RHM 10

FLOW SENSOR

The Model RHM 10 is perfect for small scale production with continuous low flow and small batch dispensing requirements. With a variety of construction styles, the RHM 10 is ideal for countless flow applications.

  • Range: 0 kg/min up to 90 kg/min
  • Pressure: up to 1384 bar (20073 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
  • Process Connection: ½" up to 1 ½"
CONFIGURE
CATEGORY Medium Size Sensors, H2 Filling Station, Chemical Injection, Fuel Consumption, 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)

208 bar
3017 psi

185 bar
2683 psi

156 bar
2263 psi 

SuperDuplex
Low Pressure ³

481 bar
6976 psi

448 bar
6498 psi

402 bar
5831 psi 

SuperDuplex
Medium Pressure ³

753 bar
10921 psi

701 bar
10167 psi

629 bar
9123 psi

SuperDuplex
High Pressure ³

1379 bar
20000 psi

1289 bar
18695 psi

1156 bar
16766 psi

Sandvik HP160®

600 bar
8702 psi

540 bar
7832 psi

490 bar
7107 psi

Sandvik HP160®

1010 bar
14649 psi

970 bar
14069 psi

660 bar
9573 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.