User’s & Technical Manual –
P/I LEVEL TRANSMITTER PIT7000
GELEC
Industrial Electronics
PAGE
24
11.
CALIBRATION PROCESS - DEFAULT SETTINGS
PIT7000 operating model involves
two critical levels (‘Low level’ & ‘High Level’) which
can be re-calibrated by the user
in order to meet the application requirements, as long as
the hydrostatic pressure they cause is within the sensor’s specified pressure range.
The
device configures the output linearization after each level calibration. The fluid level during
operation,
should be between ‘Low’ and ‘High’ l
evels in order to cause the relevant output
changes.
LOW LEVEL
‘Low Level’ is defined as the level where the PIT7000 provides the
minimum output value
of the selected output range
(for example 4mA, if the selected range is 4-20mA).
Unless otherwise stated on the product label,
PIT7000 is factory calibrated to provide
the minimum output when atmospheric pressure is applied to its pressure sensor.
In other words, when the bubble tube’s V
-notch is not submerged into fluid and the
provided air escapes freely from it.
HIGH LEVEL
‘High Level’ is defined as the level where the PIT7000 provides the
maximum output value
of the selected output range
(for example 20mA, if the selected range is 4-20mA).
Unless otherwise stated on the product label,
PIT7000 is factory calibrated to provide
the maximum output when full rated pressure is applied to its pressure sensor.
In other words, when the bubble tube’s V
-notch is submerged at a point with 10kPa (100cm
water) hydrostatic pressure for PIT7000-S1, or at a point with 50kPa (500cm water) for
PIT7000-S5.
Any modification of the calibration must be processed by an engineer familiar with
the device operation, the associated equipment and the application in general.
