DEGA NS III LCD Series User manual

INSTUCTION
MANUAL
Gas Detection Transmitter
DEGA NS III LCD
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 description...........................................................................................................................................................................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
Transmitter controls .........................................................................................................................................................................9
1. History menu „HIST“ ...........................................................................................................................................................10
2. Information menu „INF“ .....................................................................................................................................................10
3. Settings menu „SET“ ...........................................................................................................................................................11
4. Test menu „TEST“ ...............................................................................................................................................................13
Operation, maintenance, inspection and service of the transmitter .............................................................................................14
1. Usage limits.........................................................................................................................................................................14
2. Operation............................................................................................................................................................................14
3. Operation/Maintenance .....................................................................................................................................................14
Accessories and basic types of transmitters...................................................................................................................................15
1. Calibration adapter/connection to the gas pump DEGA GAS INLET ..................................................................................15
2. Cover against splashing water DEGA WATER CAP..............................................................................................................15
3. Funnel for gas collection DEGA COLLECT CAP ....................................................................................................................15
4. Additional Ex „d“ bushing DEGA BUSHING pro NSxII..........................................................................................................15
Basic type of transmitters...............................................................................................................................................................15
1. Transmitters with a catalytic sensor NSx-CL III LCD............................................................................................................15
2. Transmitters with an electrochemical sensor NSx-EL III LCD..............................................................................................15
3. Transmitters with an infrared sensor NSx-IL III LCD ...........................................................................................................17
4. Transmitters with a semiconductor sensor NSx-SL III LCD .................................................................................................18
Attachments....................................................................................................................................................................................19
1. Chart for setting the transmitter adress.............................................................................................................................19
2. Table of error codes............................................................................................................................................................19
3. Signalization transmitted by the current loop 4-20mA ......................................................................................................20
4. Package content..................................................................................................................................................................20
General warranty terms and conditions.........................................................................................................................................21

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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
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

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Gb - type of protection according to EPL
Tamb - operating temperature range
Dimensions without bushings: 150x170x65 mm (WxHxD)
Weight: 2,1 kg
Capacity of the internal memory of history: 44 days at 60s recording interval
Interval record storage memory: 60 s (adjustable range 1-255 s)
Dead band: max 5% of range
Consumption/input at 24V (output RS485)
Warm-Up time
DEGA NSx-EL III LCD
90 mA/2,2 W
DEGA NSx-EL III LCD
max. 180 s
DEGA NSx-CL III LCD
135 mA/3,3 W
DEGA NSx-CL III LCD
max. 30 s
DEGA NSx-IL III LCD
115 mA/2,8 W
DEGA NSx-IL III LCD
max. 15 s
DEGA NSx-SL III LCD
135 mA/3,3 W
DEGA NSx-SL III LCD
max. 180 s
DEGA NSx-PL III LCD
154 mA/3,4 W
DEGA NSx-PL III LCD
max. 30 s
Consumption/input at 24V (output 4-20mA)
Time to stabilize (>5day without power)
DEGA NSx-EL III LCD
110 mA/2,7 W
DEGA NSx-EL III LCD
Up to several hours - based on sensor type
DEGA NSx-CL III LCD
155 mA/3,7 W
DEGA NSx-CL III LCD
max. 1 h
DEGA NSx-IL III LCD
135 mA/3,3 W
DEGA NSx-IL III LCD
max. 30 min
DEGA NSx-SL III LCD
155 mA/3,7 W
DEGA NSx-SL III LCD
max. 5 h
DEGA NSx-PL III LCD
154 mA/3,4 W
DEGA NSx-PL III LCD
max. 30 min
Response time (T90)
Sensor lifetime in a clean environment
DEGA NSx-EL III LCD
max. 180 s - based on sensor type
DEGA NSx-EL III LCD
2 years
DEGA NSx-CL III LCD
max. 15 s
DEGA NSx-CL III LCD
2 years
DEGA NSx-IL III LCD
max. 15 s
DEGA NSx-IL III LCD
5 years
DEGA NSx-SL III LCD
max. 30 s
DEGA NSx-SL III LCD
2 years
DEGA NSx-PL III LCD
max. 15 s
DEGA NSx-PL III LCD
1 year
Operational conditions
Ambient temperature: -40°C to +85 °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 LCD:
Gas sensor DEGA NSx-yL III LCD
Series of detectors in potentially explosive atmospheres
Type of detected gas
Sensor type with linear output
Third generation product with new DEGA design
Versions with an LCD display
DEGA NSx-EL III LCD 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.
DEGA NSx-CL III LCD 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

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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 LCD 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 LCD 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 basic version
DEGA NSx-yL III LCD - with an LCD display
DegaConfig - sensor adjusting software enabling it's full configuration and calibration.
Product description
Magnetic control
„BACK“
Magnetic control
„FRONT“
Ex „d“ bushing
Magnetic control
„ENTER/EXIT“
IrDa interface
OptionalEx „d“
bushing
Body of the
removable sensor
Cover against splashing
water (optional
accessories)
Body of the
removable sensor
Ex „e“ bushing
Cover against
splashing water
(optional
accessories)
Mounting holes PCB electronics Ex „e“ bushing
Optional Ex „e“ bushing
4
3
2
1
11
10
9
6
5
8
7
4
3
2
1

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Body of the
removable
sensor
Power supply terminal
block+24V DC
Power supply
terminal block GND
Signal terminal block 4-20mA
Terminal resstor
RS485 A
Terminal resistor
RS485 B
NA NA
NA NA
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
The battery lifetime in the sensor is approximately 5 years. After this time some functions of the
detector may not work properly. Remove the battery from the holder and replace it with one of the
recommended types. Replacing the battery in the transmitter, which is not connected to the power,
will erase the internal clock.
Panasonic BR2032.
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
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13
16
15
12
11
10
9
22
21
20
19
18
17
6
5
8
7

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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 LCD
NSx-IL III LCD
NSx-SL III LCD
NSx-EL III LCD
Shielded 4x0,8mm
1,7 km
2,3 km
2,3 km
3,4 km
Shielded 4x1mm
2,7 km
3,5 km
3,5 km
5,2 km
Shielded 4x1,5mm
4,9 km
5,9 km
5,9 km
9,2 km
Shielded 4x2,5mm
8,1 km
10,9 km
10,9 km
16,2 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
In case of malfunction the LCD displays the measured concentration, an error code and a key symbol . On the PCB this
condition is indicated by the yellow „ERR“ LED. The meaning of each error code is included in the attachment "Table of error
codes"
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 and an inscription
starts flashing on the LCD display. 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.

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Transmitter controls
Transmitters equipped with an LCD display can be controlled by the magnetic contact located on the sides of the display
Warning: calibration
required
Warning: Service is
required
Data display Time display
Channel number
(adress)
Activated magnetic
control
Calibration icon
Communication with the
control panel in
progress
Measured value
Bar graph of the
measured value
Measured value
units
Alarm PEL (exceeding
long-term exposure
limit)
Alarm STEL
(exceeding short-
term exposure limit)
Reached alarm level
Alarm indication
- „BACK“ move backwards in the menu, reducing the value
- „FRONT“move forwards in the menu, increasing the value
- „ENTER“ confirm/enter the menu
Placing a magnet into the indent „ “ for 2s, activates the magnetic control, which is displayed by the icon „ “ on the LCD.
Reaching level 4 alarm with catalytic and semiconductor sensors causes a ratchet phenomenon, where even after recovery
from gas leak, the sensor is still in level 4 alarm and needs to be manually reset by pressing „ “.
Main menu structure:
Menu entry
|
History->-Information->-Settings->- Test->- Exit
|-----------------------<------------------------------|
Menu
Display
Description
History
Browsing the alarm history
Information
Information about transmitter settings
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14
13
12
11
10
9
8
7
6
5
4
3
2
1

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Settings
Transmitter configuration
Test
Testing the transmitter funcions
Exit
Return to normal operation
1. History menu „HIST“
Browsing the history
Menu
Display
Description
History of all
alarms
Use „ “ to go trough individual alarms. Displays the
date and time of the alarm. Return to the history menu
„“
Highest
concentration in
the past hour
Displays the highest measured concentration and alarm
for the past hour. Return to History menu „ “
Highest
concentration in
the past 8 hours
Displays the highest measured concentration and alarm
for the past 8 hours. Return to History menu „ “
Highest
concentration in
the past 12 hours
Displays the highest measured concentration and alarm
for the past 12 hours. Return to History menu „ “
Highest
concentration in
the past 24 hours
Displays the highest measured concentration and alarm
for the past 24 hours. Return to History menu „ “
Highest
concentration
stored in the
memory
Displays the highest measured concentration and alarm,
that is stored in the memory. Return to History menu
„“
Exit
Return to the main menu
2. Information menu „INF“
Information about settings. Sequentially displays the following information. Access previous information by pressing „ “
Menu
Display
Description
Date of next
calibration
Displays the date of the next calibration