EsiWelma Srl
URD20SS_en.doc - rev. 0
CO
2
gas detectors – URD20SS
24/09/2010
Gas detection systems for industrial environments
2/8
Technical
characteristics
Type of sensor
NDIR (nondispersive infrared)
Detectable Gas
Carbon dioxide (CO
2
)
Power supply
11÷28Vdc
Max power consumption
3.2W
Measuring range
0...20,000 ppm
Precision
±
5% full scale,
±
10% readout
Repeatability
±
5% full scale,
±
10% readout
Measurement resolution
20 ppm
Microprocessor resolution
1024 points (10 bit)
Digital filter system
Kalman Filter
Watchdog Internal
Warm-up time
< 2m
Stabilization time
< 2m
Response time
< 25s (T90)
Average Sensor life (in air)
255 weeks
4..20mA Output
Proportional mode
(default)
Consumption mode
(applications at 1 or 2
thresholds)
4…20mA Output reference
selection:
- 4mA = 0 ppm
- 20mA = 20000 ppm
- 0mA = no alarm
- 10mA = 1
st
threshold alarm
- 20mA = 2
nd
threshold alarm
by jumper selectable polarity
4…20mA output load resistor
- up to 200
Ω
at 12Vdc power supply
- 200
Ω
÷
700
Ω
at 24Vdc power supply
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 energised
Dimensions and weight
See dedicated section
Options & Accessories
Card with 4 SPDT relays
UZR20.4
NO or NC contacts available,
jumper selectable
See threshold limit settings
Maximum relay capacity:
50mA at 24Vac/dc, 100mA at 12Vac/dc
-
direct: relay ON when an event is
detected
-
reverse: relay ON when no event is
detected
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
BVI 07 ATEX 0033
-20°C
≤
T
A
≤
+50°C
