UNISYST ® Instrumentation & Process Control Systems ENGINEERING LTD Bulgaria, 1756 Sofia, Darvenitza, bl. 15, ent. G, fl. 1, tel. (+359) 2 8860 562, 2 8861 203, 2 8863 237;
The measuring ranges are defined during the flowmeter setting-up, depending on diaphragm calculations and the transducers used.
Electronic counters capacity:hourly: max. reading 999 999 nm3per shift and daily: max. reading 99 999 999 nm3monthly: max. reading 9 999 999 999 nm3total: max. reading 999 999 999 999 nm3Time counter capacity: 999 999 999 999 h. CF 300 SERIES CF 300 D MICROPROCESSOR GAS FLOWMETER
- Input channels measuring: < ±0,1%- Calculation of corrective factor: < ±0,15%Additional error due to fluctuations of ambient temperature:
Entered in the Bulgarian State Register of Licensed Measuring Instruments
Additional error due to supply voltage fluctuations: < ±0,05%. Sofia, 2007
The flowmeter takes into account the measured and calculated
CF 300 D MICROPROCESSOR GAS FLOWMETER
parameters and compares their values with the pre-set technological limits. In case any of these limits is reached, the unit generates an
FUNCTION AND USE
The CF 300 D flowmeter is intended for use in all branches of
The flowmeter is equipped with an alpha-numeric liquid cristal
industry where measuring of gas flow is required. The process of gas
display, a keyboard and two electro-mechanical counters. The unit
flow measuring is effected through the measuring of the pressure drop
memory stores the values of corrected and non-corrected flow for
on a diaphragm with subsequent automatic correction of the errors
the past 50 months, 50 days, 50 shifts and the past 200 hours, as
due to the influence of gas temperature and pressure (According to
well as the registered maximum values for an hour, shift, day and
the Method 949- 82 of the Chief Commission for Standardization).
The unit is manufactured in two modifications: CF 300 D1 and CF
The momentary gas flow value also comes out on an analog
300 D2, which differ in their construction only, the first being intended
for mounting on a panel and the second for mounting on a wall.
The in-built software of the flowmeter enables its setting,
The in-built RS232 interface enables the unit to be connected to a
calibration and testing. The input setting parameters are stored in
computer flow register system or to the specialized PU 300 printing
SPECIFICATIONS PRINCIPLE OF OPERATION
Input channels:4 galvanically separated analog inputs 4 - 20 mA with
The value of the gas volume flow when measured with a
an option for internal 24V DC supply for two-wire transducers.
diaphragm is proportional to the square root of the gas pressure drop
Optionally, CF 300 D is supplied with temperature inputs for direct
on the diaphragm and is influenced by the gas temperature, pressure
connection to thermoresistors Pt 100 (BSS or DIN 43760), Pt 46
The input parameters, necessary for the calculation of the gas
Momentary flow: galvanically separated analog output 0(4) - 20
mA with load resistance Rl < 500Ω.
External counters and alarm: relay outputs 48V/ 1A, normally
DP - pressure drop (input channel DP1 or DP2, depending on the
magnitude of the measured value and the preset measuring ranges of
According to the accepted Method 949-82 the measuring error
Monophase electric mains, grounded, 220V (187-242V)/50Hz.
increases with the decrease of flow to less than 30% of the max. value
for which the diaphragm has been calculated, and this corresponds to
9% of the max. pressure drop. The accuracy of measuring can be kept
96 x 96 x 180 mm CF 300 D1 and 213 x 180 x 100 CF 300 D2
high if two pressure-drop transmitters with different measuring ranges
are used, e.g. 1 : 10. In this case an error increase shall take place
only when the pressure drop comes below 0,81% of its max. value.
IP 54 for CF 300 D2 and IP 20 for CF 300 D1.
The calculation of the momentary flow is performed by the use of
formulae, recommended by the accepted Method 949-82, whereas
the DP channel is automatically selected by the unit, depending on the
Relative humidity: up to 80% at 25°CTime for initial setting: 30 min.
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