Teledyne ULTRAFLOW 150, Руководство по эксплуатации, Страница: 33 / 162

SECTION 5.0, TRANSDUCER INTERFACE ENCLOSURE
Buffer Board in the junction box assembly by a coax cable and three twisted,
shielded pair cable. The Flow Preamp/Driver Board has circuits to amplify the
transmit waveform, amplify the receive signal, apply a digital gain to the receive
signal, and bias the Electrostatic Transducer. Jumpers are provided to switch
between Electrostatic and Long Range Transducers. The purge switch signal is
passed directly through the preamp to the Flow Mother Board.
CAUTION : Care must be taken to insure that the jumpers are in the correct
position to avoid damage to the transducer.
5.2.5 (Optional) Dual Analog Input Board
The Dual Analog Input Board is an optional device intended to interface external
temperature and pressure signals into the system. This is necessary for monitors
that must correct the readings to standard conditions. The Dual Analog Input
Board can take three types of temperature inputs; RTD, 4-20
ma
current loop, or
DC voltage loop. It can take three types of barometric pressure signals; a custom
Teledyne Monitor Labs module, a 4-20
ma
current loop, or a DC voltage loop. The
board plugs into a connector on the bottom of the Flow Mother Board. The
information is transferred via Serial Peripheral Interface (SPI).
5.2.6 (Optional) Local User Interface Key Pad and Display Assembly
The optional Local User Interface (Standard on a 560DI) is designed as a basic
data display and mode command station for the operator when on the stack. It
does not have the ability to make parameter changes. It can only request data for
display and switch the monitor from one operational mode to another. (See
Section 4.2.2.)
The assembly has a six digit LED display and a ten-button key pad. There are
also four LED indicator lights for Fault, In Calibration, Path displayed and Power
on/off. The leftmost two digits of the display are green and indicate the bank and
the number of the parameter to be displayed. The parameters are grouped by
banks:
U ser bank (Table 5-3A), S ervice bank (Table 5-3B), and A uxiliary bank
(Table 5-3C). The following parameter tables and “Individual Button Function”
section define how to use the interface.
5-9