Extech Instruments RF153 User manual
2 RF153-en-GB_V1.111/18
Table Contents
1. Introduction 3
2. Safety 4
3. Specifications 8
4. Product Descriptions 10
5. Operation 12
6. Maintenance 20
7. Customer Support 22
3 RF153-en-GB_V1.111/18
1. Introduction
Thank you for selecting the Extech RF153
Brix Meter. We ship this meter fully tested.
With proper use, it will provide years of
reliable service.
1-1 Features
•Wide measurement range (Brix 0~53%)
•Sugar content (Brix%) display
•Refractive Index (RI) measurement
•High resolution (Brix 0.1%)
•Auto Temperature Compensation ATC
•Dual LCD display
•Low power consumption
•IP65 Splash/Dust-proof
•Automatic measurement function
•Memory mode automatically stores up to
10 readings
•Sapphire coating is abrasion and
corrosion-resistant
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1-2 Applications
•Sugar, food and beverage production
inspection (fruit juices, soft drinks).
•Measure sugar concentration in cane,
fruits, vegetables, etc.
•Measure sugar content of fruit and plants
to determine maturity (helpful in seed
selection, and fertilization).
•For use in canning factories, breweries,
beverage plants, etc. for quality control
inspections to determine the degree of
sugar (Brix).
•For use in restaurants for sweetness
control.
•Control the concentration of industrial
fluids (cutting coolants, hydraulic fluids,
and antifreeze) to prevent corrosion.
2. Safety
Read the following safety information
carefully before attempting to operate or
service the meter. Only qualified personnel
should perform repairs.
5 RF153-en-GB_V1.111/18
2-1 Safety Symbols
CE Certification.
Restricts the use of six
substances within electrical and electronic
equipment (EEE).
REACH（SVHC）This device does not
use materials or substances identified by
REACH to be potentially harmful or
hazardous.
IP (Int’l Protection Classification)
Conforms to the IP65 waterproof
specification.
You, as the end user, are legally bound (EU
Battery ordinance) to return all used batteries, disposal
in the household garbage is prohibited! You can hand
over your used batteries / accumulators at collection points
in your community or wherever batteries / accumulators are
sold!
Disposal: Follow the valid legal stipulations in respect of
the disposal of the device at the end of its lifecycle.
6 RF153-en-GB_V1.111/18
2-2 Warning
To avoid injury:
•Please read the manual carefully to
ensure safe and correct use of this
device.
•Do not disassemble or modify the meter.
•Do not attempt to repair the meter. Only
qualified personnel may do so.
•This is high precision device, do not
apply excessive force or pressure to the
LCD or prism. Avoid shock and vibration.
•Do not use this meter near magnets or
magnetic fields.
•Do not use the meter near an open flame
or in flammable environments.
•Do not use this meter where the ambient
temperature exceeds the recommended
range of 10°C (50ºF) to 40°C (104ºF) or
in areas where the Relative Humidity
exceeds 80%.
7 RF153-en-GB_V1.111/18
•If the temperature of the liquid that you
wish to measure is extreme, allow it to
settle to a workable temperature before
use.
•Do not use metal tools when sampling.
Metals can damage the prism surface.
•The prisms are coated for protection; do
not use acetone to clean the prism, as
this will harm the coating.
•After use, please follow the user manual
instructions for cleaning the prism. Close
the prism cover when storing.
•If the meter is to be stored for a long
period, remove the battery and close the
prism cover.
•Never use organic solvents for cleaning.
8 RF153-en-GB_V1.111/18
3. Specifications
Model
Extech RF153
Sensor Element
Photodiode Array Detector
Measurements
Brix %
Temperature (oC/oF)
Refractive index (RI)
Ranges
Brix %
Water
4~60oC
(39
～
140oF)
0.0～53.0%
(10~40oC [50~104oF]
Automatic Temperature
Compensation)
RI
Water
4~60oC
(39
～
140oF)
1.3301~1.4374
Temperature
4.0～60.0oC (39.0～140.0oF)
Accuracy
(Water
73.4oF/23oC)
Brix ±0.2%
Temperature ±1oC(oF)
RI ±0.0003
Resolution
Brix: 0.1%
Temperature: 0.1oC(oF)
RI: 0.0001
Operating
conditions
10～40oC (50～104oF)
< 80% RH
9 RF153-en-GB_V1.111/18
Storage
conditions
0～50oC (32～122oF)
< 80% RH
Response time
3 seconds
IP rating
IP65 splash/dust-proof
Data Hold
Freezes displayed reading
Low battery
indication
Four levels
Data storage
10 storage locations
Zero Function
Zeros the display
Auto Power Off
2 minutes (approximately)
Power supply
2 x ‘AAA’ batteries
Dimensions
113 x 60 x 38 mm
(4.4 x 2.4 x 1.5”)
Weight
120g (4.23 oz.) without battery
Accessories
Wrist strap, pouch, 2xAAA
batteries, and user manual
10 RF153-en-GB_V1.111/18
4. Product Descriptions
4-1 Meter Description
1. Prism Cover
2. Prism
3. Measure (short press) / Zero (long
press) / Scroll up button (short presses
in Memory mode only)
4. Power ON/OFF (long press) / RCL
(short press to select Memory mode)
5. Unit button (short press for RI/BRIX;
long press for temperature units)
6. LCD display
7. Battery cover
8. Battery compartment secure screw
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