In water treatment plants, pressure, liquid level and __________ are
the
most commonly measured variables?
Flow rates
A clear tube with a tapered bore containing a ball or float that is
used to
measure the flow rate of a gas or liquid is called what?
A rotometer
What type of flow measuring device requires little, if any,
preventive
maintenance since there are no moving parts?
Differential pressure devices
What is an electrical method for transmission of data, and it is used
when
the distance is quite far from the receiving station?
Telemetry
What is a common reason for malfunction of the instrument air supply
of a
pneumatic signal transmission system?
Water and oil in lines
A confined space has three components:
1. Is large enough and
configured that an employee can bodily enter and
perform
work;
2. has limited or restricted means of entry or
exit;
and what other condition?
Is not designed for continuous employee occupancy
What is the definition of precision?
The ability of an instrument to measure a process variable and
repeatedly
obtain the same result; the ability of an instrument
to reproduce the same
results
A confined space is found to contain a hazardous atmosphere and
inwardly
converging walls. These conditions render the confined space:
A permit-required confined space
Bourdon tube, bellows or diaphragm arrangments are all types of
what
measuring device?
Pressure sensors
The difference between the actual value and the desired value;
the
characteristic of proportional controllers that do not
incorporate reset action
(offset) is known as what?
Drift