VELTRON DPT-
plus
Air Monitor Corporation
116-010-91.P65 (09/18/09)
VELTRON DPT-
plus
- IO&M Manual
2
SECTION 2 – PERFORMANCE SPECIFICATIONS
2 – PERFORMANCE SPECIFICATIONS
2.2 – INDICATION
Display
. A backlit, graphical LCD providing three lines of
data display. Also used for programming.
2.3 – INPUTS/OUTPUTS
Analog Inputs
. Differential pressure (high and low), and
4-20mA, 2-wire, internally or externally loop powered
temperature signal.
Analog Outputs
. Dual 4-20mA outputs, configurable as
internally powered/non-isolated, or externally powered/
isolated.
Digital Input
. Dry contact input for notification of AUTO-
purge start (from AUTO-purge panel).
Digital Outputs
. Dual Form A dry contacts rated for 3
amps at 24VAC/VDC for optional HI/LO alarm; or Form A
dry contacts for AUTO-purge acknowledgment.
Temperature Compensation Selection
. Pushbutton
selection of linearized or non-linear temperature transmitter
input for the following temperature sensing types:
Type E
–50 to 1750ºF
–50 to 950ºC
Type T
–50 to 750ºF
–50 to 400ºC
Type J
–50 to 2000ºF
–50 to 1090ºC
Type K
–50 to 2000ºF
–50 to 1090ºC
RTD
–50 to 1500ºF
–50 to 815ºC
2.4 – POWER
Power Supply
.
Standard 24VAC (20-28VAC) or 24VDC (20-32VDC).
Optional 120VAC (100-132VAC), via external
transformer.
Power Consumption
.
Standard: 8VA at 24VAC; 6VA at 24VDC; 36VA at
120VAC.
Circuit Protection
. Power input is fused and reverse
polarity protected.
2.1 – TRANSMITTER
Accuracy
. 0.1% of Natural Span, including hysteresis,
deadband, non-linearity, and non-repeatability.
Type
.
Differential pressure, flow, and mass flow.
Ranges
.
Natural Spans
Bi-Polar Natural Spans
0 to 25.00 IN w.c.
0 to 10.00 IN w
F±
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.
Span Rangeability
. The calibrated span can be down
ranged to 40% of the Natural Span.
Stability
. ±0.5% of Natural Span for six months.
Temperature Effect
.
Zero. None; corrected by AUTO-zero.
Span. 0.015% of Natural Span/ºF.
Mounting Position Effect
. None; corrected through
transmitter automatic zeroing.
Span and Zero Adjustment
. Digital, via internally
located pushbuttons.
Low Pass Filtration
. Response time to reach 98% of
a step change is adjustable from 2.0 to 250.0 seconds.
Max Zero Elevation and Suppression
. 100% of
Natural Span.
Overpressure and Static Pressure Limit
. 25 psig.
Automatic Zeroing
.
Accuracy. Within 0.1% of calibrated span.
Frequency. Every 1 to 24 hours on 1 hour intervals.
Temperature Limits
.
–20 to 180ºF Storage; +32 to 140ºF Operating.
Humidity Limits
. 0-95% RH, non-condensing.
