Precision Handheld Ultrasonic Flow Meter (±0.5 %, DN25–DN5000)
Field Kit for Commissioning Walks, Audit Spot-Checks, and Billing Reconciliation
Transit-time external clamp-on, accuracy spec ±0.5 % at 0.5 to 5 m/s (relaxes to ±1.0 % outside that spec)
24 V DC rechargeable, 5 W. IP54 main unit, IP68 sensor head
Modbus RTU, 4-20 mA, OCT (open-collector transistor) pulse, relay
- P6 grade; covers plant lines up to DN2000, 2.8-inch IPS LCD, 0.20 % repeatability.
- P8 grade; covers trunk lines up to DN5000, 3.5-inch IPS LCD, 0.15 % repeatability (tightest in the family).
- For routine service-call check at ±1.0 %, go to the standard portable family.
The Precision Handheld Ultrasonic Flow Meter is a transit-time field kit for commissioning verification, audit spot-check, and ISO-traceable cross-check of fixed primary meters. External clamp-on install; no pipe cut, no shutdown. ±0.5 % of reading at 0.5 to 5 m/s. P6 grade covers DN25-DN2000 with 2.8-inch IPS LCD and 0.20 % repeatability; P8 grade covers DN25-DN5000 with 3.5-inch IPS LCD and 0.15 % repeatability. Modbus RTU, 4-20 mA, OCT pulse. 24 V DC rechargeable. 5–7 business days.
Benefits
- ±0.5 % of rate, ISO 9001 cal cert in the kit. Tight enough to cite on commissioning handover, ISO 50001 audit, district-heat warranty walks, and disputed-billing reconciliation. Tighter than the standard portable’s ±1.0 %.
- P6 or P8 grade; pick by pipe range and repeatability need. P6: up to DN2000, 0.20 % repeatability. P8: up to DN5000, 0.15 % repeatability with 3.5-inch IPS for outdoor field-service readability.
- External clamp-on install, no pipe cut, no shutdown. Coupling gel + stainless straps; ~30 to 60 minutes per pipe. Same physics as fixed clamp-on; portable form factor.
- IP68 sensor head, IP54 main unit. Sensor head tolerates submersion at the install point; main unit tolerates field-service rain and splash without ingress.
- 24 V DC rechargeable with universal 90-260 V AC dock. Full-day service on battery; overnight recharge. Modbus RTU + 4-20 mA + OCT pulse. Carry case included. 5–7 business days.
Configure your build.
Build a model code from grade, output, accessory, and quantity.
Your configuration
PF-UFM-HP-P8-MOD-NO-UNI
P8 grade (DN25-DN5000, 3.5-inch IPS LCD, 0.15 % repeatability), RS-485 Modbus RTU + 4-20 mA + OCT pulse, no reference thermometer, universal 90-260 V AC dock. ±0.5 % at 0.5 to 5 m/s.
Estimated unit price
$ 6,200
Request engineering quote
Request datasheet
Applications
✅
HVAC commissioning validation
Plant handover walks on chiller primary and condenser. Cite ±0.5 % spot-check to clear inline meters at install. Cal cert in the kit.
🔥
District-heat warranty audit
Substation primary cross-check during warranty period. P8 grade suits DN above 2000 mains and reports the 0.15 % repeatability on the audit form.
📊
ISO 50001 EnMS (Energy Management System) cross-check
Quarterly audit walks; primary-meter drift verification. Defensible to ±0.5 % against challenge in EnMS review.
⚖️
Disputed billing reconciliation
Utility billing dispute, primary meter suspected to drift. Field cross-check produces evidence customers accept.
Full specifications.
| Measurement principle | Transit-time ultrasonic; external clamp-on transducer pair; firmware times the upstream and downstream transit difference |
|---|---|
| Grade | P6 (DN25-DN2000, 2.8-inch IPS LCD 320 x 240, 0.20 % repeatability) OR P8 (DN25-DN5000, 3.5-inch IPS LCD 480 x 320, 0.15 % repeatability) |
| Pipe diameter range | DN25 to DN5000 on P8 grade; DN25 to DN2000 on P6 grade |
| Nominal diameter | Clamp-on external mount; the kit itself has no process port; the host pipe DN is the measured diameter |
| Channels | 1 acoustic path on the handheld kit (single-path transit-time) |
| Install style | External clamp-on field kit with stainless straps; coupling gel between transducer face and host pipe outer surface |
| Optional BTU pair | Not included on the precision handheld; go to the standard portable (PT100 pair on-board) or the inline BTU meter when energy output is part of the audit citation |
| Power | 24 V DC, 5 W; rechargeable Li-ion battery with universal mains charging dock |
| Accuracy | ±0.5 % of reading at velocity 0.5 to 5 m/s on both grades; relaxes to ±1.0 % below 0.5 m/s and above 5 m/s |
| Linearity | ±0.5 % at velocity 0.5 to 5 m/s |
| Repeatability | 0.20 % of span (P6); 0.15 % of span (P8) |
| Velocity range | 0.1 to 12 m/s operating, bi-directional with reverse-flow detection |
| Response time | 500 ms |
| Display | 2.8-inch IPS LCD 320 x 240 (P6) OR 3.5-inch IPS LCD 480 x 320 (P8); 4-direction rotation; unit selection m³, L, GAL combined with day, hour, min, sec time units |
| 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 |
| Power supply | 24 V DC, 5 W; rechargeable Li-ion battery with universal 90-260 V AC mains charging dock; bench supply for desk verification |
| Power consumption | 5 W typical at 4-20 mA output mode |
| Medium | Single-phase liquid, 100 % pipe-fill; water, aqueous solution, chemical reagent; suspended solids 4 % or less |
| Medium temperature | −40 to +60 deg C main unit; −40 to +80 deg C sensor head |
| Ambient temperature | −40 to +60 deg C main unit operating |
| Ingress protection | IP54 main unit; IP68 sensor head (submersible at install point) |
| Hazardous area | Not declared on this model; route Ex-classified service to the fixed clamp-on or insertion counterpart with CNEX Ex d IIC certificate |
| Process connection | External clamp-on; no process port on the kit; mounts on the host pipe outer surface with stainless straps |
| BTU calorimetry | Not included on the precision handheld; for BTU field record, go to the standard portable (PT100 pair) or to a fixed BTU meter |
| Compliance ships standard | ISO 9001 calibration certificate with each kit (serial number + tested velocity range + traceability note); EMC 2014/30/EU; carry case included |
| Lead time | 5–7 business days from factory |
Installation rules.
- 10D upstream, 5D downstream straight-pipe rule. Pick the longest available straight run at the audit point.
- 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 signal; closed loops need a vent on the loop high point upstream of the audit point.
- Check battery state and cal-cert serial at the start of each walk. Log the cal-cert serial on the audit record; kit ships with traceability back to ISO 9001 reference master.
- Recharge overnight on the universal mains dock. 90 to 260 V AC, no rewiring at international sites.
Frequently asked questions
When does precision handheld beat the standard portable?+
Three cases. First, commissioning validation: handover walks on inline meters where the inspector cites ±0.5 % spot-check to clear the install. The standard portable at ±1.0 % cannot tighten the same way. Second, ISO 50001 audit and district-heat warranty: audit reports cite the field-meter accuracy range; tighter is defensible against challenge. Third, disputed billing reconciliation: when a primary inline meter is suspected to drift, a ±0.5 % handheld cross-check produces evidence the customer accepts. For routine service-call quick-check or contractor visits where ±1.0 % is fine, go to the standard portable instead; it is roughly half the price.
P6 vs P8 grade; which one?+
The two grades share the ±0.5 % of rate accuracy spec but differ on repeatability, display size, and maximum pipe range. P6 grade handles DN25 to DN2000 with a 2.8-inch IPS LCD 320 x 240 and 0.20 % repeatability. P8 grade handles DN25 to DN5000 with a 3.5-inch IPS LCD 480 x 320 and 0.15 % repeatability. Pick P6 for HVAC, district-heat, and process service up to DN2000 where 0.20 % repeatability is sufficient. Pick P8 for utility trunk lines, large-bore municipal water audit, and primary district-cooling headers where DN exceeds 2000 or 0.15 % repeatability is needed.
Does this unit include BTU calorimetry?+
No. The precision handheld is a flow-side instrument only. For HVAC + district-heat audit where energy (kWh / MJ / BTU) is part of the field record, pair the handheld output through Modbus into a separate BTU calculator, or go to the standard portable which includes a PT100 clamp-on temperature pair for on-board calorimetry, or use the inline BTU meter on a fixed install. Tighter flow-side accuracy on the precision handheld doesn’t compensate for missing the temperature pair if BTU is what the audit cites.
How long does the battery last on a service-day walk?+
The Li-ion battery pack delivers a full-day service walk at typical 4-20 mA output mode; sized for commissioning, audit, and reconciliation field visits where the meter logs continuously for 6 to 10 hours then returns to the charging dock overnight. The dock takes universal mains 90 to 260 V AC. The unit can also operate on 24 V DC bench supply for desk verification or extended logging beyond battery hold; specify the bench supply at order.
What ships in the kit and what is the lead time?+
The kit ships with the main unit (P6 or P8 grade), the matched transducer pair, ultrasonic coupling gel, stainless mounting straps for the pipe size range, signal cable, 24 V DC mains charging dock with universal 90-260 V AC input, ISO 9001 calibration certificate (serial number, tested velocity range, traceability note), and carry case. Lead time is 5 to 7 business days from the factory. Optional add-on: 0.5 deg C reference thermometer for separate temperature record on audit walks.
Need help spec’ing this kit?
Send the typical DN range you audit, the field purpose (commissioning, audit, reconciliation), and whether reference temperature is in scope. Sized quote in one business day.