Carel GDWBI20A00, Руководство пользователя

Страница: 47 / 52

23
ENG
+0300046IE - rel. 1.3 - 05.01.2022
6. ADDITIONAL INFORMATION
6.1 Sensor Principles
6.1.1 Semiconductor sensors
Semiconductor or metal-oxide-semiconductor (MOS) sensors are very
versatile and can be used in a wide range of applications: they can
measure both gases and vapours at low ppm and combustible gases
at higher concentrations. The sensor is made from a blend of metal
oxides. These are heated to a temperature between 150 °C and 300
°C, depending on the gas to be detected. The operating temperature
and composition of oxides determines the selectivity of the sensor
with respect to diff erent gases, vapours and refrigerants. Electrical
conductivity increases signifi cantly as soon as gas or vapour molecules
come into contact with the sensor’s surface by diff usion.
When the molecules of the selected gas come into contact with the
sensor’s surface, the conductivity of the semiconductor material increases
signifi cantly, in proportion to the concentration of gas. Consequently, the
current running through the sensor also varies.
Water vapour, high ambient humidity, temperature fl uctuations and low
oxygen levels can alter the readings, giving a higher concentration than
the actual level.
6.1.2 Infrared sensors
Infrared (IR) gas sensors are designed to measure the concentration of
combustible gases and vapours in ambient air. The sensor’s operating
principle is based on the absorption of infrared radiation in the measured
gases, which varies according to their concentration.
The ambient air being monitored diff uses through a sintered metal
material inside an “optical compartment”. The broadband radiation
emitted by an IR source passes through the gas in the compartment and
is refl ected by the walls, from where it is directed towards a dual-element
detector. The fi rst channel of the detector measures the transmission
of radiation through the gas, while the second is used as a reference.
The relationship between the two measurements is used to determine
the gas concentration. The electronics and software inside the device
calculate the concentration and produce an output signal.
6.1.3 Electrochemical sensors
Electrochemical sensors measure the partial pressure of gases in
atmospheric conditions. The monitored ambient air diff uses through a
membrane into a liquid electrolyte inside the sensor. Immersed in the
electrolyte are a measuring electrode, a counter electrode and a reference
electrode. An electronic circuit with a potentiometer supplies a constant
voltage between the measuring electrode and the reference electrode.
The voltage, the electrolyte and the material used to make the electrodes
are selected according to the gas being measured, so that this is correctly
transformed electrochemically on the electrode for measurement and
thus a current is generated that fl ows through the sensor. The current
value is proportional to the concentration of gas. At the same time,
oxygen from the ambient air reacts with the counter electrode.
At an electronics level, the current signal is amplifi ed, digitised and
corrected based on other control parameters (e.g. ambient temperature).
6.1.4 Carel spare parts: devices and sensors (“C”)
Carel devices and sensors supplied as spare parts where the ninth digit in
the part number is the letter C, have a calibration certifi cate included in
the packaging, together with the technical leafl et.
6.2 Disposing of the Instrument
6.2.1 Disposing of the Electrical & Electronic Equipment
EU-wide regulations governing the disposal of electrical and electronic
appliances which have been defi ned in the EU Directive 2012/19/EU
(WEEE) and in national laws have been eff ective since August 2012 and
apply to this device.
Common household appliances can be disposed of using special
collecting and recycling facilities. However, this device has not been
registered for household usage. Therefore it must not be disposed of
through these channels. Please do not hesitate to contact Carel if you
have any further questions on this issue.
6.2.2 Disposing of Sensors
Dispose of sensors in accordance with local laws.
DANGER: Do not dispose of sensors in fi re due to the risk of
explosion and resulting chemical burns.
WARNING: Do not force open electrochemical sensors.
WARNING: Observe the applicable local waste disposal
regulations. For information, consult your local environmental agency,
local government offi
ces or appropriate waste disposal companies.
6.3 Standard Conformities
•
European Directive 2014/30/EU (EMC) and conforming to standards:
- EN50270:2015, EN60335-2-40, EN14624 EN50271
- EN55022:2010.
•
European Directive 2014/35/EU (LVD) and conforming to standards
related with “Electrical Equipment for Measurement, Control, and
Laboratory Use”:
-
UL61010-1/CSA C22.2 No. 61010-1,
-
IEC61010-1,
- EN61010-1.
•
European Directive 2014/53/EU (RED) for radio equipment;
•
RoHS (2015/863/EU) e REACH;
FIRMWARE CHANGES (from revision with serial number greater than
21072486, manufactured after 1 June 2021)
Offl ine timeout reduced from 30 minutes to 15 minutes.
Duration of alarm deactivation changed to 15 minutes.
Alarm logging now enabled by default. Devices with relays will now be in
failsafe mode by default
Note : this equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to Part 15 of the
FCC rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee
that the interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or
more of the following measures:
•
Reorient or relocate the receiving antenna.
•
Increase the separation between the equipment and receiver.
•
Connect the equipment into an outlet on a circuit diff erent from that
of the receiver.
•
Consult the dealer or an experienced radio/TV technician for help.