Related Manuals for BEKA BA478C
Summary of Contents for BEKA BA478C
- Page 1 BA478C Intrinsically safe panel mounting indicating temperature transmitter Issue 8 Issue 8 February 2015...
- Page 2 7.2.11 Decimal point position ‘dP’ 7.2.12 Lower input & display ‘in-Lo’ 7.2.13 Higher input & display ‘in-Hi’ 7.3 Configuration defaults The BA478C is CE marked to show compliance with the European Explosive Atmospheres Directive 94/9/EC and the European EMC Directive 2004/108/EC...
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Page 3: Operation
1. DESCRIPTION 3. OPERATION The BA478C is a panel mounting, intrinsically safe Fig 1 shows a simplified diagram of the BA478C 4/20mA loop powered temperature transmitter with a Indicating Temperature Transmitter. The input, large easy to read display. The instrument, which is which may be from a resistance thermometer, ... -
Page 4: Intrinsic Safety Certification
This allows the BA478C to be installed in all Zones 4. INTRINSIC SAFETY CERTIFICATION The BA478C Indicating Temperature Transmitter is and to be used with most common industrial gases. intrinsically safe allowing installation in Zone 1 or 2 when protected by a safe area Zener barrier or galvanic isolator. - Page 5 Zener barrier(s). 46.5nF 0.01mH Fig 2 illustrates the simplest and least expensive configuration in which a BA478C is powered from an isolated (floating) power supply. Only one barrier is required, as the other wire is earthed at the barrier busbar.
- Page 6 Fig 3. A galvanic isolator can supply a higher voltage than a Zener barrier to a loop powered transmitter and is able to power a BA478C transmitter fitted with an optional display backlight which has a minimum operating voltage of 15.5V.
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Page 7: Installation
to HART signals. 5.3 Use as a temperature indicator The BA478C may also be used as just a temperature indicator by ignoring the instrument’s 4/20mA output current. The same Zener barriers or galvanic isolators required for transmitter operation are required, but the load resistor may be omitted. - Page 8 6.2 Installation Procedure 6.3 EMC The BA478C complies with the requirements of the a. Insert the BA478C into the instrument panel European EMC Directive 2004/108/EC. For specified cut-out from the front of the panel with the immunity, all wiring should be in screened twisted sealing gasket positioned as shown in Fig 6.
- Page 9 Digital display units and resolution to be selected. directly to the BA478C or to the galvanic isolator powering the transmitter, alternatively proprietary Bargraph display to represent required part of the configuration software operating on a personal digital displayed range.
- Page 10 For Thermocouple Input – see Fig 7 Transmitter Summary display of function Transmitter Summary display of function ‘FAuLt’ Sensor fault analogue indication Selects 1 of 3 under/over range output currents to indicate that a sensor fault has ‘t.tYPE’ Thermocouple type Selects common types...
- Page 11 Units Transmitter Display 7.2.1 Transmitter input ‘InPut’ This function enables BA478C indicating temperature transmitter to be conditioned to operate with a thermocouple, 3 or 4 wire resistance When C or F are selected the units of measurement thermometer, voltage or 3 or 4 wire resistance input.
- Page 12 in the sub-menu, pressing P again will reveal the 7.2.6 Sensor fault analogue indication ‘FAuLt’ The sensor fault analogue indication function appears existing transmitter input at which the transmitter in the menu when the transmitter is configured for a output current is 4mA. Input is shown in units which resistance thermometer or a thermocouple input.
- Page 13 The ‘bAr’ function may be selected from within the If the access code is lost please contact BEKA configuration menu by operating the ▼ or ▲ button. associates. To enter the function press P which will display the ‘b.tYPE’...
- Page 14 7.2.12 Lower input & display ‘in-Lo’ 7.2.13 Higher input & display ‘in-Hi’ This function, which only appears in the menu when This function which only appears in the menu when the transmitter is configured for a voltage or the transmitter is configured for a voltage or resistance input, defines the transmitter lower input resistance input, defines the transmitter higher input voltage or resistance ‘inVAL’...
- Page 18 7.3 Default configuration If the transmitter’s configuration is not specified at the time of ordering, the instrument will be configured as follows but can easily be reconfigured on-site. Function Factory default 3 wire RTD Transmitter input ‘InPut’ Pt100 Sensor type ‘t.tYPE’ ºC Units of digital display ‘dEG’...
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Page 19: Configuration Example
Press E to enter the selection and return Configuration is performed using the front panel push the transmitter display to the ‘dEG’ buttons – see Fig 5. The BA478C can be supplied prompt in the configuration menu. with factory fitted external push buttons if frequent adjustments are required. - Page 20 P button to transfer control configuration menu. to the next digit, set the display to 1209. Press E twice to enter the new access code and return the BA478C to the display mode via the ‘CodE prompt. Step 7 Configuration of bargraph display See: Fig 8 and section 7.2.8...
- Page 21 Check No display or Incorrect wiring Wiring output current Low supply If a BA478C fails after it has been functioning voltage That voltage correctly the following procedure should be followed: between terminals 5 & 6 is between 9 & 28V at all output...
- Page 22 Fig 10 Alarm outputs When an alarm is activated an annunciator appears on the left hand side of the BA478C display. This shows which alarm has been activated and will flash if the alarm is delayed or silenced. Programmable functions for each alarm include adjustable setpoint, hysteresis, alarm delay and alarm accept.
- Page 23 Clause 5.7 of EN60079-11. This allows each of the 10.3.3 Alarm configuration BA478C alarm outputs to be connected to any Alarm configuration may be performed via the HART intrinsically safe circuit protected by a Zener barrier ...
- Page 24 Summary of programmable alarm functions Display Description of function ‘ALr1’ Alarm 1 ‘ALr2’ Alarm 2 The two functions each contain seven identical sub-functions, configuration alarm 1 and the other for configuration alarm 2. See section 10.3.4 and Fig 13. 'EnbL' Alarm enable Enables or disables the alarm function without changing the alarm parameters.
- Page 26 A BA478C transmitter with a high alarm set at the decimal point before adjusting ‘SP1’ or ‘SP2’. 90.0 and hysteresis of 10.0 will perform as follows:...
- Page 27 10.3.12 Access Setpoint: ACSP This function controls a separate menu that provides direct access to the alarm setpoints when the BA478C transmitter is in the operational mode. The function enables an operator to adjust the alarm setpoints without having access to the configuration and alarm menus.
- Page 28 10.3.13 Adjusting alarm setpoints from the operational mode Access to the alarm setpoints from the transmitter operational mode is obtained by operating the P and ▲ push buttons simultaneously as shown in Fig 14. If the setpoints are not protected by a security code the alarm setpoint prompt 'SP1' will be displayed.
- Page 29 (classified) locations without the need for Zener barriers or galvanic isolators. US installations A1.0 Factory Mutual Approval For installations in the USA and Canada the BA478C must comply with the BEKA associates Control has FM and cFM intrinsic safety and nonincendive...
- Page 37 APPENDIX 2 A2.2 Installation The BA478C IECEx and ATEX certifications have IECEx certification identical intrinsic safety parameters and installation requirements. ATEX system design A2.0 The IECEx Certification Scheme IECEx is a global certification scheme for explosion requirements described in section 5 of this manual...
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