Flow Control
0550E
Brooks Instrument Thermal Mass Flow Controller
About this part
The Brooks Model 0550E measures and controls gas mass flow using a thermal sensor, integral modulating control valve, electronic control system, and internal AC power supply. It accepts a 0–5 VDC command and provides analog outputs proportional to mass flow. Full-scale flow, calibration gas, process connections, and internal ranging components are configured for the individual unit and must be verified from its complete identifier and nameplate
Configurations vary. Verify the exact unit before choosing a replacement.
Key Facts
Specifications
| Manufacturer | Brooks Instrument |
| Model | 0550E |
| Instrument type | Thermal mass flow controller for gases |
| Control architecture | Thermal mass-flow sensor with integral electronic control circuit and modulating solenoid valve |
| Accuracy | ±1% of full scale over the specified range when operated at calibration conditions |
| Control range | 2–100% of configured full scale |
| Repeatability | 0.25% of rate over the specified range |
| Response time | Within 2% of full scale of the final value in 5 seconds or less for step changes between 3% and 100%, including transitions to or from valve override |
| Warm-up time | 40 minutes |
| Full-scale flow | Unit-specific; established by calibration and the installed flow restrictor |
| Calibration gas | Unit-specific; gas changes alter the relationship between analog output and actual mass flow |
| Primary power | 105–125 VAC, 50/60 Hz, 15 W maximum |
| Command input | 0–5 VDC at 0.25 mA |
| Mass-flow outputs | 0–10 VDC into 2 kΩ minimum or 0–1 VDC into 1 MΩ minimum |
| Reference output | 5 VDC ±0.2%, 1 kΩ minimum load |
| Valve override | +10 to +24 VDC opens the valve; −10 to −24 VDC closes it; −5 to +5 VDC or an open terminal permits normal operation |
| Mating connector | Amphenol 165-10 |
| Operating temperature | 15–45 °C |
| Calibration pressure | 25 psig |
| Maximum pressure | 1500 psig |
| Minimum inlet pressure | 10–50 psig; 15–50 psig for 200 slpm hydrogen configurations |
| Leak integrity | 3 × 10^-8 atm·cc/s helium maximum, inboard to outboard; valve leakage less than 2% of full scale |
| Standard process connections | 1/4-inch compression fittings |
| Optional process connections | Other inch compression fittings, -4 and -8 VCO, and -4 VCR were available by configuration |
| Weight | 5 lb 10 oz |
| Standard gas conditions | 70 °F (21.1 °C) and 760 mm Hg |
Configuration boundary
0550E is the base model designation, while the complete identifier and nameplate define the configured gas service and full-scale range.
Compatibility and replacement context
Compatibility references concern interfaces and installation requirements; they do not make other controllers exact aliases for 0550E.
Installation and service notes
The manufacturer manual identifies several installation limits important to safe and accurate operation.
- Install an upstream in-line filter selected for the configured full-scale flow and acceptable pressure drop.
- Where possible, provide at least ten pipe diameters of straight tubing immediately upstream of the controller.
- The integral control valve provides precision regulation but is not designed for positive shutoff; use a separate shutoff valve when positive isolation is required.
- Mounting orientation may differ from the calibration orientation, but the unit must be re-zeroed and may retain as much as a ±0.5% full-scale shift.
- Calibration and restrictor replacement should be performed by trained personnel.
Documentation Downloads
Local PDF copiesPart Photos
4 imagesHistorical archive images for identification, labels, connectors, and condition reference, not current inventory.
Historical Listings & Prices
Historical listing data, not a current offerThe typical recorded price range is $225.94 to $469.54. Based on 2 archived listing records; not a current offer, appraisal, or confirmed sale price.
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