Halfords Essentials 684146

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684146 Halfords ESS 10 Function Computer

POWER AUTO ON/OFF

To preserve battery, this computer will automatically switch off when it

has not been used for about 10 minutes. The power will be turned on

automatically by riding the bicycle or by pressing the button.

MODE BUTTON

Quickly press this button to move in a loop sequence from one basic

function screen to another. (Fig. 2)

ALL CLEAR OPERATIONS (Initiate the Computer)

Press the ALL CLEAR (AC)

 key to initiate the computer or use ALL

CLEAR if any irregular data appears. It will clear all stored data.

RESET OPERATION

1. Hold down the “MODE

” button till the LCD digit is blanked, then

release it. The computer will RESET the DST, TM, AVG, MAX.

2. It cannot reset , TTM and ODO data.

RECALIBRATIONS (Fig. 3)

1. Change the LCD display to ODO screen, hold down the “MODE

”

button till (about 6 seconds) it jumps into the calibrating screen.

2. Refer to the main unit setup process to adjust the circumference.

3. Hold down the “MODE

” button till (about 6 seconds) it jumps out

the recalibration mode to store the desired data and complete

recalibrations.

12HR CLOCK SETTING (Fig. 4)

1. Change the LCD display to “ ” screen.

2. Press the “MODE

” button till (about 6 seconds) it jumps into the

clock adjusting screen to set the clock.

A quick press of the “MODE” button advances the flickering digit by 1.

4. To change the flickering digit, hold down the “MODE” button till

the flickering digit moves to the next digit.

5. Hold down the “MODE

” button till (about 6 seconds) it jumps out

the setting to store the desired data and complete clock setting.

BATTERY CHANGE

1. When the brightness of the LCD display is dim, it means that the

battery is nearly exhausted.

2. Replace with a new LR44

(Cross reference type A76, AG13 or V13GA)

battery in the compartment on the back of the computer with the

positive (+) pole toward the battery cap.

operation as long as the bicycle is being ridden.

: 12HR Clock

1H00M00S-12H59M59S, 1 Second, +/- 0.05%

It displays the current time in 12HR clock.

TM: Riding Time

0H00M00S-19H59M59S, 1 Second, +/- 0.05%

The TM totals the riding time from the last RESET operation.

AVG: Average Speed

0.0–199.9KM/h (120.0 M/h), 0.1KM/h (M/h), +/- 0.1%

1. It is calculated from the DST divided by the TM; the average data

counted is from the last RESET to current points.

2. It displays an "Err" symbol when either the TM is over 100 hours or

the DST is over 1,000 km (or miles). Reset the unit in order to restart.

MAX: Maximum Speed

0.0–199.9KM/h (120.0 M/h), 0.1KM/h (M/h), +/- 1%

It shows the highest speed from the last RESET operation.

TTM: Total Riding Time

0H00M–1999H59M, 1 Minute, +/- 0.05%

The TTM totals the riding time from the last ALL CLEAR operation.

ODO: Odometer

0.0–19999.9Km (Miles), 0.1Km (Mile), +/- 0.1%

The ODO accumulates the total distance as long as the bike is moving.

The ODO data can be cleared by the ALL CLEAR operation only.

: SCAN

1. Auto-Scanning Display Mode

Press the MODE

 button till the “ ” symbol is displayed. The

computer will change the DST, , TM, AVG, MAX, TTM and ODO

display modes in a loop sequence automatically every 6 seconds.

2. Fixed Display Mode

Press the MODE

 button to turn off the “ ” symbol and select a

desired display mode; the computer will stop the auto-scanning

display operation and the display mode is set.

/ : Speed Pacer

It flashes the “ ” speed pacer arrow while the current speed is higher

than the average speed and the down arrow “ ” flickers conversely.

16 x 17.5 x 2

20 x1.75 x 2

24 x13 /8A

24 x1.75 x 2

26 x1

26 x 1.5

26 x1.6

26 x 1.75 x 2

26 x 1.9

1217

1590

1948

1907

1973

2026

2051

2070

2089

47 - 305

47 - 406

37 - 540

47 - 507

23 - 571

40 - 559

44 - 559

47 - 559

50 - 559

54 - 559

57 - 559

37 - 590

37 - 584

20 - 571

32 - 630

28 - 630

40 - 622

26 x 2.00

26 x 2.215

26 x 13/8

26 x13/8 x 11/2

26 x 3/4

27 x 11/4

27 x 11/4 Fifty

28 x 1.5

28 x 1.75

2114

2133

2105

2086

1954

2199

2174

2224

2268

40 - 635

37 - 622

18 - 622

20 - 622

23 - 622

25 - 622

28 - 622

32 - 622

37 - 622

40 - 622

28 x 11/2

28 x 11/8 x 15/8

700 x18c

700 x 20c

700 x 23c

700 x 25c

700 x 28c

700 x 32c

700 x 35c

700 x 40c

2265

2205

2102

2114

2133

2146

2149

2174

2205

2224

WHEEL SIZE

Setting

Value

WHEEL SIZE

Setting

Value

WHEEL SIZE

Setting

Value

WHEEL SIZE CHART

Setting Value

= mm x 3.14

= Inch x 25.4 (mm) x 3.14

Inch

RECALIBRTIONS

Fig.2 Fig.3

Fig.4

Fig.5

calibration

Complete

Setting

TOTAL 6 SEC

clock

setting

CLOCK SETTING

Complete

Setting

TOTAL 6 SEC

PROBLEM

CHECK ITEMS SOLUTION



DST

MAX

ODO

TTM

ODO/ SCAN

CLK

AVG

10 function : SPD, DST, ODO, CLK, AVG, MAX, TM, TTM, SCAN, SPEED PACER.

BATTERY

CHANGE

1.5V

Battery

(LR44 Typical)

LCD

SEGMENTS

AUTO TEST

Calbration (unit selection & circumference setting)

End setting

2s2s

0~3

Main unit setup

Fig.1

Current

Speed

Functions

Symbol

Speed Pacer

WHEEL CIRCUMFERENCE

1. Roll the wheel until the valve stem at its lowest point close to the

ground, then mark this first point on the ground. (Fig. 5)

2. Get on the bike and have a helper push you until the valve stem

returns to its lowest point. Mark the second point on the ground.

(Sitting on the bike achieves a more accurate reading since the weight

of the rider slightly changes the wheel circumference).

3. Measure the distance between the marks in milimeters. Enter this

value to set the wheel circumference.

Option: Get a suitable circumference value from the table. (Fig. 6)

4. Adjust the wheel circumference as the data setting process.

MODE



 PRECAUTIONS

1. This computer can be used in the rain but should not be used under

water.

2. Don’t leave the main unit exposed to direct sunlight when not riding the

bike.

3. Don’t disassemble the main unit or it’s accessories.

Check relative position and gap of Speed Sensor and magnet periodically.

Clean the contacts of the bracket and the bottom of the main unit periodically.

6. Don’t use thinner, alcohol or benzine to clean the main unit or its

accessories when they become dirty.

7. Remember to pay attention to the road while riding.

MAIN UNIT SETUP (Fig.1) English

1. Be sure to press the All Clear (AC) key  to clear all stored data and

initiate the computer before using it or when replacing batteryotherwise

the unit may malfunction.

2. The LCD segments will be tested automatically after the All Clear key is

pressed.

3. Press the “MODE” button to stop the LCD test, then the flicking “KM/h”

and “c2155” will be displayed.

 CALIBRATION

1. UNIT SELECTION

1). Press the “MODE

” button to select “KM/h” or “M/h”(Mile/h).

2). Hold the “MODE

” button till the flickering digit is changed to the

digit “2” of the c2155 to recognize either KM/h or M/h as desired.

2. CIRCUMFERENCE DATA SETTING

1). The default is set at 2155mm. Measure the value for your wheel

(Fig. 5) or refer to the quick table provided in the manual for your

bicycle. (Fig. 6)

2). A quick press of the “MODE

” button advances the flickering digit

by 1.

3). To change the flickering digit, hold down the “MODE

” button till the

flickering digit moves to the next digit.

FUNCTIONS (Fig. 2)

: Current Speed 0.0–199.9KM/h (120.0 M/h), 0.1KM/h (M/h), +/- 1%

The current speed is always displayed on the 4 digits set when riding.

DST: Trip Distance

0.00–999.99Km (Miles), 0.01Km (Mile), +/- 0.01%

The DST function accumulates the distance data from the last RESET

BUTTON AND OPERATIONS

AUTOMATIC START/STOP

1. The computer will automatically begin counting , ODO, DST,

MAX, TTM, TM and AVG data upon riding and stop counting data

when riding is stopped.

The flickering symbol “ ” indicates that the computer is at START status.

 TROUBLE SHOOTING

Check the following before taking unit in for repairs.

1. Is the battery dead?

2. Is there incorrect battery

installation?

1. Is it at the recalibrating

or 12HR clock setting

screen?

Are the contacts between

the main unit and the

bracket poor?

3. Are the relative positions

and gap of Speed Sensor

and magnet correct?

4. Is the wire broken?

5. Is the circumference

correct?

Did you leave main unit

under direct sunlight when

not riding the bike for a

long time?

Is the temperature below

0°C (32°F)?

1. Replace the battery.

2. Be sure that the positive pole

of the battery is facing the

battery cap.

1. Refer to the adjusting

procedure and complete the

adjustment.

2. Wipe contacts clean.

3. Refer to Installation(Fig.C1)

readjust data correctly.

4. Repair or replace wire.

5. Refer to "CALIBRATION"

and enter correct value.

Refer to the "MAIN UNIT SETUP"

and initiate the computer again.

Place main unit in the shade to

return to normal state.No

adverse effect on data.

Unit will return to normal state

when the temperature rises.

No display

No current

Speed or

incorrect

data

Irregular

display

LCD is

black

Display is

slow

Fig.6

Need help?

Do you have a question about the Halfords Essentials 684146 and is the answer not in the manual?

This document describes the Halfords ESS 10 Function Computer, a wired bicycle computer designed to provide various cycling metrics.

Function Description:

The Halfords ESS 10 Function Computer is a wired device that mounts to a bicycle and displays real-time cycling data. Its primary functions include:

Speed Display: Shows current speed, average speed, and maximum speed.
Distance Tracking: Records trip distance (DST) and total odometer (ODO).
Time Keeping: Displays clock time (CLK) and trip riding time (TM).
Scan Function: Automatically cycles through DST, CLK, TM, AVG, MAX, and ODO displays.
Calibration: Allows for accurate wheel size input to ensure precise measurements.

Important Technical Specifications:

Battery: Uses a CR2032 coin battery.
Display: Features a digital LCD display with various segments for different metrics.
Sensing Mechanism: Utilizes a wired sensor and a magnet attached to the wheel spoke to detect wheel rotations. The gap between the magnet and the sensor should be less than 5 mm for accurate readings.
Wheel Size Input: Supports a wide range of wheel sizes for calibration, from 17-505 mm to 28 x 1 1/2 inches, with specific settings for various tire dimensions.
Units: Displays speed in km/h or mph, and distance in kilometers or miles.

Usage Features:

Installation:
- Mounting the Computer: The computer unit can be mounted on either the handlebar (B-a) or the stem (B-b) using the provided bracket. The bracket allows for easy slide-on and slide-off of the computer unit.
- Sensor and Magnet Installation: The wired sensor attaches to the front fork, and the magnet attaches to a spoke on the front wheel. It is crucial to align the center of the magnet with either sensing point on the sensor, maintaining a gap of less than 5 mm.
- Cable Management: The sensor cable should be routed neatly along the brake cable or fork, secured with zip ties, to prevent interference with moving parts.
Initial Setup and Calibration:
- Battery Installation: Insert the CR2032 battery into the battery compartment.
- Unit Selection: Choose between km/h or mph using the "MODE" button.
- Wheel Size Input: Enter the correct wheel circumference (in mm) or select from a predefined list of wheel sizes (e.g., 26 x 1.75, 700 x 23C). This is critical for accurate speed and distance measurements. The manual provides a detailed table for wheel circumference values.
- Clock Setting: Set the current time (12H or 24H format).
- Odometer Setting: Input the initial odometer reading if desired.
Operation:
- Mode Button: Cycles through DST, CLK, TM, AVG, MAX, and ODO displays.
- Set Button: Used for entering settings and confirming selections during calibration.
- Scan Function: Activates an automatic display cycle through DST, CLK, TM, AVG, MAX, and ODO.
- Resetting Data: Trip data (DST, TM, AVG, MAX) can be reset by holding the "MODE" button for 3 seconds. The odometer (ODO) cannot be reset.
- Power Auto ON/OFF: The computer automatically switches on when motion is detected and turns off after a period of inactivity to conserve battery.

Maintenance Features:

Battery Replacement: When the display becomes dim or shows "E" (empty battery indicator), replace the CR2032 battery. Ensure proper polarity (+ side up).
Troubleshooting:
- No Display: Check battery installation and replacement.
- No Current Speed/Distance: Verify sensor and magnet alignment, ensuring the gap is less than 5 mm. Check for loose connections or damaged wires.
- Incorrect Data: Re-calibrate the wheel size.
- Irregular Display: Check for strong electromagnetic interference (e.g., from other electronic devices).
- Display is too low in temperature: The unit's performance may be affected by extreme cold.
Cleaning: Use a soft, dry cloth to clean the unit. Avoid harsh chemicals or abrasives.
Storage: Remove the battery if the device will not be used for an extended period.
Water Resistance: The device is designed to be splash-proof but should not be submerged in water. Avoid using high-pressure water to clean the unit.
Safety: Always prioritize road safety. Do not operate the computer while riding.