RHM 06

FLOW SENSOR

The RHM 06 is a low risk, low maintenance solution for critical flow applications everywhere. High pressure and temperature options comined with a selection of wetted material make the RHM 06 a true fit and forget device.

  • Range: 0 kg/min up to 36 kg/min
  • Pressure: up to 1722 bar (24975 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
  • Process Connection: ½" 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)
Low Pressure

213 bar
3089 psi

189 bar
2741 psi

160 bar
2321 psi 

SS 316L (standard)
Medium Pressure

580 bar
8412 psi

516 bar
7484 psi

435 bar
6309 psi 

SuperDuplex
Low Pressure ³

580 bar
8412 psi

516 bar
7484 psi

435 bar
6309 psi 

SuperDuplex
Medium Pressure ³

910 bar
13198 psi

847 bar
12285 psi

760 bar
11023 psi

SuperDuplex
High Pressure ³

1234 bar
17898 psi

1149 bar
16665 psi

1030 bar
14939 psi

SuperDuplex
Super High Pressure ³

 

1722 bar
24975 psi

1603 bar
23249 psi

1438 bar
20856 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

Contact us with specification for assessment and availability.

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