Trolex TX6353 User manual

TX6353 User Manual
TX6353-UM-EN-01 Draft r 3
TX6353 SentrO P
Contents
1. Product Overview 4
1.1 Operating Features 4
1.2 Application 5
1.3 Product Options 5
1.4 Dimensions 6
1.5 Technical Information 7
1.6 Electrical Details 9
1.7 Sentro eModules 10
1.7.1 Sentro eModules 11
2. Certification 14
2.1 Pennsylvania State 14
2.2 MSHA 14
3. Installing 16
3.1 Safety Precautions 16
3.2 Tools and Test
Equipment Required 17
3.3 Siting Recommendations 18
3.4 Connections 19
3.4.1 RS485 Data Output Signal 19
3.4.2 Auxiliary Output Signal 19
4. Setup and Calibration 20
4.1 Controls and Indicators 20
4.2 Main Display 22
4.3 Function Menus 23
4.4 Setup and Calibrate 24
4.4.1 Start-up Screen 24
4.4.2 Main Display 24
4.4.3 Main Menu 24
4.4.4 Calibrate 25
4.4.5 TX6353 Setup 28
4.4.6 Output Setup 39
4.4.7 Module Setup 43
4.4.8 Exit 45
4.5 Support 45
5. Diagnostics and
Maintenance 46
5.1 Diagnostic Messages 46
5.2 Maintenance 47
5.2.1 Introduction 47
5.2.2 SentrO P Gas Inlet Port -
Check and Clean 48
5.2.3 SentrO P - Bump Test 48
5.2.4 Sentro eModules - Calibrate 48
5.2.5 SentrO P - Safety Check 49
5.2.6 Sentro eModules - Replace 49
5.3 Recommended Test Gas
Concentrations 51
5.4 Disposal 52
5.5 Maintenance Records 53
5.6 Maintenance Log 53
Disclaimers 54
Trademarks 54
Contact Details 54
Document History 54
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1. Product Overview
TX6353.03 SentrO P Open Protocol gas detector
12 V dc - intrinsically safe Mining and Tunnelling
TX6353.04 SentrO P Open Protocol gas detector
24 V dc - General Purpose
1.1 Operating Features
• High accuracy gas detector with serial data output configured for open network
integration, on newly installed or existing data networks
• Pre-calibrated plug-in gas sensing eModule can be replaced in seconds for ease
of calibration and maintenance
• Large backlit LCD screen provides concise menu driven calibration guide and
sensor diagnostics
• Two inbuilt LED alarm indicators for General and High alarm with programmable
setpoints
• Auxiliary analogue output signal to drive a local audio visual alarm unit when
required
• Power supply voltage level data is transmitted over the RS485 Modbus for
constant monitoring
• Certified intrinsically safe for 12 V dc operating areas
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1.2 Application
Fixed point gas detection for safety monitoring in hazardous areas and general
purpose applications; for applications on data communication networks.
Intrinsically Safe:
TX6353.03
Supply Voltage:
12 V dc from an approved intrinsically
safe power source
General Purpose:
TX6353.04
Supply Voltage:
24 V dc
1.3 Product Options
TX6353 SentrO P Intrinsically
Safe Mining and
Tunnelling Ex
General Purpose
12 V dc TX6353.03 -
24 V dc -TX6353.04
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1.4 Dimensions
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1.5 Technical Information
TX6353.03
Intrinsically Safe Mining
and Tunnelling Ex
TX6353.04
General Purpose
Supply voltage 12 V dc 24 V dc
Supply voltage range 7.5 to 14.4 V dc 7.5 to 28 V dc
Current consumption electrochemical cell 20 mA
pellistor cell 55 mA
electrochemical cell 15 mA
pellistor cell 30 mA
Current consumption
with backlight
electrochemical cell 25 mA
pellistor cell 60 mA
electrochemical cell 20 mA
pellistor cell 35 mA
Output signal RS485 Modbus
Auxiliary alarm output
signal
0.4 to 2.0 V analogue output signal proportional to
the measured gas concentration value, for powering
a suitable local audio visual alarm unit
Gases detected Carbon monoxide at 0 to 50 ppm
Hydrogen sulphide at 0 to 50 ppm
Methane at 0 to 4% v/v
Nitric oxide at 0 to 50 ppm
Nitrogen dioxide at 0 to 20 ppm
Oxygen at 0 to 25% v/v
eModule working life Minimum 2 years, dependent upon eModule type
and monitoring conditions
1
2
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Operating temperature
range
-10 to +40°C
Storage temperature -20 to +60°C
Humidity 90% non-condensing
Housing materials Reinforced polymer. EMC protected and proof
against surface electrostatic charge
Protection classification Housing dust and waterproof to IP65
Gas port protected to IP54
Weight 550 g
Mounting Two 6.5 mm diameter fixing holes with Unistrut
6946 indents
Cable entries 2 x M20
Electrical connections 4 mm barrier/clamp terminals with circuit
segregation barriers
Conductors A maximum of two per terminal
Conductor size A maximum of 2 x 2.5 mm²
Terminal torque 2.4 Nm maximum
Information display 128 x 65 dot graphic LCD screen (Backlit)
Vibration limits (EN 61779) 10 to 200 Hz, 7g peak
Impact limits 20 joules (housing)
Calibration and setup Digitally controlled Zero and Span pushbutton setting
Signal fix The transmitted output signal of the sensor is Fixed
during calibration to prevent false alarms from being
initiated
Fault indication Under-range signal transmitted and Fault display for:
• Loss of communication between sensing
eModule and transmitter
• Critical reduction in sensor sensitivity
• Sensor over-range protection
Alarms Inbuilt adjustable visual alarm LEDs for General and
High alarms. Programmable setpoints and options
selectable from the setup menus
3
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1.6 Electrical Details
TX6353.03 TX6353.04
Output signal RS485
Supply voltage 7.5 to 14.4 V dc 7.5 to 28 V dc
Supply current no backlight:
electrochemical sensor
pellistor sensor
20 mA
55 mA
15 mA
30 mA
RS485 protocol Modbus to system requirements
Auxiliary Output for Powering a Local Audio Visual Alarm
Output signal 0.4 to 2 V for the measured gas concentration
Minimum line load 10 Kohm
Power for the audio visual alarm can be supplied from the sensor
Checkpoint
The TX6353 12 V dc version of the sensor is certified intrinsically safe and may
be located in the hazardous area when used in conjunction with approved
intrinsically safe apparatus.
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1.7 Sentro eModules
Plug-in pre-calibrated eModules with standardised output data.
• Each eModule stores all the necessary data about its type identification, sensing
range and specific calibration. This data is automatically recognised by SentrO P
when the eModule is loaded into the module bay.
• The eModules are pre-calibrated so can be substituted at any time by a
replacement eModule – usually of the same type, but an alternative may be
inserted if required.
• The sensing eModule will identify itself when plugged into the sensor housing
and auto configuration will take place.
• All Sentro eModules have two output alarm signals for General alarm and High
alarm. Default values are entered during manufacture and these can be changed
to preferred values.
• The General and High alarm signals illuminate built-in flashing LED indicators
located at the right hand side of the LCD screen window.
Sentro eModule
Gas Sensor
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1.7.1 Sentro eModules
For the full range of Sentro eModules contact the Trolex Sales Team:
[email protected]
1.7.1.1 Flammable Gases • Poison Resistant Catalytic Sensor
The sensor will respond to most flammable gases and vapours
to varying degrees; it is calibrated to methane in terms of %volume.
TX6350 .01.246.DP
Methane
CH4
Sensing element Poison resistant pellistor with active temperature/humidity
compensation
Sensing range 0 to 4% v/v
Linearity Linear to 3% v/v, 3% to 4% ±0.25% v/v
Max. Drift @ 25°C ±0.25% CH4 v/v per month
Response time (T63) <15 secs
Response time (T90) <20 secs
Sensing element life >5 years in clean atmosphere
Warm up time <5 mins in air or 1% v/v CH4
(to 95% of stated accuracy)
GENERAL alarm 10% LEL (0.44% v/v)
HIGH alarm 20% LEL (0.88% v/v)
Checkpoint
The pellistor is automatically protected against exposure to excessively high
concentrations of gas.
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1.7.1.2 Toxic Gases • Electrochemical Cells
TX6350 .01.250.50.
DP
.01.251.DP .01.257 .01.254.DP .01.259.DP
Carbon
Monoxide
CO
Hydrogen
Sulphide
H2S
Oxygen
O2
Nitrogen
Dioxide
NO2
Nitric
Oxide
NO
Sensing
element Electrochemical cell
Sensing range 0 to 50 ppm 0 to 50 ppm 0 to 25% v/v 0 to 20 ppm 0 to 50 ppm
Linearity ±2% FS ±2% FS ±5% FS ±2% FS ±5% FS
Drift 2% per
month
2% per
month
10% per
year
2% per
month
2% per
month
Repeatability ±2%
Response
time T63% <20 secs <30 secs N/A <20 secs <20 secs
Operating life 2 years 2 years 2 years 2 years 2 years
Relative
humidity 15 to 90% non-condensing
Operating
temperature -10 to +40°C
GENERAL
alarm 15 ppm 5 ppm 19% (under) 5 ppm 5 ppm
HIGH alarm 30 ppm 10 ppm 23% (over) 10 ppm 20 ppm
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Checkpoint
All values listed are nominal and slight variations may occur depending upon
operating conditions.
• The natural level of oxygen available in the atmosphere is influenced by
relative humidity and temperature. The oxygen sensor will react to these
changes.
• Sudden changes in atmospheric pressure will also cause temporary
instability in electrochemical sensors.
• Long periods of use in extremely high or low humidity may affect the
response of the sensor and shorten the life of electrochemical sensors.
• Gas sensing eModule type TX6351.259.DP (nitric oxide) must be constantly
powered-up to maintain calibration stability. If the eModule is
powered-down for more than 10 minutes, it could take 24-48 hours before
stability is restored. Do not calibrate until the output signal is steady.
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2. Certification
2.1 Pennsylvania State
Pennsylvania:
Pennsylvania Department of Environmental Protection - Bureau of
Mine Safety approved. Approval number: BOTE 63-13
24 V variant only
2.2 MSHA
Approved eModules:
The TX6353 SentrO P can only be used with the following
eModules:
Electrochemical cells:
TX6350.01.250.50.DP - Carbon Monoxide CO - 0 to 50 ppm
TX6350.01.251.DP - Hydrogen Sulphide H2S - 0 to 50 ppm
TX6350.01.257 - Oxygen O2- 0 to 25% v/v
TX6350.01.259.DP - Nitric Oxide NO - 0 to 50 ppm
TX6350.01.254.DP - Nitrogen Dioxide NO2- 0 to 20 ppm
Poison resistant pellistor:
TX6350.01.246.DP - Methane CH4 - 0 to 4% v/v
Conditions of Use:
1. Power for the TX6353 SentrO-P must be derived from a
supply previously evaluated by MSHA, a maximum output of
14.4 Vdc open-circuit voltage and 3.3 A short circuit current.
2. Do not disassemble the TX6353 SentrO P in an area where
permissibility is required, except to change the eModule.
3. The TX6353 SentrO-P must not be used as an air quality
detector.
4. Until such time it is tested for performance and listed by a
Nationally Recognized Test Laboratory, the TX6353 SentrO P is
not accepted by MSHA for compliance with 30 CFR 75.351 or
75.1103.
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3. Installing
3.1 Safety Precautions
Hazardous Areas
Do not disassemble the sensor whilst in the hazardous area or use a sensor that
has a damaged housing in the hazardous area.
Evacuation
If a dangerous level of gas concentration is detected by the instrument, leave the
area immediately.
Operating Life of Gas Sensors
Electrochemical cells contain an electrolyte that is gradually consumed during use.
The average life is about two years, dependant upon the duty cycle. The response
should be checked at regular intervals. Refer to Section 5 for details of Maintenance
to be carried out on the SentrO P.
Sensitivity
Electrochemical cells for toxic gases can be affected by other interfering gases
which may displace the subject gas being monitored. Steam laden atmospheres
and condensation can also reduce the sensitivity.
Flammable
Be aware that some toxic gases are also ‘flammable’ at high percentage
concentrations.
Operating Limits of Catalytic Combustion Sensors
Catalytic combustion gas sensors positively detect the presence of flammable gas.
They rely upon the presence of oxygen in the atmosphere and should only be used
for gas concentrations up to the Lower Explosive Limit (LEL).
After this point, the output becomes non-linear and may erroneously indicate
that the gas concentration is below the LEL. They should not be used in oxygen
enriched or deficient atmospheres.
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Discrimination
Catalytic combustion sensors can detect a wide range of flammable gases but they
cannot discriminate between individual gases. They will respond to most, or all,
of the flammable components present in the atmosphere without distinguishing
between them.
Infrared sensors are highly specific to the defined gas type and may NOT respond
to other similar gases.
Contamination
The response of catalytic combustion gas sensors can be affected by air borne
contaminants which will reduce the sensitivity. Substances such as silicones, tetraethyl
lead, sulphur compounds and phosphate esters can cause permanent degradation
(poisoning). Hydrocarbons may also cause temporary inhibition.
Interference
If the atmosphere to be monitored contains a gas that dilutes or displaces the
air, this may reduce the response of catalytic sensors. Similarly, steam laden
atmospheres and condensation can reduce the stability.
High Concentrations of Flammable Gas
Exposure of low concentration catalytic combustion sensors to concentrations of
flammable gas greater than the LEL can affect the sensitivity and zero stability of
catalytic elements and the calibration should be checked after such an exposure.
Toxicity
Be aware that most flammable gases and vapours are also toxic at low
concentrations of LEL.
3.2. Tools andTest Equipment Required
No special tools are needed.
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3.3. Siting Recommendations
Location of Gas Detectors
Each installation needs to be considered in its own right, with reference to safety
authorities and in compliance with mandatory local safety regulations. The sensor
must be operated in accordance with the User Manual to maintain safety, reliability
and to preserve safety integrity where applicable.
It is important that sensors are located in positions determined in consultation
with those who have specialised knowledge of the plant or installation and of the
principles of gas dispersion. Reference should also be made to those responsible
for the engineering layout and topology of the plant as they will be most familiar
with the nature of the potential dangers and the most likely sources of gas release.
It is also important to recognise that the characteristics of the gas source can be
influenced by many factors; including the relative density or buoyancy of the gas,
the pressure at the point of release, the ambient temperature and the ventilation of
the site.
Sensor coverage cannot be simply expressed in terms of ‘number per unit area’.
Sensors need to be sited where they are capable of monitoring those parts of a
plant where gas may accumulate or where a source of gas release is expected
to occur. This way, the earliest possible warning of a gas release can be given to
initiate shutdown functions, alarm functions or safe evacuation of the premises.
Sensor Management
A very important part of an efficient gas monitoring system is the training of
plant personnel in operation and maintenance of the sensors and the complete
monitoring system. Training can be provided by qualified Trolex application
engineers.
Once a sensor installation is complete, the sensor locations and types should be
formally recorded and a planned test and maintenance procedure instituted.
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3.4 Connections
3.4.1 RS485 Data Output Signal
Use in conjunction with a PC for data display
and setpoint alarm warnings. Up to 32
sensors acting as slaves can communicate
with the master unit on a single data cable.
Physical Layer RS485
Protocol
Trolex proprietary
Connection Mode
Modbus
Number of points
32
Maximum Distance
1000 m
Recommended cable for locally powered
sensors:
• 1 twisted pair
• 0.5 mm2
• Overall screen
Recommended cable for sensors that are
powered through the data cable:
• 2 twisted pair
• 0.5 mm2
• Individual/overall screen
3.4.2 Auxiliary Output Signal
The 0.4 to 2 V output can be used to trigger
an external audio/visual alarm. The output is
proportional to the gas level detected.
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4. Setup and Calibration
4.1. Controls and Indicators
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