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.
Description
1. Eyepiece
2. Mirror tube
3. Adjustment Screw
4. Cover plate
5. Prism
Field of View
-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
F
1.15
WATERLINE
1.30
1.25
1.20
-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%)
F PROPYLENE
GLYCOL
Operation Specifications
The instrument measures the refractive index of the sample.
Range -60 to 32°F for Propylene and
1. Zero Adjustment
ethylene glycol freeze point
1.15 to 1.30 specific gravity of battery acid
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
Resolution 10°F glycol freeze point
0.01 specific gravity of battery acid
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.
Weight 7.0 oz. (200g)
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.
While holding the instrument under a light source, look through the eyepiece. The Bad Bad Good 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.
99 Washington Street
Melrose, MA 02176
Phone
781-665-
1400
Toll Free 1-800-517-8431
Visit us at www.T
estEquipmentDepot.com
Back to the Extech FR40 Product Info Page
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.
Support line (781) 890-7440
Technical support: Extension 200; E-mail: [email protected]
Repair & Returns: Extension 210; E-mail: [email protected]
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
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451 temperature variance between 50°F to 86°F (10°C to
30°C).
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
