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11.4

Routine maintenance

The  mechanical  and  electrical  condition  of  the
instrument should be regularly checked.  Inspection
frequency  should  be  chosen  to  suit  the
environmental conditions.

11.5

Guarantee

Instruments which fail within the guarantee period
should be returned to BEKA associates or our local
agent. It is helpful if a brief description of the fault
symptoms is provided.

11.6

Customer comments

BEKA is always pleased to receive comments from
customers about our products and services. All
communications are acknowledged and whenever
possible, suggestions are implemented.

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Summary of Contents for BA374NG

Page 1: ...Issue 3 5th March 2018 BA374NG Ex nA and Ex tc Two input Timer or Clock Issue 3 ...

Page 2: ...guration functions 6 5 3 Instrument function FunCtion 6 5 4 Input A inPut A 6 5 5 Input type inP TYPE 6 5 6 Debounce debounce 6 5 7 Input b inPut b 6 4 8 Lower display di5P 2 6 5 9 Starting stopping the Timer 5tAr5toP 6 5 10 Units of display unit5 6 5 11 Set time 5Et t 6 5 12 Repeat timing cycle CYCLE5 6 5 13 Cycle function enable EnbL 6 5 14 Cycle count cycl cnt 6 5 15 Restart delay r5t dela 6 5 ...

Page 3: ... t 9 4 7 Status output 5tat 9 4 8 Enable status output enbl 9 4 9 Status output on and off times 5tat on 1 5tat off 1 5tat on 2 5tat off 2 9 4 10 Control output 1 oP1 9 4 11 Enable Control output 1 EnbL 9 4 12 Control output 1 on and off times oP 1 on 1 oP 1 off 1 oP 1 on 2 oP 1 off 2 9 4 13 Control output 2 oP2 9 4 14 Enable control output 2 EnbL 9 4 15 Control output 2 on and off times oP2 on 1 ...

Page 4: ...s areas 4 Installations 5 Accessories Timer 6 Operation as a timer 7 Timer application example 8 Maintenance Clock 9 Operation as a clock 10 Clock configuration example 11 Maintenance The BA374NG has been ATEX certified Ex nA and Ex tc by Notified Body Intertek Testing and Certification Ltd and complies with the European ATEX Directive 2014 34 EU The main sections of this manual describe ATEX Ex n...

Page 5: ...uring conditions of normal operation The Timer or Clock s front panel push button contacts are non incendive and have been certified intrinsically safe Ex ic as shown on the Type Examination Certificate This allows the Timer or Clock to be adjusted and configured live when installed in Zone 2 When connected to a suitable system the BA374NG Timer or Clock may be installed in Zone 2 explosive gas ai...

Page 6: ...types of sensor requiring energising link fitting Safety parameters Input Output Type of input Link Ui Uo Io Switch contact Yes 15V 10 5V 9 2mA Proximity detector Yes 15V 10 5V 9 2mA Open collector Yes 15V 10 5V 9 2mA Magnetic pick off No 30V 1 1V 0 5mA Voltage input low No 30V 1 1V 0 5mA Voltage input high No 30V 1 1V 0 5mA For input A link terminals 3 and 4 For input b link terminals 7 and 8 2 7...

Page 7: ... terminals 2 6 10 and RS2 are interconnected within the BA374NG See Fig 10 3 1 Power supply The BA374NG Timer or Clock requires a minimum of 10V between terminal 1 2 and consumes 10mA without optional backlight plus 6mA when terminals 3 4 are linked plus 6mA when terminals 7 8 are linked plus 16mA with optional backlight A 24V dc regulated current limited supply located in a safe area is suitable ...

Page 8: ...ng which is achieved by linking Timer or Clock terminals 3 and 4 for input A and terminals 7 and 8 for input b Fig 3 BA374NG connected to safe area sensors 3 2 2 Switch contact input Any mechanically or magnetically activated switch contact located in Zone 2 or in the safe area may be directly connected to pulse input terminals 5 and 6 and to terminals 7 and 8 Both Timer or Clock pulse inputs are ...

Page 9: ... configurable debounce circuit to prevent false triggering See section 6 5 6 3 2 7 Remote reset Connecting the external reset terminals RS1 and RS2 together will reset the BA374NG when configured as a Timer and synchronise the displayed time to a preset time when configured as a Clock Remote resetting may be accomplished by any mechanically operated switch located in the same Zone 2 hazardous area...

Page 10: ...t with the following input parameters Ui 30V dc Ii 200mA This allows each control output to switch any dc circuit providing that in normal operation the maximum supply voltage is not greater than 30V dc and the switched current is not greater than 200mA Providing that the BA374NG Timer or Clock is correctly installed in Zone 2 the two control outputs may be used to switch suitably protected equipm...

Page 11: ...onductor An insulated M4 stud is provided in the bottom right hand corner of the back box for interconnecting cable screens The BA374NG Timer or Clock may be pipe mounted using a BA393G pipe mounting kit 4 2 Installation Procedure Fig 7 illustrates the instrument installation procedure A Remove the Timer or Clock assembly by unscrewing the four captive A screws B Mount the enclosure back box on a ...

Page 12: ... the instrument is ordered a blank scale card will be fitted which can easily be marked on site with a dry transfer or a permanent marker Custom printed scale cards are available from BEKA associates as an accessory To remove the scale card from a Timer or Clock carefully pull the transparent tab at the rear of the instrument assembly away from the assembly as shown in Fig 9a Fig 9a Removing scale...

Page 13: ...wing the units of measurement and tag information specified when the instrument was ordered If this information was not supplied a blank scale card will be fitted which can easily be marked with a dry transfer or a permanent marker on site Custom printed scale cards are available as accessories and may be easily fitted as shown in section 4 4 of this manual 5 4 Legend plate The BA374NG can also be...

Page 14: ...ed by the instrument which can be viewed by operating the front panel push buttons and reset from the display mode or from within the configuration menu Fig 10 shows a simplified block diagram of the BA374NG when configured as a Timer The two separate inputs A and b can be individually configured to accept inputs from a wide variety of sensors When the sensor requires energising to detect its stat...

Page 15: ...16 Shows in succession firmware version number instrument function elap5e and any output accessories that are fitted A Dual control outputs P Status output Always fitted Accesses the configuration menu 6 3 Displays when configured as a Timer The BA374NG has two digital displays and associated annunciators as shown on front cover of this manual Elapsed time The upper display shows the elapsed time ...

Page 16: ...s to Running Complete Entered automatically from Running when there are no more timing cycles to perform When the CYCLE5 function is enabled the timing cycle can be specified to repeat up to 99 times or can be configured to repeat continuously 6 5 Configuration as a Timer The BA374NG is configured via the four front panel push buttons All the configuration functions are contained in an easy to use...

Page 17: ...as been entered pressing will cause the first parameter FunCtion to be displayed If an incorrect code is entered or a push button is not operated within ten seconds the instrument will automatically return to the display mode All configuration functions and prompts are shown on the upper eight digit display Once within the main configuration menu the required parameter can be selected by scrolling...

Page 18: ...vel of input debounce applied to the input A to prevent false counting dEFAuLt HEAVY LiGHt See section 6 5 6 Display Summary of function inPut b Configuration of input b As configuration of inPut A Energise input by linking terminals terminals 7 8 for Input b See section 6 5 7 di5P 2 Lower display Configures the lower display to show set time 5Et t or when the CYCLE5 repeat function is activated t...

Page 19: ...e to protect access to 5Et t from the display mode See section 6 5 16 Display Summary of function uP or dn Direction of count Defines whether the Timer times up from zero to the set time 5Et t or times down from 5Et t to zero See section 6 5 17 P FAiL Power Failure Defines how the Timer functions when power is restored after a power failure Contains three alternative options idle Pau5E and continu...

Page 20: ... Summary of function Control output 1 on oP1 on Control output 1 turns on when the Timer enters the state selected in this function Output phase can be reversed See section 6 5 30 Control output 1 off oP1 oFF Control output 1 turns off when the Timer enters the state selected in this function Output phase can be reversed See section 6 5 31 Control output on delay oP1 dELA Introduces a specified de...

Page 21: ...n menu One of following six types of input may be selected Display Input type Switching thresholds Low High oPCoL Open collector 2 10kΩ VoLt5 L Voltage pulse low 1 3V VoLt5 H Voltage pulse high 3 10V CoiL Magnetic pick off 0 40mV Pr dEt Proximity detector 1 2 2 1mA ContACt Switch contact 100 1000Ω Notes 1 Maximum voltage input 28V 2 For sensors connected to input A that require energising i e a pr...

Page 22: ...ith the current cycle number During the configurable delay period between cycles the display times down from the requested delay to zero A brief notification of timer status i e CYCLE or dELAY is shown at the start of each period 02 11 Current Number of cycles cycle number requested not shown when cycle is continuously repeated LabEL Exactly the same as 5td but timer status i e CYCLE or dELAY is s...

Page 23: ...the configuration menu and press which will reveal the existing setting which can be changed by pressing the or button followed by the button to enter the selection and return to the configuration menu The options available are shown in the following tables Display 12 00 00 Hours minutes seconds 12 00 Hours minutes 30 00 Minutes seconds 30 Seconds Only available when time specified in seconds for ...

Page 24: ...24 ...

Page 25: ...25 ...

Page 26: ...o be repeated with the most significant flashing The flashing digit may be adjusted by pressing the or button followed by the button to transfer control to the next digit When set as required enter the selection and return to the cycl cnt prompt in the sub menu by operating the button 6 5 15 Restart delay r5t dela This sub function defines the time delay between repeat timing periods It is shown i...

Page 27: ...hown on the upper display Timing resumes when a start instruction is received If a start input exists when power is restored timing will start immediately Continue When power is restored the Timer will continue from where it stopped without any manual intervention To check or change the function select P fail from the configuration menu and press which will reveal the existing setting which can be...

Page 28: ...ates such as n re5et If the status output is required to be on in only one Timer state this can be achieved with the following configuration 5tat on state required e g run 5tat off n state required e g n run In this example when the Timer enters the run state the status output turns on When the Timer moves from the run to any other state the status output turns off 6 5 24 Status output enable EnbL...

Page 29: ...o the status output sub menu 6 5 28 Control output 1 optional op1 Control output 1 is an optional factory fitted galvanically isolated solid state switch contact which can be configured to turn on and off when the Timer enters a specified states When control output 1 is on the 1 annunciator on the Timer display is activated The function contains four sub functions EnbL op1 on op1 oFF and op1 dELA ...

Page 30: ...ptions Display Control output 1 turns off when Timer enters selected state re5et Reset state run Running state pau5ed Paused state delay Restart delay state done Complete state Control output 1 turns off when Timer enters any other than the selected state n re5et Reset state n run Running state n pau5ed Paused state n delay Restart delay state n done Complete state When the required setting has be...

Page 31: ...d to gain access New instruments are configured with the default security code 0000 which allows unrestricted access to all configuration functions To enter a new security code select CodE from the configuration menu and press which will cause the Timer to display 0000 with one digit flashing The flashing digit may be adjusted using the or push button when set as required operating the button will...

Page 32: ...BA374NG Timer requires dual control outputs which are a factory fitted option and should be specified when the instrument is ordered Control output 1 is used to switch the Ex nA solenoid valve and control output 2 is wired to the Timer s reset terminals to perform the automatic resetting at the end of the timing cycle see Fig 10 The control outputs are configured so that control output 1 is closed...

Page 33: ...peat cycle CYCLE5 Enable repeat cycle EnbL off Power failure p fail idle Local total reset rE5Et EnbL on Local grand total reset CLr Gtot oFF External reset e r5et fa5t Enable status output EnbL on Status output on at 5tat on re5et Status output off at 5tat oFF n re5et Statussoutput delay 5tatdELA 00000 Enable control output 1 EnbL on Control output 1 on at oP1 on run Control output 1 off at oP1 o...

Page 34: ...olenoid valve The timer then counts down the 15 minute delay which is shown on the lower display display 2 When the delay equals zero control output 1 closes again for a second 10 minutes the whole cycle being repeated such that the solenoid valve opens and closes 4 times After the solenoid valve has closed for a forth time control output 2 closes which illuminates a Sequence Complete lamp indicat...

Page 35: ...me from display mode AC5Et t oFF Direction of count uP or dn dn Control output after power restoration P FAiL PAu5E Local total reset LoC r5Et oFF External Reset Contact Closure Time E r5Et 5td Status Output 5tAt oP dEFAuLt Output 1 oP1 Enable control output 1 EnbL on Control output 1 on at oP1 on run Control output 1 off at oP 1 oFF n run Control output 1 delay oP1 dELA 00000 Output 2 oP2 Enable ...

Page 36: ...ons inspection and maintenance permits live maintenance in Zone 2 if a risk analysis demonstrates that this does not introduce an unacceptable risk The removal of covers opening of Ex n instrument enclosure is permitted if this can be done without contaminating the interior of the instrument with dust or moisture Some end users may prefer not to permit live maintenance to minimise risk ENSURE PLAN...

Page 37: ...d be regularly checked Inspection frequency should be chosen to suit the environmental conditions 8 5 Guarantee Instruments which fail within the guarantee period should be returned to BEKA associates or our local agent It is helpful if a brief description of the fault symptoms is provided 8 6 Customer comments BEKA is always pleased to receive comments from customers about our products and servic...

Page 38: ...a BA374NG initialisation is performed After a short delay the following display sequence occurs All segments of the display are activated Instrument starts functioning using the configuration information stored in the instrument s permanent memory Following initialisation the instrument will display a flashing display which is a request for the local time to be entered The clock will not start to ...

Page 39: ...rol output 2 EnbL oFF Enable access alarm AC5P oFF times from display mode Access code for alarm ACCd 0000 times from display mode Note Control outputs are a factory fitted option 9 4 1 Accessing configuration functions Throughout this manual push buttons are shown as and and legends displayed by the Clock are shown in a seven segment font just as they appear on the instrument e g di5PLAY and CodE...

Page 40: ...40 ...

Page 41: ...41 ...

Page 42: ...tput Status output can turn on open collector on and off open collector off once or twice in each twenty four hour period This function contains five sub function EnbL Enables Status output and defines if it turns on and off once or twice in each 24 hours 5tat on 1 Time when oP 1 turns on 1st time 5tat oFF 1 Time when oP 1 turns off 1st time 5tat on 2 Time when oP 1 turns on 2nd time 5tat oFF 2 Ti...

Page 43: ...t to the display mode To configure the Clock enter the configuration menu by pressing the and buttons simultaneously until function is displayed 9 4 4 Display format di5PLAY The BA374NG Clock may be configured to display time in a 12 or 24 hour format with or without seconds When a 12 hour format is selected AM is denoted by an A prefix at the left hand side of the display similarly a P is display...

Page 44: ...rns on off once per 24 hours on 2 Turns on off twice per 24 hours When the required option is displayed operating will enter the selection and return to the EnbL prompt from which another sub function may be selected 9 4 9 Status output On and off times 5tat on 1 5tat off 1 5tat on 2 5tat off 2 The status output will have one or two on and off times depending upon whether it has been configured to...

Page 45: ...een entered return to the configuration menu by pressing the button twice 9 4 13 Control output 2 oP2 Control output 2 is an optional factory fitted output which can be configured to turn on output closed and off output open twice in each twenty four hour period The control output status is shown by the 2 control output display annunciator Function oP2 contains a sub menu with five sub functions E...

Page 46: ...mes from the display mode may be protected by a four digit alphanumeric security code which must be entered to gain access Default security code 0000 allows unrestricted access With ACCd displayed press to enter a new access code The BA374NG Clock will display 0000 with one digit flashing The flashing digit may be adjusted using the or push button when set as required operating the button will tra...

Page 47: ...n change the instrument to a Clock and return the display to FunCtion in the configuration menu See 9 4 3 Step 3 Select display format Using the or button select di5PLAY in the configuration menu and press which will reveal the current display format Using the or button select 24 00 00 which is the required 24 hour format with seconds and press to enter the selection and return to the configuratio...

Page 48: ...access to the configuration menu Using the and buttons select CodE from the configuration menu and press which will reveal 0000 with the first digit flashing This example requires the security code to be 1209 using the and buttons set the flashing digit to 1 and press to transfer control to the second digit When all have been entered press to return to the main configuration menu See 9 4 17 Step 9...

Page 49: ...l of covers opening of Ex n instrument enclosure is permitted if this can be done without contaminating the interior of the instrument with dust or moisture Some end users may prefer not to permit live maintenance to minimise risk ENSURE PLANT SAFETY BEFORE STARTING MAINTENANCE Live maintenance within the hazardous area should only be performed when it is permitted by risk analysis or when there i...

Page 50: ...1 5 Guarantee Instruments which fail within the guarantee period should be returned to BEKA associates or our local agent It is helpful if a brief description of the fault symptoms is provided 11 6 Customer comments BEKA is always pleased to receive comments from customers about our products and services All communications are acknowledged and whenever possible suggestions are implemented ...

Page 51: ... tc certificate indicated by the certificate number s X suffix These state that the BA374NG Timer or Clock should be a Supplied from a limited energy circuit with output parameters in normal operation equal to or less than the instrument s input parameters The certificate states that It is not necessary to power the instrument from an intrinsically safe interface such as a certified shunt diode sa...

Page 52: ...dentical to the ATEX safety parameters described in the main section and Appendix 1 of this manual The IECEx certificate may be downloaded from the BEKA associates or the IECEx website or may be requested from the BEKA sales office A2 2 Installation The IECEx and ATEX certificates specify identical safety parameters and installation requirements for both gas and dust approvals as defined by IEC 60...

Page 53: ...Gc Zone 22 AEx ic tc IIIC T80ºC Dc Ta 40 C to 60 C cETL codes for Canada Ex nA ic IIC T5 Gc Ex n IIC T5 Gc Ex ic tc IIIC T80ºC Dc Class III Div 2 Class II Div 2 Gp F G Ta 40 C to 60 C The ETL and cETL safety parameters are the same as ATEX and IECEx parameters therefore the systems shown in the main section of this manual and in Appendix 1 may be used for US and Canadian installations subject to c...

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