Liquid Controls SP3850 - Manual (Page 8)

SP3850 Flow Computer
4
Setup Mode
The setup mode is password protected by means
of numeric operator and supervisor lock out codes
established by the user. In addition, a secret,
manufacturers numeric unlock entry sequence is
available.
The system also provides a minimum
implementation of an “audit trail” which tracks
significant setup changes to the unit. This feature
is increasingly being found of benefit to users or
simply required by Weights and Measurement
Officials in systems used in commerce, trade, or
“custody transfer” applications.
A software program is available which runs on a
PC using a RS-232 Serial for connection to the
Flow Computer. Illustrative examples may be
downloaded in this manner.
The setup mode has numerous subgrouping of
parameters needed for flow calculations. There is
a well conceived hierarchy to the setup parameter
list. Selections made at the beginning of the setup
affect offerings further down in the lists.
In the setup mode, the flow computer activates the
correct setup variables based on the instrument
configuration, the flow equation, and the hardware
selections made for the compensation transmitter
type, the flow transmitter type, and meter
enhancements (linearization) options selected. All
required setup parameters are enabled. All setup
parameters not required are suppressed.
A help line prompt is provided for each entry. In
addition a help message is available which may be
accessed by depressing the “HELP” key.
Also note that in the setup mode are parameter
selections which have preassigned industry
standard values. The unit will assume these values
unless they are modified by the user.
Most of the process input variables have available
a “default” or emergency value which must be
entered. These are the values that the unit assumes
when a malfunction is determined to have occurred
on the corresponding input.
It is possible to enter in a nominal constant value
for temperature, pressure or density, or analog
flow inputs by placing the desired nominal value
into both the lo and hi values. This is also a
convenience when performing bench top tests
without simulators.
Maintenance Mode:
The Maintenance Mode of the SP3850 is the Test
and Calibration Mode for the device. This mode
provides a number of specialized utilities required
for factory calibration, instrument checkout on start-
up, and periodic calibration documentation.
A supervisor password is required to gain access
to this specialized mode of operation. Normally
quality, calibration, and maintenance personnel will
find this mode of operation very useful. It is also
useful for factory testing.
Many of these tests may be used during start-up of
a new system. Inputs signals may be read, and
output signals may be exercised to verify the
electrical interconnects before the entire system is
put on line.
The following action items may be performed in
the Maintenance Mode:
Print Calibration/Maintenance Report
Examine Audit Trail
Perform Keypad Checkout
Perform Display Checkout
Perform Pulse Input Checkout
Perform Pulse Output Checkout
Perform Control Input Checkout
Perform Relay Output Checkout
Perform Analog Input Checkout
Perform Analog Output Checkout
Calibrate Analog Inputs using the Learn Feature
Calibrate Analog Output using the Learn Feature
Battery Check
Datalog Printing and Clearing
Note that a calibration of the analog input/output
will advance the audit trail counters since it effects
the accuracy of the system.
RS-232 Serial Port
The SP3850 has a general purpose RS-232 Port
which may be used for any one of the following
purposes:
Transaction Printing
Periodic Printing of Datalog
Print Internal Datalog
Remote Metering by Modem (optional)
Computer Communication Link
Configuration by Computer
Print System Setup
Print Calibration/Malfunction History
Remote Control
Instrument Setup by PC’s over Serial Port
A Diskette program is provided with the SP3850
that enables the user to rapidly configure the
SP3850 using a Personnel Computer. Included on
the diskette are common instrument applications
which may be used as a starting point for your
application. This permits the user to have an
excellent starting point and helps speed the user
through the instrument setup.