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Forbes Marshall CODEL TunnelTech205, Operating Manual

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Forbes Marshall CODEL TunnelTech205 Operating Manual Download Page 30

Technical Manual 

 

 

Page 22 

 

 

 

 

CODEL

 

Issue : B 

Rev. : 1 

Date : 11/07/22 

Ref. : 100042 

 

 

 

Figure 16 : Set-Up Mode Tree 

 
6.10.2. Configure O/P 1 & 2 
 

 

 
 
 
 
 
The analogue current loop output is set up from this mode. Press the ENTER key while this display is shown to 
select it, then press the ARROW keys to step through the available options. Press the ENTER key to enter each 
option and change the displayed parameter. 
 

•

 

Base of Output 

 

 

 
The analogue output can represent the gas concentration in units of ppb 

– no adjustment. 

 

•

 

Output Span 

 

 

 
 
 

Summary of Contents for CODEL TunnelTech205

Page 1: ...RATING MANUAL TunnelTech205 Tunnel Atmosphere Air Quality Monitor for NO2 CODEL International Ltd Unit 4 Station Road Bakewell Derbyshire DE45 1GE United Kingdom t 44 0 1629 814 351 f 44 0 8700 566 30...

Page 2: ...Issue B Rev 1 Date 11 07 22 Ref 100042...

Page 3: ...and service engineers will assist with any application problem to ensure that the best possible use is derived from investment in CODEL quality products If you require any further information about CO...

Page 4: ...Technical Manual CODEL Issue B Rev 1 Date 11 07 22 Ref 100042...

Page 5: ...splay Unit TDU 9 5 2 Connections 10 5 2 1 Connection schedule for AQM TDU up to 100m apart 10 5 2 2 Connection Schedule J Box configuration 1 for AQM TDU up to 1km apart 11 5 2 3 Connection Schedule J...

Page 6: ...7 1 AQM NO2 29 7 1 1 Communications see also Appendix A for further information 29 7 1 2 Heater Control 29 7 1 3 Alignment 29 7 1 4 Gain Adjustment 29 7 1 5 Calibration NO2 30 8 Maintenance 31 8 1 Ge...

Page 7: ...ed throughout these instructions and are intended to ensure your safety while carrying out installation operation and maintenance procedures Please read these instructions fully before proceeding Caut...

Page 8: ...Technical Manual CODEL Issue B Rev 1 Date 11 07 22 Ref 100042...

Page 9: ...measurement The CODEL sensor is a precision transmissometer which measures the attenuation of blue light by NO2 in the tunnel atmosphere The light source is a simple LED and the interfering effects o...

Page 10: ...Technical Manual Page 2 CODEL Issue B Rev 1 Date 11 07 22 Ref 100042 Figure 1 System Arrangement...

Page 11: ...m within a measurement cell into which only gases can diffuse The NO2 monitor utilises a Single Wavelength Optical Transmissometer SWOT technique 2 1 1 2 Measurement Elements An LED is employed as the...

Page 12: ...ilters 2 1 1 4 Diagnostic Data Every second a complete measurement is determined for each of the detector levels and a refresh of the NO2 measured level is made Diagnostic data for each of the detecto...

Page 13: ...1 Date 11 07 22 Ref 100042 Zero calibration may be configured to be activated Manually from the TDU keypad Automatically from the TDU clock up to 1 week intervals Remotely from the TDU logic input vol...

Page 14: ...es selectable on set up Accuracy 40ppb Power 48V DC 36VA obtained from local data bus from TDU Communication local data bus Dimensions mm 180 x 1130mm see Figure 3 3 3 Tunnel Display Unit TDU Display...

Page 15: ...cable between the AQM reflector and the junction box 1 x Junction box for each AQM to IP66 specification suitable for 6 core cables and complete with 3 x cable glands 2 x Mounting brackets per AQM 1 x...

Page 16: ...st provided 5 1 1 NO2 Air Quality Monitor The NO2 monitor is secured horizontally to the tunnel wall using the brackets provided to support and clamp the measurement chamber The arrangement of the mon...

Page 17: ...method of connection in relation to the separation distance see Figure 9 and Figure 11 Where the TDU AQM are separated by up to 500m then the 48V supply may be connected directly into the TDU using 1...

Page 18: ...technician The following diagrams illustrate the connections for the equipment NOTE Only use the O P 3 and 4 1Amp outputs connections on the PSU 5 2 1 Connection schedule for AQM TDU up to 100m apart...

Page 19: ...eater than 100m then it is necessary to use a junction box due to voltage drop over long cable distances 5 2 2 Connection Schedule J Box configuration 1 for AQM TDU up to 1km apart Figure 8 J Box Conn...

Page 20: ...f 100042 5 2 3 Connection Schedule J Box configuration 2 for AQM TDU up to 200m apart Figure 10 J Box Connection Schedule Config 2 Figure 11 Alternative J box Connection Diagram RS485 4 20mA Mains pow...

Page 21: ...Technical Manual Page 13 CODEL Issue B Rev 1 Date 11 07 22 Ref 100042 Figure 12 Power Supply Unit Mains fuse Mains input connection 48V DC outputs 48v output fuses 6 TDU Operation 1 4...

Page 22: ...ted the calibration of the instrument is obtained at zero gas level 6 2 Normal Start Up Procedure Power up the system and leave it for two hours This allows time for the transceiver and reflector to h...

Page 23: ...sing the MODE key will either take the instrument to the next mode of operation or back to the operating mode if pressed from within a mode Arrow Keys Pressing the ARROW keys will do one of two things...

Page 24: ...mode is complex an extra program tree is illustrated Figure 14 Program Operation Tree 6 6 Operating Mode In this mode of operation displayed gas concentration may be observed When in this mode the dis...

Page 25: ...ined here Protocol Displays the protocol selected for the serial communications output either Codel for connection to Codel s own software or MODBUS for connection to standard MODBUS system Baud Rate...

Page 26: ...of the display the main display will show Not applicable 6 9 Diagnostic Mode Mode 4 The detector levels temperature data Y Z values NO2 values cal data and the fault condition may be examined from th...

Page 27: ...m operation this parameter and the resulting raw gas calculation may be interrogated here Z is the Y value after the application of any necessary corrections s indicates that the smoothing filter has...

Page 28: ...ition Dr Low the detector Dr is too low for correct operation Dt Low the detector Dt is too low for correct operation Dr High the detector Dr is too high for correct operation Dt High the detector Dt...

Page 29: ...its span rolling average and fault condition Alarm 1 2 source and level set up Parameters the following are set from this mode security code comms I D protocol baud rate and clock Calibrate the zero c...

Page 30: ...output is set up from this mode Press the ENTER key while this display is shown to select it then press the ARROW keys to step through the available options Press the ENTER key to enter each option a...

Page 31: ...ressing the ARROW keys when the desired option is displayed press the ENTER key Set mA Output This is set at the factory and should not be altered without due consideration From this option the curren...

Page 32: ...Technical Manual Page 24 CODEL Issue B Rev 1 Date 11 07 22 Ref 100042...

Page 33: ...en Alarm 2 condition is reached the red LED on the TDU is unaffected Alarm relay 2 is energised with the alarm condition cleared Both alarm relays are fail safe in the event of a power outage of the N...

Page 34: ...unications address identity number 6 10 6 Protocol This is used to select the required serial communication protocol ModBus for standard MODBUS CODEL for Codel s own diagnostic software 6 10 7 Baud Ra...

Page 35: ...iated from here as follows Auto Cal Initiate Cal Timer Interval Cal Alarm Logic Logic Yes Next Cal Input Exit Exit No Exit o Initiate allows selection of automatic zero calibration operation o Cal Tim...

Page 36: ...al Manual Page 28 CODEL Issue B Rev 1 Date 11 07 22 Ref 100042 o Logic Input NO option inhibited o Cal Alarm YES this will switch Alarm 1 relay when the calibration routine is in progress NO option in...

Page 37: ...is required on site then final alignment is carried out by optimising the mechanical alignment of the sensor and reflector on the tube until the maximum signal is obtained 7 1 4 Gain Adjustment The d...

Page 38: ...detector data are correct the sensor may be calibrated from the Calibration sub menu in the TDU set up mode Set the number of calibration cycles to 200 then calibrate The monitor will now calibrate t...

Page 39: ...General The equipment is designed for low maintenance The sensors utilise the latest microprocessor technology and have no moving components they require no routine maintenance 8 2 Emergency Shutdown...

Page 40: ...5 serial port in the TDU Figure 18 NO2 AQM system configuration 9 1 2 Processor Architecture Each NO2 sensor has two processors organised as a master slave pair In each case the master processor handl...

Page 41: ...On this board is mounted a hexadecimal rotary switch for setting the address code Allowable addresses are in the range 1 to 8 and this is normally set to 1 at the factory The location of the address s...

Page 42: ...ithout Junction Box 10 Figure 8 J Box Connection Schedule Config 1 11 Figure 9 Overall Connection Diagram 11 Figure 10 J Box Connection Schedule Config 2 12 Figure 11 Alternative Connection Diagram 12...

Page 43: ...of 125 registers can be accessed per request The formats of the request and response frames are detailed below where X and n are hexadecimal variables An example of a MODBUS register map is shown bel...

Page 44: ...AEG Modicon Modbus Protocol Reference Guide PI MBUS 300 Rev D Each register is defined to be 2 bytes wide Modbus Register Location 0070h NO2 Data 0001h 1ppb 0064h 100ppb Data Register Locations at COD...

Page 45: ...Not Used 0073 Not Used 0074 Not Used 0075 Not Used 0076 Data Valid instantaneous XXXX logic XX00 valid else invalid XXXX 0077 Data Valid Calibration Status instantaneous XXXX logic 00XX data valid XX0...

Page 46: ...Section page Description New Revision 17 03 22 Front cover Front cover update A6 23 05 22 YM request Front cover Title changed from Technical manual to Operating Manual A7 11 07 22 Pm741 6 9 1 analyse...

Page 47: ...Technical Manual Page 39 CODEL Issue B Rev 1 Date 11 07 22 Ref 100042...

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