EW146691_en - rev. A
Gas Detectors
–
UR.21.P
02/04/2020
Gas detection systems for car parks and tunnels
1/8
Sensigas
®
Gas Detectors
for car parks and tunnels
IP55 Protection Degree
UR.21.P
Sssssss
10
…28Vdc power supply.
Catalytic sensing element for flammable gases, and Electrochemical Cell for toxic gases.
Up to three alarm threshold.
Automatic counting life time of sensors.
Use
The UR.21.P detectors, being specifically designed for car parks, are used primarily to detect
the presence of Gasoline Vapors and Carbon Monoxide (CO), but also Methane gas, LPG and,
on demand, Nitrogen Monoxide (NO), Nitrogen Dioxide (NO
2
) and other gases.
UR.21.P detectors can be used in stand-
alone mode with 4…20mA output and, in option, with a
voltage-free contact relay card, or variable resistance output for the following operational
conditions:
Pre-alarm, 1st alarm threshold, 2nd alarm threshold, Sensor Failure.
Operation
In case of a gas leak the detector compares the measured concentration value with the
intervention thresholds set by activating the relays or the resistive outputs (if provided)
associated with them. The information of the measured concentration value is always present
on the 4 ÷ 20mA output.
Ordering
Simply indicate product code: please, refer to “available models”.
Available models:
Models on demand:
Code: UR xx yy z P
Sensing Element type:
S = Standard; P= Professional.
P= IP55 Protection Degree and design for car parks applications
“21” for Stand Alone detectors with 4…20 mA output
“41” for Bus Based System EW40
G = Methane; P = LPG; O = Carbon Monoxide; B = Gasoline Vapours;
N1 = Nitrogen Monoxide; N2 = Nitrogen Dioxide;
L = Acetylene; I = Hydrogen; M = Ammonia (LIE); C = Propane; T = Octane;
E = Ethyl Alcohol; X = Xylene; A = Acetone; H = Hexane; Q = Cycle-Hexane;
T = Toluene; N = Pentane; U = Butane; F = Heptane; K = Ethane; V = Methanol;
Z = Benzene; Y = Ethyl Acetate; HY = Hydrocarbons in general
(1)
.