BEKA BA374NC, Руководство пользователя

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c. Mount the enclosure on a flat surface and
secure with screws or bolts through the four
corner 'C' holes. Alternatively use one of the
pipe or panel mounting kits described in
sections 10.2 and 10.3.
d. Remove the temporary dust seals from the
cable entries and install the required glands,
conduit fittings or blanking plugs.
e. Connect the field wiring to the terminals as
shown in Fig 4.
f. Replace the transmitter assembly and evenly
tighten the three 'B' screws.
g. Replace the enclosure cover and evenly
tighten the four 'A' screws.
Fig 4 Dimensions and terminal connections
5.4 EMC
The BA374NC complies with the requirements of
the European EMC Directive. For specified
immunity all wiring should be in screened twisted
pairs.
6. PROGRAMMING AND CALIBRATION
The BA374NC is programmed and calibrated via
four push-buttons which are located behind the
enclosure cover. All the functions are contained
in two easy to use menus, the Programme Menu
and the Trim Menu, which are shown diagramati-
cally in Figs 5A, 5B and 7.
The Programme Menu contains all the transmitter
parameters and enables calibration to be
performed against the internal transmitter refer-
ences.
The Trim Menu enables the transmitter display and
the 4/20mA output current to be calibrated against
an external standard, such as a voltage source or
temperature calibrator. A complete loop may be
calibrated using this menu to minimise errors
resulting from primary element and load
inaccuracies.
Each function in the Programme Menu is summa-
rised in section 6.1 and includes a cross reference
to more detailed information in the following
sections. Although this simple menu driven
system enables most adjustments to be made
without repeated reference to this manual, we
recommend that the summary of the programme
menu, calibration procedure using the trim menu
and the calibration example in sections 6.1, 7.1
and 8 are read prior to changing function or
calibrating the transmitter. Figs 5A, 5B and 7 show
the structure of both menus.
Details of the Trim Menu are contained in section 7
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 11.
Throughout this manual push-buttons are shown in
italics e.g.
P or Up push-button, and legends
displayed by the indicator are shown within
inverted commas e.g. 'CAL' and ' ALr2'.
Access to the Programme Menu is obtained by
operating the
P and E push-buttons
simultaneously. If the transmitter is not protected
by a security code the first parameter 'InPut' will be
displayed. If the transmitter is protected by a
security code, 'COdE' will be displayed first.
Pressing
P again will enable the security code to
be entered digit by digit using the Up and Down
buttons to change the flashing digit, and the P
push-button to move to the next digit. If the
correct code is entered pressing
E will cause the
first parameter 'InPut' to be displayed. If an incor-
rect code is entered, or no button is pressed for ten
seconds, the transmitter will automatically return to
the operating mode.
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