Extech Instruments RF40 Manual de usuario
User's Guide
Battery/Coolant Refractometer with ATC
Model RF40
Introduction
Congratulations on the purchase of your RF40 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.
RF40 V1.2 4/04
2
-60(63%)
-50(60%)
-40(57%)
-30(53%)
-20(49%)
-10(44%)
-5(41%)
+0(38%)
+5(34%)
+10(30%)
+15(25%)
+20(19%)
+25(12%)
FPROPYLENE
GLYCOL
-60(59%)
-50(56%)
-40(52%)
-30(48%)
-20(44%)
-10(39%)
-5(36%)
+0(33%)
+5(29%)
+10(25%)
+15(21%)
+20(16%)
+25(10%)
ETHYLENE
GLYCOL WATERLINE
F
1.30
1.25
1.20
1.15
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and
workmanship for one year from date of shipment (a six month limited warranty applies on sensors and
cables). If it should become necessary to return the instrument for service during or beyond the warranty
period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our
website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA
number). A Return Authorization (RA) number must be issuedbefore any product is returned to Extech. The
sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in
transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper
wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification.
Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and
will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited
to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty,
whether written or oral, is expressed or implied.
Specifications
Range -60 to 32°F Propylene and ethylene glycol freeze point
1.15 to 1.30 specific gravity of battery acid
Resolution 10°F glycol freeze point; 0.01 specific gravity of battery acid
Dimensions 6.5x1.5x1.5" (165x38x38mm)
Weight 7.0 oz. (200g)
Description
1. Prism
2. Cover Plate
3. Adjustment Screw
4. Mirror Tube
5. Eyepiece
1 2 3 4 5
RF40 V1.2 4/04
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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.
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 68°F
(20°C), readings are automatically adjusted to compensate for temperature variance
between 50°F to 86°F (10°C to 30°C).
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.
Bad Bad Good
RF40 V1.2 4/04
4
Support Hotline (781) 890-7440
Website: www.extech.com
Calibration and Repair Services
Extech offers complete repair and calibration services for all of the products we sell. For
periodic calibration or repair of this Extech product, call customer service for details on
services available. Extech recommends that calibration be performed on an annual basis to
ensure calibration integrity.
Copyright © 2002 Extech Instruments Corporation. All rights reserved
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