Measumax 70-670 Installation manual

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Operation Manual
70-670 Hand Held Brix Refractometer
The Measumax 70-670 Refractometer comes complete with an additional feature of a built in calibration ad-
justing screw. The 70-670 is tted with a high resolution Brix scale and is developed for low concentration
readings. This range can measure the low concentration in fruit juice, soft drink, grape wine and most kinds
of beverage. It can also be used in Industry for testing of Oil uids such as Cutting uids and Lubricating oil.
Materials used in the Measumax 70-670 are carefully selected to bring out a quality results. With a robust
aluminum body and rubber grip, it will provide easy accurate measurements when used correctly.
Specications
Model Range Min. Division Accuracy
70-670 ATC 0-18% Brix 0.1% ±0.1%
Daylight Plate
Calibration Screw
Main Prism Assembly
Rubber Hand Grip
Eye Piece
Focus Adjustment
How to Use Your Refractometer
Calibrating: Hold the refractometer in the direction of good
natural light and look into the eyepiece and adjust the eye
peice until the graduated scale is in focus as shown in (Fig.1).
Now open the daylight plate (Fig.3) and place 2-3 drops of
clean distilled water or calibration liquid on the main prism.
Close the daylight plate so the water spreads evenly across
the entire surface of the prism without any air bubbles or dry
spots. Then wait 30 seconds to allow the sample to adjust to
the ambient temperature of the refractometer.
Now turn the adjusting calibration screw until the boundary
of the upper blue eld and the lower white eld meet exactly
at ZERO on the scale as shown in (Fig.2)
You are now ready to take readings of the liquid you want
to test.
Fig.2Fig.1
Fig.3

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Measuring The Coolant Concentration: it is best to clean
the instrument test area, both the daylight plate and the top of
the main prism assembly by using a soft damp cloth.
Then once the scale has been calibrated place 1 to 2 drops
of cutting uid onto the prism glass and close the plate cover
(Fig.4). If you are measuring the current concentration of a
sump it is recommended to ll a paper cup with the your used
cutting uid and let it sit for 10 minutes. Then poke a small
hole in the middle of the cup and use the stream of coolant to
take your sample. When you look through the refractometer
your reading is measured at the intersection of where the two
blue & white colours meet - example 3 Brix. (Fig.5)
Note! It is important to note that each coolant has its own
unique concentration readings. Coolant can have a different
refractometer reading of 9.2°Bx at 10% concentration (10:1)
while another coolant may have reading of 3.3°Bx at 10%
concentration (10:1)
Example: Coolant with a Refractometer Index of 2. Therefore
if the scale measures 3 on the Brix scale then we multiply this
gure by the index (2 x 3 Brix = 6) concentration ratio is 6:1
The advantage of checking coolant with a refractometer is
that it can also indicate when the coolant is dirty and old. This
is displayed as a fuzzy or blurred line where the top colour
meets the white bottom of the scale. Clean coolant will display
a sharp line. (Fig.6)
Automatic Temperature Compensation (ATC) System:
The Measumax 70-670 unit has an Automatic Temperature
Compensation system (ATC). Please note for best results the
ambient working temperature of the room should be 20°C
Warnings: Accurate measurements depends on properly
calibrating the refractometer and the temperature of the prism
should be the same as the test piece.
Do not immerse the instrument into liquids.
Clean the instrument after using
Fig.5
Fig.6
Fig.4