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BEKA BA374NC Manual

Type nl certified field mounting indicating temperature transmitter
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BA374NC
Type nL certified
field mounting
indicating temperature
transmitter
Issue: 5
3rd December 2003

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Summary of Contents for BEKA BA374NC

  • Page 1 BA374NC Type nL certified field mounting indicating temperature transmitter Issue: 5 3rd December 2003...

  • Page 2: Table Of Contents

    6.8.1 Conditioning internal references 6.8.2 Voltage input reference 6.8.3 3-wire RTD reference 6.8.4 4-wire RTD reference 6.8.5 Output current reference The BA374NC is CE marked to show compliance with the European Explosive Atmospheres Directive 94/9/EC and the European EMC Directive 98/336/EEC...

  • Page 3: Controls

    You should only enter this section of the programme if you are sure that you want to carry out this calibration. By following the notes in this manual you should be able to set up your BA374NC without any problem. If you do run into difficulties however Section 9 (Maintenance) provides some guidance on typical problems you may find during commissioning.
  • Page 5 1. DESCRIPTION temperature is shown on the internal display. The 4/20mA output current is proportional to the The BA374NC is an Ex n certified 4/20mA loop displayed temperature. powered transmitter incorporating a large easy to read display. The instrument may be programmed...

  • Page 6: Type N Certification

    BS6941:1988. This verifies that in normal operation the BA374NC is This allows the BA374NC to be installed in Zone 2 not capable of igniting a surrounding explosive and to be used with most common industrial atmosphere, and a fault capable of causing ignition gases.

  • Page 7: Installation

    Fig 2 BA374NC powered from floating supply The sum of the maximum voltage drops of all the components in the loop must be less than the minimum power supply voltage. Fig 3 BA374NC installation procedure Minimum operating voltage of BA374NC10.0V...

  • Page 8: Emc

    Mount the enclosure on a flat surface and 6. PROGRAMMING AND CALIBRATION secure with screws or bolts through the four The BA374NC is programmed and calibrated via corner 'C' holes. Alternatively use one of the four push-buttons which are located behind the pipe or panel mounting kits described in enclosure cover.
  • Page 11 BA374NC indicators supplied calibrated as requested at the time of ordering. If calibration is not requested, the transmitter will have default calibration i.e.

  • Page 12: Summary Of Programme Menu Functions

    Cold junction compensation Thermocouple and resistance Turns thermocouple cold junction thermometer inputs compensation ON or OFF. The BA374NC transmitter will always display See section 6.3.4 sensor temperature. Programming allows the display to be in degrees Centigrade or Fahren- 'burn' Input open circuit drive...
  • Page 13 Other functions will reveal sub-menu from which, thermocouple and resistance thermometer inputs, the type of sensor may be selected and associated Display Summary of Programme Menu parameters programmed. functions 6.3 For thermocouple inputs 'CAL' Calibration of 4/20mA output This sub-menu defines the relationship 6.3.1 Type of thermocouple 'tYPE' between the transmitter 4/20mA output After selecting a thermocouple input, pressing P...

  • Page 14: For Resistance Thermometer Inputs

    * Worst case high resolution figures are 6.4.3 Display resolution 'rESn' quoted, at most temperatures resolution will The output of the resistance thermometer can be be greater. displayed with high or low resolution as shown below. Low resolution can improve the readability 6.3.4 Cold junction compensation 'CJC' of a noisy or rapidly changing display, but does not The temperature of the transmitter input terminals,...

  • Page 15: High Input & Display Calibration

    Note: If a complete loop including a primary input voltage. element, BA374NC 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: Calibrating The Internal References

    6.8.2 Voltage input reference 'U.IP' calibration of the instrument use the With the BA374NC input terminals connected to an accurate voltage calibrator, select 'U.IP' from the Trim Menu described in section 7. 'Cond' sub-menu and press P. The transmitter will...

  • Page 17: 4-Wire Rtd Reference

    7. TRIM MENU reference. The Trim Menu is the preferred method of routine calibration. It enables the BA374NC transmitter to 6.8.4 4-wire RTD reference '4rtd' be adjusted using an external voltage, resistance This adjustment, which is only necessary if the or temperature calibrator.

  • Page 18: Periodic Re-Calibration Using Trim Menu

    'Ent', allow the 4/20mA output current to be trimmed using the Up or Down push- If the BA374NC internal references are used to make frequent calibration changes, button.

  • Page 19: Calibration Example

    8. CALIBRATION EXAMPLE Step 5 Define units of display In this example a BA374NC 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 using the Up or Down button. When Menu, the BA374NC transmitter may be calibrated the output current measured by a DVM against an external reference, such as a voltage is 4.000mA, the E push-button should...

  • Page 21: Maintenance

    Before replacing instrument front cover ensure that the sealing gasket is undamaged and is free from dirt and foreign bodies. If a BA374NC fails after it has been functioning correctly, the procedure shown in section 9.1 should be followed.

  • Page 22: Accessories

    11.0 ALARMS The BA374NC can be supplied with two solid state Fig 9 Equivalent circuit of each alarm output single pole alarm outputs. Each output may be programmed as a high or low alarm with a normally open or a normally closed output.

  • Page 23: Alarm Enable

    See section 11.3.6 11.1.3 Programming & adjustment When an alarm card is added to a BA374NC 'SIL' Alarm silence time transmitter the Programme Menu is extended as Defines the time that the alarm output shown in Fig 11.
  • Page 24 Fig 11 Programme structure for optional alarms...
  • Page 25 P reveal the current setting. The function can be 11.3 Description of programmable functions changed by pressing the Up or Down button The following sections contain detailed descrip- followed by the E button to return the 'no.nc'' tions of each programmable function. They should prompt.
  • Page 26 E will return display mode. the display to the 'SP1' or 'SP2' prompt from which Access to the alarm setpoint when the BA374NC the other setpoint may be selected, or the transmit- transmitter is in the display mode is obtained by...

  • Page 27: Backlight

    12. BACKLIGHT BA374NC supplied with backlighting to improve display contrast when the transmitter is installed in a poorly illuminated area. The backlight is electrically segregated from the measuring circuit and has been certified as a separate EEx nL Group II, Category 3G circuit.

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