Liquid Controls SP2800 - Manual (Page 40)

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6-3 Removing the Case
To install or change the input or data interface
cards, the case must be removed. Remove
all power before opening the case. CMOS
logic is used so observe standard precautions
against damage by static discharge. On units
RS232 or RS422, two screws on the back,
holding the top left connector, have to be re-
moved. Next, remove the six (6) flat head
screws behind the front bezel and lift off the
bezel assembly. Slide the main board display
out the front of the case by pushing from the
rear. Once modifications are made, reverse
the procedure to reassemble the unit. Make
sure that the main board is in the track. The
six (6) screws that hold the panel must be
tight to seal the rubber keypad panel assem-
bly, approximately 0.6 in-lb torque.
6-3.1 Input Card Modification
Follow the instructions for removing the case
in Section 6-3. The Input card is mounted just
behind the display and plugs onto the 15 pin
post connector. Remove the board and make
desired changes. When installing the Input
card, make sure that the component side of
the board is facing the front and that the 15
pin connector is mated properly and not offset
to the side. Replace the front panel per Sec-
tion 6-3.
6-3.2 Serial Communications Interface Instal-
lation
Follow the instructions for removing the case
in Section 6-3. The RS232, RS422 and
RS422M cards have a 15 contact ribbon
cable that plugs into the female connector
next to the heat sink. Choose the proper In-
terface card. With components on top and
subminiature connector to the back plug in
the harness and mount the card on the four
(4) standoffs provided. After the main board
is inserted into the case replace the front
panel as per Section 6-3.
6-4 Maintenance
The Batcher does not require any "Routine
Maintenance" by the user. If a problem
should occur, and all troubleshooting proce-
dures have been exhausted, contact your lo-
cal representative or distributor (phone num-
ber on cover of manual).
SECTION 7 CALCULATING THE K FACTORS
7-1 General
The key to accurate flow measurement with
the Batcher is correct scaling. The electronics
of the unit have been designed for stability
and repeatability. Even the finest measuring
device and equipment cannot make up for im-
proper factoring and programming. Due to
the complexity of the concept of K Factors,
this special section has been provided for
those who still find it hard to understand. A
separate worksheet has also been provided
with this manual to help in calculating the K
Factors. It is hoped, that between this section
of the manual and the worksheet, that any
questions you may have, regarding the K Fac-
tor, will be answered.
7-1.1 What is a K Factor?
The K Factor is a divider. This means that if
the K Factor is greater than 1, it will diminish
any input signal. Conversely, if it is less than
1, it will increase any input signal. The K
Factor range of the Batcher is from 0.0001001
to 99999999. This allows a wide range of
factoring from greatly increasing (to display a
large value) to decreasing the input (to display
a very small value).