GE RHM 20 User manual

RHM 20
The RHM 20 can measure ow rates up to 300 kg/
min (661 lb/min) with temperatures in excess of
350°C and pressures up to 392 bar. This model is
medium sized with true reliability for a versatile
solution, manufactured by GE’s Rheonik mass
owmeter experts.
Applications
• General control • Dosing • Mixing
• Batching • Injections • Filling
Features
• Suitable for pressure up to 392 bar
• Flow uncertainty down to 0.15%
• Density uncertainty down to 0.5%
• Repeatability better than 0.05%
• Unique torsion oscillator
• Typical measuring ranges from 3 to 300 kg/min
• Minimal ows as low as 2.25 kg/min
• Optimized solutions for batching operation
• Customization possible
• Hazardous Area Approvals (ATEX, CSA, ...)
Medium Sized Coriolis
Mass Flowmeter
Advantages
• Torsion oscillator design assures most stable and
basically drift free measurement and increased
signal to noise ratio
• Not sensitive to changes in pressure
• Longest life time and increased safety (low stress
in welds and increased wall thickness against
abrasion)
• No moving parts, practically no maintenance
• Removable connection manifold available
GE
Measurement & Control
g

General Dimensions RHM 20
PM0/SM0 (parallel/serial manifold construction)
Type removable manifold with PTFE seals and thread connection
Process Connection Face to face length (L) Order Code
mm in
Standard Female Thread G 1" 136 5.35 G1
Female Thread 1" NPT 136 5.35 N1
Process Connection Face to face length (L) Order Code
mm in
Standard Flange DIN DN40/PN40 460 18.11 C1
Flange DIN DN40/PN100 500 19.69 C2
Flange ANSI 1 1/2" 150# RF/SF 460 18.11 F1
Flange ANSI 1 1/2" 300# RF/SF 460 18.11 F2
Flange ANSI 1 1/2" 600# RF/SF 500 19.69 F3
Optional JIS B 2220 RF 10k 40A (1 1/2") 460 18.11 J1
JIS B 2220 RF 20k 40A (1 1/2") 460 18.11 J2
A1 = 285 mm (11.22 in) B1 = 50 mm (1.97 in) Terminal box (without cable gland) 125 x 80 x 58 mm (4.92 x 3.15 x 2.28 in)
A2 = 300 mm (11.81 in) B2 = 70 mm (2.76 in) W = 0 mm for Temperature Range T1 and TA
H1 = 454 mm (17.87 in) W = 150 mm (5.91 in) for Temperature Range T2
H2 = 486 mm (19.11 in)
For weights and packaging dimensions please see last page of this section.
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Type removable manifold with PTFE seals and ange connection

3
General Dimensions RHM 20
PF0 (parallel, sealless construction with ange connection))
Process Connection Face to face length (L) Order Code
mm in
Standard Flange DIN DN50/PN40 460 18.11 D1
Flange DIN DN50/PN100 500 19.69 D2
Flange ANSI 2" 150# RF/SF 460 18.11 A1
Flange ANSI 2" 300# RF/SF 460 18.11 A2
Flange ANSI 2" 600# RF/SF 500 19.69 A3
Flange ANSI 2" 1500# RF/SF 500 19.69 A5
Flange ANSI 2" 1500# RTJ 500 19.69 R2
Optional Flange DIN DN50/PN160 500 19.69 D3
Flange ANSI 2" 600# RTJ 500 19.69 R1
Flange ANSI 2" 2500# RF/SF 500 19.69 A8
Flange ANSI 2" 2500# RTJ 500 19.69 R4
Flange JIS RF 10k 50A (2") 460 18.11 K1
Type parallel, welded measuring loops without seals and ange connection
PFT (parallel, sealless construction with thread connection)
Process Connection Face to face length (L) Order Code
mm in
Standard Female Thread G 1" 400 15.75 G1
Female Thread 1" NPT 400 15.75 N1
Swagelok 1" Tube inlet
(SS-1610-1-16W)
560 22.05 W1
Type parallel, welded measuring loops without seals and thread connection
A1 = 285 mm (11.22 in) B1 = 50 mm (1.97 in) Terminal box (without cable gland) 125 x 80 x 58 mm (4.92 x 3.15 x 2.28 in)
A2 = 300 mm (11.81 in) B2 = 70 mm (2.76 in) W = 0 mm for Temperature Range T1 and TA
H1 = 454 mm (17.87 in) W = 150 mm (5.91 in) for Temperature Range T2, T3 and T4
H2 = 540 mm (21.26 in)
For weights and packaging dimensions please see last page of this section.

4
General Dimensions RHM 20
SF0 (serial, sealless construction without dead spaces) (*)
Type single path, welded measuring loops without seals and sanitary connection
Process Connection Face to face length (L) Order Code
mm in
Standard Sanitary 1" Triclamp,
DIN 32676
350 13.78 S1
Sanitary NW20, DIN 11851 350 13.78 S2
Type single path, welded measuring loops without seals and ange connection
Process Connection Face to face length (L) Order Code
mm in
Standard Flange DIN DN50/PN40 460 18.11 D1
Flange ANSI 2" 150# RF/SF 460 18.11 A1
Flange ANSI 2" 300# RF/SF 460 18.11 A2
A1 = 285 mm (11.22 in) B1 = 50 mm (1.97 in) Terminal box (without cable gland) 125 x 80 x 58 mm (4.92 x 3.15 x 2.28 in)
A2 = 300 mm (11.81 in) B2 = 70 mm (2.76 in) W = 0 mm for Temperature Range T1 and TA
H1 = 454 mm (17.87 in) V = 26 mm (1.02 in) W = 150 mm (5.91 in) for Temperature Range T2, T3 and T4
H2 = 540 mm (21.26 in)
(*) SF0 construction contains brazed joints (brazing material B-Ni82CrSiBFe-970/1000) which are not as corrosion resistant as the piping material 1.4571 (316Ti). Fully
welded joints for corrosive liquids and higher pressure ratings can be provided – please consult your local agent.
Weight in standard manifold construction with female threads: approx. 16 kg (35 lb)
Weight in standard sealless construction and 150# anges: approx. 23 kg (51 lb)
Shipping on pallet approx. 80 x 60 x 65 cm (31.5 x 23.6 x 25.6 in), gross weight with sealless construction, 150# standard anges and RHE 08 approx. 35 kg (77 lb)
Finish type of our ANSI anges corresponds to SF (AARH 125 up to 250 μin, Ra 3.2 up to 6.3 μm)
For customization with regard to face to face length and special ttings, please consult your local agent
Please note that larger diameter process connections are always possible

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Pressure Rating RHM 20
The maximum pressure (pmax) of a sensor is determined by its weakest part. The weakest part can be the measuring
loops (pmax indicated below) or the construction type (pmax indicated in the Basic Order Code section, last page) or the
selected anges / ttings (for pmax please see respective standard).
pmax of P1 measuring loops, standard
M1 standard material - 1.4571 (316Ti)
OD x WT 20 x 1 mm (0.787 x 0.039 in)
bar °C psi °F
120 50 1740 122
110 120 1595 248
92 210 1334 410
77 350 1117 662
pmax of P1 measuring loops
M3 optional material - 2.4602 (Alloy C22)
OD x WT 19.1 x 1.25 mm (0.752 x 0.049 in)
bar °C psi °F
193 50 2799 122
171 120 2480 248
146 210 2118 410
121 350 1755 662
pmax of P2 measuring loops
M1 standard material - 1.4571 (316Ti)
OD x WT 20 x 2 mm (0.787 x 0.079 in)
bar °C psi °F
250 50 3626 122
225 120 3263 248
193 210 2799 410
162 350 2350 662
pmax of P2 measuring loops
M3 optional material - 2.4602 (Alloy C22)
OD x WT 19.1 x 1.65 mm (0.752 x 0.065 in)
bar °C psi °F
260 50 3771 122
232 120 3365 248
196 210 2843 410
163 350 2364 662
pmax of P4 measuring loops
M1 standard material - 1.4571 (316Ti)
OD x WT 20 x 3 mm (0.787 x 0.118 in)
bar °C psi °F
392 50 5685 122
345 120 5004 248
300 210 4351 410
250 350 3626 662

Performance RHM 20
Max Flow Rate Qmax and Qnom (*) = 300 kg/min (661 lb/min)
Standard Models
Flow Rate Uncertainty
kg/min lb/min in % of reading
300 661 0.20
150 331 0.20
50 110 0.20
15 33.1 0.20
613.2 0.50
Goldline Models (**) - selected sensors
Flow Rate Uncertainty
kg/min lb/min in % of reading
200 441 0.15
100 220 0.15
75 165 0.15
50 110 0.15
20 44.1 0.15
Low Flow Models (**) - selected sensors
Flow Rate Uncertainty
kg/min lb/min in % of reading
300 661 0.20
150 331 0.20
15.0 33.1 0.20
6.0 13.2 0.50
4.5 9.9 0.60
Repeatability
Better ± 0.1% of rate,
Goldline 0.05%
Density
Down to 0.5% uncertainty
Temperature
Better ± 1°C
Uncertainty % DP (bar)
Uncertainty % DP (bar)
Uncertainty % DP (bar)
Flow Rate kg/min
Flow Rate kg/min
Flow Rate kg/min
(*) Nominal ow Qnom refers to roughly 8 - 10 m/s
(26 - 33 ft/s) velocity in measuring loops for best
performance.
(**) Selected sensors are only available in combination
with temperature options T1, TA, standard material and
pressure range.
• Serial/single path versions oer the same accuracy at
half the ow (Qmax serial version = 150 kg/min).
• No relevant pressure eect due to torsional oscillation
and semi-circle (non-deforming) measurement
section.
• Uncertainty of reading (incl. zero drift) indications refer
to reference conditions H2O, 18-24°C (66 - 76°F), 1 - 3
bar (15 – 45 psi) and installation according to eld
manual.
• Pressure drop indications refer to H2O, with parallel
measuring loops type P1 and standard manifold block
connections.
• For calibration to customer range and / or with
improved uncertainty, please consult your local
agent.
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7
General Specications RHM 20
Temperature Range
• NT Models from -20 to +120°C (-4 to +248°F)
• ET Models from -45 to +120°C (-49 to +248°F)
• ET2 Models from -45 to +210°C (-49 to +410°F)
• ET1 Models from -196 to +50°C (-320 to +122°F)
• HT Models from 0 to 350°C (+32 to +662°F)
(Heating for housing optional, please consult your local agent)
Electrical Connection
• Junction box Aluminium coated (standard). Junction box in
SS 316Ti optional
• Cable entry M25 x 1.5. Optional cable entries M20 x 1.5, 1/2”
NPT or 3/4” NPT
• Max cable length between RHM and RHE is 100m (330 ft).
200m (660 ft) only with factory approval
Material of Wetted Parts
• 1.4571 / SS 316 Ti / UNS S31635 (standard)
• 2.4602 / Alloy C22 / UNS N06022
• Tantalum
• Others on request
Sensor Enclosure/Housing
• Stainless Steel 1.4301 / SS 304, optional in 1.4571 / SS 316Ti.
Others on request
• Protection Class IP 65. Optional IP 66 / NEMA 4x
Approvals
• ATEX Ex II 1 G, EEx ia IIC T6-T1
• CSA USA-Canada, Class I, Div. 1, Groups A, B, C, D
• PED according to directive 97/23/EC: Art.3 (3) Sound
Engineering Practice (SEP), Module A1 or Module B + C1 –
depending on construction type and measured uid
• Others on request

Sensor Size
Temperature Rating
T1 NT from -20°C to +120°C (standard)
TA ET from -45°C to +120°C
T2 ET2 Extended Temperature Range from -45°C to +210°C
T3 ET1 Extended Temperature Range from -196°C to +50°C
T4 HT High Temperature Range from 0°C to +350°C
Pressure Range of Measuring Loops @ 120°C and M1 material
P1 pmax = 110 bar (standard)
P2 pmax = 225 bar
P4 pmax = 345 bar
Construction Type (pmax indications @120°C)
PM0 Parallel Measuring Loops with removable Manifold and PTFE Seals,
pmax = 270 bar with thread connection, 185 bar with ange connection
SM0 Serial Measuring Loops with removable Manifold and PTFE Seals, pmax = 130 bar
PF0 Parallel Measuring Loops Seal Less Version
SF0 Serial Measuring Loops Seal Less Version Sanitary, pmax = 42.9 bar
upon request, a fully welded version is available, pmax = 200 bar
PFT Parallel Measuring Loops Seal Less Version for Thread Connection, pmax = 210 bar
Material of Wetted Parts
M1 Measuring Loops and Manifold/Connection 1.4571 (316Ti) (standard)
M3 Measuring Loops and Connection Part 2.4602 (Alloy C22), Seal Less Construction only
M4 Measuring Loops and Connection Part Tantalum, PF0 Construction Type only
Process Connection
C1 Flange DIN DN40/PN40 Form C (EN 1092-1 Form B1)
C2 Flange DIN DN40/PN100 Form E (EN 1092-1 Form B2)
D1 Flange DIN DN50/PN40 Form C (EN 1092-1 Form B1)
D2 Flange DIN DN50/PN100 Form E (EN 1092-1 Form B2)
F1 Flange ANSI 1 ½” 150# RF/SF
F2 Flange ANSI 1 ½” 300# RF/SF
F3 Flange ANSI 1 ½” 600# RF/SF
A1 Flange ANSI 2” 150# RF/SF
A2 Flange ANSI 2” 300# RF/SF
A3 Flange ANSI 2” 600# RF/SF
A5 Flange ANSI 2” 1500# RF/SF
R2 Flange ANSI 2” 1500# RTJ
G1 Female Thread G 1”
N1 Female Thread 1” NPT
W1 Swagelok 1” Tube inlet (SS-1610-1-16W), standard material only
S1 Sanitary 1” Triclamp, DIN 32676, pmax = 17.2 bar @ 120°C
S2 Sanitary NW20, DIN 11851, pmax = 40 bar @ 120°C
Others on request
RHM20 - - - -
Basic Order Code RHM 20
920-499A
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