Universal Ultrasonic Flow Meter (DN25–DN5000)
±0.5 % Across Inline, Wall-Mount, and BTU Versions
Transit-time, 0.5 to 5 m/s, repeatability 0.15 %
24 V DC, 5 W. IP54 transmitter, IP68 wetted transducer
Modbus RTU, 4-20 mA, OCT pulse, relay
- Extended DN range to DN5000 covers trunk lines beyond where the Standard Inline (DN15–DN1200, see Related) tops out.
- W8 split-body wall-mount puts the transmitter up to 200 m from a hot or vibrating line.
- Optional PT100 supply + return pair turns the body into a kWh / MJ / BTU heat meter.
The Universal Ultrasonic Flow Meter is a single-path transit-time instrument for liquid service, DN25 to DN5000. A transducer pair times the upstream and downstream transit difference along a single path; the firmware returns volumetric flow at ±0.5 % of reading. C8 integral inline or W8 split-body wall-mount. Optional PT100 pair for kWh / MJ / BTU output. Modbus RTU, 4-20 mA, OCT pulse. 24 V DC. 5–7 business days from the factory.
Benefits
- DN range to DN5000; past where the standard inline tops out. Covers utility trunk and primary-distribution lines that integral wafer / flanged bodies cannot reach. Same ±0.5 % accuracy holds across the full range.
- ±0.5 % at 0.5 to 5 m/s, repeatability 0.15 %. Linearity ±0.5 %, response 500 ms. Single-path transit-time without the multi-path price.
- Inline or wall-mount split-body; same model. C8 integral body for clean plant-room runs; W8 split-body puts the transmitter on the wall up to 200 m away on hot or vibrating lines. Pick at order.
- Optional PT100 pair returns kWh / MJ / BTU. Same transmitter, two PT100 inputs, on-board calorimetry. Suits trunk-line district-heat substation and large-bore HVAC.
- 24 V DC industrial bus, 5 W. Modbus RTU + 4-20 mA + OCT pulse + relay. IP54 transmitter, IP68 wetted transducer. Pre-configured slave address ships with each meter.
Configure your build.
Build a model code from DN, install style, BTU option, output, and power. Send the code with the application and upstream-pipe context. Engineering replies with a sized quote within one business day.
Your configuration
PF-UFM-U8-DN1500-C8-FLOW-STD-MOD-DC
DN1500 trunk-line (sweet spot), C8 integral inline, flow-only (no PT100 pair), standard medium-temperature (-40 to +80 deg C), RS-485 Modbus RTU + 4-20 mA + OCT pulse, 24 V DC.
Estimated unit price
$ 3,400
Request engineering quote
Request datasheet
Applications
🏭
Trunk-line process metering
Refinery utility crossover, cement / steel plant trunk distribution, hyperscale cooling-water primary. DN1500 to DN5000 lines where standard inline DN1200 tops out.
🔧
Wall-mount panel integration
W8 split-body keeps the transmitter up to 200 m from a hot or vibrating line, on a cool wall.
⚡
24 V DC plant bus retrofit
Existing turbine or EMF replacement on a 24 V DC plant bus. this model ties in without running AC mains to the meter.
🔥
District-heat trunk (with BTU)
Trunk-line substation primary entry with the optional PT100 pair. Same body returns kWh / MJ / BTU on Modbus. Suits 40 to 90 K delta-T.
Full specifications.
| Measurement principle | Single-path transit-time ultrasonic; one acoustic path between a transducer pair; firmware times the upstream and downstream transit difference |
|---|---|
| Channels | 1 acoustic path |
| Nominal diameter | DN25 to DN5000 |
| Accuracy | ±0.5 % of reading at velocity 0.5 to 5 m/s |
| Linearity | ±0.5 % |
| Repeatability | 0.15 % |
| Velocity range | 0.1 to 12 m/s operating; accuracy spec ±0.5 % within 0.5 to 5 m/s |
| Response time | 500 ms |
| Install style | C8 integral inline body (transmitter on the flow body) OR W8 split-body wall-mount (transducer set on the line, remote transmitter on the wall up to 200 m away) |
| Optional BTU pair | PT100 supply + return pair; on-board firmware solves E = integral of (m-dot x Cp x delta-T) dt; output kWh / MJ / BTU selectable |
| Output; analog | 4-20 mA, max load 600 ohm |
| Output; digital | RS-485 Modbus RTU |
| Output; other | OCT pulse + high / low alarm; relay 30 V DC at 1 A, switching frequency under 2 Hz |
| Power | 24 V DC, 5 W |
| Display | LCD 2.8-inch IPS, 320 × 240 resolution, 4-direction rotation; unit selection m³/h, LPM, mL/min, GPM, LPH |
| Medium | Single-phase liquid, 100 % pipe-fill; water, aqueous solution, chemical reagent; suspended solids 4 % or less |
| Medium temperature | −40 to +80 deg C (sensor head) |
| Ambient temperature | −40 to +60 deg C transmitter; −40 to +80 deg C sensor head |
| Ingress protection | IP54 transmitter housing; IP68 wetted transducer head |
| Process connection | Flange ANSI B16.5 / EN 1092-1 / GB/T 9119 (specify at order) |
| Hazardous area | Not declared on this model; route Ex-classified service to clamp-on or insertion ultrasonic model with CNEX Ex d IIC certificate |
| Compliance ships standard | Calibration record with each meter (serial number + tested flow range); notified-body custody-transfer certificate is buyer-arranged with the local metrology authority |
| Lead time | 5–7 business days from factory |
Installation rules.
Single-path needs more straight-pipe than multi-path. Five rules.
- 10D upstream, 5D downstream straight-pipe. Single-path reads asymmetric profile as bias; hold 20D after pumps. Short straight-pipe? Go to M2 or M4.
- Mount the transducer pair at 12 and 6 o’clock on horizontal lines. Top-and-bottom keeps both transducers wetted and avoids air-pocket bias at the crown.
- Pipe must stay 100 % liquid-filled. Air pockets falsify the transit-time signal. Closed loops need an air vent upstream on the loop high point.
- Mount W8 transmitter on a stable wall, −40 to +60 deg C ambient. IP54 housing; plant room, not outdoor submerged service.
- Configure register map and slave address at commissioning. Factory pre-configures from BMS or DCS spec. Record both in the commissioning log.
Frequently asked questions
How does a single-path transit-time ultrasonic flow meter work?+
A transducer pair sits on opposite sides of the pipe at a fixed angle. Each transducer alternates as transmitter and receiver, firing acoustic pulses upstream and downstream along the same path. The pulse traveling with the flow arrives faster; the pulse against the flow arrives slower. The firmware times the transit difference and returns line velocity, which multiplied by the cross-section area gives volumetric flow.
When is this meter the right pick vs the Standard Inline?+
Three reasons. First, DN range. This meter covers DN25 to DN5000; its unique fit vs the Standard Inline starts above DN1200 where the Standard Inline tops out. Below DN1200, both meters work; the Standard Inline is the simpler integral choice. Second, install style. This meter ships with a W8 split-body version; transducer on the line, remote transmitter on the wall up to 200 m away; for hot, vibrating, or panel-room installs. The Standard Inline is integral only. Third, power. This meter runs 24 V DC industrial bus only, where the Standard Inline takes AC mains as well. Pick this meter when DN exceeds 1200, when wall-mount is required, or when 24 V DC is the plant bus.
What is the straight-pipe rule?+
10D upstream, 5D downstream as the working rule for single-path. After a pump or a double elbow out-of-plane, hold 20D upstream. A single-path meter sees the upstream profile asymmetry as a bias; if the install cannot hold 10D, go to the 2-path averaging model (5D/3D footprint) or the 4-path model (severe-disturbance tolerance).
Can the same body meter heat energy as well as flow?+
Yes, with the optional PT100 supply + return pair. The transmitter accepts two PT100 inputs and runs the BTU calorimetry firmware that solves E = ∫(ṃ × Cp × ΔT) dt. Output is selectable between kWh, MJ, and BTU on the display and on the 4-20 mA energy-rate channel. Suits trunk-line district-heat substations and large-bore HVAC. Specify with-BTU at order.
What ships in the package and what is the lead time?+
The package ships with the flow body (C8) or transducer set (W8), the transmitter, signal cable (length factory-set per order), the calibration record (serial number, tested flow range), and a pre-configured Modbus register map and slave address. Optional PT100 BTU pair adds two temperature sensors plus coupling paste and stainless straps. Lead time is 5 to 7 business days from the factory. Notified-body custody-transfer certificates are buyer-arranged with the local metrology authority.
Need help spec’ing the single-path meter?
Send DN, service liquid, upstream pipe geometry, install style, and BTU option. Sized quote within one business day. Lead time 5–7 business days.