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2. Product identification

The 

FLUX SA

 is a single channel stand-alone inductive loop detector 

designed for vehicle access applications. 

The detector is responsive, highly sensitive, and utilises sophisticated 
software algorithms which adapt to prevent false triggering due to 
changing environmental conditions. Easy to use dipswitches, as well as 
visual and audible feedback of loop operation, ensure a hassle-free 
installation experience.

Typical uses include free-exit loops, safety loops, closing loops for 
traffic barriers, arming loops for access control equipment, and 
general vehicle sensing applications. 

1. Introduction

IMPORTANT

Safety Instructions

1.

All installation, repair, and service work to this product must be 
carried out by a suitably qualified person.

2.

Do not in any way modify the components of the system.

3.

Do not install this product near sensitive electrical components 
(e.g. the DOSS sensor inside a CENTSYS gate operator 
housing).

4.

Do not install the equipment in an explosive atmosphere: The 
presence of flammable gas or fumes is a serious danger to safety.

5.

Before attempting any work on the system, cut electrical power 
and disconnect the batteries.

6.

Do not leave packing materials (plastic, polystyrene, etc.) within 
reach of children, as such materials are potential sources of 
danger.

7.

Dispose of all waste products like packaging materials, etc., 
according to local regulations.

8.

 does not accept any liability caused by improper 

use of the product, or for use other than that for which 
the system was intended.

9.

This product was designed and built strictly for the use indicated 
in this documentation. Any other use, not expressly indicated 
here, could compromise the service life/operation of the product 
and/or be a source of danger.

10. Anything not expressly specified in these instructions is not 

permitted.

CENTSYS

3. Technical specifications

Supply voltage

Standby current

Output relay rating

Detection time

Indicators

Visual

Audible

Detector tuning range

Surge protection

Connectors

Dimensions

Mass

IP rating

10 - 40V DC

7 - 28V AC

50mA

1A @ 125V AC

4ms @ 100kHz loop frequency

10ms @ 40kHz loop frequency

LED indicators showing Power, Loop Fault, 
Loop detection level (5 LEDs), Detect 

Buzzer with indication of loop detection level 
and loop fault

15 - 1500µH

Isolation transformer with 10kA lightning 
protection

Removable connectors for ease of 
maintenance

105mm (length) X 60mm (width) X 26mm 
(height)

85 grams

IP50

4. Standard features of the detector 

Pressing the reset button enables the detector to be 
manually reset at any time. This results in the 
detector re-tuning the sensing loop and becoming 
ready for vehicle detection. In addition, a 0.5s 
output pulse will be generated.

If this switch is ON, the detector is in Run Mode, and 
functions normally. If OFF, the detector halts, and 
the output relay defaults to the detected state. This 
is useful when working on a traffic barrier, as it will 
prevent the barrier from lowering.

The frequency of the loop is determined by the 
inductance of the loop and the frequency switch 
setting. If the frequency switch is on, the frequency 
is reduced by approximately 25%. It may be 
necessary to change the frequency to prevent cross-
talk between adjacent loops. 

Frequency 
Selection 
Switch

Controls the audible indicator – a useful diagnostic 
tool when setting up the loop

Configures the output as either pulsed or presence

Pulse/
Presence 
Switch

If pulsed output is selected, this switch configures 
the output pulse to be generated when the vehicle 
is either detected (enters the loop), or undetected 
(exits the loop).

Detect/
Undetect 
Switch

This switch enables a delay of two seconds between 
detection of the vehicle and switching of the output. 
This delay is normally used to prevent false 
detection of fast-moving objects.

Filter Switch

This option increases the sensitivity of the detector 
after initial detection of a vehicle. This is useful to 
reliably detect vehicle and trailer combinations. 
Sensitivity returns to the selected value once the 
vehicle has been undetected.

Automatic 
Sensitivity 
Boost (ASB) 
Switch

If selected together with Presence Output, the 
output will remain active as long as a vehicle 
remains on the loop. The danger of using this 
setting is that any change in the environment (for 
example the introduction of metal into the vicinity 
of the loop) will not automatically be tuned out 
without pressing the reset button. If not selected, 
the loop will automatically tune out any permanent 
detection after five minutes.

Permanent 
Presence 
Switch

Adjustable 
Loop 
Sensitivity 
Switches

This red LED is on when power is present, and the 
controller is functioning.

Power 
Indicator LED

This red LED is illuminated when there is a loop 
fault. If the loop is open circuit, the Fault LED will 
flash continuously. If the loop is short circuit, it will 
remain on.

Loop Fault 
Indicator LED

These five red LEDs provide a visual indication of 
the Detection Level. Once all five LEDs are on, the 
detection threshold is almost reached. This is a very 
useful feature to determine if the loop is going to 
perform reliably. With no vehicle in the vicinity, all 
the LEDs should be off.

Detection 
Level 
Indicator 
LEDs

1.

Connectors

2.

FLUX SA

 housing

3.

Bootloader header

4.

Reset button

5.

Diagnostic LEDs

6.

Dipswitches 

7.

Dipswitch cover

1

3

5

6

7

Sensitivity

Dipswitches

LED indicators

Reset Button

Run Switch

Buzzer Enable 
Switch

SENS 1       SENS 2

OFF

OFF

OFF

ON
OFF
ON

ON
ON

Four sensitivity settings are available

High
Medium high
Medium low
Low

www.centsys.com.au

FLUX SA
Pocket installation manual

SENSITIVE

INDUCTIVE 

LOOP DECTOR

TM

2

4

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