Navim Group Company EsiWelma Sensigas URS40SS User manual

EW0526A4_en - rev. A
Oxygen detectors –URS40SS
05/10/2020
Gas detection systems for industrial environments
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Sensigas®
Oxygen detectors
ATEX II 3G Ex nA nC d IIC T6 Gb certified
URS40SS
Sssssss
11…14Vdc power supply.
Electrochemical cell sensor designed for the detection of oxygen (O2).
Up to three alarm thresholds plus sensing element fail.
LED on sensing element body to indicate operating status.
Automatic countdown of sensor life.
Use
The URS40SS detectors are used to detect oxygen excess or deficiency in hazardous
(classified) areas of industrial environments and thermal power stations.
An oxygen excess forms if it leaks in hospitals, laboratories, welding centres and, more
in general, where oxygen is stored.
Oxygen deficiency is an indirect measurement of the presence of other explosive or
asphyxiant gases that deplete the oxygen in the air.
URS40SS detectors transmit data from a local bus connected with their Control Unit,
which acts as the master unit of the gas detection system.
Operation
If there is an oxygen leak or an absence of oxygen, the detector compares the measured
concentration value with the threshold limit setpoints and energises the system relays if
associate.
Alarm information is transmitted to the Control Unit, which energises its own internal
relay module (MR0) and the remote Relay and Display modules depending on the
associations.
Ordering
To order, simply state the part number: URS40SS.
For special versions, on request, please contact Customer Service.

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Oxygen detectors –URS40SS
05/10/2020
Gas detection systems for industrial environments
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Technical
characteristics
Type of sensor
Electrochemical cell
Detectable Gas
O2 excess
O2deficiency
Power supply
11÷14Vdc
Max power consumption
0,7W
Measuring range
0…30% O2
Precision
2,5% of full scale range (in air)
Repeatability
2,5% of full scale range
Measurement resolution
0.1% O2
Microprocessor resolution
1024 points (10 bit)
Digital filter system
Kalman Filter
Watchdog
Internal
Warm-up time
< 2m
Stabilization time
< 2m
Response time
< 10s (T20), < 45s (T90)
Average Sensor life (in air)
120 weeks
Threshold limit settings
(default setting): Pre-alarm
1st threshold alarm
2nd threshold alarm
22% O2
23% O2
24% O2
19% O2
17% O2
15% O2
Operating Temperature
Storage Temperature
-20 50 °C
-20 70 °C
Relative Humidity (without condensing)
-Operation
-Storage
15 90 %RH
45 75 %RH
Operating pressure (KPa)
80 110
Air speed (m/s)
6
Visual warnings
Red LED visible with detector energized
The steady LED status can be forced by the
Control Unit to identify the sensor on the plant
Dimensions and weight
See dedicated section
Options & Accessories
TUL40.. Gas calibration kit
See installation and commissioning chapter
TUS40 Handheld terminal
for service and maintenance
See installation and commissioning chapter
CRG40 Gas collecting cone
See dedicated data sheet
PAP40 Powerful jets protection
See dedicated data sheet
ATEX markings
II 3G Ex nA nC d IIC T6 Gb
BVI 07 ATEX 0033
-20°C TA+50°C
Key to marking
information
Marking in conformity with all applicable EC Directives
Marking for all equipment in conformity with Directive ATEX 2014/34/EC
II Equipment Group for surface industry
3 Equipment category 3 for use in Zone 2
GEquipment intended for use in explosive gas atmosphere, caused by mixture
of air and gas, vapours, flammable mist
Ex nA nC d IIC T6 Gb Types of protection complying with EN60079-0 and
EN60079-15,
sensor body with type of protection d in compliance with
EN60079-1
BVI 07 ATEX 0033 Type examination certificate
-20°C TA +50°C Operating temperature range
Sensors lifetime
Sensor average lifetime (see technical characteristics) is referred to a typical usage in
a pollution-free environment. Presence of a high concentration of pollutants can
shorten the lifetime of the sensing element.
Once the detection system starts up, it has to be supplied with energy during all the
lifetime of its sensors. Seasonal use of the detection system is not recommended.

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Oxygen detectors –URS40SS
05/10/2020
Gas detection systems for industrial environments
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Mechanical
Installation
Oxygen excess
Since oxygen weighs more or less the same as air, unless there is forced or natural air
circulation, it tends to spread at the point of the leak.
So, the excess oxygen detectors must be installed near any likely leakage points, in order to
detect the excess oxygen as quickly as possible.
Oxygen deficiency
Detection of oxygen deficiency has the purpose of indirectly detecting the presence of other
gases that deplete the oxygen in the air, therefore causing asphyxiation problems, for example.
In this case, the detectors must be located at the breathing height of the occupants in the
premises. Take into consideration the following specific installation guidelines, as well as the
above instructions, for location of the detectors.
The detectors must be installed:
1. where accidental gas leakages are possible
2. at least 1.5m away from heat sources or from vent holes
3. not in spaces where ventilation is poor and where gas pockets may form
4. away from hindrances to natural gas flow
5. away from equipment that may leak gas during normal operations
6. in environments with a temperature range of -20°C to 50°C and relative humidity below
90% (non-condensing)
7. Disconnect equipment from the power supply when mounting and dismantling detectors.
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.
Electrical installation
and configuration
Terminal board and
electrical connections
Cabling:
CAUTION: Make the area safe and ensure that the device power supply is off
before cabling and configuration operations.
Install the sensor in compliance with EN60079-14.
The cable gland provided on the housing is used for cable entry. The diameter of the cable
sheath must be no more than 8 mm.
Ground the sensor using the internal grounding system.
Refer to the Control Unit manual for all cabling information (cable type and specifications, bus
topology, length of connections etc.) and configuration.
Depending on the connecting distance, use at least 4-core cable, min. diameter 0.75mm2up to
100m, 1mm2up to 200m, 1.5mm2up to 500m.
Use shielded cable where there is a risk of electromagnetic interference.
Grounding connection
Termination jumper
Configuration key
Cable
connection
Status LED
Sensing element
Power supply
and BUS
connector
12Vdc Power Supply Input
BUS Input
12V
‒+-
BUS
Shield
BUS
‒+-

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Oxygen detectors –URS40SS
05/10/2020
Gas detection systems for industrial environments
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Checklist after
mechanical and
electrical installation
Before using the sensor it must be recognised by the Control Unit through an assignment
operation (refer to the manual of the aforesaid Control Unit for correct execution).
The sensors are factory calibrated so they normally do not require any other calibration
once installed. Still, after installation, an operational check of the sensors is
recommended.
The status LED means the following:
•Flashing at 2Hz NOT ASSIGNED
•Flashing about every 10 sec ASSIGNED AND WORKING
•Steady ALARM
Maintenance
Routine
Corrective
Decommissioning
A sensor functional test should be carried out every three-six months.
Routine maintenance involves repeating the same tests as set forth in “checklist after
mechanical and electrical installation”.
If any abnormalities are found during routine sensor maintenance, return the sensor
concerned to the supplier / installer, who in turn will send it back to the manufacturer.
Sensors may need to be re-calibrated, using the TUL40.. calibration kit and the
TUS40-40 handheld terminal, which must be connected to the sensor via the
communication on the Power supply and BUS connector.
For the re-calibration procedure, see the instructions supplied with the handheld
terminal.
Remove power from the detector, disconnect all wiring and conduits and dismount
the housing from all the blocking systems.
Warranty
Warranty on EsiWelma products is valid for 12 months from installation date and no
longer than 24 months from manufacturing date on the product. Installation data,
stamp and signature on the data sheet filled in by the installer will be considered proof
for warranty.
A copy of the warranty data sheet must be sent when returning the product under
warranty.
Accessories
TUL40.. Gas calibration Kit
TUS40 Handheld terminal
CRG40 Gas collecting cone
PAP40 Powerful jets protection
Dimensions and weight
Dimensions (HxWxD): 155x100x60mm. Weight: 0.65Kg
Due to our policy of continuous product improvement, specifications are subject to change without notice.