pFlow D116-BTU (HD) Wall-Mounted Ultrasonic BTU Meter

Overview

The pFlow D116-BTU (HD) is a wall-mounted ultrasonic BTU (thermal energy) meter built on Gentos’ proven D116 transit-time flowmeter platform, purpose-engineered to add precise heat and cooling energy calculation to the same rugged, field-serviceable enclosure that has made the D116 family a mainstay of regional wall-mounted flow measurement. Unlike a standard clamp-on flowmeter that reports only volumetric flow, the D116-BTU pairs its ultrasonic flow sensor with a matched pair of PT1000 temperature sensors to continuously calculate the thermal energy transferred through a chilled-water or hot-water circuit, delivering both flow rate and BTU/kWh energy totals from a single wall-mounted transmitter.

As the official authorized partner and exclusive regional representative for pFlow Gentos, Seven Star LLC proudly supplies the D116-BTU (HD) to facility engineers, MEP contractors, and energy-management integrators across the Sultanate of Oman and the wider GCC. Every unit shipped through our regional warehouse network carries full manufacturer backing, and our instrumentation division supports selection, commissioning, and after-sales service for chilled-water plants, district cooling networks, and central utility installations throughout Muscat, Sohar, and Salalah.

Measurement Principle

The pFlow D116-BTU uses the ultrasonic transit-time method to determine liquid velocity: paired transducers, mounted externally on the pipe or in an insertion configuration, alternately transmit ultrasonic pulses upstream and downstream through the flowing liquid. The measurable difference in transit time between the two directions is directly proportional to the fluid’s velocity, which the transmitter converts into volumetric flow using the pipe’s programmed diameter, wall thickness, and material. Because the measurement is entirely non-invasive when configured with clamp-on transducers, there is no obstruction in the flow path, no pressure drop, and no wetted parts to foul, corrode, or wear — a decisive advantage over mechanical BTU meters in treated chilled-water loops.

Working alongside the flow measurement, a matched pair of PT1000 platinum resistance temperature sensors is installed at the supply and return points of the heat exchanger or coil. The transmitter’s onboard calculator continuously multiplies the measured flow rate by the temperature differential and the fluid’s specific heat capacity to derive real-time thermal energy transfer, displayed and totalized directly on the front-panel LCD in flow and net energy units. The practical result is a single instrument that eliminates the need for a separate flow transmitter, temperature transmitter, and BTU calculator, reducing installation complexity, wiring, and long-term maintenance points on the utility metering skid — a key reason engineers specify the pFlow D116-BTU on retrofit energy-metering projects.

Engineering Design of the pFlow D116-BTU

The pFlow D116-BTU transmitter is housed in the same rugged, wall-mountable enclosure as the rest of the D116 platform, with a sealed membrane keypad, backlit LCD display, and a stainless-steel and reinforced-composite housing designed to withstand plant-room and rooftop mechanical enclosures. Cable glands on the underside of the enclosure provide sealed entry for the ultrasonic transducer pair, the two PT1000 temperature probes, and the power/signal wiring, keeping the termination compartment protected from dust and moisture in accordance with its IP-rated construction.

Configuration is performed through the front keypad’s menu system, where pipe range, pipe material, pipe wall thickness, transducer spacing, and output signal type are entered through a user-friendly, British- and metric-unit menu. The transmitter supports both RS485 (Modbus) digital communication and 4-20mA analog output simultaneously, allowing direct integration into a Building Management System (BMS) or a standalone local display application without additional signal-conditioning hardware. Daily, monthly, and yearly totalized flow and energy values are retained in onboard memory for up to five years, along with power-on/off event logging, giving facility teams a complete energy-accounting trail without relying on an external data logger.

Key Features

The pFlow D116-BTU combines flow and thermal-energy measurement in a single field-proven wall-mounted package, with the following key capabilities:

• Combined ultrasonic flow and BTU/thermal energy measurement from a single wall-mounted transmitter, eliminating the need for a separate flow meter and heat calculator.
• PT1000 matched-pair temperature sensors deliver accurate supply/return temperature differential measurement for reliable energy totalization.
• Wide pipe size compatibility from DN25 to DN1200 (1″ to 48″), suitable for everything from branch risers to main chilled-water headers.
• IP68-rated transducers with cable runs extendable up to 305 m (1000 ft), supporting remote sensor placement in large mechanical rooms — a spec every pFlow D116-BTU ships with as standard.
• Simultaneous RS485 (Modbus) and 4-20mA outputs for direct BMS, SCADA, or PLC integration without added signal converters.
• User-friendly menu-driven setup for pipe range, pipe material, and wall thickness, with both British and metric measurement units available.
• Daily, monthly, and 5-year totalized flow and energy data retained onboard, with power on/off event logging for auditability.
• Parallel positive, negative, and net flow totalization with adjustable scale factor and 7-digit display for high-resolution reading.

Industrial Applications

The pFlow D116-BTU is widely applied across chilled-water and hot-water energy accounting projects where accurate, non-intrusive thermal energy measurement is required. In commercial and hospitality developments, it is used to sub-meter individual tenants or building blocks on a district cooling network, giving facility owners a fair and auditable basis for energy billing. In hospital complexes, pharmaceutical facilities, and semiconductor cleanrooms, it supports critical HVAC energy monitoring where process cooling loads must be tracked continuously for both operational efficiency and regulatory reporting.

As the officially authorized partner for pFlow Gentos, Seven Star LLC distributes the D116-BTU (HD) to MEP contractors and district cooling operators specifying the pFlow D116-BTU serving Oman’s growing built environment, including the Sohar and Salalah economic zones, where large-scale industrial and logistics facilities depend on accurate energy accounting to manage utility costs. The meter is equally suited to RO desalination plant utility rooms, large hotel chains seeking to benchmark energy consumption across properties, and university or government campus central utility plants that standardize on the pFlow D116-BTU that need dependable, field-serviceable BTU metering without the complexity of multi-component energy metering skids.

Technical Specifications

The table below summarizes the core specifications of the pFlow D116-BTU (HD) wall-mounted ultrasonic BTU meter, giving specifying engineers evaluating the pFlow D116-BTU a quick reference for pipe compatibility and output signal selection:

Request a Quote for pFlow D116-BTU

Facility engineers and MEP contractors in Oman and across the GCC can submit a formal RFQ for the pFlow D116-BTU (HD) ultrasonic BTU meter directly to Seven Star LLC. Units are supplied on request with lead time confirmed at quotation, and full technical datasheets are available on request for engineering submittals and BMS integration planning. As the authorized partner for pFlow Gentos in Oman and the GCC, our instrumentation division provides pre-sales technical selection support and after-sales technical support, helping every D116-BTU installation deliver accurate, auditable thermal energy accounting from day one. Contact Seven Star LLC today to request pricing, lead time, and technical documentation for your next pFlow D116-BTU chilled-water or district cooling metering project.

Browse the full pFlow range or see more Flowmeters products supplied by Seven Star LLC in Oman and the GCC.