RS PRO 1389 User manual

Internal
Instruction Manual
RS-1389
210-7487
BRIX METER

BRIX METER / EN
05/24/18 Version No. 00
CONTENTS
Title Page
1. INFORMATION .......................................................................1
2. FEATURES .............................................................................2
3. SPECIFICATIONS ..................................................................3
4. NAME OF PARTS AND POSITIONS...................................... 4
4-1 Description of Parts & Control keys................................4
4-2 Description of Display.....................................................7
5. OPERATING INSTRUCTIONS ............................................. 8
5-1 Precautions.....................................................................8
5-2 Zero Point Calibration.....................................................8
5-3 Measurement on Sample ...............................................9
5-4 Changing Temperature Unit °C
 °F.......................... 10
5-5 Setting Real-Time........................................................ 10
5-6 Data Memory and Read Mode.....................................11
5-7 LCD Backlight Function............................................... 12
5-8 Alarm Function Operation............................................ 12
6. EXPLANATION OF ERROR MESSAGES ........................ 14
7. BATTERY CHECK-UP & REPLACEMENT ...................... 17
8. MAINTENANCE .................................................................. 17
9. BRIX TO REFRATIVE INDEX (ND) CONVERSION TABLE 18

BRIX METER / EN
02/24/21 Version No. 00 1
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1. INFORMATION
 The meter is a portable optical meter that uses the
measurement of refractive index to determine the % Brix of
sugar in aqueous solutions.
 The measurement technique and temperature compensation
use methodology recommended by ICUMSA (International
Commission of Uniform Method of Sugar Analysis).
 The meter is a waterproof brix meter with a rating of IP65 and
has a memory of 99 data points that can later be read by the
meter.
 Prior to working with the meter all operators should read this
manual carefully, which will help you to operate and maintain
the meter, as well as to avoid damage caused by unsuitable
operation and maintenance.
※
Protected by:
Taiwan: D195768
China: ZL 2018 30275110.8
U.S.A.: US D861,523

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2. FEATURES
 Wide measuring range (Brix 0 ~ 53%)
 Refractive index measurement (RI)
 Temperature measurement (°C/°F)
 Ambient temperature compensation (ATC)
 Brix or RI high/low limit value alarm function
 Zero calibration with distilled or deionized water
 Friendly operation and easy to use
 Wide and dual display LCD and backlight function
 Reliable water resistant (IP65)
 Data memory and read function (99 sets)
 Auto power off after 2 minutes of non-use
APPLICATIONS
 Food industry: Beverages, fruits and sweets
 Industry: Monitoring of lubricants in machines and quality
control
 Agriculture: Determination of the degree of ripeness of fruit for
quality control in harvesting

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3. SPECIFICATIONS
 Sensor : Photodiode arrays
 Measuring Function : Brix (%)
Temperature (°C/°F)
Refractive index (RI)
 Brix Range : 0.0 ~ 53.0%
(10 ~ 40°C/50 ~ 104°F Automatic temperature
compensation)
 RI Range : 1.3329 ~ 1.4265
 Temperature Range : 4 ~ 60°C (39.2~140°F)
 Accuracy (Water at 23°C /73.4°F) : Brix: ±0.2%
Temperature: ±1°C/°F
RI: ±0.0003
 Resolution: Brix: 0.1%
Temperature: 0.1°C/°F
RI: 0.0001
 Data memory Capacity : 99 sets.
(Direct reading from LCD display)
 Operation Temperature Range : 10~40°C (50 ~ 104°F),
Less than 85%RH
 Store Temperature Range : 0~50°C (32 ~ 122°F),
Less than 85%RH
 Response Time : 3 seconds
 International Protection Class : IP65 water resistant
 Battery : AAA batteries x 4
 Size : 148mm x 78mm x 50mm
 Weight : Approx. 250g
 Accessories : Instruction manual, Battery, One sample vial,
Two transfer plastic pipettes.

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4. NAME OF PARTS AND POSITIONS
4-1 Description of Parts & Control keys
UNIT
MEM
SET
ZERO
READ FUNC
TEST
A.I.Alert
1. LCD Display : Dual display LCD is used for reporting the
measurement Brix (%), Refractive index (RI),
Temperature values and has several other marks
to provide function guidance.

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2. ◄ MEM READ key :
◄ key : In the setting mode, press ◄key to move flicking cursor
to desired position.
MEM key : After measurement, press “ MEM ” key to store the
measured Brix (%), Refractive index (RI),
Temperature (°C or °F) values and the memorized
time (RTC) to memory.
READ key : Press and hold down the “ SET ” key then press
“ READ ” key to enter the memory data reading
mode.
Press “ READ ” key again to exit this mode.
3. ▲ UNIT A.I.Alert key :
▲ key : In the setting mode, press ▲key to change the desired
parameter or increase the displayed setting value.
In the read mode, press ▲key to increase the
memorized address number.
UNIT key : Press “ UNIT ” key to change the Brix % to RI unit or
RI to Brix % unit.
A.I.Alert key : Press and hold down the “ SET ” key then press
“ A.I.Alert ” key to enter or exit Brix % or Refractive
index (RI) the high/low limit value alarm function.
4. key : Press key to turn on or off the meter
5. TEST ▼ ZERO ke y:
TEST key : Press “ TEST ” key to perform the single-shot
measurements.
▼ key : In the setting mode, press ▼key to change the desired
parameter or decrease the displayed setting value.
In the read mode, press ▼key to decrease the
memorized address number.

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ZERO ke y: Press and hold down the “ SET ” key then press
“ ZERO ” key to perform the zero-calibration function.
6. SET key :
key : In the setting mode, press key to confirm the setting
item or stored the setting values.
SET key : Press and hold down the “ SET ” key then press
“ READ ” key to enter the memory data reading mode.
Press and hold down the “ SET ” key then press
“ A.I.Alert ” key to enter or exit Brix % and Refractive
index (RI) the high/low limit value alarm function.
Press and hold down the “ SET ” key then press
“ ZERO ” key to perform the zero-calibration function.
Press and hold down the “ SET ” key then press
“ FUNC ” key to enter the setting mode.
7 FUNC key :
key : Press key to turn the LCD backlight function on or
off.
FUNC key : Press and hold down the “ SET ” key then press
“ FUNC ” key to enter the setting mode.
Press “ FUNC ” key again to exit setting mode.
8. Prism
9. Sample plate
10. Cover

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4-2 Description of Display
: Measurement in progress indication.
: Brix % and RI high/low limit value alarm function indication.
RI : Refractive index reading indication.
% : Brix % reading indication.
CAL : Zero calibration indication.
ATC : Automatic temperature compensation indication.
: Manual memory address number indication.
: Read mode indication.
: Recall manual memory address number indication.
▲: Alarm high limit indication.
▼: Alarm low limit indication.
°C, °F : Temperature units.
: Setting mode indication.
: Battery capacity indication.

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5. OPERATING INSTRUCTIONS
5-1 Precautions
 Handle the meter carefully. Do not drop or shake the meter.
 The meter is used to measure sugar solutions. Do not
expose the meter or prism to solvents that will damage it.
This includes most organic solvents and extremely hot or
cold solutions.
 Never submerge the meter and do not spray water on the
meter except the sample plate located over the prism.
 Sample matter may scratch the prism. Absorb sample with a soft
tissue and rinse sample plate and prism with distilled water or
deionized water between samples and wipe dry.
 Use plastic pipettes to transfer the solutions. Do not use
metallic tools such as spoons, tweezers or needles as these
will scratch the prism.
 If a film develops on the prism will repel test samples and
affect the measured recording. If this occurs, clean with a
mild detergent.
5-2 Zero Point Calibration
Zero-point Calibration should be performed daily, before sample
testing begins, between a long series of measurements or when
you suspect that the reading may be inaccurate.
1. Press key to turn on the meter.
2. Press “ UNIT ” key to select Brix % reading the “ % ” symbol is
displayed.
3. Open the sample plate cover. Wipe and clean the prism
surface.

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4. Using plastic pipettes, drip a few drops of distilled or
deionized water on the prism, make sure that water covers
the prism surface completely.
5. Close the sample plate cover.
6. Press and hold down the “ SET ” key then press “ ZERO ” key
to enter the zero-calibration mode, the “ CAL ” symbol
is displayed. When the “0.0 %” reading is displayed means
the meter is calibrated.
7. Gently absorb the sample water with a soft tissue. Take care
not to scratch the prism surface. Wipe the surface completely.
The meter is ready for sample measurement.
5-3 Measurement on Sample
1. Press key to turn on the meter.
2. Open the sample plate cover. Wipe and clean the prism
surface.
3. Using plastic pipettes, drip a few drops of sample on the
prism, make sure that sample covers the prism surface
completely. If the temperature of the sample differs
significantly from the temperature of the meter, wait
approximately 1 minute to allow thermal equilibration.
4. Close the sample plate cover.
5. Press “ TEST ” key, the measurement in progress symbol “ ”
blinking three times then the measured value is displayed in
units of % Brix.
6. Press “ UNIT ” key to cycle displayed the measured % Brix or
RI (refractive index) values.
If the temperature exceeds the 10~40°C/50~104°F range,
the “ ATC ” symbol blinks and automatic temperature
compensation is disabled.

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7. Press “ MEM ” key to store the measured values and the RTC
to memory. Only one measurement can store at one time.
8. Remove sample from the sample plate by absorbing with a
soft tissue.
9. Using plastic pipettes, rinse prism and sample plate with
distilled or deionized water then wiper dry.
The meter is ready for the next sample.
5-4 Changing Temperature Unit °C  °F
1. Press key to turn on the meter.
2. Press and hold down the “ SET ” key then press “ FUNC ” key
to enter the setting mode, the “ ” symbol is
displayed.
3. Press key to enter the temperature unit setting mode.
4. Press ▲or ▼key to select the desired temperature unit °C or °F.
5. Press key to store the setting and exit setting mode.
5-5 Setting Real-Time
1. Press key to turn on the meter.
2. Press and hold down the “ SET ” key then press “ FUNC ” key
to enter the setting mode, the “ ” symbol is
displayed.
3. Press ▲key two times to select the RTC setting mode, the “
” symbol is displayed then press key to enter the
RTC setting mode.
4. Press ▲or ▼key to select the desired “year l month l day ” or
“hour:minute:second” setting mode.

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5. Press key to confirm the selection.
6. Press ◄key to move the blinking cursor to the desired position
then press ▲or ▼key to set the element to real-time. Repeat
this step to all element.
7. Press key to store the setting and exit this mode.
5-6 Data Memory and Read Mode
5-6-1 To Memorize the Reading
1. After each measurement, Press “ MEM ” key to store the
measured reading and the RTC to memory. At this moment,
LCD will show the “ ” symbol and the memory address
number. Total memory size is 99 sets.
2. When the memory is full, the “ ” symbol is display one
time.
5-6-2 To Recall and Read Memorized Reading
1. Press and hold down the “ SET ” key then press “ READ ” key
to enter the memory data reading mode, the “ ” symbol and
the memory address number is displayed. If no data stored in
the memory the “ ” symbol is display one time.
2. Press ▲or ▼key to select the desired memory address
number data for display.
year

month

hour

minute


day

second

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3. Press “ FUNC ” key to cycle display the Brix %, RI reading and
the memorized RTC.
4. Press “ READ ” key again to exit this mode.
5-6-3 To Clear the Memorized Data
1. Press key to turn off the meter.
2. Press and hold down the “ MEM ” key then press key to
turn on the meter, LCD will show “ ” symbol one
time, it indicated that the memorized data is erased, the “
” symbol is displayed.
5-7 LCD Backlight Function
In the measurement mode, except in the setting mode and
memory data read mode, press key to turn the LCD
backlight function on or off.
5-8 Alarm Function Operation
5-8-1 To Set the Alarm Limit Values
1. Press key to turn on the meter.
2. Press and hold down the “SET” key then press “FUNC” key to
enter the setting mode, the “ ” symbol is displayed.
3. Press ▲ key one time to select the alarm limit values setting
mode, the “ ” symbol is displayed then press
key to enter this mode.
4. Press ▲ key to select desired Brix % “ % ” or
Refractive index “ RI ” limit value setting mode.

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5. Press key to confirm the selection and to enter the high
limit value setting mode, the “ ▲” symbol and the previous
high limit setting value are displayed.
6. Press ◄ key to move the blinking cursor to the desired
position then press ▲or ▼key to set desired values, repeat
this step to all digits.
7. Press key to store the setting value and to enter the low
limit value setting mode, the “ ▼” symbol and the previous
low limit setting value are displayed.
8. Press ◄ key to move the blinking cursor to the desired
position then press ▲or ▼key to set desired values, repeat
this step to all digits.
9. Press key to store the setting value and exit this mode.
5-8-2 To Turn on and Turn Off Alarm Function
1. In the measurement mode, press and hold down the “ SET ”
key then press “ A.I.Alert ” key to turn on or turn off the alarm
function.
2. When the measured value is upper to the alarm high limit
setting value the beep will sound 12 seconds and the “▲”
symbol is blinking displayed.
3. When the measured value is below to the alarm low limit
setting value the beep will sound 12 seconds and the “▼”
symbol is blinking displayed.

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6. EXPLANATION OF ERROR MESSAGES
Error Code
LCD Display Description
Cover Sample plate cover not closed.
No sample
No sample exists on the prism
surface.
HHH
Sample exceeds maximum
measurement range
LLL
Sample is reading lower than the
0% standard used for meter zero
calibration.
Temperature
reading are
blinking
Temperature measurement out of
sampling range (<4.0°C)

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Error Code
LCD Display Description
Temperature
reading are
blinking
Temperature measurement out of
sampling range (>60.0°C)
ATC segment
blinking
Outside temperature
compensation range (10°C to
40°C)
CAL segment
ON
W
rong calibration used to zero the
meter. Use deionized or distilled
water.
CAL segment
ON
W
rong calibration used to zero the
meter. Use deionized or distilled
water.
CAL segment
ON
Temperature
reading are
blinking
Temperature exceeds ATC low
limit (10°C) during calibration.

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Error Code
LCD Display Description
CAL segment
ON
Temperature
reading are
blinking
Temperature exceeds ATC low
limit (40°C) during calibration.
no Light
LED light is not detected.
Contact local seller.
Battery
segment
blinking
<5% of battery life is remaining.

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7. BATTERY CHECK-UP & REPLACEMENT
1. When operating the meter on batteries, periodically check this
indicated to determine the remaining battery capacity. The
number of black segments decreases as the batteries are used
up. When the “ ” symbol blink display, correct measurement
is no longer possible. Replace the batteries with a fresh set.
2. Take care not to reverse the (+) and (-) polarity when inserting
the batteries.Always replace all four batteries together. Do not
mix old and new batteries or batteries of different type.
3. Prevention of battery fluid leakage:
 When the battery power is low, replace the new battery to
avoid possibility of further battery fluid leakage.
 In long-term, when the instrument is not in use, to avoid the
battery liquid leak damage, please remove battery out of the
instrument.
8. MAINTENANCE
1. After use, wipe off a sample adhering to the prism surface and
adjacent area use tissue paper wetted with water and remove
moisture completely with dry tissue paper. Cleaning should be
carried out before and immediately after each use of the meter
to maximize its life and optimize measurement results.
2. Never touch the measuring prism with hard tools made from
plastic, wood, rubber, metal, glass etc. Hard objects can quickly
damage the relatively soft prism glass, resulting in measurement
errors.

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9. BRIX TO REFRATIVE INDEX (nD) CONVERSION
TABLE
Table of Refractive Indexes and Brix %
%
n
20
% n
20
% n
20
%
n
20
% n
20
D
D
D
D
D
0 1.33299 20 1.36384 40 1.39986 60 1.44193 80 1.49071
1 1.33442 21 1.36551 41 1.40181 61 1.44420 81 1.49333
2 1.33586 22 1.36720 42 1.40378 62 1.44650 82 1.49597
3 1.33732 23 1.36889 43 1.40576 63 1.44881 83 1.49862
4 1.33879 24 1.37060 44 1.40776 64 1.45113 84 1.50129
5 1.34026 25 1.37233 45 1.40978 65 1.45348 85 1.50398
6 1.34175 26 1.37406 46 1.41181 66 1.45584 86 1.5067
7 1.34325 27 1.37582 47 1.41385 67 1.45822 87 1.5094
8 1.34477 28 1.37758 48 1.41592 68 1.46061 88 1.5122
9 1.34629 29 1.37936 49 1.41799 69 1.46303 89 1.5149
10 1.34782 30 1.38115 50 1.42009 70 1.46546 90 1.5177
11 1.34937 31 1.38296 51 1.42220 71 1.46790 91 1.5205
12 1.35093 32 1.38478 52 1.42432 72 1.47037 92 1.5234
13 1.35250 33 1.38661 53 1.42647 73 1.47285 93 1.5262
14 1.35408 34 1.38846 54 1.42863 74 1.47535 94 1.5291
15 1.35568 35 1.39032 55 1.43080 75 1.47787 95 1.5320
16 1.35729 36 1.39220 56 1.43299 76 1.48040
17 1.35891 37 1.39409 57 1.43520 77 1.48295
18 1.36054 38 1.39600 58 1.43743 78 1.48552
19 1.36218 39 1.39792 59 1.43967 79 1.48811