Flowmeter SVTU-11B, Operating Manual

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−
« 1_5_x » -
Т
Sx is below the tolerance. Measured temperature value is below permiss-
ible minimum (below -50 °C).
−
« 1_6_x » -
Т
Sx is over the tolerance. Measured temperature value is above permissi-
ble maximum (over +150 °C).
If
Т
S with an error is involved into flow rate measurement process, then all measure-
ments in the proper flow measurement channel would be canceled.
13.4 Error group « 2 ».
This group includes flow rate measurement errors referring to one of applied pair of
flow sensors (one of enabled chords for sound propagation).
−
« 2_1_x » - the error of flow sensors in beam «x». This error can be caused by follow-
ing reasons:
−
failure of flow sensors;
−
failure of flow sensors’ cable – breakdown or fault;
−
no water in FS.
13.5 Error group « 3 ».
This group includes errors referring to flow rate measurement. If multi-beam flow me-
ter is applied the error in measurement along one of sound paths not necessary leads to flow
measurement error of flow meter.
−
« 3_1_x » - measurement by FSx. Flow measurement in mentioned FS is impossible.
−
« 3_2_x » - temperature of FSx. Because of malfunction of TS, which measures tem-
perature in specified FS, a flow rate measurement is impossible. This error always takes
place with an error of measurement by TS. This error is displayed (and is brought in error
archive) to define interrelation between a temperature measurement error and a flow rate
measurement error.
−
« 3_3_x » - high velocity in FSx. The volumetric flow rate in mentioned FS exceeds
maximum value for this FS type more than twice.
13.6 Error group « 6 ».
−
This group includes the errors of pressure measurement (the sign «x» specifies num-
ber of the channel):
−
« 6_1_x » - PSx is below the tolerance. Measured pressure is below zero. It can be
caused by object conditions (underpressure), or with breakage of certain PS.
−
« 6_2_x » - PSx is over the tolerance. Measured pressure is above 20 kgf/
с
m
2
. It can
be explained by the fact of increased pressure on the object and faultiness of PS.
−
« 6_3_x » - PSx parameters are incorrect.
Pressure measurement errors don’t affect flow rate and temperature measurements.
In hourly and daily archive printouts there is a value of error appearance duration
(
Т
err). This value includes errors referred to flow measurement channel and errors, which
lead to impossibility of flow rate measurement. Errors of a flow meter and errors of tempera-
ture measurement are included here.
Printouts have a field ‘Error types’, in which presence of certain error type is displayed.
In total up to four various types of errors can be displayed within an hour and up to 8 types
of errors can be displayed within a day. The error is displayed on printout only if its duration
exceeds 1 minute.