BUF-311 flowmeter includes the Primary Converter and Secondary
Measuring Converter.
The Primary Converter (CP) is a specially designed measuring pipe
section with one factory-supplied pair of PEAs installed on it.
Secondary Measuring Converter (CS) includes Measurement and
Calculation board, which is responsible for electroacoustic sounding
control, primary and secondary processing of measurement results as
well as for their storing in the memory.
To provide data exchange with external devices, Measurement and
Calculation board is equipped with two Universal outputs and RS-485
output.
The graphic Liquid Crystal Display (LCD) makes visible measure-
ment data. The LCD displays alpha-numeric data in two lines (16 char-
acters per line). Displayed data is updated with use of the button lo-
cated near the LCD on the front panel.
1.4.3. Operating modes
1.4.3.1. The flowmeter operates in three modes:
- ADJUSTMENT – adjustment and calibration
- SERVICE – start-up procedures
- OPERATION – user mode.
The operating modes differ by level at which the user can access
certain data (transferred via RS-485 interface) and modify flowmeter's
configuration settings.
Maximum rights are granted in ADJUSTMENT mode. The mode al-
lows the user to modify all of the configuration settings. Minimum rights
are given in OPERATION mode.
The set of displayed parameters is the same in all operating mod-
es.
Flowmeter's work in different operating modes is controlled via RS-
485 interface.
1.4.3.2. Flowmeter's operating modes are set by placing (removing) jumpers on
J1 and J2 terminals, which are located on the board of Secondary Cal-
culation module.
Combinations of jumpers with regard to operating modes are speci-
fied in Table 3 ("+" means that the terminal contacts are closed by a
jumper, and "-" means that the terminal contacts are opened).
Table 3
Terminal
Mode
J1
J2
Mode description
OPERATION
-
-
Operation
SERVICE
-
+
Start-up procedures
ADJUSTMENT
+
-
Adjustment
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