EW146691_en - rev. A
Gas Detectors
–
UR.21.P
02/04/2020
Gas detection systems for car parks and tunnels
3/8
Technical characteristics
(continued)
4 Relay SPDT Card
UZR20.4
It is used to activate signals and/or
external systems (light signals, sirens,
ventilation systems, etc.).
NO or NC contacts available, selectable
by jumpers.
N. 4 LEDs are presente and associated
with the status of each Relay and
separate quick-connecting term. blocks
The state of the LEDs is directly
associated with the status of the relative
Relay: Relay X "On" => Led X "On".
Relay contact range:
Relay control logic:
PhotoMOS Card
UZS20..
It is used to indicate the status of the
detector
through
a
resistive
value
presented at the terminals.
It is typically used in conjunction with
modules that put on the LOOP peripheral
fire alarms that have a behavior similar to
that of smoke detectors.
Verification and Calibration Kit
TUS40..
Service and Maintenance Terminal
with Interface Board
UIC20
.
Replacement Sensor Body
NRXX-Y-ZZZ
Sensor body complete with relevant signal
conditioning card.
(default values for explosion gas and CO)
Relay A: Pre-alarm
(10% LEL, 50 ppm)
Relay B: 1
st
Thresh. Alarm
(20% LEL, 100 ppm)
Relay C: 2
nd
Thresh. Alarm
(40% LEL, 200 ppm)
Relay D: Detector Fail
Alarm intervention thresholds can be reset by dip-
switch (12 combinations) or by service and
maintenance terminal or display.
50mA @ 24Vac/dc, 100mA @ 12Vac/dc
-
Direct: Relay ON in the presence of an event;
-
Inverse: Relay ON in the absence of an event.
UZS20.E
Normal Pre-Al 1
st
Th 2
nd
Th Fail
22k
10k
2,2 k
n.p. Open
UZS20.A
Normal Pre-Al 1
st
Th 2
nd
Th Fail
27k
n.p. 10k
n.p. Open
UZS20.S
Normal Pre-Al 1
st
Th 2
nd
Th Fail
2,2k
n.p. Close n.p. Open
See Chapter for Commissioning and Start-up.
See dedicate price list.