McMillan RHODIUM Series Flow Controllers are capable of measuring and controlling virtually any clean, dry gas as low as 0 – 50 sccm or as high as 0 – 10 L/min. Repeatable results are achieved using a platinum-based micro-electromechanical system (MEMS) flow rate sensor device that is manufactured with extreme precision to ensure consistent results from unit to unit.
McMillan RHODIUM Series Flow Controllers are capable of measuring and controlling virtually any clean, dry gas as low as 0 – 50 sccm or as high as 0 – 10 L/min. Repeatable results are achieved using a platinum-based micro-electromechanical system (MEMS) flow rate sensor device that is manufactured with extreme precision to ensure consistent results from unit to unit.
To actively control flow rate, RHODIUM units leverage a high precision PID controller to control a fast-acting solenoid valve. Analog inputs enable direct, fast, and accurate control of the gas flow. Integrated analog outputs report current flow rate for monitoring and control verification.
Compared to conventional mass flow controllers, RHODIUM Series Flow Controllers offer smaller size, higher accuracy, larger turn-down ratios, and faster response times.
The RHODIUM Series has two female threaded ports on the bottom of the device that accept M4 bolts. An optional mounting plate is available to accommodate installation from the topside.
The RHODIUM Series is calibrated in the vertical position. All other positions can cause offset depending on pressure and gas conditions. Flow is unidirectional and must pass through the unit as indicated on the device. All units are calibrated with and for dry nitrogen (N2). Calibration for other gases may be available – please contact the factory.
A male 9-pin D-sub connector is provided for all power and signal connections. Optional accessories include a mating cable with pigtail leads (9941-1-2M), a connection block that provides screw-down terminals and a port for a power adapter (9941-3), and 120/240 VAC power adapters that can be used with the connection block (9681-4 or 9691-4).
RHODIUM Series units require 24VDC power and typically draw less than 250 mA of current.
Two I/O signal configurations are available: 0-5 VDC or 4-20mA. In either case, the lower end of the range represents zero flow (0 VDC or 4 mA) and the high end of the range represents 100% rated flow (5 VDC or 20 mA).
Each unit features female SAE 9/16-18 straight thread ports for the inlet and outlet. Optional fittings are available with either ¼” or 3/8” stainless steel (316L) tube connections.
Pin Assignments for DB9 Connector
Diagram of Flow Controller Logic
Optional 8511-MP Mounting Plate
Flow Range
See Product Configurator for Flow Range Options
Gas Type
Nitrogen (N2)
Calibration Conditions
Temperature: 32 °F [ 0 °C ]
Pressure: 760 mmHG [ 0.001 barg ]
Accuracy
± 1.0% of full scale
Repeatability
± 0.015% of full scale
Response Time
4 ms
Settling Time
150ms
Control Range
2% to 100%
Operating Temperature
32 to 122 ° F [ 0 to 50 ° C ]
Operating Humidity
5 to 95% relative humidity
Pressure Range
Operating: 0 to 130.5 psig [ 0 to 9 barg ]
Burst: 435.1 psig [ 30 barg ]
Leak Tightness
1 x 10
Differential Pressure
Min: 7.3 to 43.5 psig [ 0.5 to 3 barg ]
Max: 101.5 psig [ 7 barg ]
Gas Compatibility
Non-corrosive gases
Analog Input
0-5 VDC or 4-20 mA
Analog Output
0-5 VDC or 4-20 mA
Wetted Materials
Aluminum
Silicon
Silicon Nitride
Gold
Platinum
Silicone Die-attach
Epoxy
Stainless Steel
Brass
FKM
Fittings (Optional)
Stainless Steel
9/16-18 SAE
1/4" or 3/8" Tube Fitting with O-Ring Seal
Voltage Supply DC
Nominal = 24 V ± 10%
Ripple = < 50 mV
Current Supply DC
Typical = < 200 mA
Maximum < 250 mA
Warm-Up Time
Deviation < ± 0.1% of full scale: 3 sec
Optimum Accuracy: 15 min
Analog Output
Resistive Load: > 2 Kohms
Capacitive Load: < 100 nF
| Categories | Title | Summary | File Size | Download |
|---|---|---|---|---|
| Model (STP) | 8511-XX-XX with 9853-9-T6 Fittings | 3D model files for RHODIUM (Model 8511) with 9853-9-T6 Fittings | 2 MB | |
| Model (STP) | 8511-XX-XX with 9853-9-T4 Fittings | 3D model files for RHODIUM (Model 8511) with 9853-9-T4 Fittings | 3 MB | |
| Manuals (PDF) | RHODIUM_OM-85X 2405 2 | Operating manual for the RHODIUM (Model 8511) | 2 MB | |
| Dimensions (PDF) | RHODIUM_DD-85X 2405 1 | Dimensional drawings for the RHODIUM (Model 8511) | 730 KB | |
| Data Sheets (PDF) | RHODIUM_DS-85X 2405 6 | Latest data sheet for the RHODIUM (Model 8511) | 2 MB |
We are experts in all things flow. As a company founded and run by engineers, we seek to understand your application and then build a product solution that will solve your most difficult challenges.
McMillan Flow sales agents are strategically located across the
globe. Find your nearest distributor or office.
McMillan Company
7075 Ranch Rd 2338
Georgetown, TX 78633
sales@mcmflow.com
Phone: (844) MCM-FLOW
Copyright © 2024 McMillan Flow Products. All Rights Reserved.
McMillan Flow Products is located in the U.S.A. and all products are manufactured in our Texas plant.
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