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Det-Tronics X9800 IR Flame Detector with Pulse Output User Manual

Page 5

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5.1

Important

Mag

oi

can be performed with the controller’s

(R7404/R7494) keylock switch in either the
NORMAl or TEsT position. In NORMAl, the
controller goes into alarm and activates its outputs.
If no controller alarm output is desired, place
the keylock switch in the TEsT position before
touching the magnet to the outside of the detector.
Man

oi

operates only with the keylock switch in

the TEsT position.

During the entire test, the detector gives no indication

of alarm.

To reset the controller status and alarms, place the

keylock switch in RESET. Return the keylock switch to

NORMAL when testing is complete.

The Man oi test is nearly identical to the Mag oi test,

except for the manner in which the test is initiated:

• Place the keylock switch on the controller (R7404/

R7494) in the TEST position.

• Press the SELECT button to select the appropriate

detector for test.

• Press the TEST/ACCEPT button to initiate the test.

Controller and detector responses are identical to the

Mag oi test described above.

To reset the controller status and alarms, place the

keylock switch in RESET. Return the keylock switch to

NORMAL when testing is complete.

NOTE

Refer to Appendix A for FM verification of
Det-Tronics’

oi

function.

COMMUNICaTION
The X9800 is furnished with an RS-485 interface for

communicating status and other information with external

devices. The RS-485 uses MODBUS protocol, with the

detector configured as a slave device.

DaTa LOggINg
Data logging capability is also provided. Status

conditions such as normal, power down, general and oi

faults, pre-alarm, fire alarm, time and temperature are

recorded. Each event is time and date stamped, along

with the temperature and input voltage. Event data is

stored in non-volatile memory when the event becomes

active, and again when the status changes. Data is

accessible using Det-Tronics’ Inspector Connector

accessory or RS-485.

INTEgRaL wIRINg COMpaRTMENT
All external wiring to the device is connected within the

integral junction box. The detector is furnished with

four conduit entries, with either 3/4 inch NPT or M25

threads.

SIgNal PROCESSINg OPTIONS

The X9800 features signal processing options. These

options determine the type of logic that the detector will

use for processing fire signals to customize the X9800

to the application. Two signal processing options are

available for the X9800:

TDSA enabled

Both TDSA and Quick Fire enabled (either initiates

fire alarm).

Time Domain Signal analysis (TDSa)
The TDSA signal processing technique analyzes the

input signal in real time, requiring the IR signal to flicker

randomly in order to recognize it as a fire condition.

Using TDSA signal processing, the X9800 ignores

regularly chopped blackbody sources (occurring in areas

where moving conveyors and hot objects in proximity

to one another result in a regularly chopped IR signal),

because it looks for a less uniform signal. However, in

the presence of a regularly chopped signal, the unit is

more susceptible to false alarms due to sporadic IR that

functions as a trigger when occurring in conjunction with

the regularly chopped signal.

Quick Fire (High Speed)
The Quick Fire (High Speed) feature can be used in

conjunction with the TDSA signal processing method.

This method overrides TDSA requirements in the event

of an intense signal. When Quick Fire is activated, the

detector is capable of responding to an intense fire signal

in less than 30 milliseconds (0.030 seconds). Using

the Quick Fire feature in conjunction with TDSA signal

processing allows the detector to provide a high speed

response to a large, non-flickering fire (such as in high

pressure gas applications) while maintaining an ability to

respond to smaller fires.