotate the eyepiece to adjust the focus

5.The sucrose concentration is determined by the intersection of the

boundary of the light and dark fields (known as the shadowline) on the

printed scale. Adjustment of the sharpness ring can improve the

shadowline definition.

6.It may be necessary to adjust the position of the light source to maximize

the contrast of the shadowline. The light window may also be opened or

closed to improve contrast.

7.Change the range if the line is offscale.

8.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 Compensation

The RF30 Refractometer has been designed for use with a 20°C standard

temperature. If the temperature of the measurement deviates from 20°C, the

reading must be manually compensated in accordance with the Temperature

Compensation Table.

Example: Reading = 20%, Temperature = 28°C

20% + 0.62% (add from table) =20.62%.

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Temperature Compensation Table (Referenced To 20

O

C)

%

0 5 10 15 20 25 30 35 40

o

C Subtract from the measured value

10 0.52 0.58 0.59 0.61 0.64 0.67 0.69 0.71 0.72

11 0.48 0.51 0.54 0.55 0.58 0.61 0.63 0.65 0.65

12 0.44 0.47 0.49 0.50 0.52 0.55 0.57 0.58 0.58

13 0.39 0.42 0.44 0.44 0.45 0.49 0.50 0.51 0.51

14 0.35 0.37 0.38 0.39 0.40 0.42 0.43 0.44 0.44

150.29 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.37

160.24 0.25 0.26 0.27 0.28 0.28 0.29 0.30 0.30

170.18 0.19 0.20 ‘0.20 0.21 0.21 0.22 0.22 0.23

180.12 0.13 0.13 0.14 0.14 0.14 0.15 0.15 0.15

190.06 0.06 0.07 0.07 0.07 0.07 0.07 0.08 0.08

Add to the measured value

210.06 0.07 0.07 0.07 0.07 0.07 0.08 0.08 0.08

220.13 0.14 0.14 0.14 0.14 0.15 0.15 0.16 0.16

230.20 0.21 0.21 0.22 0.22 0.23 0.23 0.23 0.23

240.27 0.28 0.29 0.29 0.30 0.30 0.31 0.31 0.31

250.34 0.35 0.36 0.37 0.38 0.38 0.39 0.39 0.40

260.42 0.43 0.44 0.44 0.46 0.46 0.47 0.47 0.48

270.50 0.51 0.52 0.53 0.54 0.55 0.55 0.56 0.56

280.58 0.59 0.60 0.61 0.62 0.63 0.64 0.64 0.65

290.66 0.67 0.68 0.69 0.70 0.71 0.72 0.73 0.73

300.74 0.75 0.77 0.78 0.79 '0.80 '0.81 0.81 0.81

%

45 50 55 60 65 70 75 80 85

o

C Subtract from the measured value

10 0.74 0.74 0.74 0.75 0.76 0.77 ---- ---- ----

11 0.67 0.67 0.67 0.68 0.68 0.69 ---- ---- ----

12 0.60 0.60 0.60 0.60 0.61 0.61 ---- ---- ----

13 0.53 0.53 0.53 0.53 0.53 0.53 ---- ---- ----

14 0.45 0.45 0.45 0.45 0.45 0.46 ---- ---- ----

150.38 0.38 0.38 0.38 0.38 0.38 0.38 0.37 0.07

160.30 0.31 0.31 0.31 0.31 0.31 0.30 0.30 0.30

170.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.22

180.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15

190.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.07

Add to the measured value

210.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.07

220.16 0.16 0.16 0.16 0.16 0.15 0.15 0.15 0.15

230.24 0.24 0.24 0.24 0.23 0.22 0.23 0.23 0.22

240.31 0.31 0.32 0.32 0.31 0.31 0.31 0.30 0.30

250.40 0.40 0.40 0.40 0.39 0.39 0.39 0.38 0.37

260.48 0.48 0.48 0.48 0.47 0.47 0.46 0.46 0.45

270.56 0.56 0.56 0.56 0.55 0.55 0.54 0.53 0.52

280.65 0.64 0.64 0.64 0.64 0.63 0.62 0.61 0.60

290.73 0.73 0.73 0.72 0.72 0.71 0.70 0.69 0.68

300.82 0.81 0.81 0.81 0.80 0.79 0.78 0.77 0.75

Warranty

FLIRSystems,Inc.warrantsthisExtechInstrumentsbranddevicetobefreeofdefectsinparts

anddateworkmanshipforfromoneyearof(amonthshipmentsixlimitedwarrantyappliesto

sensorsandcables).becomeIfitshouldnecessarytothereturninstrumentforserviceduringor

beyondcontactthewarrantyperiod,theCustomerServiceDepartmentforauthorization.Visit

thewebsitewww.extech.comforcontactinformation.AReturnAuthorization(RA)mustnumber

beanyfreight,issuedbeforeproductisisreturned.Thesenderresponsibleforshippingcharges,

insuranceandproperpackagingtotopreventdamagedoesnotintransit.Thiswarrantyapply

defectsactionasresultingfromoftheusersuchmisuse,improperwiring,ofoperationoutside

specification,impropermaintenanceororrepair,unauthorizedmodification.FLIRSystems,Inc.

specificallydisclaimsanyforimpliedwarrantiesorormerchantabilityfitnessaspecificpurpose

andbeanywillnotliablefordirect,indirect,incidentalor

consequentialdamages.FLIR’stotal

liabilityisislimitedtorepairorofreplacementtheproduct.Thewarrantysetforthabove

inclusiveandnootherwarranty,whetherwrittenorororal,isexpressedimplied.

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