#2 TM Transmitters

Pressure, dP, Multi-Variable
Wide Range of Options

  • dP flow measurement or static pressure
  • Rosemount, ABB, Honeywell, Yokogawa and more brands available
  • In-house service and customization


The differential pressure transmitter reads the high and low pressure signals from the dP producing meter and turns that reading into a 4-20mA signal that can be read as flow or dP directly or transmitted to a PLC or SCADA system. That signal can be linear to the differential pressure, but more commonly is linear to flow by using the square root extraction in the transmitter. DP transmitters are highly accurate devices that can read differential pressures as low as 0.1”wc. They are ideally mounted as close to the dP producing meter as possible, but can be mounted further away as required. For dirty fluid applications or highly viscous fluids the use of seals and capillaries is required to prevent plugging of the lines.

There are various options for materials, indicators, electrical certifications, etc. They are also generally used with a 3-valve or 5-valve manifold that helps when performing set up operations like zeroing and can also make removal of the transmitter easier should it have to be replaced or worked on.

Multi variable transmitters can be used to compensate for changes in line temperatures and pressures generally associated with gas flow applications. This requires the use of an RTD mounted to the dP producing meter to measure and send the temperature to the transmitter.


Function Purpose
To measure the differential pressure (high vs low) produced by the dP meter and transmit that as a 4 – 20 mA signal. This signal can be either linear to differential pressure or with the square root function on, linear to flow.
Service Functional Limits
: DP transmitters can be used to measure any fluid that is flowing in the dP producing meter. Although some dirty or viscous fluids may require the use of seals with the transmitter to prevent clogging.
Water, Waste Water, Air, Steam, Oil, Viscous Liquids and gases
Common Materials
Stainless Steel
Other Available Materials
Hastelloy and Tantalum

Support and Service

In addition to a wide range of differential producing Venturi flow meters, orifice plates, WedgeType™ flow meters, and open channel flow elements, PFS provides comprehensive, specialized services for new and existing flow meters, including rehabilitation, hydraulic analysis, and full engineering support.


ISO 9001, ASME S&U, PED Certified, CRN.

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