DEGA NS III LCD User manual

INSTRUCTION
MANUAL
Gas Transmitter
DEGA NS III
Reproduction of this manual, or any part thereof, in any form, without the prior permission of
DEGA.CZ s.r.o. is prohibited.
DEGA CZ s.r.o. reserves the right to alter the specifications of the hardware and software
described in this manual at any time and without prior notice.
DEGA CZ s.r.o. bears no liable for any damage resulting from use of this device.

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Content
For your safety..................................................................................................................................................................................3
Technical data and information........................................................................................................................................................3
Operational conditions .....................................................................................................................................................................4
Terminology ......................................................................................................................................................................................4
Product desciption............................................................................................................................................................................5
Instalation, assembly and disassembly of the transmitter...............................................................................................................6
1. Assembly of the transmitter .................................................................................................................................................6
2. Replacement of the sensor module......................................................................................................................................6
3. Replacement of the battery..................................................................................................................................................6
4. Connecting the transmitter via current loop to the controler DEGA UPA II DEGA UPA III a DEGA UDA III..........................6
5. Connecting the sensor via RS485 to the controller DEGA UPA III/UDA III............................................................................7
6. Installation of wiring for RS485.............................................................................................................................................7
Selecting the appropriate type of cable depends on the fire report and the protocol for determining external influences. ....7
7. Setting the RS485 adress of the transmitter.........................................................................................................................7
8. Terminating resistor..............................................................................................................................................................7
9. Communication protocol switch DEGA/MODBUS................................................................................................................8
Transmitter functions .......................................................................................................................................................................8
1. Turning on the transmitter ...................................................................................................................................................8
2. Gas detection........................................................................................................................................................................8
3. Malfunction...........................................................................................................................................................................8
4. Monitoring the calibration periods.......................................................................................................................................8
5. Reading the record of measured concentrations and alarms ..............................................................................................8
Operation, maintenance, inspection and service of the transmitter ...............................................................................................8
1. Usage limits...........................................................................................................................................................................8
2. Operation..............................................................................................................................................................................9
3. Operation/Maintenance.......................................................................................................................................................9
Accessories and basic types of transmitters.....................................................................................................................................9
1. Calibration adapter/connection to the gas pump DEGA GAS INLET ....................................................................................9
2. Cover against splashing water DEGA WATER CAP..............................................................................................................10
3. Funnel for gas collection DEGA COLLECT CAP ....................................................................................................................10
4. Additional Ex „d“ bushing DEGA VÝVODKApro NSxIII.........................................................................................................10
Basic types of transmitters .............................................................................................................................................................10
1. Transmitters with a catalytic sensor NSx-CL III...................................................................................................................10
2. Transmitters with an electrochemical sensor NSx-EL III.....................................................................................................10
3. Transmitters with an infrared sensor NSx-IL III...................................................................................................................12
4. Transmitters with a semiconductor sensor NSx-SL III.........................................................................................................13
5. Transmitters with a PID sensor NSx-PID III .........................................................................................................................13
Attachments....................................................................................................................................................................................13
1. Chart for setting the transmitter adress.............................................................................................................................13
2. Signalization transmitted by the current loop 4-20mA ......................................................................................................13
General warranty terms and conditions.........................................................................................................................................14

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For your safety
Beware of static electricity
Electronic components are sensitive to static electricity. Do not touch them directly - they may get damanged.
The device is intended to be installed by a trained person
The product is designed for installation only by a certified technician. The manufacturer is not liable for damages resulting
from incorrect or improper handling.
In case of malfunction, immediately unplug from the power supply
If you notice an unusual smell or smoke emitting from the product, unplug it from the power supply, battery backup and all
other attachments. Continued operation could result in injury or property damage. After disconnecting, have the device
inspected at an authorized dealer or manufacturer.
Do not open the transmitter and do not replace the sensors in the transmitter in a potentially explosive atmosphere
Opening the cover and replacing the sensor in the transmitter in a potentially explosive atmoshpere can cause an explosion. If
service is necessary, first unplug the device from the power supply. After that the device may be disassembled and the
sensors may be replaced.
Do not disassemble the product and ensure against it's contact with water
Contact with internal components of the product may cause an electric shock. In case of any malfuction entrust the servicing
of the product exclusively to a certified service centre. Contact with water can create a short circuit in the product and
consequent damange to property or personal injury.
Use appropriate cable types
To ensure compliance with the parameters of the product, only use cable types recommended in this guide.
Dispose of used products and trasmitter sensors with respect to the environment
Transmitter sensors contain hazardous substances. Dispose of them in accordance with the current legislation on
environmental protection.
Use the transmitter only with the appropriate certified DEGA products
The device is certified as functionally and technically qualified only with original "DEGA" accessories. In case of using the
device with any other products the manufacturer is not liable for any damages that may occur.
Undertake regular functional checks and calibrations of the transmitter
Perform regular "CALIBRATION" (setting the detection limits, checking the responsivness of the sensor, checking the
functionality of the transmitter) and "OPERATIONAL AND FUNCTIONAL CHECKS" of the entire detenction system (sensor
excitation with subsequent control of optical and audible alarms, triggering fans, shutdown technology, etc.). Perform
calibration and operational and functional checks only at certified service centers with a valid certificate of competence or the
manufacturer.
Warning: The transmitter automatically checks it's calibration period - the period of validity of it's calibration. After 12 months since the
last calibration (Max. calibration period) the transmitter will transmit this fact to the host system. The transmitter must be calibrated
immediately at a certified service center with a valid certificate of competance or the manufacturer. See section "Monitoring the
calibration peridos".
Technical data and information
Supply voltage: 24 V nominal, operational range 8-30 V
Cable connections via 4-20 mA: shielded cable 3 x 1 mm (max. 1200 m)
shielded cable 3 x 1,5 mm (max. 2400 m)
Cable connections via RS485: shielded cable 4 x 0,8 mm (max. 1200 m) - see section “ instalation of cabeling for
RS485“
Output: 4 - 20 mA
RS485 - protocol DEGA, or MODBUS
Communication speed of RS485: 9,6 kB
Functional safety EN61508: SIL 2

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Marking according to ATEX: II 2 G Ex d IIB+H2 T6 Gb Tamb:-40°C-+60°C
II - class environment - non-mining environment
2 G - explosive atmospheres - zone 1
Ex d - type of protection - flameproof enclosure „d“
IIB+H2 - gas group
T6 - temperature gas group
Gb - type of protection according to EPL
Tamb - operating temperature range
Dimensions without bushings: 150x170x65 mm (WxHxD)
Dimensions of box: 185x165x80 mm (WxHxD)
Weight: 2,1 kg
Capacity of the internal memory ofhistory: 44 days at 60s recording interval
60 s (adjustable range 1-255 s)
5% of range
Interval record storage memory:
Dead band:
Consumption/input at24V (output RS485)
Warm-Up time
DEGA NSx-EL III
25 mA/0,6 W
DEGA NSx-EL II LCD RE
max. 180 s
DEGA NSx-CL III
70 mA/1,7 W
DEGA NSx-CL II LCD RE
max. 30 s
DEGA NSx-IL III
50 mA/1,2 W
DEGA NSx-IL II LCD RE
max. 15 s
DEGA NSx-SL III
DEGA NSx-PL III PID
70 mA/1,7 W
154 mA/3,4 W
DEGA NSx-SL II LCD RE
DEGA NSx-PL III PID
max. 180 s
max. 15 s
Consumption/input at 24V (output 4-20mA)
Time to stabilize (>5day without power)
DEGA NSx-EL III
45 mA/1,1 W
DEGA NSx-EL II LCD RE
Up to several hours -
based on sensor type
DEGA NSx-CL III
90 mA/2,2 W
DEGA NSx-CL II LCD RE
max. 1 h
DEGA NSx-IL III
70 mA/1,7 W
DEGA NSx-IL II LCD RE
max. 30 min
DEGA NSx-SL III
DEGA NSx-PL III PID
90 mA/2,2 W
154 mA/3,7 W
DEGA NSx-SL II LCD RE
DEGA NSx-PL III PID
max. 5 h
max. 30 min
Response time (T90)
Sensor lifetime in a clean environment
DEGA NSx-EL II LCD RE
max. 180 s - based on sensor type
DEGA NSx-EL II LCD RE
2 years
DEGA NSx-CL II LCD RE
max. 15 s
DEGA NSx-CL II LCD RE
2 years
DEGA NSx-IL II LCD RE
max. 15 s
DEGA NSx-IL II LCD RE
5 + years
DEGA NSx-SL II LCD RE
DEGA NSx-PL III PID
max. 30 s
max. 15 s
DEGA NSx-SL II LCD RE
DEGA NSx-PL III PID
2 years
5000 hours
Operational conditions
Ambient temperature: -40°C to +60 °C
Relative humidity: 0-95 % RH
Air pressure: 86 - 108 kPa
Flow of ambient air: max. 2 m/s - flow directly to the sensor in not allowed
Protection level with a cover: IP 64, with a DEGA WATER CAP IP66 cover
Location: BE3N2 - explosive atmoshpheres - zone 1 (2 G)
Terminology
The marking system for sensors DEGA NSx-yL III:
Gas sensor DEGA NSx-yL III
Series of detectors in potentially explosive atmospheres
Type of detected gas
Sensor type with linear output
Third generation product with new DEGA design
DEGA NSx-EL III with an electrochemical sensor
They operate on the principle of change of electrical parameters on the electrodes stored in electrolyte, due to
oxidation/reduction reactions of the detected gas on it's surface. These sensors have good selectivity and the ability to detect
very low concentrations of toxic gases.

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DEGA NSx-CL III with a catalytic sensor (Pelistor)
They operate on the principle of catalytic combustion - gas concentration is measured based on the amount of heat released
in a controlled combustion reaction. The reaction is supported by a suitable temperature and the pressence of a catalyst.
These sensors can be used to detect a broad range of flammable gases. The sensors are characterized by fast response,a long
lifetime and high stability. A minimum of 10% of Oxygen in the air is required for it's proper function.
DEGA NSx-IL III with an infrared sensor (NDIR)
Top quality scanning method. They operate on the principle of infrared spectroscopy. The sensors have excellent selecivity in
organic matter, do not require any oxygen in the atmoshpere and are resistant to catalyst poisons (sulfur and silicon
compounds) which cause a change of sensitivity of catalytic sensors. The sensors are characterized by high stability and a long
lifetime.
DEGA NSx-SL III with a semiconductor sensor
Cheapest method of scanning. They operate on the principle of changes in electrical conductivity of semiconductors by
changing the concentration of the detected gas. Their advatage is a long lifetime in a clean environment and a wide range of
different types of gases and vapors. Their disadvatage is their low selectivity - the sensor largly responds to other gases for
which it is not calibrated.
Other types:
DEGA NSx-yL III LCD - with an LCD display
DEGA NSx-yL III LCD RE - with an LCD display and a quad relay
DegaConfig - sensor adjusting software enabling it's full configuration and calibration.
Product desciption
Sensor cover
Ex „d“ bushing
OptionalEx „d“
bushing
Body of the removable
sensor
Sensor bottom
Body of the removable
sensor
Ex „d“ bushing
6
5
4
3
2
1
7

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Mounting holes PCB electronics Ex „e“ bushing Removable Ex „e“ bushing
Body of the
removable sensor
Power supply terminal
block+24V DC
Power supply
terminal block GND
Signal terminal block 4-20mA
Jumper connector
of the terminal
resistor RS485
Jumper connector of the
communication protocol
(DEGA/MODBUS)
Battery CR2032
DIP switch for the RS485
adress
Programming
connector
LCD display connector Status LED Calibration jumpers
Instalation, assembly and disassembly of the transmitter
Before assembling, read the valid instalation standarts EN 60079-29-2 (Selection, instalation, use and maintenance of
detectors for combustible gases and oxygen) and EN 45544-4 (Guildelines for the selection, installation, use and maintenance
of detectors of toxic substances).
In explosive environments the electrical installation must be performed according to DIN EN 60079.14 (Electrical instalation in
hazardours areas)
Secure that the sensor is reachable by air. The transmitter must be in a free area with no obstacles in its way (furniture etc.)
Ensure that the input of the sensor cannot be polluted by layers of dust or other contamination.
1. Assembly of the transmitter
The transmitter consists of four parts - the body of the transmitter, the removable sensor and Ex „d“ bushings.
Transmitter assembly procedure is as follows:
a) Disassemble the transmitter with the four hexagon socket screws 4mm
b) Disconnect the LCD motherboards
c) Mount the transmitter on a flat surface with four 6mm fasteners in height above the floor with the gas
entrance facing downwards, as specified by the detected substance
d) Direct the cable trough the bushing
e) Connect the cabeling to the terminal block. When using the second Ex „d“ bushing, dismout the Ex „d“
blind plug. It is allowed to use only Ex „d“ bushings with M20x1,5 threads
f) Connect the LCD
g) Assemble the transmitter with the four hexagon sockets scews 4mm
2. Replacement of the sensor module
This activity must not be performed when the sensor is energized.
In case of need to replace the sensor module with a new piece, unscrew and remove
the cover. Disconnect the sensor module cable from the PCB (1), loosen the sink screw
(2) and unscrew the steel cylinder with the sensor (3). Screw the new sensor module,
retain it with the sink screw and connect the cable to the PCB. Finally, mount the cover
and connect to the power supply.
3. Replacement of the battery
Životnost baterie ve snímači je asi 5 let. Po této době již nemusí být některé funkce detektoru
zachovány. Baterii vyjmeme z držáku a nahradíme ji typem Panasonic BR2032. Výměnou baterie ve
snímači, který není pod napájením, dojde k vymazání interních hodin.
4. Connecting the transmitter via current loop to the controler DEGA UPA II DEGA UPA III a DEGA UDA III
Connect one transmitter to each channel of the controler as shown in the picture below
22
21
20
19
18
17
16
15
6
5
8
7
4
3
2
1

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5. Connecting the sensor via RS485 to the controller DEGA UPA III/UDA III
6. Installation of wiring for RS485
Wiring must be done using bus topology and according to the RS485 principles.
Maximum number of connected transmitters per controler channel is 16 (may be less depending on the
configuration of the controller), while the total length of the connecting cable (electrical distance between the
controller and the last transmitter) should not exceed 1200 meters. Due to voltage disposals caused by each
transmitter, the maximum addition of distances must be L1+L2+L3+…+L16:
Cable type
NSx-CL III
NSx-IL III
NSx-SL III
NSx-EL III
Shielded 4x0,8mm
2,1 km
2,9 km
2,9 km
4,2 km
Shielded 4x1mm
3,3 km
4,4 km
4,4 km
6,5 km
Shielded 4x1,5mm
6,2 km
7,3 km
7,3 km
11,6 km
Shielded 4x2,5mm
10,1 km
13,5 km
13,5 km
20,1 km
Selecting the appropriate type of cable depends on the fire report and the protocol for determining external influences.
7. Setting the RS485 adress of the transmitter
Each transmitter must have a unique adress within the entire bus, otherwise there will be
communication collisions and malfunctions.
The transmitter adress can either be set internally using the DegaConfig program or using the DIP
switch on the PCB.
If the position 6 (labeled ADD) is in the ON position, then the adress according to the setting of pins 1-5
is considered. Otherwise the adress set in DegaConfig is considered.
The adress can be set from range 1-31 using binary values. A table with DIP settings for individual
adresses is listed in the attachment "Chart for setting the transmitter adress"
8. Terminating resistor
According to the RS485 specifications, the last device on the bus must be ending with a terminating
resistor 120R. Plug a jumper on the JP2 connector of the last device on the bus to include the 120R
terminating resistor. In the default configuaration the jumper connector is not plugged.

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9. Communication protocol switch DEGA/MODBUS
Plugging a jumper in the JP1 connector will swtich from the DEGA communication protocol to the
MODBUS communication protocol.
Transmitter functions
The detector's motherboard is equipped by status LEDs, which help in detecting problems during the installation.
LED „POW“ shines at correct power
LED „TxD“ flashes when transmitting a packet via RS485
LED „RxD“ flashes when a packet is correctly recieved via RS485
LED „ERR“ shines/flashes in case of malfunction or substandart situations
1. Turning on the transmitter
After turning on the power the LED "POW" starts shining and the LED "ERR" starts flashing, indicating a forming
sequence of the sensor and automatic testing procedures, which can take up to 180s depending on the sensor used.
The output of the current loop is 1mA. During this sequence, testing of internal electronics and stabilization of the
sensor in order to eliminate false alarms after turning on, is taking place. At this time, the display only shows the
time to the beginning of the measurement loop.
After completion of the formation, a 4mA current begins to flow on the output of the current loop and the
transmitter starts working according to it's settings.
2. Gas detection
The transmitter continuously measures the detected gas concentration in the atmoshpere and converts it's current
value into a 4-20 mA signal or transmits it's value to the evaluation unit via DEGA/MOBUS protocol.
3. Malfunction
If a malfunction of electronics or the sensor is detected during operation, the transmitters starts transmitting via a
0,5mA current loop. On the PCB this state is indicated by the yellow LED "ERR"
4. Monitoring the calibration periods
The transmitter continuously checks the calibration validity of the connected sensor.
After 12 months since the last calibration (Max. calibration interval) the LED "ERR" starts flashing. The connected
sensor must be calibrated immediately. The transmitter will transmit the information about the ending calibration
via current loop. The transmission will be the following: 10s transmitting a 4-20mA signal informing about the actual
gas concentration following a 1 second interval of 2mA current.
5. Reading the record of measured concentrations and alarms
The transmitter periodically after 60s stores the current detected concentration into it's internal memory. The
internal memory retains data from the last 64260 measurements (cca 44 days). In order to read this information,
the program DegaConfig is required. Refer to the DegaConfig program instruction.
Operation, maintenance, inspection and service of the transmitter
1. Usage limits
To maintain proper operation of the transmitter it is neccesery to respect the fact, that step changes of humidity,
condensation or rapid changes of pressure can cause incorrect indication of the measured value. Each sensing technology is
suited for different methods of application, which is described below. All sensors are characterized by a smaller or larger cross-

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sensitivity to other gases than those which are set. Therefore before processing project documentation we recommend to
have the air in the deployment area of the detection system analyzed.
a) catalytic sensors:Trace amount of vapors of silicon compounds and sulfur compounds cause a permanent loss of sensitivity,
which requires recalibration or replacement of the sensor. Longterm crossing of the measuring range causes a decrease in
sensitivity. In case of an atmoshpere having an oxygen content of less than 17%, there will be an underestimaton of the
measured value. In case of an atmoshpere having an oxygen content of more than 25%, there will be an overestimation of the
measured value.
b) electrochemical sensors:Constant exposure to toxic gases or short-term exposure to gases, which greatly exceed the
maximum range of the sensor, can damage the electrochemical sensor, which requires recalibration or replacement. High
temperature along with low relative humidity have a negative effect on the sensor's lifetime. In case of an atmoshpere having
an oxygen content of less than 1% for longer than 1 hour, there will be an underestimation of the measured value.
c) infrared sensors:Vapor acids and alkalis can etch the optical system and distort the measurements. A check or a calibration
may be neccesery.
d) semiconductor sensors: Short-term exposure to gases or vapors of organic solvents, which greatly exceed the maximum
range of the sensor, may damage the sensor and a recalibration or replacement may be required. In case of an atmoshpere
having na oxygen content of less than 18%, there will be an underestimation of the measured value.
2. Operation
To maintain proper operation of the transmitter it is neccesery to respect the fact, that the presence of certain concentrations
of gases or vapors, other than those for which the sensor is set, can cause an alarm, even if the concentration of the gas does
not exceed the set level. Given the range of disturbing gases or vapors (diluents, exhaust gases, vapors of organic substances,
disinfectants, etc.) a generally allowable concentration of interfering gases can not be determined. Data on cross-sensitivity to
certail gases are included at the apporpriate sensors. Therefore before processing project documentation we recommend to
have the air in the deployment area of the detection system analyzed.
3. Operation/Maintenance
In case of contamination the surface can be cleaned with a slightly moistened cloth.
The seonsors have a different lifetime depending on the sensing technology used, and environmental conditions.
Characteristics of the sensors vary over time. Therefore it is required to perform regular checks and calibrations, which can be
done in two ways:
a) 1x every six months carry out a „calibration“ and functional control - adjust the sesitivity of the sensor using calibration
gas and check the functionality of the system. The exact interval depends on the purity of the environment, required
accuracy and the occurrance of disturbing gases in the atmoshpere.
b) 1x every twelve months carry out a „calibration“ - adjust the sesitivity of the sensor using calibration gas and check the
functionality of the system. The exact interval depends on the purity of the environment, required accuracy and the
occurrance of disturbing gases in the atmoshpere. Also carry out a „functional control" 1 x every three months -
checking the function of the entire detection system using a test gas, which does not exceed the range of the sensor.
We recommend using gas intended for laboratory use.
For the „functional control“ do not use means for testing fire alarm detectors!
Perform calibration only at certified service centers with a valid certificate of competence or the manufacturer.
For the Czech Republic only DEGA CZ s.r.o.
Accessories and basic types of transmitters
1. Calibration adapter/connection to the gas pump DEGA GAS INLET

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2. Cover against splashing water DEGA WATER CAP
3. Funnel for gas collection DEGA COLLECT CAP
4. Additional Ex „d“ bushing DEGA VÝVODKApro NSxIII
M20x1,5
Basic types of transmitters
1. Transmitters with a catalytic sensor NSx-CL III
Product code Transmitter type Detected gas Measurement
range
Measurement of
current loop
(4-20mA)
Resolution Calibration gas
40100069 DEGA NSM-CL 100 III
Methane (CH
4
)
Natural gas
CNG
0–100 % LEL 0-20 % LEL 0,1 % LEL Methane 0,88 %
40100070 DEGA NSP-CL 100 III
Butane (C
4
H
10
)
Propan-Butane
LPG
0–100 % LEL 0-20 % LEL 0,1 % LEL Butane 0,32 %
40100071 DEGA NSH-CL 100 III Hydrogen (H2) 0–100 % LEL 0-20 % LEL 0,1 % LEL Hydrogen 0,8 %
40100068 DEGA NSHC-CL 100 III
Other
flammable and
combustible
gases and
vapors
according to the
selectivity of
the sensor
0–100 % LEL 0-20 % LEL 0,1 % LEL According to the selectivity of the
sensor
2. Transmitters with an electrochemical sensor NSx-EL III
Product code Transmitter type Detected gas Measurement
range
Measurement of
current loop
(4-20mA)
Resolution Calibration gas
40100022 DEGA NSCO-EL 1000 III Carbon
Monoxide (CO) 0–1000 ppm 0-130 ppm 1 ppm Carbon Monoxide 130 ppm
40100019 DEGA NSCO-EL 200 III Carbon
Monoxide (CO) 0–200 ppm 0-200 ppm 0,1 ppm Carbon Monoxide 130 ppm
40100020 DEGA NSCO-EL 500 III Carbon
Monoxide (CO) 0–500 ppm 0-500 ppm 0,1 ppm Carbon Monoxide 130 ppm
40100021 DEGA NBCO-EL A500 III Carbon
Monoxide (CO) 0- A500 ppm 0-500 ppm 1 ppm Carbon Monoxide 130 ppm
40100023 DEGA NSCO-EL 2000 III Carbon
Monoxide (CO) 0–2000 ppm 0-2000 ppm 1 ppm Carbon Monoxide 130 ppm
40100039 DEGA NSA-EL 100 III Ammonia
(NH3) 0-100 ppm 0-50 ppm 0,1 ppm Ammonia 100 ppm
40100041
DEGA NSA-EL 1000 III Ammonia
(NH3)
0-1000 ppm 0-300 ppm 1 ppm Ammonia
100 ppm
40100044 DEGA NSA-EL 10000 III Ammonia
(NH3)
0-10000 ppm
0-10000 ppm
1 ppm
Ammonia
100 ppm