Custodian user manual
Contents
1. The instrument will now display the peak reading of any sensor lowest oxygen reading since the instrument was switched on Press the main button to clear the peak readings to current levels 5 2 Zeroing instrument in clean air Press the lower 5 key until the bar on the LCD moves from RUN to ZERO Press the main button to accept The instrument will zero its gas readings The instrument must be in fresh air before performing this operation If a key symbol appears on the LCD a password is required to zero the instrument see section 5 5 If E2 appears section 10 the zero offset is too great to be adjusted such as would occur with an oxygen channel in air In this case the channel should be calibrated to read 20 9 section 5 3 5 3 Calibrating instrument Ensure the instrument reads zero except oxygen in fresh air Fit the flow adaptor as described in section 6 From RUN mode press the 5 key to progress the bar on the LCD to the CAL position Press the key to select the gas channel to be calibrated Pass calibration gas through the flow adaptor as described in section 6 3 Press the Ch or keys to adjust the reading to match the known gas concentration Pressing either cursor key at this stage will result in the adjustment being scrapped Press the main button to accept the new value A key symbol may appear indicating that this value cannot be changed without a password If so enter the password as descri2. button the display is cleared and the key symbol appears fig 5 4 to prompt the user to key in the relevant password Enter the correct sequence of the S G keys As each key is pressed a small o appears fig 5 5 After four key entries press the main button The selected function will operate if the correct password was entered otherwise a question mark appears fig 5 6 Acknowledge the error by pressing the main button CH4 H2S CO O2 PEAK CH4 H2S Co O2 PEAK LEL PPM PPM HOLD LEL PPM PPM HOLD a 3 4 mO ot O RUN ZERO CAL SET SET RUN ZERO CAL SET SET LO HI LO HI fig 5 3 fig 5 4 CH4 H2S CO O2 PEAK CH4 H2S CO O2 PEAK LEL PPM PPM HOLD LEL PPM PPM HOLD a gt 3 rO rO 3 D RUN ZERO CAL SET SET RUN ZERO CAL SET SET LO HI LO HI fig 5 5 fig 5 6 Once a password has been successfully entered it remains valid until the instrument is returned to Run mode All functions protected by this password now take immediate effect when they are selected 6 Remote Sampling amp Calibrating It is often desirable to take samples from a remote location such as when testing a confined space before entering Also it is necessary to sample a source of known gas for calibration purposes Two Flow Adaptors are available which attach over the sensor grille to allow the internal pump or a hand held aspirator bulb to be used to draw remote air samp
3. can be recharged on their own without being connected to the main instrument No damage will occur if dry cell packs 7 3 are inadvertently placed in the charger as no charging current will flow 7 3 Dry cell packs non rechargeable Dry cells come in a distinctly marked battery pack to avoid confusion To change batteries detach the battery pack from the instrument Using the Allen key provided remove the bolts securing the battery retaining plate Replace the spent cells taking note of polarity indications Cells may only be replaced in a safe area Use only the following battery types Duracell MN1500 LR6 Ever Ready Energizer LR6BA Varta 4006 The use of alternative types will invalidate intrinsic safety approvals 8 Sensor Replacement 2 yx 2Srrirri hex screws f f k Battle Trenera ar K ate 5 x pozidrive Screws Sensor mounting PCB Header for sensor 3 Headers resistors 6 header PCE Header for sensor 2 are on far side of Remove the flow adaptor if fitted section 6 Remove the baffle plate which is secured by two screws The removable filter may come away with this component Remove the five screws securing the sensor plate assembly and withdraw it from the instrument fig 8 1 Rotate the quick release fixings which retain the sensor mounting pcb and detach it from the sensor plate Individual plug in sensors may now be replaced as required If replacing a toxic se
4. first indicated by the upper cursor showing 18 7 LEL CH4 methane present After a few seconds the cursor moves to the next position and H2S hydrogen sulphide ppm parts per million is displayed A few seconds later it switches to sensor 3 which reads ppm CO carbon monoxide then to sensor 4 which displays by volume oxygen After completing this cycle it returns to sensor 1 and repeats 3 3 Display Symbol Guide Battery Low Accompanied by faster confidence bleeps Indicates that there is less than 20 minutes battery life remaining If switched off the instrument will not allow itself to be switched on again in this condition B Pump blocked Accompanied by a ticking noise Indicates that the built in pump or airway is blocked Check that the flow adaptor and sample lines are free from water or dirt Also check the sensor filter behind the baffle plate fig 8 1 This can occur if a sampling pipe is lowered into a flooded cavity as the pipe may then suck up water It can also be triggered if the air intake is blocked with a finger clothing etc Once blocked the pump will not be restarted unless the flow adaptor is removed and re attached or the instrument is switched off and on again rO Password protection Indicates that the function being selected cannot be accessed without a password This may be encountered when attempting to Zero Calibrate Set Alarm levels or turn the instrument off Password entry is described
5. in section 5 5 ah Peak hold Indicates that the reading displayed is the highest level recorded since the instrument was switched on or reset For oxygen Peak Hold records the lowest value encountered Peak Hold works for all gases simultaneously Selection is described in section 5 1 C TWA alarm Sometimes appears during alarms section 4 4 Alarm types For each gas channel there are three instantaneous alarms level 1 2 and 3 For toxic gas channels there are also two time weighted average TWA alarms which operate at short term 15 minute and long term 8 hour exposure limits Level 1 and 2 instantaneous alarms referred to as LO and HI on the display label may have their thresholds adjusted from the instrument keypad section 5 4 All alarms may have their thresholds set via the computer interface section 14 4 and the following parameters may be set for instantaneous alarms Normally triggered on a rising level alarms may be set to trigger on a falling level as with oxygen deficiency alarms Alarms may be latching requiring manual reset or self clearing when the hazard has passed Normal alarms cannot be cleared whilst the gas hazard persists It is possible to set them so they may be silenced the red LEDs will continue to flash This allows the user to set a pre alarm warning at a low gas level and a non silenceable alarm at a higher level Unused alarms may be deactivated If any alarm even
6. the Adjust menu Connect a supply of calibration gas as described in section 6 3 Select the gas channel and type in the known value of the calibration gas Click OK when the instrument reading has stabilised 14 4 Configuration fig 14 2 Status Bar The Status Bar fig 14 2 indicates the relative state of three editions of the configuration file The FILE version is that stored on computer disk the EDIT version is that stored in computer RAM and the Custodian version is that stored in the instrument When the program is first started all three are portrayed in yellow indicating that no valid configuration exists Upload the configuration from the Datalink menu to load all instrument parameters into computer RAM EDIT and Custodian items on the Status Bar turn green Before editing this configuration it is wise to save the current one to disk from the Files menu select Save As and name the file anyname set The FILE item on the Status Bar turns green indicating that all three editions are now the same Set Parameters Display mode Alarm sound Fa E Twotone E Logging period Seconds Passwords J Zero J Zero C Calibrate q Calibrate O Alarms J Alarms O oft O oft d Confidence Blip Next calibrate Weeks fig 14 3 This configuration may be viewed or edited by clicking on the Edit menu to bring up the Set Parameters dialog box fig 14 3 Within this box it is possible to alter the following param
7. 14 SetCustodian Computer Interface 14 1 Introduction 14 2 Installation 14 3 Routine Functions 14 4 Configuration 14 5 Datalogging 15 Logmanager Program 15 1 Spreadsheet Files 2 Introduction to Custodian The Crowcon Custodian is a portable gas detector which can monitor up to four gases simultaneously It is designed to be carried or worn by individuals working in hazardous environments such as confined spaces and will give a loud audible and bright visual alarm warning when preset concentrations of gas are detected Detailed mechanical design features have resulted in an easy to service instrument with sealing to IP65 The user interface has been designed to combine the best features of one button operation for routine applications with simple multi button operation for advanced functions The shape of the instrument has been designed to fit comfortably against the body and pose the least restriction on movement It can fit in a pocket on a belt or a chest harness The detachable battery pack can be replaced in a hazardous zone for round the clock operation Rechargeable packs utilise environmentally friendly nickel hydride batteries with a life of up to 1000 charge cycles These will power an instrument with one flammable sensor and three electrochemical sensors for 16 hours Dry cell disposable packs are also available The sensor module can be detached and replaced for easy field maintenance Unique to an instrument
8. Custodian Portable Gas Detector User s Manual Quick Operating Guide To switch instrument Press main button Intermittent on beep and green LED flash indicates unit operational i To reset accept alarms Press main button To switch on backlight Press any button To switch instrument Main button amp key off simultaneously To zero instrument in Press lower 5 key until bar on clean air LCD moves from RUN to ZERO then push main button to accept If a key symbol appears on the LCD a password is required to zero the instrument section 5 5 Alarm Fast flashing red LEDs and wailing sounder indicates gas hazard A finger guard is available which only permits access to the main button amp key This restricts access to instrument functions but does allow the unit to be switched on and off Issue 1 Contents 1 Quick Operating Guide 2 Introduction to Custodian 3 Operation 3 1 Switch on sequence 3 2 Runmode 3 3 Display Symbol Guide 4 Alarm Types 5 Keypad Functions 5 1 Peak Hold 5 2 Zeroing 5 3 Calibration 5 4 Altering alarm levels 5 5 Password Entry 6 Remote Sampling amp Calibrating 6 1 Pumped Instruments 6 2 Diffusion Instruments 6 3 Calibration Method 7 Battery Pack 7 1 Changing the battery pack 7 2 Recharging 7 3 Dry cells non rechargeable 8 Sensor Replacement 9 Fixing Attachments 10 Troubleshooting Guide 11 Limitations of Use 12 Accessories 13 Spares
9. a Exchange the battery pack instead Do not use a CommsPod in a hazardous area 12 Accessories Auto calibrator DCO 103 Charger DCO 105 CommsPod DCO 101 Rechargeable battery pack DCO 102 Dry cell battery pack DCO 114 Chest harness DCO 104 Carry case Pocket clip Belt bracket Carry strap DMO 421 Finger guard DCO 107 Flow adaptor pumped DCO 108 Flow adaptor diffusion Water float Aspirator Aspirator probe 13 Spares DMO 428 Goretex filter 5 pack DMO 420 Sensor blanking plug Electric pump DMO 403 Battery pack clip DEO 108 Switch membrane DEO 110 Flammable sensor DEO 111 Oxygen sensor DEO 112 Carbon monoxide sensor DEO 113 Hydrogen sulphide sensor DEO 114 Sulphur dioxide sensor DEO 115 Nitrogen dioxide sensor DEO 116 Chlorine sensor 14 SetCustodian Computer interface 14 1 Introduction SetCust is a Microsoft Windows based utility program for interfacing with a Custodian gas detector Using industry standard RS232 from the PC serial port the program allows full access to the instrument for routine operations such as calibrating and advanced funtions such as altering passwords Functions and configuration options are presented with Windows menus and dialog boxes 14 2 Installation The minimum hardware requirement for SetCustodian is a 386SX PC running Windows 3 0 or later To install SetCustodian on the hard disk insert the disk in drive a click on the File menu in Program Manager select Run and t
10. as may represent a toxic risk it is advisable to connect the outlet to an exhaust bag or fume extractor Typically calibration gas must be applied for 30 seconds or more before the reading stabilises to its final level This reading may then be adjusted to the desired level using the keypad section 5 3 or computer interface section 14 3 An automatic calibrator is available to streamline batch calibration 7 Battery pack 7 1 Changing the battery pack Oye 1 Prise the clips away from the bottom of the battery pack 2 Push the clips up towards the instrument to detach the hooks and release them from the main body 3 Pull the battery pack away from the instrument Refit a charged pack by reversing the above procedure A CommsPod may be fitted in the same way Battery packs may be replaced in a hazardous area but CommsPods may only be fitted and used in a safe area 7 2 Recharging Do not use the charger in a hazardous area Switch the charger on Place the instrument in the charger with the charging contacts towards the rear The red LED will light whilst the instrument is undergoing fast charge Full recharge from flat takes about 6 hours during which it is normal for the batteries to become warm After fast charging the red LED goes out and the green LED comes back on the batteries are now charged and receiving a trickle current The instrument can be used immediately or left on charge indefinitely Battery packs
11. bed in section 5 5 If E3 appears section 10 and the display does not achieve the desired value the gain is being set out of range indicating probable sensor failure or incorrect calibration gas Press the eS key to select another channel for calibration or the 5 key to step via the alarm view change options back to Run mode 5 4 Viewing Altering Alarm levels Press the 5 key until the SET LO function is indicated Press the key to select the channel The low alarm level for that channel is now displayed and may be adjusted with the keys Pressing either cursor key 5 at this stage will result in the adjustment being scrapped Press the main button to accept the adjustment A key symbol may appear indicating that this value cannot be changed without a password If so enter the password as described in section 5 5 Press the key to select another channel or the key to step via the SET HI option back to Run mode The SET HI funtion is identical in operation to the SET LO function exept that it operates on the level 2 alarm 5 5 Password Entry Access to the functions zero calibrate set lo and set hi may be restricted by the assignment of two passwords within the SetCustodian configuration program section 14 4 The default configuration is as follows Password 1 D S ZERO Password 2 ZERO CAL SET LO SET HI OFF If a protected function eg zero fig 5 3 is selected with the main
12. e indicating probable sensor failure or incorrect calibration gas The gas reading is set as close to the desired level as the gain limiting software will allow E4 Sensor Overrange displayed in place of a legal sensor reading E5 High low Temperature gas readings may not be reliable at these extremes E6 Electronic Hardware Failure the instrument should be sent for repair Most of these warning codes can be acknowledged cleared by pressing the main button 11 Limitations of Use Gas readings may not be reliable at temperatures above 50C or below 20C In this case the E5 error message is displayed Flammable gas sensors will respond to many flammable gases and vapours although the calibration will be specific to one type Readings may be reduced if the atmosphere is oxygen deficient Substances containing lead silicones or halogens may permanently reduce the sensitivity of flammable gas detectors Toxic gas sensors may respond in varying degrees to gases for which the sensor is not calibrated Cross sensitivity data is available from Crowcon s Sales Department Reactive gases such as chlorine are adsorbed onto the surfaces of most materials including sensor apertures and sampling equipment This will delay the response to the gas Use inert tubing such as PTFE and keep sample lines short If hand aspirating ensure that the minimum flowrate of 1I min is maintained Do not replace disposable cells in a hazardous are
13. eters Display mode full or blank display Alarm sound a menu of alarm tones is available for the instrument s gas alarm Click Test for a preview of the sound Logging period see Datalogging Functions timeout if this option is selected instrument keypad functions zero cal set lo set hi will be disabled 30 seconds after switch on Confidence blip on or off shown on Next calibrate this option defines the period between a full instrument calibration and generation of the E1 section 10 Calibration Expired warning Passwords two passwords are assigned for the restriction of user access to instrument keypad functions The default password protection shown in fig 14 3 indicates that no password is required to turn the instrument off password 2 must be entered in order to calibrate or change alarm levels either password 1 or 2 must be entered in order to zero the instrument Click the check boxes if it is required to change this pattern of protection Click the Password 1 or Password 2 button if it is required to change either key sequence The Set Password dialog box appears fig 14 4 Press left four keys in sequence to set the password Cancel will retain the current password Password level 1 fig 14 4 Setup channels Click the Channels button to bring up the Setup channels dialog box fig 14 5 Setup Channels Editing Channel Number 2 Range Gas Time Weighted Averages Sho
14. les The adaptor is secured with two finger screws 6 1 Pumped Instruments fig 6 1 The internal pump switches on automatically when the Pump Flow Adaptor is fitted over the grille Air is drawn in through the nozzle on the adaptor and exhausted through the small nozzle below the sensor grille In this configuration the instrument continuously samples air in its immediate vicinity A sample tube may be connected to the inlet nozzle for remote sampling Warning the instrument senses the presence of the flow adaptor using a magnet moulded into the adaptor Keep the flow adaptor away from cassette tapes floppy disks etc 6 2 Diffusion Instruments fig 6 2 The Calibration Flow Adaptor has an inlet and outlet nozzle marked by air flow direction arrows Inlet connections are as for pumped instruments but the outlet must be connected to a hand aspirator bulb or other suitable pumping device A consistent style must be adopted when using hand aspirators Crowcon recommend squeezing once per second to achieve a flowrate of approximately 0 5 1 litre min This adaptor may also be used on pumped instruments in which case the internal pump will not run 6 3 Calibration Method Pass calibration gas through the flow adaptor from a regulated cylinder Use a flowmeter and needle valve set after the regulator to set a flow rate of 0 5 1 litre min Pumped units should ideally be fed gas from an unpressurised gas bag When the calibration g
15. ment select Upload Log from the Datalink menu Save file as anyname log See LogManager section for analysis of log files After uploading select Clear Log from the Adjust menu to make room for new reports in the instrument Set the Logging period in seconds by entering a value in the Set Parameters dialog box from the Edit menu The default value is 60 seconds 15 LogManager Program Once a logged data file has been saved on disk it may be analysed using LogManager Launch the program by double clicking on the LogManager icon LogM anager Select Open Log from the File menu Select the file of interest anyname log by typing the filename or clicking on a name from the list Click OK Data is presented graphically with an individual coloured trace for each gas As the mouse pointer is moved around the screen the gas level and event time are displayed in the upper left corner Use the horizontal scroll bar to move along the time axis Gas values are scaled according to the maximum range on any channel shown In order to see detail on a low range channel eg 25ppm H2S it may be advantageous to turn off the traces of any high range channels eg 500ppm CO This is achieved by selecting the View menu and clicking on channels to turn traces on or off A tabular listing of the current log file is available by selecting Print from the File menu The listing is directed to the resident printer 15 1 Spreadsheet Files For de
16. nsor it is necessary to replace the associated header pcb This is supplied with the spare sensor and should be fitted to the socket on the marshalling pcb nearest to the sensor in question When reassembling ensure that all gaskets and filters are in good condition and correctly fitted 9 Fixing Attachments A number of options are available when it comes to wearing or carrying the instrument The standard attachment is the transparent belt bracket fitted to the rear of the instrument through which a normal trouser belt may be fed In place of the belt bracket the chest harness bracket may be attached The chest harness is worn as shown in figure 9 1 fig 9 1 Chest Harness A pocket clip is available for the front of the instrument which enables it to be worn as shown in figure 9 2 The battery pack fits inside the pocket so that the sensors face outwards fig 9 2 Pocket Clip 10 Troubleshooting guide Symptom Remedy check replace batte required bleep gas present clean air inaccurate reading replace sensor PC unpowered section 14 4 The instrument may display the following warning codes E1 Calibration Expired indicates that the period between regular calibrations has elapsed E2 Zero Failed results from attempting to zero a channel exposed to gas including an oxygen channel in air The function request is aborted without effect E3 Calibration Failed the gain is being set out of rang
17. of its size there is an optional integral pump for remote sampling or forced diffusion 3 Operation 3 1 Switch on Sequence To switch on the instrument press the main button The instrument tests all LCD segments red alarm LEDs and sounder before entering Run mode The green confidence LED will flash and the speaker bleeps every few seconds to reassure users that the instrument is working and the environment is safe It is now ready to be used Note the audible bleep may be turned off using the SetCustodian program section 14 4 What if the display shows a message like E1 E numbers indicate that the diagnostic routines have found an error such as Calibration Expired Section 10 gives further details 3 2 Run Mode The instrument displays each gas reading in turn for several seconds cycling back to the first The channel displayed is indicated by a bar on the LCD under the gas name on the label To hold on a particular channel press the upper key to select the channel of interest Note that the Run indication disappears Press the lower 5 key to return to Run mode The display may be blanked by a selection in the SetCustodian configuration program section 14 4 CH4 H2S CO 0O02 PEAK LEL PPM PPM HOLD gt Gp b m 9 a RUN ZERO CAL SET SET LO HI fig 3 1 The display panel shown in figure 3 1 is for an instrument with 4 sensors fitted The sensor 1 reading is displayed
18. rt term level 15 0 Long term level Alarm 1 Alarm 2 Alarm 3 J Active J Active O Active d Rising Alarm d Rising Alarm C Rising Alarm C Latching gt Latching C Latching gt Can Mute O Can Mute O Can Mute Value Value Value fig 14 5 Channel 2 setup is shown click Next or Previous for other channels Gas type Range and Units are selected from pull down menus Time Weighted Average TWA alarm levels for Short term 15 minutes and Long term 8 hour may be edited These values only apply to toxic gas channels Three instantaneous alarms are configured as shown fig 14 5 Alarm 1 is anon Latching alarm triggered by the gas level Rising above 5 ppm which may be silenced Alarm 2 is a Latching alarm triggered by the gas level Rising above 10 ppm which may not be silenced Alarm 3 is not Active Click Finished to close the Setup Channels box and again to close the Set Parameters box If any changes have been made to the configuration the FILE and Custodian items on the Status Bar turn red indicating that they are now different to the current RAM edits To download the new configuration to the instrument select Download from the Datalink menu Custodian item on Status Bar turns green Saving the configuration to disk as newname set will turn the FILE item green also A printout of the configuration is available by selecting Print from the Files menu 14 5 Datalogging To access logged data from an instru
19. t is triggered the red LEDs will flash and the sounder will emit a loud tone This tone is selected from a menu available to the SetCustodian user section 14 4 The gas channel which has detected an alarm condition will be indicated by a flashing LCD bar below the gas name The gas value of a channel in alarm will flash whilst it is being displayed If the TWA Time Weighted Average symbol appears on the display this indicates that the total cumulative exposure to a toxic gas has been reached for an 8 hour shift or a 15 minute window Health amp Safety regulations require that workers should leave the hazardous area once they have exceeded this dose A TWA alarm cannot be manually reset The main button may be used to silence or clear certain instantaneous alarms as the configuration permits 5 Keypad Functions 5 1 Peak Hold CH4 H2S CO O02 PEAK CH4 H2S CO O2 PEAK LEL PPM PPM HOLD LEL PPM PPM HOLD gt aD gt ap BI 183 l C o D o l RUN ZERO CAL SET SET RUN ZERO CAL SET SET LO HI LO HI fig 5 1 fig 5 2 Peak Hold mode can be selected from Run mode by pressing the upper button until the bar appears under the PEAK HOLD label legend fig 5 1 Press the main button to make the double peak symbol appear fig 5 2 Pressing the main button again at this stage restores normal display and removes the symbol Return to Run mode or a specific channel with the cursor keys G
20. tailed analysis and presentation of logged data files should be converted to comma separated variable c s v format and then imported into a proprietary spreadsheet program eg Microsoft Excel Lotus 123 Select Save as from the File menu and save the current logged data as anyname csv By default this selection converts the entire file to csv format In some countries spreadsheets have been standardised to use semi colon delimited data files In this case select the Convert menu and click the semi colon data separator check box before saving the file This dialog box also enables a user to convert just a part of the data file by entering the start and end reading numbers By default the complete file is selected
21. ype a setup as the Command Line Setup will create a directory and program group called Custodian fig 14 1 a Custodian NA a SetCustodian LogM anager ReadMe Txt fig 14 1 By default SetCustodian uses serial port COM1 If using port COM2 the win ini file may be edited with Notepad such that the lines CUSTODIAN PORT 2 are included Be sure to create a backup of win ini before editing it To run SetCustodian Run Windows Double click on the SetCustodian icon which can be found in the Custodian program group fig 14 1 Ensure that the instrument is fitted with a CommsPod in place of the battery pack see section 7 1 on battery pack removal The CommsPod must be powered from a 12V supply such as the Custodian charger and the serial lead must be plugged in to the computer serial port The intrinsic safety certification does not permit this operation in a hazardous area Switch on the instrument 14 3 Routine Functions Select Upload from the Datalink menu this reads the configuration from the instrument which is necessary to identify various parameters such as gas types A table appears on the screen Select Read Gas from the Datalink menu current gas values are inserted into the table To zero the instrument select Zero from the Adjust menu there is the option to zero one or all channels simultaneously Ensure the instrument is in fresh air To calibrate the instrument select Calibrate from
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