RHM 015

FLOW SENSOR

The RHM 015 Coriolis sensors offers solutions for the lowest flow rates – for flow control, batching and injections up the highest pressures in industry. Small, compact and highest performance.

Range: 0.002 kg/min up to 1.2 kg/min
Pressure: up to 1481 bar (21480 psi)
Temperature: -196°C (-321°F) up to +210°C (410°F)
Accuracy: 0.1 % of rate
Materials: SS 316L / SS 316Ti, Alloy C22 – 2.4602, Super Duplex – 1.4410, Sandvik HP160
Process Connection: ¼" up to 1"

CONFIGURE

CATEGORY Small Size Sensors, Chemical Injection, Oil Measurement

Performance Data

Flow Measurement Uncertainty
Selected Sensors down to ±0.05 % ¹ of rate (Gold Line)
Standard Sensors down to ±0.15 % ² of rate

Flow Measurement Repeatability
Down to ±0.05 % of rate

Temperature Measurement
Better than ±1 °C

Density Calibration (Liquid)
Selected Sensors down to ±0.0005 kg/liter (Gold Line)
Standard Sensors down to ±0.0035 kg/liter

Uncertainties and flow measurement turn-down

The turn down capability from Qₙₒₘ of the flow sensor is driven mainly by its zero point stability. At the very low end of the measuring range the uncertainty (u) is dominated by zero point stability. The zero point stability of a standard sensor is: 0.000036 kg/min (0.000079 lbs/min). Zero point stability of a Gold Line sensor is 0.000019 kg/min (0.000042 lbs/min).

For flow Q ≥ ZP stability / (Base Calibration uncertainty/100) → u = calibration uncertainty
For flow Q < ZP stability / (Base Calibration uncertainty/100) → u = (zero stability/Q) * 100

Uncertainties from environmental and process conditions

If sensors are not zeroed at operating conditions, minor additional uncertainties can arise from elevated temperatures and pressures: ±0.00308 % of maximum flow per °C and ±0.0208 % of maximum flow per bar.
Process temperature effect on density: additional uncertainty of ±0.000641 g/cm³ per °C difference from calibration temperature with standard density calibration and of ±0.000073 g/cm³ per °C difference from calibration temperature with enhanced density calibration. This effect can be mitigated by a simple field density adjustment at operating conditions.
Process pressure effect on mass flow: The effect of pressure on flow measurement is 0.001 % of rate per bar. Compensation is possible by pressure sensor input (analog input or digital write) or manual value entry into the transmitter.
Process pressure effect on density: The effect of pressure on density measurement is 0.00012 g/cm³ per bar. Compensation is possible by pressure sensor input (analog input or digital write) or manual value entry into the transmitter.

Premium Plus, Ultimate, Low Flow and Enhanced Density Calibration come with Gold Line sensors and are not available in all materials, pressure and temperature ranges.

Reference conditions: 18-24°C Water @ 1-3 bar; Gas (Natural gas) 35-100 bar.

Measurement Tube Pressure Ratings

The maximum pressure (pₘₐₓ) of a sensor is determined by its lowest rated part. The lowest rated part can be either the measurement tube (pₘₐₓ indicated below), the connection block/manifold (pₘₐₓ indicated in the mechanical construction section) or the process connection (for pₘₐₓ see published standards or manufacturer information).

	50 °C 122 °F	120 °C 248 °F	210 °C 410 °F
SS 316L (standard)	452 bar 6556 psi	402 bar 5831 psi	339 bar 4917 psi
Alloy C22	477 bar 6918 psi	424 bar 6149 psi	360 bar 5221 psi
SuperDuplex ³ Low Pressure	630 bar 9137 psi	540 bar 7832 psi	410 bar 5947 psi
SuperDuplex ³ Medium Pressure	1050 bar 15229 psi	900 bar 13053 psi	720 bar 10443 psi
SuperDuplex ³ High Pressure	1481 bar 21480 psi	1379 bar 20001 psi	1236 bar 17927 psi
Sandvik HP160®	1227 bar 17796 psi	1183 bar 17157 psi	800 bar 11603 psi

¹ Requires 40 Series transmitter or higher
² Requires 20 Series transmitter or higher
³ Note minimum operating temperature for SuperDuplex stainless steel is -40°C

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Other wetted materials may be possible for chemical compatibility, lower pressure drop, abrasion allowance or other application specific requirements. Rheonik can provide nearly any material for the wetted parts.