Compact Clamp-On Ultrasonic Flow Meter (±2.0 %, DN6–DN200)
Small Plant Water Branches at ±2.0 %, With Optional Heat-Meter Pairing
Transit-time external clamp-on, 0.3 to 5 m/s, response 500 ms
24 V DC, 3 W. IP65 housing on the 2.4-inch IPS version (IP54 standard on OLED + 1.54-inch IPS, IP65 factory option)
Modbus RTU, 4-20 mA, OCT (open-collector transistor) pulse
- Display choice spans 1.3-inch OLED entry through 1.54-inch IPS to 2.4-inch IPS at full IP65.
- Optional PT100 pair adds kWh / MJ / BTU energy output at the same flow-side ±2.0 %.
- For ±0.5 % precision or DN above 200, go to the full-size clamp-on family.
The Compact Clamp-On Ultrasonic Flow Meter is a transit-time instrument that clamps to the outside of a host pipe (OD 9.53 to OD 220 mm, DN6 to DN200). No pipe cut, no shutdown. ±2.0 % of reading at 0.3 to 5 m/s; repeatability 0.8 %. Display choice spans 1.3-inch OLED, 1.54-inch IPS, and 2.4-inch IPS. Modbus RTU, 4-20 mA, OCT pulse. Optional BTU pair for kWh / MJ / BTU. 24 V DC, 3 W. 5–7 business days.
Benefits
- External clamp-on install; no pipe cut, no shutdown. Transducer pair mounts on host pipe with coupling gel and stainless straps. 1 to 2 hours per meter on DN50-DN200.
- Sub-DN200 host pipe coverage. OD 9.53 to OD 220 mm covers small branch lines, sub-utility taps, packaged-skid sub-loops. Above DN200, go to the full-size clamp-on family.
- Display choice for the same firmware. 1.3-inch OLED 128 x 64 entry, 1.54-inch IPS LCD 240 x 240, or 2.4-inch IPS LCD 320 x 240. Pick by readability need at the install point.
- Optional BTU version at the same ±2.0 % flow side. PT100 supply + return pair. Output kWh / MJ / BTU. Energy-output accuracy widens with delta-T; see FAQ.
- 24 V DC, 3 W. Modbus RTU + 4-20 mA + OCT pulse. IP54-IP65 transmitter housing (display version dependent). 5–7 business days from the factory.
Configure your build.
Build a model code from host-pipe OD, display version, BTU option, output, and power.
Your configuration
PF-UFM-CO-OD60-IPS24-FLOW-MOD-DC
OD 60 mm host pipe (DN50 / 2 in NPS), 2.4-inch IPS LCD with full IP65 housing, flow-only (no PT100 pair), RS-485 Modbus RTU + 4-20 mA + OCT pulse, 24 V DC. ±2.0 % at 0.3 to 5 m/s.
Estimated unit price
$ 580
Request engineering quote
Request datasheet
Applications
🏭
Plant sub-utility branch flow measurement
Small DN15-DN100 branch lines off plant primary. Cooling-water tap, condensate return, dosing reference. ±2.0 % suits trend logging.
🔁
Secondary verification
Cross-check a primary inline meter for drift on DN50-DN200. ±2.0 % is enough to flag a 5 % deviation that warrants service.
📦
Packaged-skid sub-loop telemetry
Chiller cabinet branch, dosing skid sub-line, lab water cart. Modbus into the skid PLC; OLED display for service access.
🔥
Sub-metering BTU on small loops
Optional PT100 pair adds energy output on small DHW or chilled-water sub-loops at the same flow-side ±2.0 %. Not billing grade.
Full specifications.
| Measurement principle | Transit-time ultrasonic; external clamp-on transducer pair on host pipe; firmware times the upstream and downstream transit difference |
|---|---|
| Host pipe range | OD 9.53 to OD 220 mm (DN6 to DN200) |
| Nominal diameter | Clamp-on external mount; the meter itself has no process port; the host pipe DN6 to DN200 is the measured diameter (see Host pipe range row above) |
| Channels | 1 acoustic path (single-path transit-time) |
| Install style | External clamp-on with stainless straps; transducer pair clamped to host pipe outer surface with coupling gel |
| Optional BTU pair | PT100 supply + return pair on the BTU version; output kWh / MJ / BTU; flow-side accuracy stays at ±2.0 % (see FAQ for energy-output delta-T window) |
| Accuracy | ±2.0 % of reading at velocity 0.3 to 5 m/s |
| Linearity | ±2.0 % at velocity 0.3 to 5 m/s |
| Repeatability | 0.8 % of span |
| Velocity range | 0.1 to 5 m/s operating; accuracy spec ±2.0 % within 0.3 to 5 m/s |
| Response time | 500 ms |
| Display | 1.3-inch OLED 128 x 64 (entry); 1.54-inch IPS LCD 240 x 240 with 4-direction rotation; 2.4-inch IPS LCD 320 x 240 with 4-direction rotation |
| 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 on IPS-display versions (OLED version: pulse + alarm, no relay) |
| Power | 24 V DC, 3 W |
| Medium | Single-phase liquid, 100 % pipe-fill; water, aqueous solution, chemical reagent; suspended solids 4 % or less |
| Medium temperature | −10 to +50 deg C |
| Ambient temperature | −10 to +50 deg C operating |
| Ingress protection | IP54 standard on OLED + 1.54-inch IPS versions (IP65 available as factory option); IP65 standard on 2.4-inch IPS version |
| Pipe materials supported | Steel, stainless, ductile iron, copper, PVC, PE, HDPE (acoustic-coupling treatment may be needed on cement-lined or scale-coated host pipe) |
| Process connection | External clamp-on; no process port on the meter; mounts on the host pipe outer surface with stainless straps |
| Hazardous area | Not declared on this model; route Ex-classified service to the full-size clamp-on or insertion counterpart with CNEX Ex d IIC certificate |
| Compliance ships standard | Calibration record with each meter (serial number + tested flow range); ISO 9001 calibration certificate; mill-cert traceability on the body |
| Lead time | 5–7 business days from factory |
Installation rules.
- 10D upstream, 5D downstream straight-pipe (D = host-pipe diameter). Small-bore service still benefits from the rule; short runs can be served at relaxed accuracy.
- Clean and prep the host-pipe outer surface. Wipe paint, rust, and insulation off the transducer footprint. Apply coupling gel; secure with stainless straps at the specified spacing.
- Verify 100 % pipe-fill. Air pockets falsify the transit-time signal. Mount on horizontal or vertical-upward; avoid high-point air collection.
- Re-apply coupling gel every 6 to 12 months in outdoor service. UV and temperature cycles degrade the gel layer; indoor service extends life beyond 12 months.
- Configure Modbus register and slave address at commissioning. Factory pre-configures from BMS or DCS spec; record both in the commissioning log.
Frequently asked questions
How does compact clamp-on differ from the full-size clamp-on family?+
Same transit-time physics on both, but a different scale and accuracy class. Compact clamp-on covers OD 9.53 to OD 220 mm host pipe (roughly DN6 to DN200) at ±2.0 % of reading; the full-size clamp-on family covers DN15 to DN6000 via three transducer pairs (S, M, L) at ±0.5 % of rate. Compact wins on price and form factor for sub-DN200 sub-utility branches, secondary verification, and packaged-skid sub-loops where ±2.0 % is sufficient. Full-size wins on accuracy and on large-bore pipe.
When is ±2.0 % accuracy enough?+
Trending, dosing reference, secondary verification of a primary meter, packaged-skid sub-loop telemetry, lab water audit, batch reconciliation at small DN. Not for custody-transfer, fiscal billing, or trade reconciliation; those need ±0.5 % or tighter. The ISO 4064 R-class threshold for residential billing also lands well above ±2.0 %, so this meter is not a utility billing meter even though it covers the same DN range.
Which display version fits my install?+
The display versions span a price-readability trade-off. 1.3-inch OLED 128 x 64 is the smallest and lowest cost; readable indoors at close range, suits panel-mount sub-loops. 1.54-inch IPS LCD 240 x 240 adds 4-direction rotation and color contrast; readable outdoors and at panel-front service. 2.4-inch IPS LCD 320 x 240 is the largest with full IP65 housing; readable from across the plant aisle. Specify display version at order; the firmware feature set is otherwise identical.
Does the BTU version add accuracy step-down?+
No. The BTU version pairs the transit-time flow side with a PT100 supply + return temperature pair and runs the calorimetry firmware that solves E = integral of (m-dot x Cp x delta-T) dt. Flow-side accuracy stays at ±2.0 % of reading. Energy-output accuracy depends on the delta-T window the same way other heat meters do; at 4 K HVAC delta-T the PT100 0.1 deg C resolution dominates and energy accuracy sits in the 5 to 7 % range; at 30 K DHW delta-T the same hardware delivers under 4 %. For tighter billing-grade BTU, go to the inline or large-bore precision counterpart instead.
What ships in the package and what is the lead time?+
The package ships with the transmitter (display version per order), the transducer pair, ultrasonic coupling gel, stainless mounting straps for the specified host-pipe OD range, signal cable, and the calibration record (serial number + tested flow range). BTU version adds the PT100 supply + return pair plus thermowell or clamp-on temperature mount. Lead time is 5 to 7 business days from the factory; ISO 9001 calibration certificate ships standard.
Need help spec’ing this meter?
Send host-pipe OD, display version, and BTU option. Sized quote within one business day. Lead time 5–7 business days.