Related Manuals for BEKA BA374C
Summary of Contents for BEKA BA374C
- Page 1 BA374C Intrinsically safe field mounting indicating temperature transmitter Issue: 5 3rd December 2003...
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Page 2: Table Of Contents
6.6 4/20mA output current calibration 12. Backlight 6.7 Security code 6.8 Calibrating the internal references 6.8.1 Conditioning internal references 6.8.2 Voltage input reference The BA374C is CE marked to show compliance with the European Explosives Atmospheres Directive 94/9/EC and the European EMC Directive 98/336/EEC... - Page 3 By following the notes in this manual you should be able to set up your BA374C without any problem. However, If you do run into difficulties Section 9 provides some guidance on typical problems you may find during commissioning.
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Page 5: Description
1. DESCRIPTION measurement applies linearisation using look-up tables stored in permanent memory. The The BA374C is an intrinsically safe 4/20mA loop powered transmitter incorporating a large easy to resulting temperature is shown on the internal read display. The instrument may be programmed display and controls the 4/20mA output current. -
Page 6: Intrinsic Safety Certification
4/20mA output signal. The transmitter is normally powered This allows the BA374C to be installed in all Zones from the safe area so a Zener barrier or galvanic and to be used with most common industrial gases isolator is required to protect the circuit. -
Page 7: Electrical System Design For Installations In Hazardous Areas
BA374C: The intrinsic safety parameters of the Zener barrier must be equal to or less than: Fig 3 BA374C powered from a common supply 280mA When designing any loop it is necessary to 0.85W... -
Page 8: Installation
5.1 Location procedure. The BA374C indicating transmitter can be supplied in either a glass reinforced polyester (GRP), or an a. Remove the enclosure cover by unscrewing epoxy painted aluminium enclosure. Both provide the four captive 'A' screws. -
Page 9: Emc
5.3 EMC push-button to move to the next digit. If the The BA374C complies with the requirements of the correct code is entered pressing E will cause the European EMC Directive. For specified immunity first parameter 'InPut' to be displayed. If an incor- all wiring should be in screened twisted pairs. -
Page 10: Summary Of Programme Menu Functions
Selects the type of thermocouple input. information is stored in permanent memory. See section 6.3.1 All new BA374C indicators are supplied calibrated 'dEg' Units of display as requested at the time of ordering. If calibration... -
Page 13: Description Of Programme Menu Functions
Display Summary of Programme Menu 6.2.1 Transmitter input 'InPut' functions This function conditions the transmitter to accept a thermocouple 'tHC', resistance thermometer 'rtd' or a voltage 'UOLt' input. To define the 'In-HI' High input sub-menu transmitter input select 'InPut' from the programme Enables the higher voltage input 'InPut' menu and press P which will reveal the current and the corresponding display 'diSP' to... -
Page 14: Display Units
Display Resolution 6.4.2 Display units 'dEg' Type Low (Lo) High (Hi) The transmitter display may be in degrees centigrade or Fahrenheit. To check or change the display units select 'dEg' from the sub-menu and press P to reveal the current setting. The setting may be changed by pressing the Up or Down button. -
Page 15: Low Input & Display Calibration
Note: If a complete loop including a primary input voltage. element, BA374C temperature transmitter and a load are being calibrated, the Trim Menu is the Select 'In-HI' from the menu and press P which will preferred method. -
Page 16: Security Code
For example, a BA374C with a thermocouple input Each digit of the code can be changed using the from which the 4/20mA output current is being... -
Page 17: 3-Wire Rtd Reference
7. TRIM MENU The Trim Menu is the preferred method of routine 6.8.4 4-wire RTD reference '4rtd' calibration. It enables the BA374C transmitter to be This adjustment, which is only necessary if the adjusted using an external voltage, resistance or transmitter is used with a four wire resistance temperature calibrator. -
Page 18: Periodic Re-Calibration Using Trim Menu
To make the adjust- ment connect a calibrator to the transmitter input When calibrating the BA374C using the Trim Menu terminals to simulate minimum input, or place the both the zero and span must be adjusted. -
Page 19: Calibration Example
8. CALIBRATION EXAMPLE Step 5 Define units of display In this example a BA374C is required to display Using the Up or Down button select with maximum resolution the temperature of a type 'dEg', from the sub-menu and press P J thermocouple, and to transmit a 4/20mA signal to reveal the current units. - Page 20 The following steps explain how, using the Trim the 'ZEro' prompt. Menu, the BA374C transmitter may be calibrated This completes calibration at -10.0 against an external reference, such as a voltage source or temperature calibrator. Alternatively, the...
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Page 21: Maintenance
If a BA374C fails after it has been functioning correctly the procedure shown in section 9.1 should be followed. -
Page 22: Accessories
11.0 ALARMS Fig 11 Equivalent circuit of each alarm output The BA374C can be supplied with two solid state single pole alarm outputs. Each output may be programmed as a high or low alarm with a 11.1.2 Intrinsic safety... -
Page 23: Alarm Enable
11.1.3 Programming & adjustment See section 11.3.6 When an alarm card is added to a BA374C transmitter the Programme Menu is extended as 'SIL' Alarm silence time shown in Fig 13. - Page 24 Fig 13 Programme structure for optional alarms...
- Page 25 11.3 Description of programmable functions To check or change the alarm output status select 'no.nc' from the alarm sub-menu and press P The following sections contain detailed descrip- tions of each programmable function. They should reveal the current setting. The function can be changed by pressing the Up or Down button be read in conjunction with the programme struc- ture shown in Fig 13.
- Page 26 Each digit of the setpoint may be adjusted using display mode. the Up and Down push-buttons, and the P button Access to the alarm setpoint when the BA374C to move to the next digit. When the required transmitter is in the display mode is obtained by...
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Page 27: Backlight
12. BACKLIGHT BA374C supplied with backlighting to improve display contrast when the transmitter is installed in a poorly illuminated area. The backlight is segregated from the measuring circuit and has been certified as a separate intrinsically safe circuit. The backlight must be powered from the safe area via a Zener barrier or a galvanic isolator as shown in Fig 15.
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