DPTW User Manual, 1st Edition
User Manual - DPTW Differential Pressure Transmitter
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1. Preface
The personnel for installation, commissioning, diagnostics and maintenance must fulfill the
following requirements:
• Trained, qualified specialists must have a relevant qualification for this specific function
and task
• Are authorized by the plant owner/operator
• Are familiar with federal/national regulations
• Before beginning work, the specialist staff must have read and understood these
instructions
2. Overview
The ProSense DPTW differential pressure transmitter series is precision engineered for accurate
differential or gauge pressure measurement. The wet-wet design uses a silicon based variable
capacitance sensor with stainless steel media isolation diaphragms and silicone pressure
transmission fluid making it compatible with a wide variety of liquids, gases, and steam applied
to both pressure sensing ports. The DPTW series is ideal for industrial, commercial, and OEM
process measurement applications including differential, positive, or negative pressures;
hydrostatic liquid level in pressurized or open tanks; and flow measurement using primary
differential pressure flow elements such as an annular pitot tube, orifice plate or venturi tube.
The DPTW series is available in pressure measurement ranges from 4 inches water column up to
400 inches water column with static (line) proof pressure of 300 psig and can easily be rescaled
to a different linear pressure range and units of measure using display pushbuttons. An integral
square root function also allows for the display and output of flow in instantaneous flow rate units
of measure such as gallons/minute or display of integrated flow volume in units such as gallons.
The integral pressure port manifold has 1/4-inch NPT female process pressure connections and
includes a built-in equalizing valve used to open both ports to the line pressure during installation
to prevent sensor damage or calibration shift due to overpressure. The DPTW series is powered
with nominal 24VDC power and provides a two-wire, 4-20mA output signal proportional to the
measured pressure. The very compact design of the DPTW series is up to 8-times smaller than
conventional style DP transmitters and features a rugged NEMA 4X (IP65) rated aluminum die
cast housing and rotatable 6-digit LCD display with bright LED backlight.
3. Features
• Media Compatibility: Wetted materials consist of 316 stainless steel, alumina ceramic
and viton to handle a wide range of media with the ability to offer ranges as low as 4˝
W.C. F.S. (URL).
• Linear Scaling Function: The linear (scaling) function allows the user to adjust zero
and span values providing a corresponding 4-20mA output signal.
• Flow Measurement/Square Root Extraction Function: Momentary flow rate and
integrated volume can be displayed and analog signal can be output.
