Detective+ User Manual
Contents
1. 6 6 mp E X ee 7 3 3 E 8 B24 CAUTIONS sace e mier P Pee ee Ee tr e Pe 9 3 5 Backligltz i titt RE ERN RR RT eret 9 336 AIaEIms odi eb eiat etate HER totas cet 9 3 7 Status Screens Alarm Reset 9 3 8 Switchihg Of e t e RH 10 IMs Setting 11 4 1 Using the Menu system 11 A 2 Config ration ODptions o tete nat Maie 14 43 etti ACE B age Sede ted Les det casts 18 4 4 Pellistor ig rtt testet tr i eti m te e s 19 RN Battery E 20 assess orth et 22 VII Interconnection Between 5 23 VIII Troubleshooting mato etm temps 24 IX Maintenance and 25 9 1 Recalibratind reete rh e tet tee vetu ieu 25 9 2 Replacing the Battery Pack 25 9 3 Replacing a Sensor Module 26 9 4 User Replaceable 5 e 27 X PC interface and software ase He desea iav eae inda 28 XI Limitations OT2. Continuous 2400 Hz Slow Whoop 500 1200 Hz 0 3 Hz with 0 5 s Continuous 660 Hz gap repeated Sweeping 2400 2900Hz 162 Continuous 2400 Hz Alternating 2400 2900 Hz 2 Hz Continuous 2400 Hz Continuous 800 Hz 0 25 s Intervals Alternating 800 1000 Hz CROWCON 39 Gas Detection You Can Trust Appendix 6 Alarm Tone Setting on the IS mA3 Sounder Detective Dip Switch Setting Alarm Tone Low Battery Tone Sweeping 500 1000 Hz 1 Hz Continuous 2400 Hz Continuous 800 Hz Continuous 2400 Hz Sweeping 500 1000 Hz 1 Hz Continuous 2400 Hz Intermittent 660 Hz 1 85 1 8 5 OFF Continuous 2400 HZ Alternating 800 1000 Hz 0 25 intervals Continuous 554 HZ Sweeping 800 1000 Hz 7 Hz Continuous 2400 Hz Alternating 800 1000 Hz 0 25 5 Intervals Continuous 800 Hz Simulated Bell Continuous 2400 Hz Simulated Bell Continuous 800 Hz Intermittent 1000 Hz 15 ON 15 Continuous 2000 Hz 40 gt CROWCON Gas Detection You Can Trust Detective Dip Switch Setting Appendix 6 Alarm Tone Setting on the IS mA3 Sounder Alarm Tone 420 Hz 0
3. siete etin etse dum it eed 29 SOC I CAEN cesare feni eO RUN 30 XIII Accessories po e b RR 31 Appendix 1 Pumped version 33 Appendix 2 Default Flammable Correction Factors 34 Appendix 3 Front Panel Text Items 35 Appendix 4 Sensor 37 Appendix 5 Menu 38 Appendix 6 Alarm Tone Setting on the IS mA3 Sounder 39 Detective Quickstart Guide Quickstart Guide Overview Alarm LED Power On LED Operator screen UNMARKED button use this button to silence sounder reset alarm and select options from the Menu Switch off CAL button BACKLIGHT press the ON button use this button to button and UNMARKED perform calibration button together to and access unit s switch off configuration Turn ON Press ON press the UNMARKED button to reset alarm green LED flashes and display will show gas levels or display MONITORING if the instrument is in the GO NO GO mode see SETTING UP In Alarm condition Alarm sounds and the red LEDs flash Press the UNMARKED button to silence the sounder the red LED will continue to flash if gas is present Gas display mode ALARM flashes next to the hazardous gas name GO NO GO mode display reads GAS HAZARD EV
4. 625 5 Australian Alert Low Battery Tone Continuous 2400 Hz Sawtooth 1200 500 Hz 1 Hz D I N Intermittent 1000 Hz 15 ON 1 s OFF Alternating 1000 2000 Hz 0 5 s Singapore Intermittent 1000 Hz 15 ON 1 s OFF Intermittent 800 Hz 0 2 Hz Alternating 554 Hz 100 mS 440 Hz 400 mS NFS 32 001 Sweeping 600 Hz 1200 Hz 1 Hz Continuous 2000 Hz Continuous 554 Hz Alternating 1000 2000 Hz 0 5 s Singapore Intermittent 1000 Hz 15 ON 1 s OFF PFEER General Alarm Continuous 1000 Hz Sawtooth 1200 500 Hz Q 1 Hz D I N Continuous 1000 Hz 500 1200 Hz 3 75 5 0 25 5 Australian Continuous 2400 Hz gt CROWCON Gas Detection You Can Trust Simulated Bell Continuous 1000 Hz 41 GROUP COMPANY Kebon P RODUC T Thank you for reading this data sheet For pricing or for further information please contact us at our UK Office using the details below UK Office Keison Products P O Box 2124 Chelmsford Essex CM1 3UP England Tel 44 0 1245 600560 Fax 44 0 1245 808399 Email sales keison co uk Please note Product designs and specifications are subject to change without notice The user is responsible for determining the sui
5. IN A HAZARDOUS 4 ine 35020 Static Hazard clean only with a damp cloth Refer to manual for approved Battery types Do not use in atmospheres containing greater than 21 oxygen Zone 2 An area classified as Zone 2 is not likely to have ignitable concentrations of flammable gases vapours or liquids present under nor mal operating conditions mm 2 The equipment is Category 2G and may be used zones 1 and 2 with flammable gases and vapours with apparatus groups IIB amp and with tem perature classes 2 T4 3 equipment is only certified for usen ambient Copyright Crowcon Detection Instruments Ltd 2007 temperatures in the range 20 C to 50 C and All rights are reserved No part of the document may be should not be used outside this range photocopied reproduced or translated to another language 4 Use only battery pack supplied by Crowcon without the prior written consent of Crowcon Detection Instruments Ltd Charging is only permitted in the non hazardous Publication number M07664 area DO NOT CHARGE IN HAZARDOUS AREA Third edition September 2007 5 The equipment has not been assessed as a safety related device as referred to by Directive 94 9 EC Annex II clause 1 5 Contents Quickstart As tuu qa tacit 1 General Description aod teris 3 NU 6 dio 4 Ill ODE
6. and then the calibration will be performed If the instrument per ceives that the gas level is not steady then the message Gas not stable will be displayed and the calibration aborted 18 CROWCON Gas Detection You Can Trust Detective Pellistor saving If all channels are successfully calibrated the instrument will display the message Calibration successful otherwise the message Calibration failed with the list of gases that failed the calibration displayed When performing a calibration with a gas from a pressurised source the instrument s pump if present should always be turned off 4 4 Pellistor Saving To avoid the flammable sensor being damaged by exposure to excessive levels of flammable gas it is protected automatically Pellistor saving may be triggered in two ways On dual range flammable instruments i e those with a pellistor sensor measuring LEL and a thermal conductivity block measuring volume a percentage volume of gas may be specified at which the pellistor will be switched off This percentage is configurable by computer using the SetPortable software and is 5 by default Additionally a flammable sensor will switch itself off if it reaches a reading of 105 LEL or more this action will happen irrespective of whether a volume sensor is also fit ted If a flammable sensor switches itself off then it will stay off until it is manu ally switched on This happens by pressing the UN
7. local mains supply ensure that a suitably trained person fits the appropriate mains plug to the lead making sure to comply with all relevant local wiring and health and safety regulations To begin charging in a safe area loosen the grub screw on the charging socket cover and remove the cover Attach the supplied charging lead to the socket ensuring that it is firmly secure Plug the other end of the lead to the local sup 20 CROWCON Gas Detection You Can Trust Detective Battery charging ply and switch on Initially the red LED will illuminate indicating that the unit is Fast charging the battery When the battery reaches about 90 charged the unit will switch to Slow charging and illuminate the green LED If the battery is already charged before the power is switched on the unit will go straight to its Slow charge mode and illuminate the green LED immediately The Slow charging mode can be used to maintain a charge on the unit when it is not being used Before use when charging is complete the charging socket cover must be replaced and secured by tightening the grub screw provided The time taken to charge the battery will depend upon the state of discharge of the cell and its capacity Generally speaking it should take less than 8 hours to fully charge a standard 7 2 Ahr battery but if fitted with higher capacity cells the charging will take proportionally longer It is recommended that whe
8. set by the log period which is configurable via Portables PC software The standard logging interval is 1 minute For each channel the maximum level minimum in the case of oxygen is recorded since the last reading was taken and stored in the log Thus even if the log period is set to 10 minutes for example and a brief gas hazard occurs it will not be missed by the logger Logged data is retained in battery backed memory when the instrument is turned off When the memory is filled the new data over writes the oldest A log is extracted from the instrument and saved as a file on the computer via the Portables PC software which also allows viewing of the logged data on the PC The instrument notes the following events in the log along with a note of the channel the event is associated with if appropriate Log switched on either from front panel or by event trigger Log switch off either front panel or by instrument switch off Sensor channel overrange Instantaneous alarm 1 Instantaneous alarm 2 Instantaneous alarm 3 Short term exposure alarm Long term exposure alarm User triggered event from the instrument front panel Change of user from the front panel Change of site from the front panel The instrument is capable of storing just over 6300 data logs for all channels Events take the space of 2 logs 22 CROWCON Gas Detection You Can Trust Detective Interconnection Between Devices Vil Interconnection
9. 4 uonnq Jo uonounj 10 juo 10 pue uonounj 102125 1215 129 95 YML 1921109 129 95 dois 11 LYVLS NAV 1V AV IdSIQ g8rTVO 5 Appendix 5 4asn pue ays 4015 1215 109125 901 she 225 G utum paomssed MNJ 38 Detective Appendix 6 Alarm Tone Setting on the IS mA3 Sounder Appendix 6 Alarm Tone Setting on the IS mA3 Sounder When fitted with the red IS mA3 sounder the tone of the audible alarm on the Detective can be selected by means of a DIP switch within the sounder The default tone selected during manufacture is an alternating 2400 2900 Hz signal with a period of 2 Hz To gain access to the DIP switch loosen the single securing screw on the side of the sounder and twist the end of the sounder anticlockwise Be careful not to detach the connecting lead Select the required tone from the list below and set the DIP switch accordingly Replace the end of the sounder and tighten the securing screw Dip Switch Setting Alarm Tone Low Battery Tone Alternating 800 1000 Hz 0 25 s Intervals Continuous 2400 Hz Alternating 554 Hz 100 mS 440Hz 400 mS Continuous 2400 Hz NFS 32 001 Sweeping 2400 2900 Hz 7 Hz
10. 6 1 Remove the two security screws on top of the lamp cover on the top side of the unit and remove the lamp cover 2 Remove the centre fixing bolt exposed when the lamp cover is removed 3 Carefully remove the top half of the unit enclosure disconnecting the attached cable at the Main PCB 4 Remove the 5 pin molex JP3 labelled BATT connecting the battery to the main board Identify the sensor module to be replaced and disconnect the flexible pcb from it by lifting the shroud from the header and gently pulling on the tail Remove the two Pozi drive screws and the old sensor module Remove the old gasket membrane assembly Fit the new components according to a reverse of the above ensuring that the shroud is pushed home over the header to grip the flexible pcb tail securely Replace the LED lead onto the main board connected JP5 9 Replace the battery lead onto the main board connector JP3 10 Refit the cable lead from the top half of the case to the Main PCB and carefully replace the top half of the case onto the lower half of the 5 wa 6 LH CROWCON Gas Detection You Can Trust Detective User Replaceable Fuses case Ensure that the integrity of the edge seal is maintained 11 Replace the centre fixing bolt on top of the unit replace and secure the lamp cover Detective sensor modules are supplied precalibrated from the Crowcon factory and will identify themselves to the instrument when it
11. ACUATE AREA Instantaneous and TWA alarms Alarm is triggered when the instanta neous threshold is reached Press the UNMARKED button to silence the sounder the red LEDs will continue to flash if gas is present The sounder will be triggered again if a new alarm threshold is reached Reset Alarm Press the UNMARKED button CROWCON 1 Gas Detection You Can Trust Quickstart Guide Detective Turn On Backlight Press the BACKLIGHT button 69 It stays on for 30 minutes unless the button is pressed again This is programmable but is 30 minutes by default Battery Low Green LED flashes quickly the sounder frequency increases and a warning is flashed on the display Use charger lead to charge the unit 8 hours for a full charge Warning Charge the unit in a Safe area only Calibration Setting up Pressing CAL and entering a password enables the instrument to be recali brated and to change its operating modes and configuration gt CROWCON Gas Detection You Can Trust N Detective General Description General Description The Crowcon Detective is a microprocessor controlled transportable gas detec tor which is capable of monitoring up to four gas types simultaneously and pro viding warning of hazardous levels Using electrochemical catalytic and thermal conductivity sensors the instrument may be configured to detect any practical combination of oxygen toxic and flammable gas See Appendix 4 for no
12. Approvals Europe USA Canada Standards Europe 30 Rigid frame 640 h x 482 w x 457 d mm 25 2 x 19 x 18 inches Folding frame 640 h x 453 w x 454 d mm 25 2 x 17 8 x 18 inches 8 kg 17 6 165 65 20 C to 50 C 4 F to 122 F 0 95 RH non condensing 2 lines of 24 characters dot matrix high contrast LCD 6 V 7 2 Ah Sealed lead acid battery pack Built in battery charging circuit dual rate Input 100 or 250 V AC Safe Area operation only Typical charge time 8 hours Methane 20 s Oxygen 10 s Typical toxic gas 20 s Intrinsically Safe Essential Health and Safety Requirement clause 15 9 Sira 2102 2G EEx ibd IIC IECEx pending UL 913 pending CSA C22 2 pending EN50014 EN50020 EN61010 1 gt CROWCON Gas Detection You Can Trust Detective Accessories and spares XIII Accessories and spares Accessories list Description Aspirator assembly and lead Extra Aspirator Hose Sewermans Baffle Plate Computer Interface Lead Portables PC Interface Software Water Trap Interconnection Cable 10 m 15m 20m 25m 30m 50 100 Crowcon part number C01685 M04032 C01325 E07394 C01832 C011033 E07397 1965 1 1302 1 637 2 1302 2 637 1 1420 1 Description Crowcon part number General Spares Main PCB Main PCB Chassis Display PCB and Loom Battery Pack 7 2 Ahr Case Upper Case Lower Case Top Retaining Bolt Keypa
13. Between Devices When multiple units are needed to secure a large area or perimeter around a work site the Detective units can be connected together to provide indication of hazardous gas level alarms on all units even when the detecting unit may be out of sight sound of some of the working party Two connector sockets are provided at the rear of each Detective unit to per mit this mode of operation Using only suitable Crowcon supplied cables con nect each Detective to its two neighbours in a Daisy Chain configuration WARNING ONLY OTHER APPROVED DETECTIVE UNITS MAY BE CONNECTED TO THESE SOCKETS INTRINSICALLY SAFE INRINSICALLY SAFE SOCKETS i CONNECTION When a unit in such a system detects a gas alarm it will initiate an alarm in all units The unit detecting the alarm will indicate the alarm in the normal man ner as described in the preceding sections The other units in the system will indicate an alarm with the beacon lights at the top of the unit flashing at a much slower rate This permits the user s to determine at which point the gas alarm is occurring Up to twelve Detective units can be connected in this manner with a maxi mum cable length of 100 m between adjacent units gt CROWCON 23 Gas Detection You Can Trust Troubleshooting Guide Detective Vill Troubleshooting Guide SYMPTOM Does not switch on DIAGNOSIS Battery flat REMEDY CHECK Recha
14. Detective 7664 gt CROWCON September 2007 Gas Detection You Can Trust Issue 3 Safety information WARNING Do not change the battery in an flammable atmosphere WARNING Substitution of components may impair intrinsic safety WARNING Read the instruction manual before use Instructions specific for use in hazardous areas 6 Repair of this equipment shall be carried out by The following instructions apply to equipment cov the manufacturer or in accordance with the ered by certificate number cable code of practice Sira 2 102 7 Use only the appropriate Crowcon supplied cables for connection to the sockets at the rear of the The following information covers all relevant points list instrument ed in clause 1 0 6 of the EHSR s of the ATEX directive 8 If the equipment is used in a manner other than 1 The certification marking is as follows that specified in this manual the protection pro vided by this equipment may be impaired Area Classifications DETECTIVE ITED KINGDOM OX14 1 X II2G EEx ib d IIC T4 Cert No Sira03ATEX2102 i Ce Zone 1 An area classified as Zone 1 is likely to have ignitable concentrations of flammable gases vapours or liquids present under normal oper ating conditions x db S X V PA INTERCONNECTING SOCKETS TO OTHER DETECTIVES ARE INTRINSICALLY SAFE DO NOT CHARGE
15. MARKED button The sensor will warm up for 5 seconds before the flammable channel will read Pellistor saving is indicated on the display by the gas level being blank for the flammable block CROWCON 19 Gas Detection You Can Trust Battery charging Detective V Battery Charging The built in Sealed Lead Acid battery pack has sufficient capacity to power the instrument for over 36 hours including a 30 minute period in the Alarm condi tion The unit incorporates a two stage charging circuit that is powered from the local main supply using the appropriate Crowcon charging lead that is sup plied with the instrument The charging input socket is located at the rear of the unit and is protected by FAST a steel cover which is held in place by a retaining grub screw CHARGING SOCKET COMPUTER INTERFACE bd a NE WP 0175 73 C CO UTER INTER UNDER NO CIRCUMSTANCES MUST THE COVER BE REMOVED OR THE CHARGING LEAD BE CONNECTED TO THE UNIT WHEN IT IS LOCATED IN A HAZARDOUS AREA Depending on the factory setting the Detective charger input rating which will be either 250 V AC 150 mA 50 60 Hz or 110 V AC 300 mA 50 60 Hz This is indicated on the yellow rating label situated immediately below the charging socket Before connecting the unit ensure that the locally available supply is suitable for the indicated rating If the supplied charging lead is not fitted with a plug to connect to the
16. This will a as gas reading screen Menu is scrolled The four buttons have above them a symbol or word these are the soft key functions currently assigned to that particular key Use the ON and BACKLIGHT buttons to scroll left and right the CAL button to quit the menu system and the UNMARKED button to select a menu option View the road map on page 37 for details of Detective configuartion menu system The options available are MENU This selects the configuration menu It is password protected and described below EVENT This marks an event in the data log There is no menu beneath this option LOG This selects the log menu described below gt CROWCON 11 Gas Detection You Can Trust Setting Up Detective How to enter the configuration Menu Use the scroll buttons to select the MENU item and press the UNMARKED button The screen will display Password Press the buttons in the following sequence within 5 seconds to enter the default password ON BACKLIGHT CAL and UNMARKED This password can be changed via a PC and the SetPortable software 1 2 3 4 How to change an option To change an option use the first two keys labelled with the and sym bols to change the current selection and the third key labelled QUIT to finish changing the selection If the QUIT key is pressed and the parameter has been modified then the user is prompted with a save changes message Two keys are soft key function lab
17. an be activated to illuminate the display by pressing the BACKLIGHT button To switch off the backlight press the BACKLIGHT button again or it will turn off automatically after a configurable timeout period of 10 20 or 30 minutes Alternatively the back light may be configured to remain on permanently or to never timeout once Switched on See LIGHT in section 4 2 Configuration Options In an alarm condition the backlight is automatically turned on 3 6 Alarms When the Detective encounters an alarm condition the red lights flash the beacons activate and the sounder emits a loud fast bleep Where permitted instantaneous toxic gas alarms may be accepted by pressing the UNMARKED button In this case the sounder is silenced but the red lights continue to flash With instantaneous alarms the word ALARM will flash next to the gas name Time Weighted Average exposure limit alarms will flash the whole display with the warning All instantaneous alarm types are latching which means that they may only be reset by pressing the UNMARKED button when the gas hazard has passed If set up for time weighted average TWA alarms the Detective triggers non resettable alarm if a short term normally 15 minute or long term 8 hour exposure level is reached Both TWA alarm types may only be reset when the average exposure has fallen below threshold levels See Configuring the instrument with Portables PC software on setting these levels 3 7 Sta
18. an installed copy of the Crowcon Portables PC software version 1V1 5 or later The Computer Interface Lead Part Number E07394 and Portables PC Software Part Number 01832 are available from Crowcon or any of their approved agents For other available accessories refer to section XIII Attach the Interface lead to the Detective at the Computer Interface socket supplied at the rear of the unit Attach the other end of the Interface Lead to an available serial RS232 communications port on the PC With the Detective switched on open the Portables PC application and using either the Wizard or the Engineers Form select Detective and upload the configuration For more information on using the Crowcon Portables PC soft ware refer to the interactive help file installed with the software 28 CROWCON Gas Detection You Can Trust Detective Limitations of Use XI Limitations of Use LONG TERM STORAGE LIMITS OPERATING LIMITS gt CROWCON Gas Detection You Can Trust min max min max TEMPERATURE 0 C 20 C 10 C 50 C PRESSURE 900 mbar 1100 mbar 900 mbar 3 bar HUMIDITY 15 RH 90 RH O RH 90 RH non condensing 29 Specification Detective Specification Dimensions Weight Housing degree of protection Operating temperature Humidity Display Battery Battery charging Response time typical Explosion protection ATEX Safety certificate no
19. d Label Detective Keypad Label Detective IR Keypad Protective Film IS Sounder Lamp Cluster Lamp Connection Lead Lamp Cover Lamp Cover Retaining Bolts Charging Socket Charging Socket Cover Charging Socket Cover Gasket Charging Socket Grub Screw Charging Lead Interface Socket Interface Socket Cover gt CROWCON Gas Detection You Can Trust 501326 M01893 501345 5011951 M04905 M04906 M03723 E01940 E01924 M05478 E01956 E01955 E07324 M04907 M03336 E07391 M01540 M04383 M03334 E07390 E07392 M01543 31 Accessories spares 32 Detective Interface Socket Cover Gasket M04384 Retaining Strap for Socket Covers M04398 Retaining Strap Fastener M03405 Rigid Steel Tripod Variant Frame Leg Assembly 3 per set M01754 Frame Support Plate M01755 Frame Handle Assembly M01756 Fold away Composite Tripod Variant Leg Assembly S011970 Leg Hinge Bolt M03670 Frame Support Bracket M04901 Handle M01890 Handle Grip M04904 Top Retainer M04902 Top Retainer Fixing Screw M03801 Refer to the current price list for an up to date list of available spare parts including replace ment or alternative sensors and their relevant stock numbers gt CROWCON Gas Detection You Can Trust Detective Appendix 1 Pumped version optional Appendix 1 Pumped version optional The internal pump when used in conjunction with the external flow plate and sampling tube enables the Detective to mo
20. e DISPY functions Pressing the button when one of these options is selected will toggle the display mode between that set on the button and that set in the DISPY setting NORMAL serves a similar function If the DISPY mode has been set to some thing other than NORMAL then NORMAL allows the display mode to be tog gled from that set in the DISPY option to the normal gas display Note these display functions have no effect if the DISPY mode is set to OFF and that the instrument will always start up in the display mode set by the DISPY function If the MUTE function is enabled then a SILENT ALARMS option will also appear as one of the possible selections in the BUTTN menu This option allows the programmable button to toggle the MUTE feature between SILENT ALARMS and AUDIBLE ALARMS Note that when SILENT ALARMS is selected no audible siren will sound when the instrument is in alarm nor will the alarm light flash There will be a visual indication of the alarm condition on the instrument s display When the programmable button is pressed the instrument will issue a double bleep sound as an audible confirmation that a feature has been selected or de selected FLAMM This selects the flammable gas correction to be used for flammable pellistor sensors It may be set to NO CORRECTION or to one of the gases defined in the flammable correction table If a gas is selected then this will change the name on the display and use the selected correction fact
21. ead about the CALIBRATE option in SETTING UP CALIB and the CALIBRATE functions in Portables PC as either method may be used to adjust gain values but a knowledge of both is helpful First remove the pumped flow plate from the instrument if fitted Then zero the unit in clean air Place the calibration flow plate over the sensors and secure with the half turn fasteners Starting with flammable gases and moving on to toxic connect the appropriate cylinder of test gas to the inlet of the calibration flow plate The correct calibra tion flow rate is 0 5 litres per minute Most Crowcon gas bottles use a fixed flow rate regulator which automatically provides the correct flow rate Wait until the reading has stabilised on the Detective display before resetting the reading to the correct level Now shut off the valve and disconnect the sup ply of test gas Remove the calibration flow plate and allow the sensor to reset to zero 9 2 Replacing the Battery Pack The battery pack should only be replaced by a suitable trained and qualified Service Engineer Be careful to retain all nuts bolts and washers during disas sembly The procedure for replacing the battery pack is as follows 1 Remove the two security screws on top of the lamp cover on the top side of the unit and remove the lamp cover Remove the centre fixing bolt exposed when the lamp cover is removed Carefully remove the top half of the unit enclosure disconnecting the a
22. el configuration items accessible by pressing the CAL button Text Description MENU Enter configuration menu passworded LOG Enter data logging menu ZERO Zero all channels EVENT Mark event in the data log Only present at this level if so selected via SetPortable MENU level configuration items Text Description Options ALARM Select alarm mode INSTANT ALL ACTIVE TWA ONLY BUTTN Select programmable button function NOTHING NORMAL AVERAGE TWA TOXIC PEAK HOLD PUMP SILENT ALARMS CALIB Calibrate selected channel DISPY Select display mode NORMAL AVERAGE OFF TWA TOXIC PEAK HOLD FLAMM Select flammable correction factor NO CORRECTION LEVEL Allows setting of alarms LIGHT Select backlight timeout ALWAYS ON NO TIMEOUT 10 20 or 30 MINUTE TIMEOUT MUTE Select SILENT ALARMS or AUDIBLE ALARMS OFF Select instrument switch off mode OFF ENABLED OFF DISABLED PUMP Pump on or off GO STOP START Start up options NOTHING LOG ZERO ZERO amp LOG TIME Allows edit of instrument time hours and minutes ZERO Zero all channels Only if not selected to be at the higher level via SetPortable Only if MUTE function enabled via SetPortable gt CROWCON 35 Gas Detection You Can Trust Appendix Front Panel Text Items Detective LOG level configuration items Text Description Options START Start data logging STOP Stop data logging SITE Select site Site 1 Site 2 Or string pro
23. elled one with YES and one with NO Press the desired button For example to configure the start up option from the configuration Menu follow the steps below DISPY ALARM ZERO PUMP gt gt QUIT PUMP PjCROWCON D Scroll the menu list to the left until START is selected ALARM ZERO PUMP START lt lt gt gt QUIT START PjCROWCON Press the UNMARKED button to enter the START submenu 12 CROWCON Gas Detection You Can Trust Detective Setting Up START ZERO amp LOG lt lt gt gt QUIT CROWCON ecce Press the CAL button Use these buttons to scroll to select option and through options Section 4 2 QUIT menu Save the changes made YES NO CROWCON oeooe Press the first button to save the change and move the menu back up a level and the last key to leave the selection as it was unchanged and move back up a level The menu system has timeouts on all operations If no keys are pressed within about 20 seconds the system steps back one level at a time Changes that have been accepted by pressing YES to the save changes prompt are retained Any change that has not been explicitly saved will be lost The following parameters are modifiable via the instrument front panel but tons and are displayed on the screen in the following order ZERO FLAMM LEVEL PUMP CALIB DISPY ALARM START BUTTN TIME OFF LIGHT Details of each parameters are given in section 4 2 a r
24. er respond with CAL SUCCESSFUL or CAL FAILED If the calibration failed the instrument s gain is not changed and means that either the gas con centration was not equal to the value set check both and repeat or that the sensor has deteriorated with use see Maintenance and Calibration for sensor replacement When a calibration is being performed replace the integral flow plate with the calibration flow plate so the gas is not being sampled by the pump Note when calibrating flammable sensors they will always appear in the CALIB menu as the sensor type they really are without any flammable correction factor applied They should also be calibrated as per the gas they really are and not 16 CROWCON Gas Detection You Can Trust Detective Configuration options as per the gas selected as a flammable correction factor For example if there is CH4 methane sensor in an instrument and a flammable correction factor is applied so that the instrument reads PRO propane then the sensor would be selected as the CH4 and not PRO in the CALIB menu and methane used to calibrate the sensor TIME Selecting this will give a display of the form CURRENT TIME 21 48 00 HOUR MINUTE QUIT CROWCON Press the key labelled HOUR to increment the hours and the key labelled MINUTE to increment the minutes until the correct current time is displayed OFF Two options OFF ENABLED OFF DISABLED Determines whether the instru ment can be switc
25. es the gas concentration the units of measurement e g ppm and the channel name e g 25 Each sensor module contains analogue circuitry to support the sen sor and a small digital memory which identifies it to the processor along with calibration data and alarm thresholds A quarter of the screen is reserved for each of a possible 4 gas channels The normal mode of operation is continuous real time gas concentration H2S 0 0 ppm CO 0 0 ppm 0 0 LEL 02 20 9 96 jCROWCON Confidence signals The green power LED flashes intermittently to give confidence to the user that all is as it should be CROWCON 7 Gas Detection You Can Trust Operation Detective Display options The instrument may be configured into alternative display modes by the DISPY option see DISPY in section 4 2 Configuration Options The ON button can be programmed to switch between modes The possible display modes are Normal All gas values units and names are displayed in real time Average The average gas reading since the instrument was switched on is displayed for toxic sensors This is indicated by flashing avg with the sensor name Non toxic sensors will display their normal gas level Off Display reads MONITORING whilst a safe condition is perceived and flashes GAS HAZARD and EVACUATE AREA in alarm condi tion TWA Toxic This display mode only affects toxic sensors and is indicated by the letters TWA flashing
26. g is available The sealed lead acid battery pack within the unit provides for up to 36 hours of continuous operation including a 30 minute period in the alarm mode CROWCON 3 Gas Detection You Can Trust Unpacking Detective 1 Unpacking The Detective can be supplied with either a rigid steel tripod or a hinged com posite tripod designed to be folded away for storage When unpacking the steel framed Detective for the first time the three legs must be attached to the main body of the units frame using the bolts pro vided When unpacking the composite framed Detective for the first time the three legs will be in the folded position 4 gt CROWCON Gas Detection You Can Trust Detective Unpacking To unfold the legs a pull the leg upwards until it reaches its stop b rotate the leg downwards away from the instrument until it is pointing downwards c push the leg upwards until it firmly fits into position cbs If the legs are too loose are required to be permanently deployed gently tighten the fixing bolt at the leg hinge Similarly if the leg joint is too tight simply loosen the fix ing bolt at the leg hinge but dot not loosen it too far When packing the unit away simply reverse the above procedure When the legs are in the folded position the Detective is designed to be stacked one upon the other but it is recommended no more than three units at a time are s
27. ging the user is an event which is logged by the data logger SITE As user but site location 4 3 Quickcal The instrument has the ability to perform a quick calibration of four gas chan nels CH4 CO H2S and O2 in one go The system prompts the user through the procedure Before QuickCal is initiated the instrument should have been zeroed Now follow this procedure Press both of the middle 2 buttons and hold them down for 5 7 seconds The instrument will announce that the Quick Calibration has been initiated and remind the user that the instrument should have been zeroed before this procedure is invoked The instrument will now alternately flash the gas concentrations it is expecting to be applied and the prompt CALIBRATE ALL INPUTS with the two outer keys labelled with YES and NO Pressing YES moves on in the QuickCal sequence NO abandons the QuickCal and the instrument returns to the normal gas monitoring screen The instrument will now issue the prompt Is gas on sensors with the two outer keys labelled YES and NO as before Ensure the correct test gas is applied to the instrument and press YES Pressing NO returns the instrument to the normal gas monitoring display If YES is pressed the display will change to SENSORS SETTLING with a line of dots appearing on the bottom line of the display to indicate the instrument is working The instrument will now wait until there appears to be a good steady flow of gas
28. grammed via SetPortable USER Select user User 1 User 2 Or string programmed via SetPortable This option is only present if the logger is currently stopped This option is only present if the logger is currently on 36 gt CROWCON Gas Detection You Can Trust Detective Appendix 4 Sensor Limitations Appendix 4 Sensor Limitations Standard Detectivet units detect flammable gases using a catalytic flamma ble sensor which operates in the presence of oxygen It is advisable to check the oxygen concentration as well as the flammable gas concentration before entering a confined space Depleted Oxygen levels will reduce a flammable gas reading The performance of catalytic sensors may be permanently degraded if exposed to silicones sulphur containing gases such as 25 lead or chlorine com pounds including chlorinated hydrocarbons The instrument is not suitable for use in ambient temperatures above 50 C and electrochemical toxic gas sensors may be degraded at these temperatures Water should not be allowed to collect on the sensors as this may impede gas diffusion Use with care in wet or humid environments where water may con dense on the sensors and check response after use Persistent exposure to high levels of toxic gas can shorten the life of toxic sen sors Toxic sensors may also be cross sensitive to gases other than their specific target gas and hence the presence of other gases may cause the sens
29. hed off MUTE If the mute function is enabled which can only be done SetPortable see section IX PC interface and software then a MUTE option will appear within the menu system This option can be selected as either SILENT ALARMS or AUDIBLE ALARMS If SILENT ALARMS is selected then the word MUTED will flash on the main display with the gas units and name no audible alarm will sound when an alarm is triggered nor will the alarm LED will flash There will be a visual indication of the alarm condition on the instrument s display Note this option will be ignored when the instrument s display mode is selected as OFF LEVEL This option displays and allows modification of alarm 1 for flammable L E L channels Use the two keys labelled on the display as UP and DOWN to adjust this alarm level between to the required value Note Crowcon does not generally recommend that alarm levels be set to a level that is less than 596 of the sensor s range because of the possibility of spurious alarms being triggered CROWCON 17 Gas Detection You Can Trust Quick LOG MENU The LOG MENU acts similarly to the MENU system just described Options are START or STOP One of these two options is displayed depending on the cur rent state of the data logger Press START to turn data logging on and STOP to turn logging off USER Allows selection of a user name which is used in the data log see later The act of chan
30. is switched on It is advis able to check the response to test gas to ensure that no damage has occurred in transit and that installation has been carried out successfully 9 4 User Replaceable Fuses There are four fuses on the Main PCB within the Detective which can been replaced by the user if necessary Refer to figure below If so the fuses MUST be replaced by equivalent parts meeting the following specifications All of the fuses are Quick Blow Ceramic 20 m x 5 mm cartridge type fuses The ratings of the user replaceable fuses are F3 250 V AC 500 mA FA 250 2 F9 250 63 mA F8 250 V 63 mA CROWCON 27 Gas Detection You Can Trust PC interface and software Detective X PC interface and software The Detective can be connected to a PC using the serial communications link to configure calibrate and monitor the unit To do this the user will require the Computer Interface Lead and
31. n a unit has remained unused for some time weeks that it is charged before being used to ensure that a sufficient capacity is available The unit should never be left in a fully discharged state for any length of time more than a week as this will significantly impact on the life of the battery pack It is not necessary to wait until the Low Battery warning appears on the display to begin recharging the battery it is recommended that the unit is put on recharge immediately after any significant use to ensure the unit is ready for when it is next required If the operating life of the battery begins to reduce significantly or if the time taken to charge the battery begins to increase then it is recommended that the battery pack be replaced refer to your service support for details Refer to section IX for instructions on replacing the Battery pack Use only the Crowcon supplied parts see spares list when replacing the battery pack Note The user must comply with local environmental regulations when dispos ing of Detective battery packs CROWCON 21 Gas Detection You Can Trust Data Logging Detective Data Logging The data logging aspect of the instrument can be configured to be active when the instrument is switched on by the START menu option Additionally the instrument records events such as alarms and an event will cause the logger to be switched on Data is logged for all gas channels at a rate
32. nitor inaccessible atmospheres It offers a consistent flowrate and is not fatigued unlike the manual hand bulb Pumped units are fitted with a water trap which requires periodical inspection and emptying The pump mode may be defined within the calibration menu to be either pump GO or STOP This enables the instrument to be used in either pumped or diffu sion monitoring mode See the SETTING UP section above for details on how this can be configured Additionally it is possible to control the pump via the programmable button as described in section 4 2 Configuration Options If the STOP pump mode is selected the pump will not run and the flow plate and tubing must be removed to enable gas to enter the sensors by diffusion If the GO pump mode is selected the pump will now run and the flow plate should now be fitted Ensure that flexible tubing connects between the pump inlet nozzle on the side of the instrument and the outlet BULB side of the flow plate The sample tube should be connected to the INLET side of the flow plate The pump mode is remembered while the instrument is switched off On increasing the length of the sample tube the response time will be affected and some gases may be absorbed e g chlorine Add approximately 1 5 sec onds per metre of sample tube for gas to reach the instrument 4 mm tube Be careful not to suck water or dust into the instrument and avoid kinking the sample tube If the flow i
33. nside the next time it is turned on and zeroed it will zero in gas presence In this case after the gas is purged the detector will give negative readings If this happens purge the unit until it sta bilize at a negative reading then do a manual zero according to section 4 2 10 gt CROWCON Gas Detection You Can Trust Detective Setting Up IV Setting Up The Detective has been designed to display as much or as little information to the user as is required by the controller of the equipment On the one hand it is a four channel measuring instrument with continuous readout on the other a basic alarm only detector with status display and no way of switching it off This section describes how to tailor the instrument to the application via the front panel buttons The section on Configuring the instrument with Portables PC details other adjustments that may be made to the instrument configuration via a PC and the Portable PC software 4 1 Using the Menu system To access the SETUP menu press CAL button The screen will display the following As the menu is scrolled left or right the menu item here will appear as the soft key lt lt gt gt QUIT LOG option above the UNMARKED button MENU EVENT LOG Buttons act as soft key gt CROWCON 7 eed Scroll menu list a to the left currently indicated Scroll menu list Quit menu and y s Select Menu option to the right return to normal
34. oad map of the menu system can be found on page 36 CROWCON 13 Gas Detection You Can Trust Configuration options Detective 4 2 Configuration Options LIGHT Configures the backlight timeout option to be NEVER TIMEOUT 10 MINS 20 MINS 30 MINS or ALWAYS ON Whatever option is selected the backlight will always come on when the instrument is in alarm DISPY Display mode Configures the instrument display mode with one of the follow ing options Normal Average Off TWA Toxic Peak Hold These are described in the section IIl Operation Note the action of the BUTTN option below ALARM Alarm mode User can select one of the following ALL ACTIVE TWA ONLY INSTANT Within this option the instrument may be set up to acknowledge different toxic gas alarm types Instantaneous mode INSTANT sets the instrument to alarm as soon as threshold toxic gas level is reached TWA ONLY will cause the instrument to ignore temporary excursions above instantaneous alarm thresholds but to go into alarm instead when the SHORT TERM or LONG TERM exposure levels have been reached ALL ACTIVE enables both TWA and instantaneous alarm types but allows the user to silence instan taneous alarms see section Ill Operation ZERO When this option is selected the instrument will give the prompt ZERO ALL Only if you are sure that the instrument is in clean air and all sensors have settled down to a steady output should YES be pre
35. or for pellistor sensor gt CROWCON 15 Gas Detection You Can Trust Configuration options Detective modules It also applies the corrected gas values to the log file The exact list of gases and their corrections is configurable via a PC and the Portable PC soft ware The default of gas correction factors for flammable gases with respect to methane and pentane are listed in Appendix 2 CALIB This allows re calibration of the instrument which must first have been Zeroed in clean air You will need a calibration flow plate which is included as standard with the Detective and a supply of Crowcon calibration gas see section VIII Maintenance and Calibration The top line now displays one of the instru ment s gas channels This display will look like CALIBRATE CH4 Chan 1 lt lt gt gt QUIT CAL PjCROWCON Use the first two keys to select the required gas Press QUIT to move back up a menu level or CAL to select the gas to calibrate The display will now change to CALIBRATE 0 UP DOWN QUIT CAL CROWCON The actual gas reading is displayed on the top line and should go up when the relevant TEST GAS is aspirated over the sensors When the reading has stabi lised use the UP and DOWN keys to make the reading match the known test gas concentration Now press CAL to actually calibrate the instrument s gain QUIT can be pressed to abandon the calibration If the instrument is calibrated it will eith
36. or to respond If unsure contact Crowcon or your local agent Use of high power radio transmitters in close proximity to the instrument may exceed RFI immunity levels and cause erroneous indications If such problems are experienced remove antennae to a reasonable distance from the instru ment e g 30 cm CROWCON 37 Gas Detection You Can Trust Detective sujw sanoy 0 uey eiqesip ajqeua 440 uo og OZ OL se uondo 129195 6 02 195 Jauueys sjauueyo 2 asn 0832 sanjea YML sanjea yead y0o uo pue 0192 Nad ZH 101 HLA Lad EHN ILN INON 110 S40 98 5 IMNINV 14 ejqeuodies ui 105095 sey eJnjeeJ 104 129195 10 5 128195 TAA ALN yo Aejdsip youms 10 05 uo 31x0 129 Sso1d seb 1991109 0 shay moe pue seb Ajddy CROWCON Gas Detection You Can Trust Buryjou se Buryjou 40 senjeA YML 129 5591
37. rge battery Does not switch off OFF disabled Alter configuration No audible tick Tick disabled Alter configuration Alarm signals no gas Alarm latched Reset with UNMARKED button Flashing red alarm Sounder silent INST toxic alarm accepted Reset if possible check configuration Gas reading no gas Zero drifted Zero instrument Unstable inaccurate reading Sensor failed Recalibrate or replace sensor Loading Defaults mes sage on display screen Back up battery is dis charged Recharge unit then re configure and recali brate PC Interface Not Working Blown fuse incorrect software PC Portables version Check Fuses F8 and F9 see maintenance Section for details update to latest soft ware version Unit Not Charging Blown fuse dead bat tery incorrect input voltage Check Fuses F3 and FA see maintenance Section for details replace battery check input voltage See SETTING UP or CONFIGURING THE INSTRUMENT VIA SETPORTABLE see MAINTENANCE AND CALIBRATION 24 CROWCON Gas Detection You Can Trust Detective Maintenance and Calibration IX Maintenance and Calibration Crowcon recommends monthly gas response checks and a recalibration interval of 6 months Flammable sensors will respond to hydrogen and most hydrocar bons but will only be calibrated for a specific gas typically methane 9 1 Recalibrating R
38. s blocked for any reason the pump is automatically stopped and the warning message PUMP FLOW FAIL appears on the display Attend to the blockage and then restart the pump by pressing the right hand button The pump draws power from the Detective battery pack and so reduces the operating time between recharge by approximately 5 hours before the full stop When the instrument is being calibrated from a pressurised gas source the pump flow plate should be removed and replaced with the calibration flow plate so calibration gas is not drawn into the pump CROWCON 33 Gas Detection You Can Trust Appendix 2 Default Flammable Correction Factors Detective Appendix 2 Default Flammable Correction Factors Gas Correction with respect to methane Correction with respect to pentane 3 character name Pentane 2 0 1 0 PEN Methane 1 0 0 5 CH4 Butane 1 7 0 9 BUT Propane 1 4 0 7 PRO Hydrogen 0 9 0 5 H2 Toluene 2 7 1 4 Ethanol 1 6 0 8 Petrol Vapour 2 5 1 3 Ammonia 0 7 0 4 Methanol 1 3 0 7 LPG 1 4 0 7 Propanol 34 2 0 1 0 CROWCON Gas Detection You Can Trust Detective Appendix 3 Front Panel Text Items Appendix 3 Front Panel Text items This Appendix lists all the possible values the front panel configuration param eters may take Top lev
39. ssed The Detective then calculates offset correction and gain factors necessary to make toxic and mable gas channels read zero and oxygen channels read 20 9 Following a successful zeroing there is the option to END the set up and return to monitor ing or to CONT to continue with setting up PUMP Turns the pump on and off Options are GO and STOP START Selects functions to be enabled at start up instrument switch on Options are NOTHING ZERO LOG ZERO amp LOG 14 CROWCON Gas Detection You Can Trust Detective Configuration options ZERO enables the option of zeroing the sensors at start as per the zero all option above the prompt to zero the sensor will appear several seconds after start up to give the sensors time to settle and will timeout without performing a zero if the YES button is not pressed within about 5 seconds LOG enables data logging at start up and ZERO amp LOG enables both zero and data logging at start up Select NOTHING to disable zero and logging at start up BUTTN The ON button can be programmed to perform various functions when the instrument is in normal gas measurement mode The options available are NOTHING PUMP TWA TOXIC AVERAGE NORMAL NOTHING means all special functions on the button are disabled PUMP allows the pump to be switched off and on without having to enter the menu system to perform this action PEAK TWA TOXIC and AVERAGE are as per th
40. tability of this product
41. tacked together Units MUST NOT be stacked in this fashion during transportation unless they are otherwise suitably secured When stacking units the user must be careful to comply with local health and safety regulations CROWCON 5 Gas Detection You Can Trust Operation Detective Ill Operation 3 1 Switch On Ensure the unit is in clean air Press the ON button to switch on the Detective The instrument will display the message Crowcon Detective and the serial number The unit will test the red alarm LED sounder and alarm bea cons Press the UNMARKED button to silence the alarm Note if the unit is in the presence of a hazardous gas the alarm will continue to operate If alarms are configured to mute see MUTE in section 4 2 Configuration Options then the alarm will not sound and the alarm LED not flash during the switch on process After a short pause the display will change to Testing System and display the current battery voltage If the current date is past a preset calibration due date then the instrument will display Calibration Due See section 3 6 for configuration options If there are different sensor modules in the instrument compared to when it was last used possibly indicating sensor failure the mes sage Sensors changed will be displayed If the instrument s configuration has been lost or corrupted then the message Loading default data will be displayed With all three of these error
42. tes on sensor limitations The built in data logging facility records gas levels of all four channels at user definable intervals for subsequent downloading to a computer This enables a more detailed evaluation of accumulated exposure to be made than is possible with the Time Weighted Average exposure integrator and may yield useful data about gas leak patterns and can provide essential information to an incident inquest The Detective unit is designed for temporary monitoring of working areas where hazardous gases may be present For small area monitoring while per sonnel are working a single unit can be used For protecting larger areas a number of Detective units can be interconnected providing a protective perim eter around the work area See section 6 for details on how to link Detective units together Presence of hazardous gas levels is indicated by three high intensity red light beacons on the top of the unit and a high volume audible sounder on the underside of the unit The main body of the unit is constructed from fire retardant high impact UV stabilised ABS plastic and is protected against water and dust ingress to IP65 The unit can be supplied with either a rugged steel tripod frame or a rigid com posite tripod frame with hinged legs for space saving storage The sensors are located on the underside of the unit for protection a manual aspirator can be attached for spot sampling A pump option for automatic samplin
43. ttached cable at the Main PCB Remove each cable connection to the Main PCB making careful note of where each is attached Remove the Earth connections from the stud at the rear of the PCB mounting chassis plate Remove the four retaining screws from the Main PCB mounting chassis plate where it is secured to the lower half of the casing on either side 2 3 we aH 4 5 wa gt CROWCON 25 Gas Detection You Can Trust Replacing a Sensor Module Detective 6 Remove the Main PCB and its mounting chassis plate exposing the battery pack Remove the battery from the base of the unit and substitute it with the replacement battery pack Ensure that the Battery pack is located within the rectangular retaining features of the lower case moulding Replace the PCB mounting chassis and fix to the lower case Re attach the Earth connections to the Earth stud at the rear of the PCB mounting chassis plate and re fit the cable connectors to their correct positions on the Main PCB Refit the cable lead from the top half of the case to the Main PCB and carefully replace the top half of the case onto the lower half of the case Ensure that the integrity of the edge seal is maintained 10 Replace the centre fixing bolt on top of the unit replace and secure the lamp cover 7 2 2 Note The user must comply with local environmental regulations when dispos ing of battery packs 9 3 Replacing a Sensor Module 2
44. tus Screens Alarm Reset The UNMARKED button has two functions to reset alarms see 3 6 above or to display a series of status screens To view the status screens press the UNMARKED button when the instrument is not in an alarm condition The series of status screens show the following information in sequence Press the UNMARKED button to move onto the next screen and eventually back to the main instrument display of gas levels If the button is not pressed for 20 sec onds the instrument will timeout and return to the main gas reading screen CROWCON 9 Gas Detection You Can Trust Operation Detective The date current time and the time elapsed since instrument switch on is displayed Serial number and calibration due date is displayed Alarm 1 levels are shown for all sensors Short term exposure levels are displayed for toxic sensors Long term exposure levels are displayed for toxic sensors Currently selected user and site are displayed 3 8 Switching Off Before turning the unit OFF purge it with air until all channels read zero and Oxygen reads 20 9 after this turn it of The DETECTIVE is turned OFF by simultaneously pressing the ON button and the UNMARKED button simultane ously and holding them down for about half a second This prevents accidental switch off through knocking the keypad This OFF mode may be disabled via the Menu or using the Portables PC software If the unit is not purged and has gas i
45. warning messages the condition must be accepted by pressing the UNMARKED button indicated on the display with the word CONTINUE above it Calibration due Continue PjCROWCON O O O The instrument can alarm on instantaneous gas levels and on both short and long term Time Weighted Average gas exposure levels Note that the Time Weighted Average toxic gas exposures are reset to zero when the instrument is switched off When the battery reaches a low level an operational unit will display a low bat tery warning Note if the battery is too low the unit will not switch on 6 CROWCON Gas Detection You Can Trust Detective Operation About 10 seconds after the instrument is switched on the Detective will com plete its self tests and indicate the current gas levels If the instrument enters an alarm condition then the sounder will be trig gered and the alarm LEDs will flash Once the gas levels are below alarm levels i e safe gas levels the alarm warning may be switched off by pressing the UNMARKED button If alarms are muted the red alarm LED will not flash nor will the alarm sounder sound when the instrument is in alarm the only indica tion of the alarm condition will be the word ALARM alternately flashing with the gas value of the channel in alarm 3 2 Display The information on the display is dependent on the type of sensors installed in the instrument For each sensor module installed the display indicat
46. with the sensor name The gas value displayed will be the current long term exposure level Non toxic gas sensors will display their normal gas level Peak hold This options affects the displayed gas value for all sensors and is indicated by the letters pk flashing with the sensor name The highest gas level that has been read since instrument switch on will be displayed or in the case of oxygen the lowest level read The peak that has been retained may be reset to the current gas level by pressing the UNMARKED button The peak gas level will then be displayed again from then on In addition to the messages described above if alarms are muted the message MUTED will flash with the sensor name and units 3 3 Overrange If a flammable sensor s signal is out of range then the instrument may be con figured via a PC and the Portables PC software to either flash the relevant numbers on the display or to display a message of the form SENSOR FAILURE and the name of the failed sensor The alarm sounder will activate This type of error could indicate a high gas level or sensor failure Calibration should be checked after such a warning 8 CROWCON Gas Detection You Can Trust Detective Operation 3 4 Cautions Sensors may be adversely affected by exposure to silicones lead compounds high levels of hydrogen sulphide and chlorine and some industrial solvents 3 5 Backlight In low ambient light conditions the backlight c
Download Pdf Manuals
Related Search