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12. BACKLIGHT

To improve display contrast the BA578C can be
supplied with LED backlighting to improve display
contrast when the transmitter is installed in a poorly
illuminated area. The backlight is segregated from
the measuring circuit and may be powered from
any 18 to 30V dc supply.

Fig 13 Backlight power supply

The brilliance of the display backlight may be
reduced by decreasing the supply voltage below
18V, or by adding a current limiting resistor in
series with the supply

.

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Содержание BA578C

Страница 1: ...Issue 4 26th September 2008 BA578C panel mounting indicating temperature transmitter issue 4...

Страница 2: ...eferences 5 8 1 Conditioning internal references 5 8 2 Voltage input reference 5 8 3 3 wire RTD reference 5 8 4 4 wire RTD reference 5 8 5 Output current reference 6 Trim Menu 6 1 Calibration procedur...

Страница 3: ...ions of Section 5 you will find information on setting up for Section 6 3 Themocouple input Section 6 4 Resistance thermometer input Section 6 5 Voltage input A word of warning Section 5 8 explains ho...

Страница 4: ...the 4 20mA output current The transmitter and the optional alarms are powered from the 4 20mA current loop but the optional display backlight requires a separate supply Each time power is applied to...

Страница 5: ...sed in a robust aluminium enclosure with a polyester front panel and Noryl bezel The front panel provides IP65 protection and a gasket seals the joint between the instrument and the panel The transmit...

Страница 6: ...are contained in section 6 which also describes periodic calibration When the transmitter is fitted with alarms additional functions are added to the programme menu These are described in section 10...

Страница 7: ...value Each of the functions in the Programme Menu is described in the following summary with a cross reference to more detailed information Figs 5A and 5B illustrate the location of each function wit...

Страница 8: ...8...

Страница 9: ...9...

Страница 10: ...st be entered to gain access to the programme and the trim menus Default code 0000 disables the security function and allows unrestricted access to all functions in the programme and trim menus See se...

Страница 11: ...to the sub menu 5 3 5 Input open circuit drive burn If the thermocouple fails and becomes open circuit the transmitter can be conditioned to drive the display and the 4 20mA output current up or down...

Страница 12: ...xt digit When the least significant digit has been adjusted press E to return to the dISP prompt 5 5 3 High input display calibration In HI This function defines the higher voltage input and the corre...

Страница 13: ...ned to the display mode If the security code is lost access to the Programme and Trim Menus can be obtained by putting the internal security link in the override position see Fig 6 The security code c...

Страница 14: ...mitters may be calibrated in a workshop Select 3rtd from the Cond sub menu and press P The transmitter will display scrolling decimal points while the reference is being updated followed by Ent prior...

Страница 15: ...ly trimmed at the bottom of the input range To make the adjust ment connect a calibrator to the transmitter input terminals to simulate minimum input or place the primary element in a vessel at the mi...

Страница 16: ...se to full scale The current security code is 1209 The example is divided into two sections Steps 1 to 10 explain how to condition the transmitter and to calibrate the 4 20mA output using the internal...

Страница 17: ...may be calibrated by cooling and heating the thermocouple to 10 and 240o C This is the preferred method for routine calibration Step 11 Entering the trim menu Enter the trim menu by simultaneously pr...

Страница 18: ...display mode 8 MAINTENANCE 8 1 Fault finding during commissioning If the BA578C transmitter fails to function during commissioning the following procedure should be followed Symptom Cause Solution No...

Страница 19: ...any instrument which fails We recommend that suspect instruments are returned to BEKA associates or our local agent for repair 8 4 Guarantee Transmitters which fail within the guarantee period should...

Страница 20: ...with a thermally printed tag strip on the rear panel with any legend containing up to 35 alphanumeric characters This strip is not visible from the front of the instrument after installation 10 ALARM...

Страница 21: ...alarm parameters See section 10 3 1 SP1 Alarm setpoint 1 Adjusts the alarm setpoint The alarm is activated when the indicator display equals the setpoint The setpoint can also be adjusted directly fro...

Страница 22: ...22 Fig 11 Programme structure for optional alarms...

Страница 23: ...ut status select no nc from the alarm sub menu and press P to reveal the current setting The function may be changed by pressing the Up or Down buttons followed by the E button to return the no nc pro...

Страница 24: ...AcSP prompt in the Programme Menu Code 0000 will disable the security code allowing direct access to the setpoints by pressing the P and Up buttons simultaneously New instruments are supplied with thi...

Страница 25: ...installed in a poorly illuminated area The backlight is segregated from the measuring circuit and may be powered from any 18 to 30V dc supply Fig 13 Backlight power supply The brilliance of the displ...

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