Air Monitor Corporation Veltron DPT 2500-plus User manual

VELTRON DPT 2500-plus
Microprocessor Based
Ultra-Low Differential Pressure and Flow Transmitter
NEW
0.25% ACCURACY
Accurate airflow measurement for demanding applications

The VELTRON DPT 2500-plus transmitter is furnished with an
automatic zeroing circuit capable of electronically adjusting the
transmitter zero at predetermined time intervals while
simultaneously holding the transmitter output signal.
The automatic zeroing circuit eliminates all output signal drift due
to thermal, electronic or mechanical effects, as well as the need for
initial or periodic transmitter zeroing. For transmitters operating
in a moderately steady temperature location (thus no thermally
induced span drift), this automatic zeroing function essentially
produces a "self-calibrating" transmitter. The automatic zeroing
circuit will re-zero the transmitter to within 0.1% of its operating
span; for a transmitter with a 0.02 IN w.c. operating span, this
represents a zeroing capability within 0.00002 IN w.c.
To permit manual calibration of the VELTRON DPT 2500-plus,
an electronic switch is provided to permit manual positioning of
the zeroing valve.
with Automatic Zeroing Circuit
VELTRON DPT 2500-plus
Low Pass Filtration.
Response time to reach 98% of a step change is adjustable
from 0.5 to 250.0 seconds.
Max Zero Elevation.
100% of Natural Full Span. Requires bi-polar transducer.
Max Zero Suppression.
50% of Natural Full Span. Requires bi-polar transducer.
Overpressure and Static Pressure Limit.
25 psig.
Temperature Limits.
–20 to 180⁰F Storage; +40 to 140⁰F Operating.
Humidity Limits.
0-95% RH, non-condensing.
Display.
Backlit, graphical LCD providing single line of data
display.
Analog Output.
Single transmitter output individually configurable via
jumpers for 0-5VDC, 0-10VDC, or 4-20mADC.
Power Supply.
24VAC (16-28VAC) or 24VDC (16-40VDC).
Power Consumption.
8VA at 24VAC; 6VA at 24VDC.
Circuit Protection.
Power input is isolated, fused, and reverse polarity
protected.
Transmitter
Ranges.Natural Spans Bi-Polar Natural Spans
0 to 25.00 IN w.c.
0 to 10.00 IN w.c. –10.00 to 10.00 IN w.c.
0 to 5.00 IN w.c. – 5.00 to 5.00 IN w.c.
0 to 2.00 IN w.c. – 2.00 to 2.00 IN w.c.
0 to 1.00 IN w.c. – 1.00 to 3.00 IN w.c.
0 to 0.50 IN w.c. – 0.50 to 0.50 IN w.c.
0 to 0.25 IN w.c. – 0.25 to 0.25 IN w.c.
0 to 0.10 IN w.c. – 0.10 to 0.10 IN w.c.
0 to 0.05 IN w.c. – 0.05 to 0.05 IN w.c.
Accuracy.
0.25% of Natural Span, including non-linearity, hysteresis,
deadband, and non-repeatability.
Span Rangeability.
The calibrated span can be down ranged to 40% of the
Natural Span.
Stability.
±0.5% of Natural Span for six months.
Transducer Response Time.
0.5 second to reach 98% of a step change.
Temperature Effect.
Zero. None; corrected by AUTO-zero.
Span. 0.015% of Full Span/⁰F.
Mounting Position Effect.
None; corrected by AUTO-zero.
Span and Zero Adjustment.
Digital, via internally located push-buttons.
Automatic Zeroing.
Accuracy. Within 0.1% of calibrated span.
Frequency. Every 1 to 24 hours on 1 hour intervals.
Performance Specifications

Construction Features
Ultra-Low Differential Pressure & Flow Transmitter
Accuracy. The VELTRON DPT 2500-plus is designed to maintain
an accuracy of 0.25% of Natural Span. For a span of 0 to 0.05 IN
w.c., this accuracy is equivalent to an output accuracy of ±0.000125
IN w.c. differential pressure or ±0.1.12 FPM velocity at span.
Continuous Display of Process. The VELTRON DPT 2500-plus
is equipped with a backlit, graphical LCD for use during the
configuration and calibration process, and to display the transmitter
output during normal operating mode. During normal operation,
the LCD displays the transmitter output with 0.45 inch high
characters.
Analog Communication. Output signal can be individually
configured for 0-5VDC, 0-10VDC, or 4-20mADC by means of
jumpers.
ElectronicRespanning. The VELTRON DPT 2500-plus operating
span can be electronically selected anywhere between the Natural
Span and 40% of Natural Span, without having to perform
recalibration involving an external pressure source.
Primary Signal Noise Filter. To eliminate background noise and
pulsations from the flow signal, the VELTRON DPT 2500-plus is
equipped with a user selectable digital low pass filter.
Features
MicroprocessorBasedFunctionality. The VELTRON DPT 2500-
plus' on-board microprocessor performs the functions of operating
parameter selection, transmitter configuration, input/output and
display signal scaling, and transducer calibration.
High Turndown Ratio Operation. The VELTRON DPT 2500-
plus, with its high level of accuracy and automatic zeroing circuitry,
can maintain linear output signals on applications requiring velocity
turndown of 10 to 1.
Multiple Operating Power Selections. Standard input power
supplied to the VELTRON DPT 2500-plus can be either 24VAC or
24VDC via automatic selection.
Enclosure. The VELTRON DPT 2500-plus is furnished in a
NEMA 1 aluminum enclosure with internal wire terminations. For
harsh environments, the VELTRON DPT 2500-plus is available
with a NEMA 12 steel enclosure with bulkhead signal connection
fittings, quick release latch, conduit connection port, and internal
tubing, wiring, and terminal strip. The enclosure is also furnished
with an oil-resistant gasket and integral mounting plate.
¹/₈" FPT Signal
Connections
¹/₈" FPT Signal
Connections
VELTRON DPT 2500-plus – NEMA 12 VELTRON DPT 2500-plus – NEMA 1
NEMA 12 Enclosure NEMA 1 Enclosure
Graphical
LCD

Signal Connections.
High and low pressure, ¹/₈" FPT.
Electrical Connections.
Internal terminals.
Physical Specifications
Enclosure.
NEMA 1 aluminum enclosure. NEMA 4 & 12 optional.
Weight.
4.1 lbs.
125-193(8/04)
VELTRON DPT 2500-plus
Dimensional Specifications
Suggested Specification
The transmitter shall be capable of receiving flow signals (total
and static pressure) from an airflow station or probe array and
produce an output linear and scaled for air volume, velocity,
differential pressure, etc.
The transmitter shall contain an integral multi-line digital display
for use during the configuration and calibration process, and to
display one transmitter output during normal operating mode. All
transmitter configuration, parameter setting, zero and span
calibration, plus display formatting and scaling will be performed
digitally in the on-board microprocessor via input pushbuttons.
The transmitter will be available in multiple natural spans covering
the range of 0.05 IN w.c. to 25.0 IN w.c. with an accuracy of 0.25%
of natural span. The transmitter shall be furnished with a transducer
automatic zeroing circuit and be capable of maintaining linear
output signals on applications requiring 10 to 1 velocity turndown.
The transmitter shall be the VELTRON DPT 2500-plus as
manufactured by Air Monitor Corporation, Santa Rosa, California.
P.O. Box 6358 • Santa Rosa, CA 95406 • TEL 800-AIRFLOW • Fax [phone] • www.airmonitor.com
VELTRON DPT 2500-plus – NEMA 1 VELTRON DPT 2500-plus – NEMA 12
VELTRON DPT 2500-plus
Pressure and Flow Transmitter
VELTRON DPT 2500-plus
Pressure and Flow Transmitter