BEKA BA354ND, Manual

Page 1: ...Issue 3 11th November 2009 BA354ND Type n certified 4 20mA loop powered field mounting rate totaliser issue 3...

Page 2: ...e P push button 6 13 Total scale factor 6 14 Percentage clip off 6 15 Local reset of total display 6 16 Security code 6 17 Over and under range 7 Calibration Examples 7 1 Using an external current sou...

Page 3: ...oped across R1 which is proportional to the 4 20mA input current provides the input signal for the analogue to digital converter Each time a 4 20mA current is applied to the instrument initialisation...

Page 4: ...sc in the lower left hand corner indicator of the display rotates when the input current exceeds 4mA 3 TYPE n CERTIFICATION 3 1 Certificate of Conformity ITS Testing and Certification Ltd Formerly ERA...

Page 5: ...mmon industrial gases 3 6 Certification Label Information The ATEX certification label is fitted in a recess on the top outer surface of the enclosure The year of manufacture and instrument serial num...

Page 6: ...gn requirements listed in section 4 1 If suitably certified the flowmeter may also be located in Zone 2 as shown in Fig 3B Both examples show an external reset switch Alternatively the BA354ND may be...

Page 7: ...safe area To prevent circulating currents cable screens should only be earthed at one point in the safe area The BA354ND enclosure is supplied with a bonding plate to ensure electrical continuity bet...

Page 8: ...8 Fig 5 Dimensions and terminal connections...

Page 9: ...s displayed on the five digit display Using the instrument s CAL or SEt functions this display may be calibrated to show the flow rate in engineering units Both the zero display at 4mA and the span di...

Page 10: ...cimal point clip off to adjust value Press or between 0 and 10 or and pressing Define Security Enter by Code to move to next digit Local reset or Fig 7B Programme Structure CLr Gtot E E E E E E E E P...

Page 11: ...arly set the required full scale display accurate 20mA input current scale display using an Similarly set the required full to move to next digit pressing or and set required zero display by With accu...

Page 12: ...l new BA354ND rate totalisers are supplied calibrated as requested at the time of ordering If calibration information is not supplied the BA354ND will be set to display a rate of 0 00 with 4mA input a...

Page 13: ...n and 4 20 to display current See section 6 12 Display Description of function SCALE T Total Scale Factor Defines the arithmetic relationship between the rate and total displays May be adjusted betwee...

Page 14: ...ned press E to return to the main menu If the application requires flow rate to be the primary display i e shown on the large display the d P function enables the rate and total displays to be interch...

Page 15: ...ing the Up and Down buttons and the P button to move to the next digit enter the password SurE Pressing E will then give access to the sub menu Note S is entered as 5 6 9 1 AC rejection FrE WARNING If...

Page 16: ...lay rate display divided by Per second tb 1 1 Per minute tb 60 60 Per hour tb 3600 3600 Select the required divisor and press E to return to the main menu 6 12 Function of the P push button C P This p...

Page 17: ...e of total flow may be adjusted in one percent increments using the Up or Down buttons When set as required press the E button to enter the revised figure and return to the main programme menu 6 15 Lo...

Page 18: ...ing a traceable 4 20mA calibrator Section 7 2 contains an example of calibration using the instruments internal 4 and 20mA references which although not traceable are adequate for many industrial appl...

Page 19: ...significant digit of the total display and following decimal point are flashing i e a resolution of 0 1 Press P to move control to the rate display Using the Up or Down push button move the flashing d...

Page 20: ...12 Reset the grand total to zero To reset the grand total to zero select CLr Gtot from the main menu and press P which will cause the instrument to display Clr no Toggle this to CLr YES using the Up o...

Page 21: ...by simultaneously pressing P and E Assuming a security code has not already been entered the instrument will respond by displaying root which is the first function in the main menu Steps Perform as de...

Page 22: ...8 8 2 Fault finding after commissioning ENSURE PLANT SAFETY BEFORE STARTING MAINTENANCE Live maintenance should only be performed when there is no risk of a flammable atmosphere being present and dus...

Page 23: ...accessory boards to the terminals should be un plugged The replacement display assembly may then be installed and the enclosure reassembled If after replacement of the display assembly the instrument...

Page 24: ...programmed as high or low rate or total alarms with normally open or normally closed outputs Fig 9 illustrates the conditions available for a rate alarm and shows which are fail safe i e output is in...

Page 25: ...he SCALE t functions and each alarm may be programmed as a rate or a total alarm For simplicity Fig 12 only shows the programmable functions on the rate option of alarm AL1 Alarm 2 and the total optio...

Page 26: ...s setpoint Sub menu which enables direct access to the alarm setpoints from the operating mode and defines a separate security code See section 9 2 12 9 2 4 Alarm enable EnbL This function allows the...

Page 27: ...to reveal the current setting The function can be changed by pressing the Up or Down button followed by the E button to return to the alarm menu 9 2 9 Hysteresis HStr Hysteresis is only available on r...

Page 28: ...de press E to return to the EnbL prompt followed by the Up or Down button to select the access code prompt AcCd Pressing P will reveal the current security code Each digit of the code may be changed b...

Page 29: ...14 providing the supply voltage is below 30V the backlight safety components will ensure that the input current is less than 100mA Fig 14 Backlight powered by Zener barrier Reducing the supply voltag...

Page 30: ...commissioning 8 1 after commissioning 8 2 Flow indicator 2 2 Flow transmitter loops 4 1 Gas groups 3 5 Grand total 2 1 clear 6 3 6 10 Guarantee 8 5 HI LO 9 2 3 9 2 7 HStr 9 2 3 9 2 9 Input 4 20mA 3 3...