Sensor Selection; Communication Interface - Elis SONOELIS SE404X Design, Assembly And Service Manual

Design, Assembly and Service Manual
Page 12 of 44
Ultrasonic flow meter SONOELIS SE404X,
SONOELIS SE406X
ELIS PLZEŇ a. s.

4.3. Sensor selection

The meter sensor shall be selected with respect to the fluid flow parameters at the measuring location. The
normal steady-state flow rate should be as close as possible to the q value (the rated flow rate) of the sensor
p
(see the table in section 4.1 above). Attention shall be also paid to the pressure loss value of the sensor which,
although it is generally very low, adds up to the total losses of the fluid piping, in particular at high flow velocities.
In applications where the standard sensor parameters do not meet the operational requirements, the values of q
s
and q of the selected sensor size can be re-set (in the COMFORT configuration using the customer control
min
push-button panel). The graph below shows the pressure loss values at various flow rates for particular sensor
sizes. It holds that the sensor parameter q is a fixed value in respect of the given measurement accuracy and
min
the sensor parameter q should not, for the given sensor size, exceed the maximum value given in the table in
s
section 4.1.
Pressure losses of ultrasonic sensors

4.4. Communication interface

All SONOELIS ultrasonic flow meters can be provided with isolated serial communication line RS 485. The
communication line parameters are: baud rate 4,800 Bd, 8-bit data format, one non-data bit, and optional parity
in both signal transmission directions. The communication protocol includes, among others, the measured and
processed fluid flow data such as instantaneous volume or mass flow rates, the total volume or mass of the fluid
flow, and the lengths of the periods of the meter operation, meter failure and power supply failure.
ELIS PLZEŇ a. s., Lucni 15, P. O. BOX 126, 304 26 Plzen, Czech Republic, Phone: +420/377517711, fax: +420/377517722
Es90201K/c