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BGX501-806-R02, Censeo User Manual
Page 9 of 20
Figure 5: Decal and Front Plate of Censeo
4.
Buttons:
A keypad containing four orthogonal buttons is available for various functions.
5.
Mounting Holes:
Four mounting holes are available at the rear corners of the meter casing to mount the
Censeo on a wall.
6.
Clamp screw:
These screws are used to fasten side mounting clamps for panel installation. This will
arrest the horizontal movement of Censeo through the panel while installation.
7.
Bottom glands:
These glands are basically an entry for the supply and communication cables at the
bottom of the Censeo.
8.
Side mounting clamp:
A couple of side mounting clamps are available to mount the Censeo on a panel.
9.
Pressure and temperature sensor terminals:
These terminals are used to connect four types of sensor
inputs – suction/ inlet pressure, discharge/ outlet pressure, suction/ inlet temperature and discharge/
outlet temperature.
10.
RS485 PC communication terminals:
These terminals are used for communicating continuously with a
computer for real-time pump/ hydro-turbine/ blower monitoring, flow and efficiency calculations.
11.
Relay terminals:
These outputs from relays inside Censeo are used to drive external alarm / control
circuits towards various purposes. The relays retain their state until driven again by Censeo, or the next
power cycle.
12.
Power supply terminals:
These terminals are used to power up the Censeo with a single phase AC or
DC supply.
13.
RS485 power meter communication terminals:
These terminals are used to feed real-time RS485 inputs
from external electronic wattmeters or power meters which measure the power drawn/ generated by the
pump/ hydro-turbine/ blower in real time.
14.
Terminals for analogue inputs / outputs:
If available, these terminals are used to either feed extra
signals from sensors or to transmit extra signals outside from the Censeo.
5
Firmware Features
5.1 Principle of Operation
Censeo employs the thermodynamic method of calculating work done on the pumped fluid by measuring
differences between temperature and pressure at suction/ inlet and discharge/ outlet ends through highly
precise temperature probes and pressure transducers. The efficiency calculation done by this method is based
on calculating losses. In a typical pump/ hydro-turbine system the main losses occur are temperature rise,
noise, vibration. Almost 98% of losses constitute the temperature rise.
While pumping/ rotating any fluid, mechanical work is done on the liquid which raises its temperature
measurably. Moreover, because of the significant mechanical effort applied on the fluid, discharge/ outlet
pressure is always slightly higher than the suction/ inlet pressure (this is inverse for hydro-turbine however).
Thus, a little energy is dissipated as heat which gets absorbed by the fluid and mechanical vibrations of the
pump/ hydro-turbine setup.
Through highly precise electronic probes and transducers, it is possible to measure such differential changes in
temperature and pressure. Once accurate numerical data is available, actual losses in the system can be
calculated using thermodynamic equations. When input/ output electrical power to/ from the motor/ generator
