Navim Group Company EsiWelma Sensigas UCE1 User manual

EW089.309_en –rev.B
Gas detection Control Unit –UCE1
27/04/2021
Gas detection systems for industrial environments
1 of 4
Sensigas®
UCE1
Gas detection control unit
MED/3.54 (IEC 60092-504) certified
Installation instructions
GENERAL
The UCE1 control unit can be used to connect one detector (model
URx13 or URx20/21..) to create gas detection systems in
environments such as boiler rooms, workshops, warehouses,
laboratories etc.; the incorporated alarm relay can be used to
control a solenoid valve or an accessory device (siren, flashing
light, extractor, etc.). The installation of a gas or carbon monoxide
detection system does not constitute a release from compliance
with all regulations for the installation and use of gas devices and
with the relative safety standards and legal provisions in force for
this kind of system. Installation, periodic inspections and
maintenance of devices and systems must be carried out by
qualified service technicians.
TECHNICAL SPECIFICATIONS
UCE1 control unit (data URx20/21.. detectors in brackets)
Power supply: 12 Vac/dc 10%
Consumption: about 160mA (320mA) with the detector only
460mA (620mA) with detector and failure
output
Connections: two terminals of 2.5 mm2
Protection: Power input fuse 1A 5x20mm
Inputs: one, for UGR13, URP13, URO13 detectors, or
URx20/21.. detectors (different types of gas)
Detector connection: three terminals of 2.5 mm2:
C (-12...24V); S (+4…20mA); A (+12...24V)
Max cable run length: 50 m
Diameter of the 3 wires: 1.5 mm2
Alarm output: 1 relay with one contact SPDT 8A 250Vac
Failure output: one open collector 12Vdc / 300mA max
Output connections: three terminals of 2.5 mm2for C-NC-NO relay
two terminals of 2.5 mm2for open collector
Visual alarms: 1 green LED: power on
1 yellow LED: failure
1 red LED: gas alarm
Audible alarms: 1 buzzer noise level > 60db at 1m
“Reset/Test” button: 1 for alarm Reset and detector Test
Enclosure: RAL7035 grey, self-extinguishing plastic house
Dimensions and weight: 105x90x58 mm (6 modules to standard DIN
43880), 185 g
Mounting: Back panel Omega DIN rail (EN 50022)
Protection rating: IP20; IP40 when correctly installed in
electric panel
Room temperature: -20…+55°C
Humidity 90% RH (non condensing)
Conformity 0474 / xxxx (manufacturing year)
CERTIFICATE n. MED327120CS
MED Directive / Standards MED 2014/90/EU / IEC 60092-504
EMC Directive / Standards EMC 2014/30/EU / EN50270 / EN 61326-1
LVD Directive / Standards LV 2014/35/EU / EN60730-1
Product Standard EN60079-29-1
URx13 (URx20/21..) detectors
Power supply: from the UCE1 control unit
Consumption: 40 mA (200mA)
Connections: three terminals of 2.5 mm2:
C (-12...24V); S (+4…20mA); A (+12...24V)
URx13 models: Methane Gas URG13
LPG URP13
Carbon Monoxide URO13
URx20/21.. models: Various gases, see dedicated data sheet
Calibration: URG13: 10% LEL of Methane
URP13: 12% LEL of LPG
URO13: 200ppm of CO
(URx20/21..: 20% LEL, 100ppm CO)
Enclosure: self-extinguishing plastic
Dimensions and weight: 66x90x45 mm (depending on model), 65 g
Mounting: wall-mounted using plastic screws and anchors
Protection: IP44 (IP44, IP55 or IP65 depending on model)
Room temperature: 0…+50°C (-20…+50°C till -40…+70°C)
Humidity: 90% RH (non condensing)
LVD Directives/Standards Not applicable
EMC Directives/Standards EMC 2014/30/EU / EN50270
Other features of URx20/21.. detectors
See their technical features on dedicated data sheet.
INSTALLATION
MOUNTING
Ensure correct environmental conditions (See Technical
Specifications).
UCE1 control unit
To guarantee the correct protection rating for the device it must
be installed in an electric panel manufactured according to the
laws in force for workplaces and that can also house the power
supply system. Mount the control unit on a rail (to DIN EN
50022), using accessories for standard electric panels. It can be
installed on a mounting plate or in DIN rail modules.
URx13 (URx20SW) detectors
To be used for wall-mounting (vertical), attached by plastic
screws and anchors. To install, insert a screwdriver in the recess
at the bottom of the enclosure to open it; avoid damage to the
sensor and do not touch the calibration devices. The detectors
must be correctly positioned for the system to operate properly.
For this purpose, the control units must be installed:
-in zones with constant natural air circulation
-in zones free of dust and dirt that could clog up the sensor and
make it ineffective
-never near running water, exhaust vents, windows, openings
etc.
-at a suitable distance from the gas-fuelled equipment to avoid
the system taking inappropriate action due to possible
functional loss.
The positioning also depends on the type of gas that is to be
detected, in particular:
-URG13: Methane gas - high, about 20-30 cm from ceiling
-URP13: LPG - low, about 20-30 cm from floor
-URO13: CO - about 1.5 m from floor
For new plants, the detector must be installed at the last possible
moment so that typical worksite activities (particularly welding,
painting, sealing etc.), do not damage the actual detector
(particularly the sensing element).
URx20/21.. detectors
See installation instructions on dedicated data sheet.
ELECTRICAL CONNECTIONS
Normal electric cables can be used. Still, if detectors are to be
installed in environments with high exposure to EMI, it is
advisable to use shielded cables. The detection system must
always be operating, so power switches or other devices that
could inadvertently make the detector inoperative must not be
used. Do not touch the sensing element and the electronic circuits
for any reason whatsoever. Tampering of any kind may cause the
system to operate incorrectly.
Ensure compliance with all current electric standards.

EW089.309_en –rev.B
Gas detection Control Unit –UCE1
27/04/2021
Gas detection systems for industrial environments
2 of 4
UCE1 control unit
The control unit must be powered at 12 Vac/dc; use transformers
with double insulation, sized for uninterrupted use for the power
utilised (See Technical specifications).
For connecting the relay output use wires with a minimum
diameter of 1.5 mm2.
Prepare wiring connections according to the electrical diagrams
contained in these instructions.
URx13 or URx20/21.. detector
Prepare wiring connections according to the electrical diagrams
contained in these instructions, using wires with a minimum
diameter of 1.5 mm2for a maximum length of 50 m.
COMMISSIONING
The UCE1 control unit and the URx13 or URx20/21.. detectors are
safety control devices, therefore they must not be tampered with;
do not touch the sensor or the electronics for any reason
whatsoever. Carry out the following controls:
-the power supply for the control unit must comply with the
values provided (12 Vac/dc 10%)
-make sure the power consumed by any device connected to the
relay terminals is below or the same as the maximum capacity
of the contacts (See Technical specifications)
-make sure the consumption of any device connected to the
open collector output terminals is below what is declared in the
technical data
-the detector must be compatible with the type of gas to
monitor and correctly connected to the control unit.
Depending on the type of detector to connect it is necessary to
position jumpers E5 and E6 as follows:
-the operating mode (positive or negative logic) selected must
be consistent with the system choices. As regards this, check
the position of Jumper E1 (See Operation)
-the operating mode selected for the relay must be consistent
with the system choices. As regards this, check the position of
Jumper E2 (See Operation)
-test the gas alarm and the detector failure condition events
(See Operation).
OPERATION
The Jumper E1 can be used to select the operating mode (positive
or negative logic).
The control unit signals its operating status through LEDs.
Depending on the operating mode selected through Jumper E1, in
a normal situation (no alarm), the LEDs, the OC output and the
relay are as follows:
positive operating logic: LEDs on; relay energised, OC output =
ON
negative operating logic: LEDs off; relay de-energised, OC
output= OFF
If the negative operating logic is selected, the alarm relay can be
permanently or impulse controlled, depending on the position of
Jumper E2:
Once the correct power is supplied, the control unit carries out the
following phases in sequence:
LED and buzzer tests (about 5 seconds)
Whichever operating mode is selected, the LEDs will switch on in
sequence and the buzzer will sound briefly.
Warm-up of detector (about 3 minutes)
During this phase, which brings the detector up to the correct
operating temperature, the gas detection system is not
operational. During this phase, if the wiring connections are
correct, the control unit display shows the following:
Operating test (about 3 minutes)
Once the detector warm-up phase is complete, the device enters
the operating test phase. During this phase, all internal timing is
reset to ease operating verification of the detector (alarm
simulation). In this case, the control unit display shows the
following:
Keep the “Reset/Test” button pressed down for over 1 second to
interrupt the operating test phase. To test the detector correctly,
proceed as follows:
Gas alarm test:
Bring the test cylinder close to the detector grille and release a
small amount of gas (caution: if the gas is aimed directly at the
sensor, this will be permanently damaged). For CO testing of
detector, smoke produced by combustion can be used. The control
unit will signal the alarm as follows:
Keep the “Reset/Test” button pressed down for 1 second to
silence the alarm (if there is no gas remaining) and terminate the
operating test phase. To restart the Test phase, just keep the
relative button pressed down for about 6 seconds.
Caution The repeated use or high concentration of
interfering substances (alcohol, lighter fluid etc.)
can cause permanent damage to the sensor and
put the device out of order.
Interface
Positive logic
Negative logic
Power supply LED
Green
Flashing 1 Hz
Flashing 1 Hz
Failure LED
Yellow
On
Off
Gas alarm LED
Red
On
Off
Alarm buzzer
No sound
No sound
Alarm relay
Energised
De-energised
Failure output
On
Off
Interface
Positive logic
Negative logic
Power supply LED
Green
Flashing 2 Hz
Flashing 2 Hz
Failure LED
Yellow
On
Off
Gas alarm LED
Red
On
Off
Alarm buzzer
No sound
No sound
Alarm relay
Energised
De-energised
Failure output
On
Off
E2
A
B
E2
A
B
E2
A
B
Posizione A Relè di allarme Comando permanente
Posizione B Relè di allarme Comando impulsivo
E1
A
B
E1
A
B
E1
A
B
Posizione A Logica positiva
Posizione B Logica negativa
E2
A
B
E2
A
B
E2
A
B
E2
A
B
E2
A
B
E2
A
B
Posizione A Relè di allarme Comando permanente
Posizione B Relè di allarme Comando impulsivo
E1
A
B
E1
A
B
E1
A
B
E1
A
B
E1
A
B
E1
A
B
Posizione A Logica positiva
Posizione B Logica negativa
Interface
Positive logic
Negative logic
Detector alarm LED
Red
Off
On
Alarm buzzer
Continuous sound
Continuous sound
Alarm relay
De-energised
Energised
(permanently or
pulsed depending
on E2)
Failure output
Off
On
E3
A
B
E6
Posizione (default)
per Sonda URx13
E5 E5
Posizione per
Sonda URx20..
E6
E3
A
B
E3
A
B
E6
Posizione (default)
per Sonda URx13
E5
E3
A
B
E3
A
B
E6
Posizione (default)
per Sonda URx13
E5 E5
Posizione per
Sonda URx20..
E6
E3
A
B
E5
Posizione per
Sonda URx20..
E6
E3
A
B
E3
A
B
(default) position of
detector URx13
position of detector
URx20/21..
Position A Positive logic
Position B Negative logic
Position A Alarm relay Permanent control
Position B Alarm relay Pulse control

EW089.309_en –rev.B
Gas detection Control Unit –UCE1
27/04/2021
Gas detection systems for industrial environments
3 of 4
Detector failure test
Simulate a failure in the detector as follows:
-disconnect the cable of the detector and verify the following
alerts:
-reconnect the detector and press the “Reset/Test” to return the
control unit to normal operating mode, making the sure the
conditions of the various interfaces are reset
Normal operation
This is the normal operating phase of the control unit during which
both gas alarm monitoring and self-testing of the instrument
(detector) and the system (control unit) are active. During this
phase, where there are no alarms and/or abnormalities, the
control unit display shows the following:
When dangerous concentrations of gas are detected, the control
unit enters the gas alarm phase and carries out the following
operations:
Once the gas alarm condition is normalised, the control unit needs
to be reset to its normal operating status. Press the “Reset/Test
button on the front of the control unit to reset it.
If there are abnormalities (detector and/or control unit), the
control unit will show the following display:
Once the failure is fixed, the control unit needs to be reset to its
normal operating status. Press the “Reset/Test button on the front
of the control unit to reset it.
Caution: it is advisable to repeat the operating test at least
once a year, or after a prolonged period of
stoppage and in any case, every time the detector
is replaced.
Caution The average lifetime of the URx13 and
URx20/21.. detectors is 5 years from installation
date. They must be replaced before the end of
the 5th year of use. The average lifetime of
detectors is calculated for use in a typical
environment, normally free from polluting agents
(gases, solvents etc.). More frequent and higher
concentrations of these substances can
accelerate the normal oxidisation process of the
sensing element, subsequently shortening its
lifetime.
GAS ALARM
If an alarm signals a gas leak or the presence of carbon
monoxide, proceed as follows:
-put out flames and switch off all gas equipment
-do not for any reason switch on or off lights or any electrical
equipment
-open doors and windows to air the environment
-look for and eliminate the cause of the alarm. If this is not
possible, leave the building and contact emergency services
from outside.
ENVIRONMENTAL COMPATIBILITY AND DISPOSAL
This product has been designed and constructed
using materials and processes that take into account
the environmental issue. Refer to the following notes for disposal
of the product at the end of its working life, or when it is replaced:
-for disposal purposes, this product is classified as an electric
and electronic device: do not dispose of it with normal
household waste, in particular as regards the printed circuit
-comply with all local laws in force
-as far as possible reuse basic materials to keep environmental
impact to a minimum
-use local depots and waste recycling companies, or contact the
supplier or manufacturer to return used products or to ask for
information on environmental compatibility and waste disposal
-the product packaging can be reused. Keep it for future use or
to return the product to the supplier.
TROUBLESHOOTING
Problem
Possible cause
NC valve does not open
-Valve not connected
-Alarm in progress
-Detector warm-up phase in
progress
-Defective detector
-Presence of failure
NO valve does not close
-Valve not connected
-Connection cables cut
-No alarm active
“Reset/Test” button does not
reset to initial conditions
-Alarm in progress
-Failure occurring in control
unit
Sensor in alarm immediately
after the end of the preheating
phase
During the preheating phase,
the sensor did not reach
thermal stabilization.
Wait further minutes and then
reset the alarm with the "Reset
/ Test" button
Interface
Positive logic
Negative logic
Detector Failure LED
Yellow
Off
On
Alarm buzzer
Intermittent
sound
Intermittent sound
Failure output
Off
On
Interface
Positive logic
Negative logic
Power supply LED
Green
On
On
Failure LED
Yellow
On
Off
Gas alarm LED
Red
On
Off
Alarm buzzer
No sound
No sound
Alarm relay
Energised
De-energised
Failure output
On
Off
Interface
Positive logic
Negative logic
Detector alarm LED
Red
Off
On
Alarm buzzer
Continuous
sound
Continuous sound
Alarm relay
De-energised
Energised
(permanently or
pulsed depending
on E2)
Failure output
On
Off
Interface
Positive logic
Negative logic
Failure LED
Yellow
Off
On
Alarm buzzer
Intermittent
sound
Intermittent
sound
Failure output
On
Off

EW089.309_en –rev.B
Gas detection Control Unit –UCE1
27/04/2021
Gas detection systems for industrial environments
4 of 4
TERMINAL BOARD
+(TB1) Power supply 12 Vac/dc (positive)
-(TB1) Power supply 12 Vac/dc (negative)
+(TB3) OC output 12 Vac/dc (positive)
-(TB3) OC output 12 Vac/dc (negative)
CAlarm Alarm relay output (common)
NC Alarm Alarm relay output (Normally Closed contact)
NO Alarm Alarm relay output (Normally Open contact)
URx13 detector connections
CDetector input (C, common)
S Detector input (S, signal)
A Detector input (A, power supply 6.5V)
URx20/21.. detector connections
CDetector input (+12...…24V, negative power supply/signal)
SDetector input (+4...…20mA, positive signal)
ADetector input (+12…...24V, positive power supply/signal)
DESCRIPTION GAS DETECTION CONTROL UNIT
1 TB1 - Power supply terminals 12 Vac/dc
2Protection fuse 1A
3TB3 - “Failure” open collector terminals
4TB2 - “Alarm” relay terminal block
5LED signalling presence of current
6LED failure alert
7Gas alarm LED alert
8Reset/Test button
9TB4 - Gas detector connection terminals
10 Jumper E5E6 for configuration of detector inputs:
E5 - Sel. power supply: A=6.5V (URx13), B=12V (URx20/21)
E6 - Sel. input A=(URx13), B=4..20mA (URx20/21)
11 Set-up jumper:
E1 –operating mode
E2 –Alarm relay operating mode
E3 –selection detector type: omitted=URx13, A=URx20/21
E4 –available
12 Connector P1 (communication –not used)
13 CN1 connector and service Jumper J1
CONNECTION DIAGRAMS
Control unit with NO solenoid valve, negative mode.
N1 UCE1 control unit
B1 URx13 or URx20/21.. detector
Y1 NO gas solenoid valve (Vaux: 24230Vac)
L1 Failure alert device (12 V/300 mA max)
DIMENSIONS
UCE1 control unit
URx13 (or URx20SW) detectors
URx20/21.. detectors
Depending on model (see dedicated technical data sheet).
Installation data
Installer's stamp
Control unit installation date:
Detector replacement date:
Notes: Due to our policy of continuous product improvement, specifications
are subject to change without notice.
58
48
33
105
90
62
45
TB1 TB2
TB3
58
48
33
105
90
62
45
TB1 TB2
TB3
66 45
90
66 45
90
+
-
NO
C
S
A
C
NC
TB2
TB1
TB4
Allarme
+
-
TB3
+
-
NO
C
NO
C
S
A
C
NC
TB2
TB1
TB4
Allarme
+
-
TB3
Alarm
+S A
C
-NO
C
NC
S A
C
B1
12 Vac/dc
12 Vac/dc
N1
Y1
Vaux
Vaux
Allarme
+ -
L1
-12…24V
+4…20mA
+12…24V
URx20..
URx13
+S A
C
-NO
C
NC
S A
C
B1
12 Vac/dc
12 Vac/dc
N1
Y1
Vaux
Vaux
Allarme
+ -
L1
-12…24V
+4…20mA
+12…24V
URx20..
URx13
12 3
11 910
12
8
5
6
7
13
4
11 22 33
11 9910
12
88
55
66
77
13
44
Alarm