User Guide
Contents
1. Run the SM70 for 24 hours in clean air Move SM70 to a clean environment Replace sensor board Run the SM70 for 24 hours in clean air Move the sensor to clean air environment Replace sensor board Gas concentration is lower than expected Do span check Do span check Gas concentration is higher than expected Do span check Do span check Replace power supply Shield unit from airflow Shield unit from interference 11 MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 WW CTEE SING OOM Sensor type Sensor specifications Sampling method Operational mode Operating temperature Operating relative humidity Warm up time Display Relay set point Digital output Analog output Relay output Buzzer alarm optional Power supply Enclosure rating Enclosure dimensions Enclosure casing Enclosure mounting Weight Approvals Aeroqual Lid www aeroqual com Analytic GSS Technology Gas Sensitive Semiconductor G2 0 o 97 vi 8 Specifications Available with ozone or VOC sensors in various ranges Please refer to sensor specification table at www aeroqual com Active sampling Continuous Control or Alarm 0 C to 40 C 10 to 90 non condensing 10 minutes 3 5 digit LCD User configurable RS232 and RS485 0 5 VDC 8 bit 24 V 5A max Internal piezo 85 db 30 cm 12 VDC 800 mA Plug in AC power adaptor supplied IP20 amp NEMA 1 equivalent 130 W x94Hx57D mm 5 2ZWx3 Hx22. air connected to R42 5 2 Span Check Procedure If necessary charge R42 Calibration Gas Humidifier with 5g of water with water syringe via water inlet Connect span gas cylinder and regulator to R42 gas inlet with tubing Place the R42 outlet over the SM70 sensor Flow span gas air into R42 until the SM70 reading stabilises typically 10 minutes If the SM70 does not respond correctly then the sensor board should be replaced WV ax c9 I 6 Maintenance The SM70 is designed to be a low maintenance instrument with no user serviceable components It is recommended that the SM70 be zero and span checked at regular intervals monthly if possible to ensure on going responsiveness The sensor board needs to be replaced with a calibrated board annually Aeroqual Ltd March 2013 9 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 QelOQUAL WW TEE SING CIH 6 1 Replacing the Sensor Board e Unscrew the four lid screws and remove lid e Unscrew sensor board using a 5 5mm hexa socket screwdriver and remove cabling Keep the screws nuts washers and standoffs for re use e Connect cabling to new sensor board and re attach to enclosure lid Connect new board ssassn LRT ee T Gene rest on connectors Make sure board does not Ln Place board in enclosure ensuring screws slide through both holes so board is resting on the plastic standoffs underneath Use 5 5mm Hexa Socke
3. device WWW TEESIHEB CUOMN aoo cm tikk i cr VIN Nt rin 100 EN E 0 BURGN TX RX A G cor J GN EXTERNAL RS232 RS485 RELAY POWER DEVICE LA e g O3 generator Insert jumper wire between Com and GND Insert diode in circuit to Diode A IN4004 suppress back EMF External relay must be suitably rated to switch the external load Operating voltage of relay coil must be LNE 12 VDC 240 VAC 4 4 0 5VDC Analog output The gas concentration is available as a 0 5V signal at the 0 5V and AGND connectors on the screw terminal block 0 volts zero ppm and 5 V designated range of sensor for example a 0 0 5 ppm Os SM70 module would output 5V at 0 500 ppm ozone The resolution of the analog signal is 8 bit NOTE the 0 0 150ppm O3 sensor analogue output is 1 5V at 0 150ppm full scale All other sensors output 5 0V at full scale 4 5 Serial communications Gas concentration data is available on the RS232 and RS485 digital communication channels The RS485 channel is 2 wire the RS232 is 2 wire plus GND Connection is via the screw terminal connectors on the sensor board The communication protocols for these serial interfaces are provided in the Appendix Please note the RS232 serial protocol is a proprietary format and is not ASCII Hence a terminal program cannot be used to communicate with the SM70 Aeroqual Ltd March 2013 8 www aeroqual com MRK D 0017 V1 WWW TEESING CO
4. the selected set point Typical applications are fail safe warning systems or controlling a gas generator Relay open de energised Set Point Relay closed energised e When gas concentration is rising from below the Set Point relay energised relay NO closed NC open e When gas concentration rises and reaches the Set Point relay is de energised relay NO open NC closed e When gas concentration drops and reaches the Set Point relay energised relay NO closed NC open C10 The relay is programmed to open and close around the selected control set point 10 to create a control band Typical application is for maintaining a specific gas concentration between user defined levels through the control of an external device e g ozone generator TI Laseeneccmec esee e Becomes eee E E Relay closed Relay open 1 Software Dead Band of 10 of set point 100 Set Point 90 zie Aeroqual Ltd March 2013 6 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 qAeroQUAL e When the gas level is rising from below Lower Limit to Upper Limit relay is energised NO closed NC open e When gas level is falling from above Upper Limit to Lower Limit relay is de energised NO open NC closed WWW TEESIHEB CUMN 4 3 1 Setting the Relay and Alarm Set Point The Relay Set Point can be altered by adjusting the set point dip switches as shown below The Rel
5. D in Flame resistant thermoplastic PS Screw fix lt 270 g 9 5 oz excludes AC power adaptor Part 15 of FCC Rules EN 61000 6 3 2001 EN 61000 6 1 2001 FC CE March 2013 WWW TEESING COM 431 70 413 07 50 12 MRK D 0017 V1 QelrOQUAL WWW TEESIHEB CUN Appendix 1 Copyright Copyright Aeroqual Limited All rights reserved Reproduction transfer distribution or storage of part or all of the contents of this document in any form without the prior written permission of Aeroqual Limited is prohibited Terms and Conditions This product is warranted according to Aeroqual Ltd s Terms of Trade For further warranty information please refer to the standard Product Warranty Policy as published on the Aeroqual website at www aeroqual com Aeroqual operates a policy of continuous development Aeroqual reserves the right to make changes and improvements to any of the products described in this document without prior notice Under no circumstances shall Aeroqual be responsible for any loss of data or income or any special incidental consequential or indirect damages howsoever caused The contents of this document are provided as is Except as required by applicable law no warranties of any kind either express or implied including but not limited to the implied warranties of merchantability and fitness for a particular purpose are made in relation to the accuracy reliability or contents of this document Aer
6. M 431 70 413 07 50 qeroQUAL WW TEE SING CIH 5 Calibration The SM70 can be fully calibrated by replacing the old sensor board with a replacement SM70 sensor board with a multi point calibration and new calibration certificate Alternatively a SM70 baseline calibration can be undertaken by the user following procedure 5 1 Always undertake a zero calibration before doing a span check The SM70 span response can be checked by the user following procedure 5 2 In order to calibrate successfully the following equipment is needed R42 Calibration Gas Humidifier Aeroqual accessory Inert tubing between regulator to R42 eg PFA tubing 0 5 LPM constant flow regulator eg Calgaz regulator model 715 flow rate 0 5 LPM Zero grade air cylinder or zero air generator Span gas in air cylinder or ozone source R42 calibration accessory 5 1 Zero Calibration Procedure 1 If necessary charge R42 Calibration Gas Humidifier with 5g of water with water syringe via water inlet 2 Connect zero air cylinder and regulator to R42 with tubing 3 Remove the lid of the SM70 and detach the sensor board to locate the Zero Cal button 4 Place the R42 outlet over the SM70 sensor 5 Flow zero air into R42 until the SM70 reading stabilises about 10 minutes 6 Initiate Zero Calibration on the Aeroqual SM70 by pressing the button on the sensor PCB marked zero cal 7 Wait 5 minutes for the process to be completed Zero
7. SM70 relay and data output connectors Cable gland for RS232 or RS485 connection Aeroqual Ltd March 2013 4 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 QelOQUAL WW TEE SING CIH 4 Input and Output signals 4 1 Sensor Board Switches The SM70 sensor board contains a number of buttons LEDs and a dipswitch which are accessible once the sensor board is detached from the lid See section 6 0 4 1 1 ZERO CAL This button activates a zero calibration routine on the sensor It should only be pushed when you are performing a zero calibration 4 1 2 RESET This button resets the SM70 microcontroller without needing to remove the power from the SM70 4 1 3 SPAN This button will change the span calibration of the SM70 and should not be activated for any reason 4 1 4 RELAY Dipswitch The Relay dipswitch changes the set point for activation of the SM70 relay See section 4 3 for a description of the concentration set points 4 2 Sensor Board LEDs 4 2 1 Status LED Normal and Failure modes The status LED glows green and is located on the Sensor board At start up the Status LED will flash 2 to 6 times at an interval of 0 5 seconds During the 3 to 10 minute warm up time the Status LED will flash at an interval of 2 seconds Normal status Constant on Sensor Failure Flashes quickly at an interval of 0 3 seconds 4 2 2 Relay LED The relay LED glows red and is also located on the Sensor
8. TEESING 4 deroQUAL WWW TEESIMEB CUMN SM70 Monitor User Guide GES lt SM70 MONITOR Aeroqual Ltd March 2013 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 QelrOQUAL Contents COMORES 2 For Your Safety ERE m 3 1 SM70 COMORES 2 en 3 2 About Your Monitor Controller ocio rads aenadeceseeunduenvadeuueemeundbeenuceuueucuseeceein 3 J MUL UING Sole PEE ea eee ce cee a nce ec eee vacneetatee een eae tveedcs 4 edi WS TUDO FA een en danse eee tes men deteste eee ee de en e 4 3 2 Turning the monitor on and off sise 4 33 WamminNg UD A E O E R E E 4 3 4 External Wiring through the Cable Glande 4 4 input and Output signals ooo seers cccdssccssevencoveguessnonreeetownserescederewcosasusextavmevtasendiarenseeeueusavarieedes 5 AA Sensor Board SWIHCNES ertet hte etiat rtr bn na 0E Rbnd eei ssssedenen esse ERE a ud U Ebedeeak uda iride Eod ense pidas 5 OO E EE E E A 5 M A E E E E 5 4 1 3 TE 5 4 1 4 RELA Y M m m 5 42 Sensor Board LEDS a a ae entame 5 4 2 1 Status LED Normal and Failure modes cccceceeeeeee eee eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeaaaaaes 5 Bee POOLED n 5 Dow 5 4 3 1 Setting the Relay and Alarm Set Point 7 4 3 2 Wiring to the relay ssssessssssssseseeeenneeenn nennen nennen n
9. ay Set Point is factory set unless otherwise specified to OFF ON OFF ON The setpoint levels for different dipswitch settings are provided below for some sensors Contact Aeroqual if your sensor is not listed Table Dipswitch setpoint levels ME 2 3 4 0 0 150 ppm 0 0 5 ppm 0 mm E 0 500 ppm 0 25 ppm onononon on on on 000 000 000 000 a ae a a coh OU OUS tS OOR CDEC MENE M moon 000 osso s e woo ooo oms 385 mw 7 omononot 000 ozo 4 w e onono 00 ozs 45 9 s moont ono oso 6 w otonotot Ou oso s se 16 mototo ono osso 09 a0 Factory default setting 4 3 2 Wiring to the relay If you require the SM70 be used to control a mains powered device you will need to include a separate mains rated relay Mains equipment should only be wired by a certified electrician Open up the SM70 enclosure and remove the PC board as detailed in section 6 Turn over the PCB board so that the underside is visible as shown below Using the screw connector on the PC board wire the desired external device to either the normally open or normally closed contacts as required for your application and firmware version Feed the cable through the supplied cable gland to your external devices Aeroqual Ltd March 2013 7 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 qeroQUAL Diagram showing a method of connecting a SM70 to a mains powered
10. board This LED comes on when the relay is energised 4 3 Relay The SM70 sensor module can be used as a simple gas sensitive relay switch to control devices or activate alarms using the on board relay The relay has COM common NO normally open NC normally closed contacts Three SM70 relay control firmware programs are available AA AB C10 The user should have specified the program installed prior to delivery The relay logic of the three firmware versions is described below External equipment connected to the on board relay should be wired appropriately to the normally open or normally closed contacts AA Alarm Above the relay is programmed to energise above the selected set point Typical applications are health and safety alarm warning systems or switching external equipment on and off This is the default software Aeroqual Ltd March 2013 5 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 TEESING WWW TEESIMEB CUOMN qeroQUAL Relay closed energised Set Point Relay open de energised e When gas concentration is rising from below the Set Point relay de energised relay NO open NC closed e When gas concentration rises and reaches the Set Point relay is energised relay NO closed NC open e When gas concentration drops and reaches the Set Point relay de energised relay NO open NC closed AB Alarm Below the relay is programmed to energise below
11. e parts Return unit to Aeroqual or your Distributor for servicing Use only approved accessories When connecting to any other device read the appropriate user guide for detailed safety instructions Do not use the SM70 in or near flammable fuel or chemicals 1 SM70 Components The following components are supplied with the SM70 Monitor SM70 Monitor 12 VDC AC DC adaptor Enclosure mounting brackets User guide Please check that all these components have been supplied and contact your dealer or Aeroqual on email at sales aeroqual com if any of the components are missing 2 About Your Monitor Controller The Aeroqual SM70 Monitor is designed for monitoring of gases in an indoor environment It is supplied with three different versions of firmware which control the internal relay in different ways depending on the application see table below The version installed is indicated on an internal label under lid Please ensure you have the version you require Table 1 SM70 firmware versions and description Firmware Description S Alarm above the relay is energised when the reading is above the setpoint Alarm below the relay is energised when the reading is below the setpoint C10 Control the relay is energised to control the gas concentration to a band within 1096 of the setpoint The SM70 is supplied pre drilled with a cable gland to facilitate connection to the relay and communication ter
12. e the data stream s check sum that makes the command stream total sum is zero 2 SM70 sensor information request command Command BASE SENSOR INFO RESERVED CHECKSUM Reply SENSOR SENSOR INFO VERSION NO DISPLAY NMAE LENGTH SENSOR NAME RESERVED CHECKSUM BASE 1 byte information request command header see section 2 for its value SENSOR 1 byte monitor reply data stream header see section 2 for its value SENSOR INFO 1 byte command see section 2 for its value VERSION NO 1 byte sensor version number see section 2 for its value DISPLAY 1 byte gas concentration value display format type see section 2 for its value NAME LENGTH 1 byte specify the sensor name byte length SENSOR NAME 7 bytes the gas sensor name ASCII code its valid bytes are specified by NMAE LENGTH RESERVED 1 byte CHECKSUM 1 byte the data stream s check sum that makes the command stream total sum is zero Section 2 Aeroqual Ltd March 2013 16 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 qeroQUAL WWACTEESIHG CIH Protocol command values are in hexdecimals not ASCII BASE 20x55 header command used for receiver command SENSOR 0xAA header command used for monitor reply DATA REPORT 0x10 regular data report command DATA REQUEST 2 0x1A heater data request report command SENSOR INFO 0xFB parameters upload command RESERVED 0x00 the byte not been used for information transfe
13. egular data report command the data report interval varies with sensor It is 15 bytes data stream SENSOR DATA REPORT DATA1 DATA2 DATAS RESERVED2 STATUS1 STATUS2 CHECKSUM SENSOR 1 byte monitor reply data stream header see section 2 for its value DATA REPORT 1 byte data report command see section 2 for its value DATA 4 bytes floating point data gas concentration value DATA2 2 bytes unsigned int used for optional sensors of temperature reading its value scaled up by 10 that means if the reported value is 256 then the actual reading is 25 6 Celsius degree DATAS 2 bytes unsigned int used for optional sensors of relative humidity reading its value scaled up by 10 that means if the reported value is 515 then the actual reading is 51 5 RESERVED is 2 bytes reserved STATUS 1 byte sensor status indication refer section 3 for details STATUS2 1 byte sensor status indication refer section 3 for details CHECKSUM 1 byte the data stream s check sum that makes the command stream total sum is zero 2 SM70 sensor information request command Command RECEIVER SENSOR INFO RESERVED1 CHECKSUM Reply SENSOR SENSOR INFO VERSION NO DISPLAY NMAE LENGTH SENSOR NAME RESERVED2 CHECKSUM RECEIVER 1 byte information request command header see section 2 for its value SENSOR 1 byte monitor reply data stream header see section 2 for its value SENSOR INFO 1 byte command see sect
14. ion 2 for its value VERSION NO 1 byte sensor version number see section 2 for its value DISPLAY 1 byte gas concentration value display format type see section 2 for its value NAME LENGTH 1 byte specify the sensor name byte length SENSOR NAME 7 bytes the gas sensor name ASCII code its valid bytes are specified by NMAE LENGTH RESERVED 1 bytes reserved use value 0x00 RESERVED 2 bytes not used CHECKSUM 1 byte the data stream s check sum that makes the command stream total sum is zero 3 SM70 sensor concentration ppm to mg m3 conversion factor request command Command RECEIVER CONVERT FACTOR RESERVED1 CHECKSUM Reply SENSOR CONVERT_FACTOR FACTOR RESERVED8 CHECKSUM SENSOR 1 byte monitor reply data stream header see section 2 for its value CONVERT_FACTOR 1 byte command see section 2 for its value FACTOR 4 bytes floating point conversion factor value see section 3 for details RESERVED 1 bytes reserved use value 0x00 RESERVEDS 8 bytes reserved CHECKSUM 1 byte the data stream s check sum that makes the command stream total sum is zero Aeroqual Ltd March 2013 14 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 QelrOQUAL WWW TEESIHEB CUON 4 SM70 sensor zero calibration command 4 bytes Command RECEIVER ZERO CAL RESERVED1 CHECKSUM ZERO CAL 1 byte 0x12 command to start zero calibration for the sensor see section 2 for its val
15. minations T The SM70 is a sensitive instrument and should not be exposed to steam N water chemical spray or high levels of dust Doing so may significantly shorten the life of the sensor Aeroqual Ltd March 2013 3 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 TEESING 4 QeroQUAL MMMLTEESINE CIH 3 Getting Started 3 1 Installation Wall mounting brackets are provided and fit into the holes at each corner of the enclosure see picture below Concealed tamperproof screw fixing through the corner posts of the enclosure is also possible without using the fixing brackets The SM70 should be installed at a location that is free from contaminants that might affect the performance of the sensor module 3 2 Turning the monitor on and off The SM70 is designed to run constantly To turn the monitor on simply plug in the 12 VDC cable from the AC adaptor and turn on at the mains switch To turn the SM70 off switch it off at the mains switch 3 3 Warming up The SM70 sensor sometimes requires warming up to achieve a stable baseline It has an inbuilt warming cycle of about 3 minutes but may need longer to under certain conditions If it is the first time the monitor has been powered on it is recommended to run it for a period of a few hours before use 3 4 External Wiring through the Cable Gland The SM70 enclosure is pre drilled and fitted with a cable gland to facilitate a cable connection to the
16. n nnne nnns nnn nnne nnn nnn 7 4 4 0 5VDC Analog OutpuUt ssssesessisseseeseeeeennne nennen nennen nenne nnn nnn nnns ann nnns nna nnn nnns 8 4 5 Serial communications ccccsesseecccssesseececnsasseecccseassansecseasseeeenseaseessensoaseeseessagsensestsagsensenses 8 MEE e e211 C0 NR Eo 9 5 1 Zero Calibration Procedure iii 9 5 2 Span Check Procedure ccccccccccccssssecceceeeeeaeeseeeceeeeeeeeeeeeeeeeeeeeseeeeeeeeeeeesseaeaeeeeeeeeessaeaaeses 9 G Mamenang oee ea a ne 9 6 1 Replacing the Sensor Board 10 7 TIOUDIGSHOOHNNO MER RR 11 i edle eer 12 POS IN T re 13 COR E EA PE A A E TE 13 Temis and ere dele E TN 13 Statements ol COMMON ING Ro ee de 0 red esp dns 13 AP PONO d Mc 14 Serial COMMUNICATION Protocols 2 5 14 Ror 720 aisi MT 14 aid M 16 Aeroqual Ltd March 2013 2 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 qeroQUAL WW TEE SING CIH For Your Safety The Aeroqual SM70 Monitors are used to monitor ambient gas concentrations Aeroqual does not guarantee user safety In hazardous environments an appropriate Health and Safety plan should be in place The SM70 contains no user serviceabl
17. on ReservedO bO Reserved not been used Reserved1 b1 Reserved not been used Zeroing b2 0 sensor normal working mode b2 1 sensor zeroing Reserved2 b3 Reserved not been used Reserved3 b4 Reserved not been used Reserved4 b5 Reserved not been used Reserved5 b6 Reserved not been used Reserved6 b7 Reserved not been used Section 3 Data value format representation The floating point data values use IEEE754 32 bits floating point little ending representation They are DATA1 and FACTOR Section 4 Data transfer mechanism 1 Due to the monitor main chips feature 4 bytes floating point data and 2 bytes int data send sequence are low byte first high byte last such as section 3 data DATA1 DATA2 ADAT3 and FACTOR 2 For regular data report The SM70 sensor will automatically send out a measured data result to the RS232 serial port according to sensor type The data report interval will vary with different sensors The longest report interval is about 2 minutes the shortest one is only 2 seconds Please ask Aeroqual for this information when needed Aeroqual Ltd March 2013 15 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 QelrOQUAL WWW TEESING COH Section 5 RS232 communication port settings Baud rate 9600 Data bits 8 Stop bits 1 Parity none Flow control none RS485 Protocol The Aeroqual SM70 sensors digital information output is available on RS485 These command pro
18. oqual reserves the right to revise this document or withdraw it at any time without prior notice The availability of particular products may vary by region Please check with the Aeroqual dealer nearest to you Statements of Compliance The Aeroqual SM70 complies with EN 50082 1 1997 The Aeroqual SM70 complies with EN 50081 1 1992 The Aeroqual SM70 complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 these devices may not cause harmful interference and 2 these devices must accept any interference received including interference that may cause undesired operation Aeroqual Ltd March 2013 13 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 TEESING WWW TEESIHEB CUON QelOQUAL Appendix 2 Serial Communication Protocols RS232 Protocol The Aeroqual SM70 digital information output is based on the following RS232 protocol These command protocols are specified by Aeroqual Limited all rights reserved Aeroqual reserves the right to change the protocol without notification Version 2 2 Date 23 09 2009 Added zero calibration function Combined with temperature and relative humidity sensor data Section 1 Descriptions of communication commands for data format and representations please refer to section 3 Comma and spaces are not applied for every command and reply data stream they are just used for clearly specifying data stream 1 SM70 sensor r
19. r CHECKSUM a data stream s check sum that makes the command stream total sum is zero DISPLAY display format can be following 0x01 1 digit int 3 decimal points eg 0 500 ppm 0x02 2 digits int 2 decimal points eg 12 20 ppm 0x03 3 digits int 1 decimal point eg 126 8 ppm 0x04 4 digits int no decimal point eg 2888 ppm STATUS 8 bits monitor and sensor status information SS0 b0 00 sensor working fine SS1 b1 01 sensor failure 11 sensor aging Reserved1 b2 Reserved not been used Reserved2 b3 eserved not been used Reserved3 b4 Reserved not been used Reserved4 b5 Reserved not been used Reserved5 b6 Reserved not been used Reserved6 b7 Reserved not been used Section 3 Data value format representation The floating point data values use IEEE754 32 bits floating point little ending representation They are DATA1 DATA2 Section 4 Data transfer mechanism Due to the monitor main chips feature 4 bytes floating point data and 2 bytes int data send sequence are low byte first high byte last such as section 3 data DATA1 and FACTOR Section 5 RS485 communication port settings Baud rate 4800 Data bits 8 Stop bits 1 Parity none Flow control none Aeroqual Ltd March 2013 17 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50
20. t Screwdriver or Small Grip gt Pliers to tighten nuts i N B Remember to replace the brown washers Use Flat Screwdriver to hold _ gt screw in place during Aeroqual Ltd March 2013 10 www aeroqual com MRK D 0017 V1 WWW TEESING COM 431 70 413 07 50 TEESING WWW TEESIHEB CUMN T Troubleshooting A fault diagnosis table is given below Please consult this in the first instance to help diagnose a suspected fault If you are unable to find the fault in the table or the suggested remedy does not work please contact Aeroqual s Technical Support by sending an email to technical aeroqual com This automatically generates a ticket which will be acted upon by a Technical Support Person Faut Possible causes Remedy No Power Sensor failure Status LED flashes quickly Reading high in clean air Reading lower than expected Reading higher than expected Reading unstable Aeroqual Ltd www aeroqual com Power supply failure SM70 damaged Sensor needs warming up Air contaminated SM70 sensor damaged Insufficient warm up Air contaminated Sensor damaged Sensor correct Interferent gas present Sensor calibration incorrect Sensor correct Interferent gas present Sensor calibration incorrect Power supply unstable Local airflow is unstable EMF interference is high March 2013 QelOQUAL Replace 12 VDC plug pack Replace sensor board
21. tocols are specified by Aeroqual Limited all rights reserved Aeroqual keep the rights to change the protocol without notification Version 1 0 Date 05 12 2008 Section 1 Descriptions of communication commands for data format and representations please refer to section 3 Comma and spaces are not applied for every command and reply data stream they are just used for clearly specifying data stream Aeroqual SM70 sensor module RS485 protocol is a slave mode Master receivers need send request command to get response 1 SM70 sensor data request command it is 4 bytes data stream BASE DATA REQUEST RESERVED CHECKSUM example 0x55 0x1A 0x00 0x91 Reply data stream is 15 byte SENSOR DATA REPORT DATA1 DATA2 RESERVED STATUS1 STATUS2 CHECKSUM The second byte DATA REPORT will be either Ox1A or OxOF or 0x10 Only if DATA REPORT 0x10 will DATA be a valid concentration reading SENSOR 1 byte monitor reply data stream header see section 2 for its value DATA REQUEST 1 byte heater data report see section 2 for its value DATA REPORT 1 byte gas concentration data report command see section 2 for its value DATA 4 bytes floating point data when command reply is DATA REPORT this value is gas concentration in ppm DATA reserved RESERVED is 2 bytes data space reserved STATUS 1 byte monitor and sensor status indication refer section 3 for details STATUS2 1 byte reserved CHECKSUM 1 byt
22. ue RESERVED 1 bytes reserved use 0x00 CHECKSUM 1 byte the data stream s check sum that makes the command stream total sum is zero During zero calibration SM70 status LED will slowly flash once the flash finished zero calibration finished too Section 2 Protocol command values RECEIVER 0x55 header command used for receiver command SENSOR OxAA header command used for monitor reply DATA REPORT 0x10 regular data report command ZERO CAL 0x12 zero calibration command SENSOR INFO 0xFB parameters upload command CONVERT FACTOR 0x2A update monitor real time clock RESERVED 0x00 the byte not been used for information transfer CHECKSUM a data stream s check sum that makes the command stream total sum is zero DISPLAY display format can be following 0x01 1 digit int 3 decimal points eg 0 500 ppm 0x02 2 digits int 2 decimal points eg 12 20 ppm 0x03 3 digits int 1 decimal point eg 126 8 ppm 0x04 4 digits int no decimal point eg 2888 ppm STATUS1 8 bits monitor and sensor status information SSO bO 00 sensor working fine SS1 b1 01 sensor failure 11 sensor aging for O3 LOW sensor only Reserved1 b2 Reserved not been used Reserved2 b3 Reserved not been used Reserved3 b4 Reserved not been used Reserved4 b5 Reserved not been used Reserved5 b6 Reserved not been used Reserved6 b7 Reserved not been used STATUS2 8 bits monitor and sensor status informati
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