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Issue: 4

October 2010

BA358C

Intrinsically safe

4/20mA loop powered

panel mounting

rate totaliser

Issue 4

Certification

information
label

Rate

display

Annunciators for

optional alarms

Rotating flow
indicator

Total

display

Содержание BA358C

Страница 1: ...October 2010 BA358C Intrinsically safe 4 20mA loop powered panel mounting rate totaliser Issue 4 Certification information label Rate display Annunciators for optional alarms Rotating flow indicator T...

Страница 2: ...1 Timebase 6 12 Function of the 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...

Страница 3: ...sed diode D1 The voltage developed across D1 which is relatively constant is multiplied by a switch mode power supply and used to power the instrument The voltage developed across R1 which is proporti...

Страница 4: ...eds 4mA 3 INTRINSIC SAFETY CERTIFICATION 3 1 ATEX certificate The BA358C has been issued with an EC Type Examination Certificate by Notified Body Intertek Testing Services ITS formerly ERA Technology...

Страница 5: ...Zones gas groups and T rating The BA358C has been certified to show compliance with the requirements for Group II Category 1G equipment EEx ia IIC T5 When connected to a suitable system the instrumen...

Страница 6: ...dication of rate and total flow within a hazardous area The type of interface is not critical either a Zener barrier or a galvanic isolator may be used providing that Uo Io and Po are not exceeded If...

Страница 7: ...esetting from the safe area via a single channel diode return Zener barrier A certified intrinsically safe relay or certified opto isolator may also be used Fig 3B shows how the total display may be r...

Страница 8: ...lective displays there is little degradation of contrast when viewed from above the centre line but slight degradation may be noticeable when the instrument is fitted with a backlight Fig 4 BA358C dim...

Страница 9: ...in the rate display is defined by the d p function To simplify calibration the BA358C uses floating point arithmetic moving the rate display decimal point position will therefore affect totalisation T...

Страница 10: ...of 0 00 with 4mA input and 100 00 with 20mA input The total scale factor will be set to 1 0000 with a timebase of flow per second The instrument can easily be recalibrated on site 6 3 Summary of progr...

Страница 11: ...input current in milliamps or the input as a percentage when the P push button is operated in the display mode Select PC for of span and 4 20 to display current See section 6 12 Display Description o...

Страница 12: ...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...

Страница 13: ...or and Similarly 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...

Страница 14: ...s Operating the P push button will toggle control between the two displays When both decimal points have been correctly positioned press E to return to the main menu If the application requires flow r...

Страница 15: ...ay 0000 Using the Up and Down buttons and the P button to move to the next digit enter the password SurE S is entered as 5 Pressing E will then give access to the sub menu 6 9 1 AC rejection FrE WARNI...

Страница 16: ...our 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 parameter defines the function of the P push button when the BA358C is i...

Страница 17: ...lect CLIP OFF from the main menu and press P to reveal the current setting This clip off threshold is shown as a percentage of total flow and may be adjusted in one percent increments using the Up or...

Страница 18: ...ction 7 1 describes the preferred method of calibration using an external traceable 4 20mA calibrator Section 7 2 contains an example of calibration using the BA358C internal 4 and 20mA references whi...

Страница 19: ...git of the total display flashing Press the Up or Down push button until the second least significant digit and following decimal point of the total display flash This gives the required total display...

Страница 20: ...to the main menu by pressing E Step 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 T...

Страница 21: ...multaneously 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 describ...

Страница 22: ...terminals 1 3 No power supply Confirm that a 4 20mA current is flowing in the loop Unstable rate display 4 20mA current is noisy or the flow signal is unstable Eliminate source of electrical noise Red...

Страница 23: ...ons available for a rate alarm and shows which are fail safe i e output is in the alarm condition open when the 4 20mA input current is zero Similarly when programmed as a total alarm the output shoul...

Страница 24: ...nt capacitance and inductance of each BA358C alarm output is Ci 40nF Li 20 H The maximum permissible cable parameters for the alarm circuit will be the figures specified for the barrier or isolator le...

Страница 25: ...veal 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 3 5 Type of alarm tYPE This function conditions the alarm...

Страница 26: ...Down button followed by the E button to return to the alarm menu 9 3 9 Hysteresis HStr Hysteresis is only available on rate alarms During programming hysteresis is shown in the units of rate the BA358...

Страница 27: ...This direct access menu is enabled and a separate security code entered from the AcSP function in the main programme menu To change the menu parameters select AcSP from the programme menu and press P...

Страница 28: ...is segregated from the measuring circuit and has been certified as a separate intrinsically safe circuit but it does not comply with the requirements for simple apparatus Systems certificates for use...

Страница 29: ...ere the instrument is likely to be damaged by impact an additional front cover is available The BA398 is a robust transparent cover which is secured to the panel by six screws and sealed with a neopre...

Страница 30: ...missioning 8 1 after commissioning 8 2 Flow indicator 2 2 Flow transmitter loops 4 1 Galvanic isolators 4 0 Gas groups 3 4 Grand total 2 1 clear 6 3 6 10 Guarantee 8 5 HI LO 9 3 3 9 3 7 HStr 9 3 3 9 3...

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