Gas detector in metal housing (Group II protection mode, category 3G, Ex nA IIC T6) with
operating status indicator light, for indicating gas alarms by means of a 4-20 mA analogue
output or a trip threshold (pre-alarm, level 1 and 2 alarm, fault) that can be freely set with DIP
switches. Power supply: 11-28 VDC. Signal output: 4-20 mA. An explosion-proof version is
available to order, marked with the ATEX hexagon symbol and designation II 2G, Ex d IIC T6.
Compliant with Directives EMC 2014/30/EU and ATEX 2014/34/EU.
II 3G, Ex nA IIC T6.
UR20S
Type
Part No.
DN
Protection
Weight (Kg)
UR20S
0940571
NATURAL GAS
IP55
0.65
UR20S
0940572
LPG
IP55
0.65
UR20S
0940573
CO
IP55
0.65
UR20S Series
gas detectors are used for detecting inflammable or toxic gases in classified areas in industrial environments
and boiler rooms. All models can be used with
CIVIC1 Series
control units (one sensor) and
CIVIC4
Series
control units (up
to 4 sensors) or with other control units set up to receive a 4-20 mA signal (generally combined fire/intrusion detection systems).
Description
Technical features
Natural gas and LPG
Carbon monoxide
Sensor type
Standard catalytic, pellistor
or semiconductor
Electrochemical cell
or semiconductor
Power supply
11-28VDC
11-28VDC
Maximum power consumption
3.2 W
1.5 W
Measuring range
0-100% LEL
0-500 ppm
Precision (excluding semiconductor)
+ 5% of full scale, + 10% of reading
Precision (semiconductor)
+ 10% full scale (at setpoint)
Measurement resolution
1% LEL
5 ppm
Microprocessor resolution
1024 pixels (10 bit)
1024 pixels (10 bit)
Safety circuit
Internal watchdog
Warm-up time
< 2 mins.
< 2 mins.
Stabilisation time
< 2 mins.
< 2 mins.
Maximum response time
< 20s (T50), < 60s (T90)
Average service life of sensor in air
255 weeks
255 weeks
4
-
20 mA output signal:
Proportional output signal
4mA = 0% LEL
4mA = 0 ppm
(default)
20mA = 100% LEL
20mA = 500 ppm
Threshold-based output signal
0mA = no alarm
0mA = no alarm
(applications with 1 or 2 thresholds)
10mA = 1st threshold = 20% LEL
10mA = 1st threshold = 100 ppm
20mA = 2nd threshold = 40% LEL
20mA = 2nd threshold = 200 ppm
4-20mA output reference selection
jumpers with ref. to power supply negative or positive
Fault sensor
22 mA
22 mA
4-20mA output load resistor
< 200Ω at 12VDC power supply
< 200Ω at 12VDC power supply
200Ω-700Ω at 24VDC power supply
200Ω-700Ω at 24VDC power supply
Ambient temperature (°C):
Operation
-20÷50°C
-20÷50°C
Storage
-20÷70°C
-20÷70°C
Ambient relative humidity:
Operation
15%-90% non-condensing
15%-90% non-condensing
Storage
45%-75% non-condensing
45%-75% non-condensing
Operating pressure
80-110 kPa
80-110 kPa
Ambient air speed
< 6 m/s
< 6 m/s
2
Watts Water Technologies, Inc.
