Gast DOA-P504-BN Dual-Head Oil-Free Vacuum and Pressure Pump

Overview

The Gast DOA-P504-BN is a dual-head, oil-free diaphragm pump engineered for continuous-duty laboratory and light industrial applications requiring simultaneous or independent vacuum and positive pressure generation. Utilizing a robust, brushless, shaded-pole motor with integrated thermal overload protection, this pump eliminates the risk of motor burnout under sustained load or transient backpressure conditions. Its dual-head parallel configuration doubles volumetric displacement—achieving up to 2.2 cfm (62.3 L/min) at standard conditions—while maintaining stable performance across variable system impedances. Unlike rotary vane or piston pumps, the DOA-P504-BN operates without lubricating oil, ensuring contamination-free airflow critical for analytical sample handling, glove box purging, filtration systems, and vacuum drying ovens. The pump’s sealed architecture and elastomer-composite diaphragms (Nordel® EPDM and Nomex® reinforced) provide chemical resistance to alcohols, esters, and mild aqueous vapors, supporting compliance with ISO 8573-1 Class 0 air purity requirements for non-oil-lubricated systems.

Key Features

• Dual-head parallel design delivers 2.2 cfm (62.3 L/min) free-air displacement—ideal for high-flow vacuum filtration, rapid chamber evacuation, or dual-path process control
• Oil-free operation ensures zero hydrocarbon carryover; meets stringent requirements for GC sample introduction, lyophilizer condenser purge, and cleanroom-compatible instrumentation
• Shaded-pole motor with automatic thermal cut-off protects against coil overheating during extended duty cycles or inlet restriction events
• Integrated inlet filter and acoustic muffler reduce particulate ingress and ambient noise to 68 dB(A), enabling placement in shared lab environments
• Wetted materials include anodized aluminum housing, 316 stainless steel valve plates, Nordel® EPDM diaphragms, and Nomex®-reinforced reinforcement layers—validated for compatibility with IPA, acetone, and buffered saline solutions
• Standard 1/4″ NPT(F) vacuum/pressure ports and 3/8″ hose barb fittings support direct integration with common lab tubing, regulators, and pressure gauges
• UL Recognized and CE-marked construction complies with IEC 61000-6-3 (EMC) and IEC 61000-6-2 (immunity) standards for laboratory equipment

Sample Compatibility & Compliance

The DOA-P504-BN is designed for use with non-corrosive, non-explosive gases and low-concentration vapor streams typical in academic, pharmaceutical QC, and materials science laboratories. It is not rated for chlorine, hydrogen sulfide, ammonia, or strong oxidizers. Its wetted material set conforms to USP Class VI biocompatibility testing for elastomers and passes ASTM D471 fluid resistance protocols for Nordel® compounds. When operated within its specified vacuum range (up to 25.5″ Hg) and pressure limit (60 psi), the pump supports GLP-aligned documentation workflows—its consistent flow stability enables traceable method validation per ASTM D3924 (vacuum system performance) and ISO 2787 (pneumatic equipment testing). No internal lubricants eliminate the need for scheduled oil changes, reducing maintenance logs required under FDA 21 CFR Part 11-compliant quality systems.

Software & Data Management

As a standalone electromechanical device, the DOA-P504-BN does not incorporate embedded firmware, network interfaces, or digital control modules. It functions as an analog actuator compatible with external process controllers, PLCs, or data acquisition systems via simple on/off dry-contact signaling or 0–10 VDC analog feedback (when paired with optional pressure transducers). For audit-trail compliance in regulated environments, users may integrate the pump into validated SCADA architectures using third-party pressure/vacuum sensors (e.g., Validyne DP15 or Omega PX409 series) that support 4–20 mA output and NIST-traceable calibration certificates. All mechanical adjustments—including regulator setpoints and relief valve thresholds—are manually calibrated and documented per facility SOPs, supporting GMP Annex 11 alignment when paired with electronic logbook systems.

Applications

• Rapid evacuation of desiccators, vacuum ovens, and solvent recovery flasks in organic synthesis labs
• Positive-pressure supply for membrane filtration manifolds, sterile air curtains, and inert gas blanketing of reaction vessels
• Continuous-duty operation in environmental monitoring stations requiring stable vacuum for particulate sampling pumps (e.g., EPA Method 5 and ISO 10112)
• Supporting automated liquid handling platforms where pulsation-free, oil-free airflow is mandatory for syringe actuation and valve sequencing
• Vacuum-assisted degassing of polymer resins and composites prior to curing in R&D prototyping facilities
• Backup or redundancy pumping for larger central vacuum systems during maintenance outages

FAQ

Is the DOA-P504-BN suitable for vacuum distillation applications?

Yes—provided the vapor load remains below saturation limits for Nordel® and the process temperature stays below 60°C. Condensable vapors must be trapped upstream using cold traps or scrubbers to prevent diaphragm swelling.
Can this pump generate deep vacuum for mass spectrometry sample introduction?

No—it achieves a maximum vacuum of 25.5″ Hg (~120 mbar abs), which is insufficient for high-vacuum MS ion sources. It is appropriate for roughing pumps or foreline support in hybrid vacuum trains.
What maintenance intervals are recommended for routine operation?

Diaphragms and valves should be inspected every 6,000 operating hours or annually—whichever occurs first. Replacement kits (Gast P/N 101-1000) include all wear components and torque specifications per OEM service bulletin SB-DOA-2023.
Does the pump comply with energy efficiency regulations such as DOE 10 CFR Part 431?

While not classified as a “covered product” under that regulation, its shaded-pole motor meets IE1 efficiency levels per IEC 60034-30-1 and consumes ≤125 W at full load—within typical lab equipment power budgets.
Can the DOA-P504-BN be mounted vertically or inverted?

Yes—its oil-free design permits any orientation. However, inlet and exhaust ports must remain unobstructed, and ambient temperature must not exceed 40°C to maintain thermal protection integrity.