EsiWelma Sensigas URS40SL User manual

EsiWelma Srl URS40SL_en.doc - rev. 0 Oxygen detectors – URS40SL
11/04/2011 Gas detection systems for industrial environments 1/4
Oxygen detectors
IP55 protection rating
URS40SL
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 URS20SL detectors are used to detect oxygen excess or deficiency in non-
classified areas.
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.
URS20SL 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: URS40SL.
For special versions, on request, please contact Customer Service.

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Technical
characteristics
Type of sensor Electrochemical cell
Detectable Gas O
2
excess O
2
deficiency
Power supply 11÷14Vdc
Max power consumption 0,7W
Measuring range 0…30% O
2
Precision ±5% full scale, ±10% readout
Repeatability ±5% full scale, ±10% readout
Measurement resolution 0.1% O
2
Microprocessor resolution 1024 points (10 bit)
Digital filter system Kalman Filter
Watchdog Internal
Warm-up time < 2m
Stabilization time < 2m
Response time < 20s (T50), < 60s (T90)
Average Sensor life (in air) 120 weeks
Threshold limit settings
(default setting): Pre-alarm
1
st
threshold alarm
2
nd
threshold alarm
22% O
2
23% O
2
24% O
2
19% O
2
17% O
2
15% O
2
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
EC Conformity
EMC Directives / Standards
LVD Directives / Standards
Electromagnetic Compatibility Directive
EMC 2004/108/EC, Standard EN50270
Not applicable
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.
Seasonal use of the detection system is not recommended.

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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.
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 laws in force.
The cable gland provided on the housing is used for cable entry.
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
0.75mm
2
up to 100m, 1mm
2
up to 200m, 1.5mm
2
up to 500m.
Use shielded cable where there is a risk of electromagnetic interference.
12 Vdc power supply input
BUS input
BUS
Shield
- + - +
BUS 12V
- + - +
BUS 12V
- + - +
BUS 12V
Grounding connection
Termination jumper
Configuration key
Cable
connection
Status LED
Sensing element
Power supply
and BUS
connector

EsiWelma Srl URS40SL_en.doc - rev. 0 Oxygen detectors – URS40SL
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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): 130x100x60mm. Weight: 0.5Kg