Universal Ultrasonic Flow Meter (DN25–DN2000)
Inline ±0.5 % · Wall-Mount and BTU ±1.0 %
Transit-time, 0.5 to 5 m/s, response 500 ms
24 V DC, 5 W. IP54 transmitter, IP68 wetted transducer
Modbus RTU, 4-20 mA, OCT pulse, relay
- Plant-scale inline meter; about 25 % below the wider-range (DN25–DN5000) model at the same DN.
- W8 split-body version puts the transmitter on the wall up to 200 m from the line.
- LCD 2.8-inch with 4-direction rotation; reads m³/h, LPM, mL/min, GPM, LPH.
The Universal Ultrasonic Flow Meter is a single-path transit-time instrument for liquid service, DN25 to DN2000. A transducer pair times the upstream and downstream transit difference along a single path. Inline non-BTU configuration delivers ±0.5 % at 0.5 to 5 m/s; the W8 wall-mount and PT100 BTU versions are ±1.0 %. Modbus RTU, 4-20 mA, OCT pulse, relay. 24 V DC. 5–7 business days from the factory.
Benefits
- Inline ±0.5 % at 0.5 to 5 m/s. The C8 integral inline configuration holds the same accuracy as the DN25–DN5000 model on lines up to DN2000, at about 25 % lower price.
- Wall-mount and BTU versions ±1.0 %. W8 split-body and PT100 BTU versions step accuracy to ±1.0 %; honest spec, surfaced in the configurator. Need ±0.5 % on wall-mount or BTU? Go to the DN25–DN5000 model.
- DN25 to DN2000; covers most plant inline. Covers cooling-water primary, chilled-water, glycol-water blends, chemical reagent dosing. Lines above DN2000 go to the DN25–DN5000 model.
- LCD 2.8-inch display, 4-direction rotation. Reads m³/h, LPM, mL/min, GPM, LPH. Mount the transmitter any orientation; display rotates to match.
- 24 V DC industrial bus, 5 W. Modbus RTU + 4-20 mA + OCT pulse + relay. Pre-configured slave address. IP54 transmitter, IP68 wetted transducer.
Configure your build.
Build a model code from DN, install style, BTU option, output, and power. Accuracy updates with config; inline non-BTU is ±0.5 %; wall-mount or BTU steps to ±1.0 %.
Your configuration
PF-UFM-U7-DN100-C8-FLOW-STD-MOD-DC
Accuracy: ±0.5 % (C8 inline, no BTU)
DN100 commercial / HVAC primary, 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
$ 1,600
Request engineering quote
Request datasheet
Applications
🏭
Plant cooling + chilled water
DN50 to DN800 cooling-water primary, chilled-water loops, condenser return. C8 inline at ±0.5 % covers most industrial plant rooms below DN2000.
🔧
OEM skid integration
White-label skid spec calls for ±0.5 % inline at DN25 to DN2000. This is the base model; configurator returns a sized quote within one business day.
↩️
Legacy turbine replacement
Replace mechanical turbine on DN500 to DN1200 water lines. No moving parts; same ±0.5 % accuracy; no bearings to wear or recalibrate.
🔥
District-heat substation (with BTU)
Optional PT100 pair adds kWh / MJ / BTU output at ±1.0 % accuracy. Go to the DN25–DN5000 model if ±0.5 % BTU is required.
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 DN2000 |
| Accuracy | Configuration-dependent; see the three Accuracy rows below for C8 inline, W8 wall-mount, and BTU versions |
| Accuracy; C8 inline (no BTU) | ±0.5 % of reading at velocity 0.5 to 5 m/s |
| Accuracy; W8 wall-mount | ±1.0 % of reading at velocity 0.5 to 5 m/s |
| Accuracy; BTU versions (C8 or W8 + PT100) | ±1.0 % of reading at velocity 0.5 to 5 m/s |
| Linearity | ±0.5 % (C8 inline) / ±1.0 % (W8 and BTU) at velocity 0.5 to 5 m/s |
| Repeatability | 0.20 % |
| Velocity range | 0.1 to 12 m/s operating; accuracy spec ±0.5 % (C8 inline) or ±1.0 % (W8 / BTU) 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) |
| 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; ±1.0 % accuracy with BTU pair |
| Display | LCD 2.8-inch IPS, 320 × 240 resolution, 4-direction rotation; unit selection m³/h, LPM, mL/min, GPM, LPH |
| 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 |
| 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 |
| 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
What accuracy does the meter deliver in each configuration?+
Three grades per the factory spec. C8 integral inline standalone (no BTU pair) is ±0.5 % of reading at 0.5 to 5 m/s velocity. W8 split-body wall-mount drops to ±1.0 %. Adding the optional PT100 BTU pair drops to ±1.0 % on either install style. Two independent reasons for the drop: W8 wall-mount adds analog noise on the remote signal cable run, and the PT100 BTU pair compounds a flow tolerance with two temperature tolerances. Either modifier alone moves the spec to ±1.0 %. Buyer who needs ±0.5 % on wall-mount or BTU should specify the DN25-DN5000 model instead, which holds ±0.5 % across all four configurations.
When is this meter the right pick vs the DN25-DN5000 model?+
Three reasons. First, DN cap. This meter covers DN25 to DN2000; covers most plant inline applications without paying for the DN5000 ceiling on the wider-range model. Second, price. This meter sits roughly 25 % below the DN25-DN5000 model at the same DN. Third, accuracy needed is ±0.5 % inline only and the install does not need wall-mount or BTU. If wall-mount or BTU needs ±0.5 %, go to the DN25-DN5000 model. If DN exceeds 2000, go to the DN25-DN5000 model.
How does the 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.
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).
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 with a 2.8-inch LCD, 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.
Need help spec’ing this meter?
Send DN, service liquid, install style, and BTU option. Sized quote within one business day. Lead time 5–7 business days.