Det-Tronics X2200 UV Flame Detector User Manual

Page 5

95-8549

13.1

Magnetic

/ Manual

The detector also incorporates both Magnetic

(Mag

) and Manual

(Man

) features that

provide the same calibrated test as the Automatic

, and in addition actuates the Alarm output to verify

operation for preventive maintenance requirements.

These features can be performed at any time and

eliminate the need for testing with a non-calibrated

external test lamp.

CaUtIon

These tests require disabling of all extinguishing
devices to avoid release resulting from a
successful test.

The Mag

test is performed by placing a magnet

at the location marked "MAG OI" on the outside
of the detector (see Figure 2). The Man

test is

accomplished by connecting the

lead (terminal

22) to power supply minus via an external switch. The

magnet or switch must be held in place for a minimum

of 6 seconds to complete the test. Either of these

test methods activates the calibrated UV emitter. If

the resulting signal meets the test criteria, indicating

that greater than half of the detection range remains,

the Alarm output changes state, the indicating LED

changes to red, and the 0-20 mA current output goes

to 20 mA. This condition remains until the magnet

is removed or the switch is released, regardless of

whether the relays are set for latching or non-latching

operation.

If less than half of the detection range remains, no

alarm is produced and a fault is generated. The fault

indication can be reset by momentarily applying the
Mag

or Man

switch.

NOTE

Refer to Appendix A for FM verification of
the

function.

COMMuNICATION
The X2200 is furnished with an RS-485 interface for

communicating status and other information with external

devices. The RS-485 supports MODBUS protocol, with

the detector configured as a slave device.

For HART communication, connect a HART communicator

across a 250 ohm resistor in the 0-20 mA loop.

NOTE

The EQP model uses LON/SLC communication.
RS-485 and HART communication are not
available on the EQP model.

DATA LOggINg
Data logging capability is also provided. Status
conditions such as normal, power down, general and

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 the Inspector Connector accessory,

RS-485, or the EQP Controller.

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 UV detector output (measured in counts per second)

is compared to the fire threshold (the "sensitivity" setting).

If the radiant energy level from the fire exceeds the

selected alarm threshold level, the fire alarm output is

activated. In every application, it is crucial to ensure that

the radiant ultraviolet energy level from the expected fire

at the required distance from the detector will exceed the

selected sensitivity level.

The UV detector in the X2200 can be programmed for:

–

Arc Rejection

–

Standard Signal Processing

Arc Rejection
The Arc Rejection mode enables the detector to

prevent nuisance fire alarms caused by UV from short-

duration electrical arcs or electrostatic discharge, while

maintaining the ability to reliably detect the UV radiation

given off by a flame. Typical applications that benefit

from arc rejection logic include electrostatic coating

processes and uncontrolled environments where

transient UV sources can be present, such as many

typical outdoor applications. Most false alarm sources

have short transient UV signatures, while fire creates

a long UV signature over many seconds. Most fires

are detected in a few seconds (see response times in

Appendix A).

standard signal processing
Standard signal processing is recommended for high-

speed suppression systems only. To allow for high-speed

operation, the standard processing mode does not

incorporate the arc rejection programming. This mode

should only be used in a controlled, indoor environment.