Zeta Alarm Systems ZT-20EX User manual

Flame Detectors
Model: ZT-20EX / ZT-500EX
User Guide
47-153 / 47-154 , Rev. A, Aug 15, 2019
Zeta Alarms Limited
Detection House, 72-78 Morfa Road, Swansea, SA1 2EN, United Kingdom
Phone: [phone] Fax: [phone]
Website: www.zetaalarmsystems.com Email: [e-mail]

User Guide of ZT-20EX & ZT-500EX
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<User Guide of ZT-20EX & ZT-500EX>
TABLE OF CONTENTS
<User Guide of ZT-20EX & ZT-500EX> .....................................................3
1Unpack & Checking contents ...............................................................4
2Internal Wire Cabling & DIP SW setting ................................................5
3Installation .......................................................................................7
4Operation .........................................................................................8
5Technical Specification ..................................................................... 14
LIST OF FIGURES
Figure 1. Product Contents & Outline Indication............................................................. 4
Figure 2. Removing the back cover.................................................................................. 5
Figure 3. Arranged for wire cabling ................................................................................. 5
Figure 4. Connecting Wires & Securing the cable gland.................................................. 6
Figure 5. Assembling & Combining the covers................................................................ 6
Figure 6. Swivel Mount (TM-AL10)................................................................................ 7
Figure 7. Swivel Mount (TM-ST10)................................................................................. 7
Figure 8. Installed Detectors on wall................................................................................ 7
Figure 9. Typical 4-Wiring for Relay Contact Output.................................................... 11
Figure 10. 4-20mA Output Jumper Placement............................................................... 12
Figure 11. 4-20mA Source and Sink............................................................................... 13
Figure 12. RS-485 Networking....................................................................................... 14
LIST OF TABLES
Table 1. Output Signals/LED Indications versus Detector State ............................. 8
Table 2. DIP Switch Settings......................................................................................... 9
Table 3. Output Interface of Connection PCB........................................................... 10

47-153 / 47-154 , Rev. A, Aug 15, 2019
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1 Unpack & Checking contents
-Unpack the delivered pack and check the following contents.
Figure 1. Product Contents & Outline Indication
Detector
Ex Cable Gland
(*Optional)
2-meter Cable Wires
(*Optional)
Swivel
Mount
Screws for
Swivel Mount
Label
for wiring colors
Coupler
(*Optional)
Quick Start Guide
/Other Notes
Bracket
Mounting
Knob

User Guide of ZT-20EX & ZT-500EX
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2 Internal Wire Cabling & DIP SW setting
1). Loose the 3(three) socket-head cap screws of back cover and separate the back cover
from the middle cover, as follows.
At this time, the internal connection harness (connecting the internal circuit boards)
may be inevitably removed.
Figure 2. Removing the back cover
Figure 3. Arranged for wire cabling
2). If you need to change the sensitivity & any other user selectable settings,
change it, refering to Table 2. DIP Switch Setting.
3). Connect(plug) the external cable wires into the relevant positions of terminal block on
the connection PCB ,referring to the wiring configuration, as shown in Table 3.
(Output Interface of Connection PCB).
4). After completion of internal wires connection, make sure to secure tightly the relevant
Ex-proof cable gland into the Back Cover for ultimate water proof.
DIP Switch (in 8 positions)
*Adjustable as required.
Connection Harness
ositions)

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Figure 4. Connecting Wires & Securing the cable gland
5). Plug the end of removed connection harness first into the relevant connector on PCB of
middle cover and then, into the relevant connector on PCB of back cover.
6). Pull the back cover into middle cover to combine these both covers
*Make sure to SECURELY plug each ends of connection harness to each connectors
inside both covers. If not securely done, both PCBs would be disconnected.
Figure 5. Assembling & Combining the covers
7). Screw up the 3(three) socket-head cap screws of back cover to combine the back
cover with the middle cover.
Make sure that this screwing-up be done SECURELY and, otherwise, the detector may
fail to meet the waterproof.
Secure tightly for
water-proof
(*Optional)
Connection Harness
positions)
Middle Cover
Back Cover
Secure tightly the
3 fasteners for
water-proof

User Guide of ZT-20EX & ZT-500EX
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3 Installation
The detector can be mounted on the wall with either of two kinds of Swivel
Mounts, (TM-AL10 in aluminum and TM-ST10 in SS316) which are optionally
selectable by customers when ordering the detector.
Figure 6. Swivel Mount (TM-AL10)
Figure 7. Swivel Mount (TM-ST10)
Figure 8. Installed Detectors on wall
1). Place the Swivel Mount in its designated location on the wall and secure it with the
provided four (4) fasteners through four (4) holes of dia. 5.0 or 6.0mm.
2). Put the mounting pole of detector into the mounting hole of Swivel Mount and
secure the detector by screwing the locking screws on Swivel Mount.
3). Release the locking screws on Swivel Mount in such a way that allows rotating the
Detector which is combined the mounting hole of Swivel Mount.
Point the detector towards the protected area and make certain that the view of

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the area is unobstructed. Secure the detector in that position by tightening the
locking screws on the Swivel mount.
The detector is now correctly located, aligned and ready to be connected to the system.
4 Operation
Once powered up, the detector will begin appr. 20 sec start-up routine.
During this time, all three (3) LED indicators will be blinking.
Once the start-up procedure has finished and no faults are present, the detector will
begin Normal operation (Green LED will remain on).
Table 1. Output Signals/LED Indications versus Detector State
Detector Status
Green
LED
(Power)
Red LED
(Alarm)
Yellow
LED
(Fault)
4-20mA
Output
Power up –20 second start
delay
Blinking
2 mA
Internal Power Fault or system
power out of range / Fault
Off
Off
Blinking
0 mA
Normal Operation
Solid
Off
Off
4 mA
Fire Detection(Warning)
Off
Solid
Off
16 mA
Fire confirmed
All LEDs blinking simultaneously
20 mA

User Guide of ZT-20EX & ZT-500EX
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Table 2. DIP Switch Settings
Notes:
(1). The detector offers four (4) sensitivity settings. The settings refer to the n-Heptane
fire of 1ft-sq.
(2). When an Alarm (Detection) level condition is encountered, the detector delays the
execution of the Alarm output relay by the specified period of time. The detector will
then, additionally, evaluate the fire condition during the specified Alarm Delay Time.
If the Alarm level is still present, the Alarm outputs will be activated. If this condition
no longer exists, the detector will return to its standby state. The LED will indicate
warning level during the delay time only if the fire condition exists.
(3). The detector has a selectable latched alarm output capability, which operates
according to the selectable function. If selected, upon the detection of a fire, the
detection signal is latched until manually reset (disconnecting the power supply or
DIP Switch Position No.
Mode Selections
1
2
3
4
5
6
7
8


Sensitivity Range (1)
OFF-OFF(00) : Highest
OFF-ON(01) : High
ON-OFF(10) : Medium<default>
ON-ON(11) : Low


Alarm Delay Time (2)
OFF-OFF(00) : 1 sec
OFF-ON(01) : 3 sec
ON-OFF : 5 sec
ON-ON : 7 sec<default>

Alarm Latch Setting (3)
OFF(0) : 20 sec<default>
ON(1) : until reset

Reserved (for design setting)
OFF(0) : <default>

Reserved (for design setting)
ON(1) : <default>

Alarm Relay Setting (4)
OFF(0) : N.O<default>
ON(1) : N.C
1 2 3 4 5 6 7 8
:ON “(1)”
:OFF ”(0)”
ON
(OFF)

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performing a manual BIT). Latching affects the ALARM RELAY, 4-20mA output, the
ALARM LED.
(4). The detector has a selectable option over alarm relay initialization between normally
open, N.O. (as Default) and normally closed, N.C.
Table 3. Output Interface of Connection PCB