Spool Piece Ultrasonic Flow Meter (2-Channel)
Drop-In Pre-Fabricated Spool, Factory-Calibrated as a Sealed Unit
±0.5 % at 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 (open-collector) pulse, relay
- Two-path geometry fixed inside the spool piece; no field commissioning of multi-path alignment.
- One calibration record covers the whole sealed unit, useful for OEM custody-skid certification.
- Inline only on this model; for split-body wall-mount 2-channel, go to the field-installed multi-path model.
The Spool Piece Ultrasonic Flow Meter (2-Channel) ships as a pre-fabricated short pipe segment with the transducers built in. Two paths cross the bore on offset planes; the firmware averages their velocities. The whole spool is factory-calibrated as a sealed unit; multi-path geometry is fixed at the factory, no field alignment needed. DN25 to DN5000, ±0.5 % at 0.5 to 5 m/s. Inline drop-in only. Modbus RTU, 4-20 mA, OCT pulse, relay. 24 V DC. 5–7 business days.
Benefits
- Factory cal as a sealed unit; no field alignment. Two-path geometry fixed inside the spool at the factory. Drop-in between flanges; follow install rules to keep the calibration trace valid.
- Single calibration record covers the whole spool. Useful for OEM custody-skid certification and audit-trail reporting where multiple in-line components would each need their own commissioning trace.
- ±0.5 % across DN25 to DN5000. Velocity 0.5 to 5 m/s. Linearity ±0.5 %, repeatability 0.15 %. Two-path averaging absorbs the velocity-profile asymmetry that biases single-path readings.
- Optional PT100 pair returns kWh / MJ / BTU. PT100 sensors mount externally on supply / return pipework, factory-cal’d separately. Transmitter combines spool flow with PT100 ΔT for energy output on 4-20 mA and Modbus.
- Modbus RTU + 4-20 mA + OCT pulse + relay. 24 V DC, 5 W. Response 500 ms. Pre-configured slave address ships with each meter.
Configure your build.
Build a model code from DN, BTU option, output, and power. Send the code with the application and flange spec. Engineering replies with a sized quote within one business day.
Your configuration
Applications
OEM custody-skid drop-in
White-label custody skid for utility chargeback or industrial allocation. Drop-in spool removes field commissioning risk; one calibration trace covers the whole unit.
Trunk-line primary metering
DN500 to DN5000 utility primary distribution. Two-path averaging holds ±0.5 % on large bore; sealed-unit factory cal removes commissioning uncertainty.
Fiscal sub-meter with audit trail
Tenant billing or internal allocation where the spool ships with a single full-unit calibration trace. Suits installs where field-built multi-path commissioning is impractical.
District-heat substation (with BTU)
Substation primary entry. Optional PT100 pair (external, on supply/return pipework) adds kWh / MJ / BTU on the same transmitter. Drop-in spool fits substation skids.
Full specifications.
| Measurement principle | 2-channel transit-time ultrasonic; two acoustic chord paths on offset planes; firmware averages the two path velocities to estimate the cross-section mean velocity |
|---|---|
| Channels | 2 acoustic paths |
| Body form | Pre-fabricated short pipe segment (spool); transducers built in at the factory; calibrated as a sealed unit before shipment |
| 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 | Inline drop-in spool between flanges (C8 form); no wall-mount split-body version on this model; go to the field-installed Multi-Path 2-Channel for W8 split-body |
| Optional BTU pair | PT100 supply + return pair (mounted externally on the supply and return pipework, factory-cal’d separately); transmitter combines spool flow with PT100 ΔT to solve E = integral of (m-dot x Cp x delta-T) dt; output kWh / MJ / BTU selectable on display and on the 4-20 mA energy-rate channel |
| Output; analog | 4-20 mA, max load 600 ohm |
| Output; digital | RS-485 Modbus RTU |
| Output; other | OCT (open-collector) pulse + high / low alarm; relay 30 V DC at 1 A, switching frequency under 2 Hz |
| Display | LCD 2.8-inch IPS, 320 × 240 resolution, 4-direction rotation; unit selection m³/h, LPM, mL/min, GPM, LPH |
| 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 with face-to-face length) |
| 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 | Full-spool calibration record with each meter (serial number, tested flow range, sealed-unit calibration trace); notified-body custody-transfer certificate is buyer-arranged |
| Lead time | 5–7 business days from factory |
Installation rules.
Spool drop-in is straightforward but five rules keep the calibration trace valid.
- Bolt the spool between flanges with the flow arrow pointing downstream. Reverse install voids the calibration trace until field re-check.
- 5D upstream, 3D downstream straight-pipe (D = pipe diameter). Hold 10D after pumps or out-of-plane double elbows.
- Pipe must stay 100 % liquid-filled. Air pockets falsify the transit-time signal on both paths. Closed loops need a vent on the loop high point.
- Torque flange bolts evenly per the flange-spec table. Uneven torque distorts the spool geometry and the factory calibration drifts.
- Verify the Modbus slave address at commissioning. Factory pre-configures from the BMS or DCS spec; field edits via the front-panel menu.
Frequently asked questions
Need help spec’ing the spool meter?
Send DN, flange spec, service liquid, and BTU option. Sized quote within one business day. Lead time 5–7 business days.