RHM 04

FLOW SENSOR

The RHM 04 is a fast response solution for batching, dispensing and filling applications. Very high pressure ratings allow deployment in processes where Coriolis meter use has not been possible in the past.

Range: 0.05 kg/min up to 18 kg/min
Pressure: up to 1401 bar (20319 psi)
Temperature: -196°C (-321°F) up to +210°C (410°F)
Accuracy: 0.1 % of rate
Materials: SS 316L / SS 316Ti, Super Duplex – 1.4410, Sandvik HP160, Alloy C22 – 2.4602
Process Connection: ¼" up to 1"

CONFIGURE

CATEGORY Small Size Sensors, H2 Filling Station, Chemical Injection, Fuel Consumption, Refrigerant Filling, Oil Measurement, Painting/Coating Lines, Plastics Production

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 ±0.001 kg/liter

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)	177 bar 2567 psi	157 bar 2277 psi	132 bar 1915 psi
SuperDuplex ³ Low Pressure	712 bar 10327 psi	662 bar 9602 psi	594 bar 8615 psi
SuperDuplex ³ Medium Pressure	1087 bar 15766 psi	1048 bar 15200 psi	709 bar 10283 psi
SuperDuplex ³ High Pressure	1401 bar 20320 psi	1304 bar 18913 psi	1170 bar 16969 psi
Sandvik HP160®	600 bar 8702 psi	540 bar 7832 psi	490 bar 7106 psi
Sandvik HP160®	1087 bar 15766 psi	1048 bar 15200 psi	709 bar 10283 psi

Uncertainties and flow measurement turn-down

All uncertainty statements refer to reference conditions – mass flow of water, 18 – 24 °C, 1 – 3 bar in a standard temperature, pressure and material configuration sensor. The sensor can be used to measure gas – uncertainty values for gas equal the liquid value plus 0.3 %. Reference conditions for gas are mass flow of natural gas, 18 – 24 °C, 35 to 100 bar in a standard temperature, pressure and material configuration sensor.

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

For flow Q ≥ zero stability / (calibration uncertainty/100) u = calibration uncertainty
For flow Q < zero stability / (calibration uncertainty/100) u = (zero stability/Q) x 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/cc per bar. Compensation is possible by pressure sensor input (analog input or digital write) or manual value entry into the transmitter.

(1) Requires 40 Series transmitter or higher
(2) Requires RHE16 or higher transmitter.
(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.