Bantam Series Port Sizes 1/8 & 1/4; Flow to 11 scfm (312 l/min)

Product Overview

The ROSS Controls Bantam Coalescing Filter is a compact, high-efficiency air preparation unit engineered to remove liquid water, oil aerosols, and sub-micron particulate contamination from compressed air systems. Designed for port sizes 1/8 and 1/4 with maximum flow to 11 scfm (312 l/min), the Bantam Series occupies minimal panel or manifold real estate while delivering rigorous filtration performance in light industrial, laboratory, instrumentation, and small-bore pneumatic applications.

Available with a standard 0.3-micron rated borosilicate glass-fiber coalescing element or an optional 0.01-micron rated ultra-fine element, the series traps aerosols that standard particulate filters cannot capture. The coalescing mechanism forces sub-micron droplets to merge into larger droplets that drain by gravity into the bowl, where an automatic or manual drain expels the collected liquid from the system.

The modular assembly design allows Bantam Series coalescing filters to be combined with ROSS regulators and lubricators for complete FRL air preparation. Connection options include threaded NPT or BSPP ports and push-in quick-connect tube fittings for tubing up to 10 mm in diameter, providing installation flexibility in tight spaces. The high-strength polycarbonate bowl provides visual inspection of the liquid level, while the optional aluminum bowl extends the pressure and temperature rating for more demanding environments.

Engineers specifying air preparation for pneumatic instruments, miniature cylinders, solenoid pilot valves, or any system where oil contamination or water carry-over must be eliminated will find the Bantam Series coalescing filter to be a reliable, space-efficient solution that integrates cleanly into modular FRL assemblies.

Key Engineering Features

• 0.3-Micron Rated Borosilicate Glass-Fiber Element - Standard element removes aerosols, liquid water, and compressor oil carryover at the 0.3-micron rating, protecting downstream instruments and components from contamination.
• Optional 0.01-Micron Ultra-Fine Element - Available for applications demanding near oil-free air, reducing aerosol oil content to levels suitable for critical instrumentation, food-grade pneumatics, and electronics manufacturing.
• Modular Assembly Compatibility - Designed for direct combination with ROSS Bantam Series regulators and lubricators using standardized porting blocks, eliminating separate pipe fittings and reducing assembly length.
• Threaded and Quick-Connect Port Options - Available with 1/8 or 1/4 NPT/BSPP threaded ports, or push-in quick-connect tube fittings for 1/4, 3/8, 4 mm, 6 mm, 8 mm, and 10 mm tubing OD, providing installation flexibility.
• Automatic or Manual Drain - Automatic drain removes collected liquid continuously without operator intervention; manual drain provides direct control in applications where periodic purging is preferred.
• High-Strength Polycarbonate or Aluminum Bowl - Polycarbonate bowl allows visual liquid-level inspection at up to 150 psig (10 bar); aluminum bowl extends the rating to 200 psig (14 bar) and 150 degrees F for higher-pressure systems.
• Compact Bantam-Scale Envelope - With a body width under 1.7 inches (43 mm) and bowl height of 3.9 inches (99 mm), the series fits in confined machine frames and panel-mounted air preparation stations.
• Acetal Body Construction - Corrosion-resistant acetal resin body resists moisture and mild chemical exposure, contributing to long service life in humid or wash-down environments.
• Nitrile Seals - Standard Nitrile seals provide reliable sealing with compressed air and petroleum-based compressor oils across the rated temperature range.

Technical Specifications

General Specifications

Certifications & Compliance

Typical Applications & Industries

Instrumentation and Process Control

• Pneumatic instrument air supply lines where oil-free, dry air is required to prevent calibration drift, valve sticking, and corrosion in positioners and transmitters. The 0.01-micron element delivers near oil-free air quality per ISO 8573-1 Class 1.
• Laboratory automation and analytical instrument pneumatic supplies where even trace aerosol contamination can compromise measurement accuracy or damage precision solenoid valves.
• Industrial control panel compressed air supplies for pneumatic relays, pilot valves, and cylinder actuators on 1/8 and 1/4 port systems that demand clean, dry air for reliable cycle life.

Semiconductor and Electronics Manufacturing

• Pneumatic handling systems for printed circuit board assembly, chip packaging, and wafer transport where oil contamination of parts or tooling is unacceptable.
• Clean-room air preparation stations providing the final coalescing stage before instrument-grade air enters sensitive pick-and-place and bonding equipment.

Food, Beverage, and Pharmaceutical

• Packaging machine air preparation in food contact zones where oil carryover from the compressor must be removed before air contacts product or packaging material, supporting compliance with food safety regulations.
• Pharmaceutical fill-and-finish equipment pneumatic supplies where ISO 8573-1 Class 1 oil-free air quality is specified to prevent product contamination.

Automotive and Assembly Automation

• Miniature pneumatic cylinder and gripper supplies on assembly cells where compressor oil in the air would contaminate adhesives, sealants, or painted surfaces.
• Pneumatic leak test rigs requiring dry, clean air to prevent false readings caused by water or oil vapor condensation in test fixtures and pressure references.

General Industrial and OEM Equipment

• Air knife and air wipe systems on printing, laminating, and web-handling machines where oil-contaminated air would deposit residue on product surfaces.
• Modular FRL stations on multi-axis pneumatic machines where the Bantam form factor is required to fit within compact machine frames or on individual axis air preparation manifolds.

Ordering and Model Number Configuration

For BSPP (G) thread ports, add a 'C' prefix to the model number (e.g., C5B01B0700).

Standard element rating is 0.3 micron. To order the 0.01-micron element, specify optional element model R-A-10F-16E8 as a separate line item or consult ROSS for factory-built configurations.

Accessories including mounting brackets and coupling kits are ordered separately.

Modular configurations combining coalescing filter, regulator, and lubricator use ROSS porting block kits to eliminate intermediate pipe fittings.

Related Products & Accessories

• 79 Miniature Series Coalescing Filter - Inline-mount coalescing filter for 1/8 and 1/4 port sizes with flow to 10 scfm; aluminum body with polycarbonate or metal bowl. https://www.rosscontrols.com/en/series/79-miniature-series
• 80 Mid-Size Series Coalescing Filter - Modular or inline coalescing filter for 1/4 to 1/2 port sizes with flow to 100 scfm and differential pressure gauge. https://www.rosscontrols.com/en/series/80-mid-size-series
• Bantam Series Standard Filters (5-micron) - 5-micron and 40-micron particulate filters in the Bantam form factor for upstream prefiltration ahead of the coalescing stage. https://www.rosscontrols.com/en/categories/40-filters
• Bantam Series FRL Combination Units - Factory-assembled filter, regulator, and lubricator combinations in the Bantam Series for complete air preparation in a single modular assembly. https://www.rosscontrols.com/en/categories/44-filter-regulator-and-lubricator
• Bantam Series Regulators - Piston-type and diaphragm-type pressure regulators in the Bantam form factor for modular assembly with the series coalescing filter. https://www.rosscontrols.com/en/categories/42-regulators

Frequently Asked Questions (FAQ)

Q: What is the difference between the 0.3-micron and 0.01-micron element options?

A: The 0.3-micron element removes bulk liquid water, oil droplets, and aerosols larger than 0.3 micron, which is suitable for most general industrial compressed air applications. The 0.01-micron element provides additional aerosol oil removal approaching ISO 8573-1 Class 1 oil content, required for instrumentation, food-grade, and semiconductor applications where trace oil contamination cannot be tolerated.

Q: Can the Bantam Series coalescing filter be combined with a regulator and lubricator?

A: Yes. The Series is part of the ROSS Bantam FRL product family and is designed for modular assembly with Bantam Series regulators and lubricators using porting block coupling kits. This creates a compact, integrated FRL unit without intermediate pipe fittings.

Q: What bowl material should I select for my application?

A: Select the polycarbonate bowl for applications up to 150 psig (10 bar) and 125 degrees F (52 degrees C) where visual liquid-level inspection is desired. Select the aluminum bowl when operating pressure exceeds 150 psig, ambient temperature may reach 150 degrees F (66 degrees C), or when the installation environment includes impact risk or exposure to fluids that attack polycarbonate.

Q: What is the maximum operating pressure for the Bantam coalescing filter?

A: The maximum inlet pressure is 150 psig (10 bar) with a polycarbonate bowl and 200 psig (14 bar) with an aluminum (metal) bowl. These limits apply to both automatic and manual drain configurations.

Q: What is the maximum flow rating for the series?

A: Maximum flow is 11 scfm (312 l/min) at 100 psig (6.9 bar) inlet pressure. Flow decreases as inlet pressure decreases or as the element loads with contamination.

Q: How do I order the BSPP (G) thread version?

A: Add a 'C' prefix to the standard NPT model number. For example, model 5B02B0700 becomes C5B02B0700 for the 1/4" BSPP threaded port with automatic drain and polycarbonate bowl.

Q: How often should the filter element be replaced?

A: Replace the element when the differential pressure across the filter reaches the service indicator threshold, typically 10 psid, or at the scheduled maintenance interval established during system commissioning. Heavy aerosol loading from a poorly maintained compressor will shorten element service life.

Q: What tube OD sizes are compatible with the quick-connect fittings?

A: Quick-connect tube fittings are available for 1/4", 3/8", 4 mm, 6 mm, 8 mm, and 10 mm OD tubing. Select the model number suffix corresponding to the tubing size used in your system.

Q: Is a differential pressure gauge available for the Bantam Series coalescing filter?

A: The Bantam Series does not include an integral differential pressure gauge in the standard configuration. Element condition should be monitored by tracking system pressure drop or by establishing a time-based replacement interval. For differential pressure monitoring, consider the Mid-Size or larger ROSS coalescing filter series.

Q: What is the bowl liquid capacity?

A: The bowl capacity is 2 oz (60 ml). For applications with high condensate accumulation rates, the automatic drain option is recommended to prevent bowl overflow, which would allow liquid carryover past the element into the downstream system.

Q: Can these filters be used with gases other than compressed air?

A: The Series is rated for compressed air service. Use with other gases, including nitrogen or inert gases, requires confirmation from ROSS Controls that the seal and element materials are compatible with the specific gas and any contaminants present.

Q: What is the estimated lead time for standard Bantam coalescing filter models?

A: Standard manufacturing lead times for quantities of 10 or fewer units are typically 3 to 4 weeks, with shipping available throughout the United States. Contact ROSS Controls at (800) 438-7677 for specific lead time and availability.

Installation & Maintenance Guidelines

• Mount the filter with the bowl pointing downward to allow collected liquids to drain to the lowest point where the drain valve is located. Inverted or horizontal mounting impairs drainage.
• Supply filtered compressed air at 5-micron or better upstream if a coarser filter is not already installed. The coalescing element is not designed as a primary particulate filter and can load prematurely with heavy particulate contamination.
• Verify system operating pressure is within the rated range for the bowl type selected: up to 150 psig (10 bar) for polycarbonate bowls and up to 200 psig (14 bar) for aluminum bowls.
• When using push-in quick-connect tube fittings, ensure tubing OD is within the specified size range and tube ends are cut cleanly and squarely to ensure positive seating and sealing in the fitting.
• For automatic drain models, ensure adequate system pressure is maintained (minimum 30 psig / 2 bar) to activate the automatic drain mechanism. At pressures below this threshold, the float may not actuate properly.
• For modular assemblies, verify that coupling kits and porting blocks are properly aligned and torqued per ROSS installation instructions before pressurizing the assembly.
• Inspect the bowl liquid level during initial system commissioning and establish a service interval based on observed condensate accumulation rate. High humidity or heavily loaded compressors may require more frequent draining.
• Use only ROSS-approved replacement elements (945K77 for 0.3 micron, R-A-10F-16E8 for 0.01 micron) to maintain rated filtration performance. Non-OEM elements may not seal correctly in the element seat.
• When replacing the filter element, depressurize the filter completely before removing the bowl. Do not overtighten the bowl; follow ROSS torque specifications to avoid cracking the polycarbonate bowl.
• For installations subject to ambient temperatures below 40 degrees F (4 degrees C), specify the metal bowl option and ensure the compressed air supply is dried to a dew point below ambient to prevent ice formation in the bowl and element.

Warranty & Global Support

ROSS Controls provides a one-year warranty on all products, covering defects in material and workmanship from date of purchase.

Global technical support is available through ROSS offices in the USA (headquarters in Ferndale, Michigan), Canada, Brazil, Germany, France, United Kingdom, India, China, and Japan.

Contact ROSS Controls USA at (800) 438-7677 (1-800-GET-ROSS) or visit rosscontrols.com for product configuration, technical support, and distributor locator services.

Technical service is available at 1-888-TEK-ROSS for application engineering support and replacement parts identification.

Download Catalog: https://www.rosscontrols.com/en/series/78-bantam-series