VELTRON II
Air Monitor Corporation
116-011-98.P65 (8/30/10)
VELTRON II - IO&M Manual
1 – GENERAL INFORMATION
1.1 – DESCRIPTION
The VELTRON II is an ultra-low differential pressure "smart" transmitter designed to convert the low magnitude pressure
signals generated by airflow stations and probes, or static pressure sensors into dual transmitter output signals (4-
20mA, 0-5VDC or 0-10VDC) linear to pressure or flow.
Each VELTRON II is equipped with numerous standard features: A multi-line LCD used during configuration/calibration
and for display of process; AUTO-zero for elimination of transmitter zero error; user selectable primary signal noise filter,
input power isolation; capability of 10:1 flow or 100:1 pressure turndown; NEMA 1 enclosure, and a long list of construction
options.
1.2 – THEORY OF OPERATION
High and low pressure signals generated by airflow stations and probes, or static pressure sensors act upon opposite
sides of a flexible diaphragm within the transducer. The differential between the two pressure signals displaces the
diaphragm; the magnitude of the displacement being measured creates an electrical DC output from the transducer.
After undergoing A/D conversion, the resulting digital signal representing differential pressure or velocity pressure can
be "manipulated" within the microprocessor: square rooted for velocity or flow application; scaled for units of measure
and area for process outputs; filtered and scaled for local data display and utilized in performing a Special Function (see
Section 3 – Features). The built-in microprocessor runs the program that provides the following basic functions:
Timing, logic, and mathematical operations, analog input signal multiplexing, analog input/output calibration, digital
input (contact closure) detection, output relay operation, automatic zeroing valve operation, Operator Setup menu
system, display (LCD) indication, and individual LED indication.
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SECTION 1 – GENERAL INFORMATION
Summary of Contents for VELTRON II
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