The HPC is a compact dual-tube Coriolis mass flow meter designed for low flow measurement of liquids and gases, with measuring ranges of 2 to 20 kg/h (4.4 to 44.1 lb/h) and 5 to 50 kg/h (11.0 to 110.2 lb/h). It measures mass flow directly, measures density and temperature at the same time, and calculates volumetric flow from those values.
Its sensor coils are mounted between the two measuring tubes rather than on them. This gives the sensor noise-reduced, predictable dynamic behavior, lets it work at higher frequencies, and further isolates it from external vibration. Liquid accuracy is ±0.1% of reading, with pressure ratings to 5,800 psi (PN 400) and process temperatures to 356 °F (180 °C).
How the HPC measures very low flow rates
Coriolis meters for very low flow have commonly used a single measuring tube. A single tube is more exposed to external interference, which often requires costly mechanical decoupling. The HPC keeps a dual bent-tube design and moves the sensor coils off the tubes, so the tubes only carry light magnets and keep a stable vibrating behavior.
The coils sit on a static printed circuit board between the measuring tubes. This removes the coil weight from the tubes, eliminates flexible wires that could vibrate at the tube frequency, and allows four sensor coils instead of two for higher resolution. The magnets on the tubes weigh 0.08 g, and the measuring system resonates above 200 Hz.
HPC measuring ranges, accuracy, and ratings
The HPC comes in two measuring ranges: HPC-S01 covers 2 to 20 kg/h with 1.5 mm (0.059 in) measuring tubes, and HPC-S02 covers 5 to 50 kg/h with 2 mm (0.079 in) tubes. Liquid accuracy is ±0.1% of actual flow ± zero stability, gas accuracy is ±0.5% of actual flow ± zero stability, and zero stability is ±0.02% of Qmax.
- Density accuracy: ±0.005 g/cm³ (liquids, with density calibration)
- Nominal pressure: PN 100, PN 320, or PN 400 (1,450, 4,640, or 5,800 psi)
- Process temperature: -40 to 356 °F (-40 to 180 °C); ambient temperature: -4 to 140 °F (-20 to 60 °C)
- Liquid density up to 2 kg/l (124.9 lb/ft³); gas density at least 0.002 kg/l (0.125 lb/ft³) in the operating state
- Viscosity: 0.3 to 50,000 cP, depending on inlet pressure
Materials, process connections, and mounting options
Wetted parts are stainless steel: 316-Ti measuring tubes and a 316L flow body, with aluminum secondary containment and a rugged anodized aluminum sensor housing. The standard process connection is ½" NPT female on a 5.91 in (150 mm) sensor; Gyrolok and Swagelok fittings in 6, 8, 10, and 12 mm are available through stainless steel adaptors.
- Mounting styles: direct pipe mount, wall mount (bracket included), or desk mount
UMC-4 remote transmitter and outputs
HPC sensors are supplied only with a remote-mounted UMC-4 transmitter, connected by cable, because the sensor is too small to carry it. The UMC-4 comes in a painted aluminum field housing (IP67 / NEMA 6) for wall or pipe mounting, or as the UMC4-RM rack-mount version with screw terminals for an ATEX-certified cabinet.
- Power supply: 19 to 36 VDC / 24 VAC (+5% to -20%), 50/60 Hz, or 90 to 265 VAC, 50/60 Hz
- Two passive, galvanically isolated 4-20 mA outputs, assignable to mass flow, volume flow, density, or temperature; output 1 carries HART
- Two passive NPN binary outputs: a pulse or frequency output up to 1 kHz, plus a status output or second pulse output
- Modbus RTU over RS485 as an alternative (not for rack mount or Ex approval)
Hazardous area approvals
The HPC sensor carries ATEX 19ATEX2096X and IECEx CML19.0025X approvals, rated II 1 G / II 1 D Ex ia IIC T4 Ga / Ex ia IIIC T135 °C Da, with a high-temperature variant rated Ex ia IIC T4-T2 Ga. The UMC4 field housing is rated II (1)2G Ex d [ia Ga] IIC T4-T3 Gb.
Installation requirements for the HPC
Install the sensor away from valves, manifolds, and similar fittings that generate turbulence, and support the pipe independently: the sensor must never be used to support a pipe or be installed in suspended pipes. Quick-closing valves belong downstream of the sensor, or at least 10 pipe diameters away, to avoid pressure surges that shift the zero point.
- Outlet pressure must stay above the vapor pressure of the measured product
- Gas content in liquids should not exceed 5%, with small bubbles evenly distributed; large bubbles shift the zero point
Applications for a low flow Coriolis meter
The HPC is designed for direct, continuous mass flow measurement of liquids and gases regardless of conductivity, density, temperature, pressure, or viscosity. Sample media includes chemicals, suspensions, paints, varnishes, lacquers, and pastes. Its short installation length suits space-constrained sites.
Common Questions about HPC - Small Compact Low-Flow Coriolis Mass Flow Meter
A Coriolis meter uses the force exerted on a mass moving toward or away from the rotation point of an oscillating system. The transmitter oscillates the flow tubes through an excitation coil and reads a signal proportional to mass flow. The HPC measures mass flow, density, and temperature as primary values and calculates volume flow.
Two sensor sizes are offered. The HPC-S01 spans 2 to 20 kg/h with a nominal flow of 6 kg/h, and the HPC-S02 spans 5 to 50 kg/h with a nominal flow of 15 kg/h. Zero point stability works out to 0.004 kg/h and 0.01 kg/h respectively, based on ±0.02% of the upper range value.
Yes. Gas measurement is rated at ±0.5% of actual flow plus zero stability, and the gas must have a density of at least 0.002 kg/l in the operating state. Gases that do not form condensate can be installed in any orientation; where condensate can form, flow should run from top to bottom.
Density is measured directly to ±0.005 g/cm³ for liquids when a density calibration is ordered: 3-point as standard or 5-point as a special calibration. Without density calibration, density measurement and empty pipe detection are not available. Volume flow is calculated to ±0.2% of actual value, depending on the transmitter.
The base connection is a ½" NPT female thread. For tubing, 6/8/10/12 mm Swagelok or Gyrolok fittings are supplied through stainless steel adaptors, which add roughly 2.36 in (60 mm) to the 5.91 in (150 mm) sensor length. The ordering code identifies each connection option.
No. Transmitter option E includes a 16.4 ft (5 m) cable plus a wall and 2 in pipe mount kit, option D adds a junction box, and option F is the rack-mount version with screw terminals.
Yes. Sensor configurations R and L pair a Harting Han R23 connector with the ATEX and IECEx intrinsically safe approvals, covering process temperatures to 176 °F (80 °C) and 356 °F (180 °C) respectively. The UMC-4 can be ordered with Ex d, or Ex ec for rack mount, and with an Ex ia signal output.
Vibration resistance has been validated to 1 g between 10 and 150 Hz. Because the pick-up coils are fixed to a circuit board instead of the tubes, the measuring tubes carry only 0.08 g magnets and oscillate above 200 Hz. If pipe vibration exceeds 1 g between 5 and 2,000 Hz, an additional fastening is required.
The HPC is an engineered product with multiple configuration options that must be matched to the application. KOBOLD therefore asks for a completed Application Guide before quoting or accepting an order, unless it is a repeat of a previously specified product. The form is attached to the end of the datasheet and can be submitted to customerservice@koboldusa.com.
Product Specifications
Mass Flow Measuring Ranges
2...20 kg/h to 5...50 kg/h
Connections
1/2" NPT Thread, Gyrolok, Swagelok
Accuracy (Liquid)
± 0.1% of Reading
Max. Operating Temperature
356 °F (180 °C)
Media Categories
Liquid or Gas
Product Features
Rugged Anodized Aluminum Sensor Housing
Wall Mount or Desk-top Models Available
Precise Measurement for Low Flow Ranges
Available with Remote Mount Transmitter
Certifications/Approvals: ATEX, IECEx
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