AT-G-DETECT
Gas Sensing System
LEAK DETECTION SOLUTIONS
3
D. BUMP TEST
Ideally bump tests are conducted on site in a
clean air atmosphere.
SEMICONDUCTOR SENSORS
We o
ff
er cylinders of calibration gas at known
concentration and ampoules for ammonia
(NH3) at 100ppm and1.000 ppm and using
these constitute a quanti
fi
ed bump test.
the gas onto the sensor and force it into
alarm. Check that alarm lights and relays are
activated.
INFRARED SENSORS FOR CO2
DETECTION
For a quanti
fi
ed bump test you can check the
infrared sensors for carbon dioxide using
Aquilar ampoules
fi
lled with CO2 at 2000ppm
in air or calibration cylinders. If these are not
available, you can carry out a non-quanti
fi
ed
bump test by breathing on the sensor. The
human breath has enough CO2 to trigger the
alarm. If the bump test is not successful then
carry out a gas calibration, see below.
E. BUMP TEST USING GAS AMPOULES
1. Make sure that both the ampoules and the
calibration beaker are clean and dry.
2. Unscrew the beaker hold screw and place
the ampoule so that it sits in the base of
the beaker
3. Tighten on the screw onto the ampoule
without breaking it
4. Remove the enclosure lid of the gas sensor
(not in Ex area and in one level units as
monitoring of voltage can be done on
controller). If this is a CO2unit also remove
the yellow cap (if on your model) on the
calibration port
5. Connect volt meter to monitor sensor
response
6. Place the beaker over the sensor head
(using an adaptor if required)or, if an
Exd or Remote sensor head version, M35
or M42 thread, screw the beaker on the
remote sensor head. It should be as tight
a
fi
tting as possible to allow maximum
exposure to the gas.
7. CO2 ampoule: hold the beaker in a
45-degree angle as per illustration. This
allows gas to
fl
ow through the front back
of the sensor and though the calibration
ports).
Unit 30, Lawson Hunt Industrial Park,
Broadbridge Heath, Horsham, West Sussex,
RH12 3JR
+44 (0) 1403 216100
[email protected]
www.aquilar.co.uk
