Felix Instruments F-751 Manual de usuario

F-751 Avocado Operation Manual Rev. 1/25/2023

Felix Instruments

1554 NE 3rd Ave

Camas, WA 98607, USA

Phone: +1 (360) 833-8835

Fax: +1 (360) 833-1914

www.felixinstruments.com

[email protected]m

Avocado Quality Meter

F-751

Operations Manual

F-751 Avocado Operation Manual Rev. 1/25/2023

Back To Table of Contents

Page |2

Felix Instruments

1554 NE 3rd Ave

Camas, WA 98607, USA

Phone: +1 (360) 833-8835

Fax: +1 (360) 833-1914

www.felixinstruments.com

[email protected]m

DECLARATION OF CONFORMITY

Manufacturer:

CID Bio Science, Inc.

Felix Instruments –Applied Food Science

1554 NE 3rd Ave

Camas, WA 98607

Declares that the CE-marked Product:

Product Model(s):

Model F-75x

FCC Compliance Statement:

This device complies with part 15 of the FCC Rules. Operation is

subject to the following two conditions: (1) This device may not cause

harmful interference, and (2) this device must accept any interference

received, including interference that may cause undesired operation.

Complies With:

89/336/EEC Electromagnetic Compatibility Directive

73/23/EEC Low Voltage Directive

Compliance Standards:

EN 55027 RF Emissions Information Technology Equipment

EN 50082-1 EMC Immunity Standard

EN 60950 Safety of Information Technology Equipment

Including Electrical Business Equipment

December 31, 2018 ______________________________

Leonard Felix

President

F-751 Avocado Operation Manual Rev. 1/25/2023 
 
 
Felix Instruments 
1554 NE 3rd Ave 
Camas, WA 98607, USA 
Phone: +1 (360) 833-8835 
Fax: +1 (360) 833-1914 
www.felixinstruments.com 
[email protected]m 
 
 
 
Contents 
 
Introduction .................................... 4 
Theory of Operation ................ 5 
Measurement Variance ........... 6 
Natural Variation of DM in 
Avocados............................. 6 
Variance Due to Analytical 
Procedure............................ 7 
Measurement Variance Due 
to Instrument ...................... 7 
Device Overview & Setup............... 8 
Package Contents .................... 8 
Loading the Battery ................. 8 
Protecting Your Device ............ 8 
Device Interface....................... 9 
Navigating Menus ............... 9 
Entering Text/Numbers....... 9 
Device in Use ................................ 10 
Powering On the Device ........ 10 
Device Options Menu ............ 10 
Connecting to a Wireless 
Network ............................ 10 
GPS Settings ...................... 10 
GPS Settings (Cont.) .......... 11 
Data Server........................ 11 
Uploading To FruitMaps.... 11 
Bin Setup .................................... 12 
Fruit Per Bin................................ 12 
 
 
 
Bin Options ............................ 13 
Bin Prefix ........................... 13 
Tags ................................... 13 
Fruit Per Bin....................... 13 
Enforce Bin Size................. 13 
Sides Per Fruit ................... 14 
Scans Per Side ................... 14 
Maturity Criteria................ 14 
Measurement Offsets ....... 14 
Archive Data .......................... 15 
Measurements Preparation... 15 
Measuring Avocados ............. 16 
Taking Measurements..................17 
Bin Summary.......................... 18 
Measurement Evaluation .............19 
Accessing Measurements on a 
PC: Using the SD Card ............ 19 
Accessing Measurements on a 
PC: Using the Data Server...... 21 
Accessing Measurements on 
FruitMaps............................... 23 
Updating The F-751 .....................24 
Updating Device Firmware .... 24 
Updating App......................... 25 
Troubleshooting ...........................26 
Contact Felix Instruments:..... 26 
Contents 
 

F-751 Avocado Operation Manual Rev. 1/25/2023

Felix Instruments

1554 NE 3rd Ave

Camas, WA 98607, USA

Phone: +1 (360) 833-8835

Fax: +1 (360) 833-1914

www.felixinstruments.com

[email protected]m

Introduction

Felix Instruments’ F-751 Avocado Quality Meter is a fast, portable tool for non-

destructively measuring avocado fruit quality. The F-751 can provide rapid dry

matter estimations for large numbers of fruit, giving orchard-wide estimations

and insights previously unattainable through traditional testing methods.

The F-751 primarily measures dry matter (DM). Dry matter is the inverse of

moisture content and can be thought of as the part of an avocado which would

remain if all the water content were removed. Due to its direct correlation to

mesocarp oil content, dry matter is the most common quality and maturity

index used to assess avocados. Maturity at harvest is directly correlated to

ripening time and fruit quality.

The F-751 uses light interactance in the NIR wavelength range to determine the

DM content of a conical region of mesocarp in the location where the lens is

placed on the fruit. Since the F-751 can be thought of as a “spot measurement”,

we recommend scanning at both the dorsal and ventral sides of the equator of

the avocado and using the average to gain the most accurate insight into the

average dry matter of the whole fruit.

F-751 Avocado Operation Manual Rev. 1/25/2023

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Felix Instruments

1554 NE 3rd Ave

Camas, WA 98607, USA

Phone: +1 (360) 833-8835

Fax: +1 (360) 833-1914

www.felixinstruments.com

[email protected]m

Incident

Beam

Backscattered light

Illuminated

Region

Figure 2. Schematic of light scattering

within an object after being struck with

Vis-NIR radiation from a spectrometer.

Incident light is reflected, absorbed, or

transmitted depending on the physical

and chemical composition of the sample

(Diagram adapted from Lu et al., 2017).

The F-751 Quality Meter utilizes a light interactance geometry (Fig. 1 & 2), in

which a halogen lamp directs NIR and visible light into the commodity. As light

Theory of Operation

At Felix Instruments, visible and near-infrared (Vis-NIR) spectroscopy

instrumentation is utilized to collect spectral signature data of various

agricultural and food commodities. This spectral data is then used alongside

data from destructive analytical testing to create predictive models that can

rapidly and non-destructively evaluate external and internal quality traits of

the commodity.

penetrates a sample, photons scatter,

and the resulting reflectance,

transmittance, and interactance spectra

is collected by a fiber optic lens (Lu et al.,

2017 & Cavaco et al., 2020). The resulting

frequency and wavelengths are called a

spectrum, enabling users to identify and

quantify the chemical composition of a

sample. To create regression-based

predictive models from this spectral data,

artificial neural networks (ANN) are

employed during chemometric analysis.

The use of ANN enables users to extract

hidden or unknown relationships in

complex multivariate datasets (Héberger,

2008). Some of the quality traits in

agricultural and food commodities that

are commonly modeled using NIR

spectroscopy and chemometrics include:

dry matter content (DM), total soluble

solids (TSS), titratable acidity (TA), pH, fat

content, water content, phenols, etc.

Figure 1. Geometrical configuration

of Vis-NIR spectra that may be

acquired in spectroscopic analysis.

Light is split when it strikes an object,

as some photons are absorbed, and

others are reflected (A) reflectance,

(B) transmittance, and (C)

interactance modes (Diagram

adapted from Cavaco et al.)

F-751 Avocado Operation Manual Rev. 1/25/2023

Back To Table of Contents

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Felix Instruments

1554 NE 3rd Ave

Camas, WA 98607, USA

Phone: +1 (360) 833-8835

Fax: +1 (360) 833-1914

www.felixinstruments.com

[email protected]m

Figure 3. Dry matter variation. Image adapted from Phetsomphou, 2000.

Measurement Variance

Factors that affect measurement variance include:

1. Natural variation of dry matter throughout the fruit

2. Analytical procedure

3. Accuracy of the instrument

Natural Variation of DM in Avocados

Dry matter is not homogeneously distributed throughout the mesocarp

(flesh) of the avocado (See Figure 3). It is possible to see a variation up to

15% DM or more depending on where the mesocarp is sampled. Therefore,

it is critical for the user to take multiple measurements at various locations

on a single avocado to obtain the most accurate prediction for the average

DM of that single avocado.

Outer: 33.6%

Middle: 39.1%

Inner: 38.0%

Outer: 36.0%

Middle: 36.4%

Inner: 26.9%

Outer: 29.4%

Middle: 39.8%

Inner: 45.2%

F-751 Avocado Operation Manual Rev. 1/25/2023

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Page |7

Felix Instruments

1554 NE 3rd Ave

Camas, WA 98607, USA

Phone: +1 (360) 833-8835

Fax: +1 (360) 833-1914

www.felixinstruments.com

[email protected]m

Variance Due to Analytical Procedure

Every measurement method has inherent sources of error. For most

gravimetric methods (e.g., oven, microwave, etc.) error can be attributed to

unrepresentative sampling and measurement error associated with

equipment (e.g., the balance not being properly calibrated, temperature not

being monitored, etc.). The F-751 most similarly mimics the coring sampling

technique, and thus will provide the most comparable results when the user

destructively analyzes a core sample taken from the scan site.

If a sampling technique other than coring is being utilized, then extra

precautions (e.g., increasing the number of scans and scan sites on the

avocado) must be taken to ensure the average DM value given by the

instrument aligns with current destructive testing methods.

Measurement Variance Due to Instrument

The new avocado application has been created with artificial neural

network (ANN) chemometrics, which has drastically reduced the amount of

inter-instrument variation. This ensures a high level of repeatability and

accuracy when taking measurements with the F-751. However, if the user

wishes to further reduce their measurement variation, it is recommended

that they increase their sample size. Increasing the sample size decreases

error significantly. Using the average DM of ten fruit will typically deliver

30% better performance than using the average DM of five fruit. Because it

is quick to measure with the F-751, we recommend a larger sample size that

delivers the desired performance.

F-751 Avocado Operation Manual Rev. 1/25/2023

Back To Table of Contents

Page |8

Felix Instruments

1554 NE 3rd Ave

Camas, WA 98607, USA

Phone: +1 (360) 833-8835

Fax: +1 (360) 833-1914

www.felixinstruments.com

[email protected]m

Figure 4. F-751 Parts

Device Overview & Setup

Package Contents

The instrument will arrive in a carrying case that includes:

Loading the Battery

The F-751 uses two 18650 Li-ion 3.7 V 3500 mAh rechargeable batteries.

The batteries must be removed from the F-751 to be charged. To remove

the batteries, twist the battery compartment cap counterclockwise, which is

located on the bottom of the device under the rubber bumper (See figure 7

on page 9). The cap can be tightened or loosened by twisting with fingers or

a screwdriver. Use caution when removing the batteries, as the cap is spring

loaded. Both batteries should be inserted into the unit positive (+) side first

(facing towards the lens).

Additional protected 18650 batteries can be purchased from a preferred

battery vendor.

Warning: Do not drop batteries, this may cause them to crack and rupture.

Protecting Your Device

Ensure that the rubber bumpers on the top and bottom of the F-751 are

always installed when using the instrument, as they protect it from water

damage.

The hand strap should be tightened so that the device has a snug and secure

fit around the hand. If the lens becomes dirty, it can be cleaned with a soft

cloth. The lens is made of extremely durable Gorilla Glass and should not

become scratched with normal use

Part

Quantity

F-751 Avocado Quality Meter

Removable Rechargeable batteries

Battery Charger

Hand Strap

Coring Tool

Lens Cloth

USB A to USB Micro Cable

F-751 Avocado Operation Manual Rev. 1/25/2023

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Page |9

Felix Instruments

1554 NE 3rd Ave

Camas, WA 98607, USA

Phone: +1 (360) 833-8835

Fax: +1 (360) 833-1914

www.felixinstruments.com

[email protected]m

Device Interface

Observe the location of the key features on the F-751:

Navigating Menus

The instrument’s interface is composed

of menus that are operated using

navigation buttons.

Up/Down navigates between menu

items.

Left navigates back to the previous

menu.

Right navigates into the selected menu

item.

Entering Text/Numbers

When prompted, text/numbers can be

entered on the device by using the

navigation buttons.

Up/Down navigates between

letters/numbers for the current cursor

position.

Left navigates the cursor to text that

has already been entered. Navigating

past the beginning of the text aborts

and returns to the previous menu.

Right navigates the cursor to text that

has already been entered. Navigating

past the end of the text saves the

desired entry and continues.

Figure 7. Bottom of Device

Figure 6. Top of Device

Figure 5. Front of Device

SD Card Slot

Measurement Lens

Battery Housing

Tripod Adaptor

Power On/Off Button

Measure Button

Navigation Buttons

Micro USB Port

F-751 Avocado Operation Manual Rev. 1/25/2023

Back To Table of Contents

Page |10

Felix Instruments

1554 NE 3rd Ave

Camas, WA 98607, USA

Phone: +1 (360) 833-8835

Fax: +1 (360) 833-1914

www.felixinstruments.com

[email protected]m

Device in Use

Powering On the Device

Press the Power On/Off button to

power on the instrument.

This process takes a few moments,

and the display will show the splash

screen when the instrument is

prepared to measure avocados.

Device Options Menu

Upon turning on the device, press

Right to navigate to the main menu.

Highlight Device Options and press

Right to access the device’s options

menu. From this menu, basic device

settings including Date and Time,

Keypad and Notification Sounds,

Backlight Intensity, and Language

Settings, can be adjusted.

Connecting to a Wireless Network

The F-751’s possess Wi-Fi capabilities, allowing for a streamlined data

uploading process. Highlight Wi-Fi and press Right. Highlight Wi-Fi State and

press Right. Use the Up/Down buttons to select between enabling or

disabling this feature and press Right to confirm selection.

Highlight Networks, then press Right. Select a network, enter the passcode

as directed on-screen, and press Right to confirm selection.

GPS Settings

The F-751’s GPS feature allows users to get accurate GPS data for each

measurement taken. Highlight GPS and press Right. Highlight GPS State and

press Right. Use the Up/Down buttons to select between enabling or

disabling this feature and press Right to confirm selection. This process takes

a few moments.

Once GPS State is enabled, users can view latitude, longitude, accuracy status,

and more. To view this, highlight View Status and press Right.

Wi-Fi

Date and Time

Sounds (Enabled)

Backlight (Disabled)

Language

Data Server

FruitMaps.com

GPS

Avo

Press to record a measurement

Press to view the main menu

S/N: 751-002-00000

V0.0.0 build 00000

100%

App Build: 00/00/0000 00:00

Figure 8. F-751 Startup Screen

Figure 9. Device Options Menu

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