5.3 Installation Procedure
a. Cut the specified aperture in the panel. To
achieve an IP66 seal between the instrument
enclosure and the instrument panel the
aperture must have the tighter tolerances
specified in Fig 4.
b. Slide the gasket over the body of the Rate
Totaliser before inserting the instrument into
the panel aperture.
c. Firstly ensure that all the panel mounting
clamps are closed by turning the knurled
screws fully anti clockwise until the two pips
in the clamp foot align with holes in the clamp
body.
d. Place a clamp in the recess on each side of
the Rate Totaliser, pulling gently to slide it
onto the dovetail as shown in Fig 5. Push
the knurled screw slightly forward to engage
the thread and tighten by turning clockwise
until it is just finger tight. When all four
clamps are fitted ensure that the gasket
behind the front panel bezel is correctly
positioned before fully tightening the clamps
to secure the instrument. The maximum
recommended clamp tightening torque is
22cNm (1.95 lbf in) which is approximately
equivalent to finger-tight plus one half turn.
Do not over tighten
.
e. Connect the panel wiring to the rear terminal
block(s) as shown in Figs 4. To simplify
installation, the terminals are removable so
that the panel wiring can be completed
before the instrument is installed.
Fig 5 Fitting panel mounting clamps
5.4 Scale card
The Rate Totaliser’s units of measurement are
shown on a printed scale card in a window at the
right hand side of the display. The scale card is
mounted on a flexible strip that is inserted into a
slot at the rear of the instrument as shown in Fig 6.
Thus the scale card can easily be changed without
removing the BA358E Rate Totaliser from the
panel or opening the instrument enclosure.
New instruments are supplied with a printed scale
card showing the requested units of measurement,
if this information is not supplied when the Rate
Totaliser is ordered a blank card will be fitted.
A pack of self-adhesive scale cards printed with
common units of measurement is available as an
accessory from BEKA associates. Custom printed
scale cards can also be supplied.
To change a scale card, unclip the protruding end
of the flexible strip by gently pushing it upwards
and pulling it out of the enclosure. Peel the
existing scale card from the flexible strip and
replace it with a new printed card, which should be
aligned as shown below. Do not fit a new scale
card on top of an existing card.
Install the new scale card by gently pushing the
flexible strip into the slot at the rear of the
instrument, when it reaches the internal end-stop
secure it by pushing the end of the flexible strip
downwards so that the tapered section is held by
the rear panel.
Align the self-adhesive
printed scale card onto the
flexible strip and insert the
strip into the Rate
Totaliser as shown below.
Fig 6 Inserting flexible strip carrying scale card
into slot at the rear of Rate Totaliser.
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