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All sensors shall comply with relevant standards of UL or
BS/EN/BSEN or other international standards.
(d)
Combined Type Humidity and Temperature Sensors
Sensors shall have elements mounted in a common enclosure
and be able to be connected to remote controller by means of
suitable cables.
Sensors shall not require compensation for cable length etc.
Accuracy of the sensors shall be within 3% R.H. between
23ºC and 25ºC for temperature and humidity control
respectively.
All sensors shall comply with relevant standards of UL or
BS/EN/BSEN or other international standards.
Differential Pressure Sensors
t
(e)
ra
f
Differential pressure sensors shall vary the output voltage
with a change in differential pressure.
Sensors shall be connected to the remote controller by means
of suitable cables, and sensors shall not require
compensation for cable length etc.
All sensors shall comply with relevant standards of UL or
BS/EN/BSEN or other international standards.
(f)
Carbon Dioxide Sensors
D
Non-dispersive technology with sensing range of 0 to
2000 ppm shall be used for carbon dioxide sensors.
The accuracy shall be within 5%.
Carbon dioxide sensors shall be available for room or
ductwork mounting.
All sensors shall comply with relevant standards of UL or
BS/EN/BSEN or other international standards.
(g)
Carbon Monoxide Sensors
Carbon monoxide sensors shall be factory assembled units,
designed to continuously monitor and indicate the level of
carbon monoxide in parts per million on its meter with 4 mA
to 20 mA or 0V to 10V dc output and to activate the alarm
circuit, alarm horn and warning light when the carbon
monoxide concentration reaches the alarm point and
Section C4
Page 9 of 12
AC_GS
2012 Edition