Introduction

Congratulations on the purchase of your new E-A-RTONE®3A Insert Earphones. Whether you are performing hearing screening in an educational or industrial setting, testing related to the fitting or evaluation of amplification, audiological research, or comprehensive diagnostic assessment, E-A-RTONE®3A Insert Earphones provide many advantages that can enhance test reliability and minimize or eliminate problems frequently encountered with supra-aural headphones.

Because the subject’s external canal is sealed with an E-A-RLINK®foam plug, which functions as a sound delivery system while at the same time attenuating ambient noise, reliable threshold measurement can be accomplished in environments previously unsuitable for hearing testing.

Direct coupling also produces much greater sound separation between ears across the test frequency range. Clinically, that means more instances where the need for masking is eliminated, or the level necessary for effective masking is lower. Your average testing time will decrease without sacrificing reliability. The method of clinical masking you use does not need to be altered. Simply substitute the greater inter-aural attenuation values cited in the Obtained Interaural Attenuation table in section 1. of this booklet.

E-A-RLINK®foam plugs are available from your distributor in three sizes; a standard (3A) plug that will comfortably fit most adult ear canals, a pediatric (3B) size for small canals, and an extra large (3C) size for very large or surgically altered ear canals. Disposable plugs also insure that sanitary conditions exist for each of your patients, and that periodic cleaning of a headband or cushion is no longer required.

The E-A-RTONE®3A Insert Earphone is offered with three levels (10V, 50V, & 300V) of impedance to match the output of most commercially available audiometers. Your distributor or Auditory Systems can help you determine which version is appropriate for your equipment.

E-A-RTONE®3A Insert Earphones were designed to mimic the frequency response of the TDH type earphone. It is strongly recommended, however, that the (RETSPL) values and procedure cited in the ANSI S3.6 - 1996 Standard be used in recalibration, before initial use, unless your audiometer was purchased with an E-A-RTONE®3A as the standard transducer, and at least annually thereafter. Measured correction factors can be applied in those cases where it is necessary to alternate between an insert earphone and a supra-aural earphone.

This instruction booklet is intended to provide information to allow you to perform hearing testing with your audiometer and E-A- RTONE® 3A Insert Earphones with the confidence that results will be comparable to, or in certain instances more reliable than, measurements performed with supra-aural headphones. Most questions regarding use and calibration of E-A-RTONE®3A Insert Earphones can be answered by reviewing this booklet and/or ANSI S3.6-1996. For information regarding replacement items, please contact your distributor or Auditory Systems Customer Service at 800/624-5955. Requests for technical assistance, or comments regarding E-A-RTONE®3A Insert Earphones and E-A-RLINKS®should be directed to Aearo Company Auditory Systems at 317/692-6550.

E-A-RTONE 3A specifications

The AOSafety E-A-RTONE 3A is an advanced respiratory protective device designed for individuals working in environments where airborne hazards are present. Renowned for its effectiveness and comfort, the E-A-RTONE 3A is a favored choice among professionals in various industries, including construction, manufacturing, and chemical handling.

One of the standout features of the AOSafety E-A-RTONE 3A is its high filtration efficiency, which is crucial for providing reliable protection against particulate matter, dust, and other harmful airborne substances. The respirator is equipped with P100 filters that capture at least 99.97% of airborne particles, making it suitable for use in environments with higher levels of hazardous dust and aerosols.

The design of the E-A-RTONE 3A emphasizes user comfort, allowing for prolonged wear without discomfort. The adjustable head straps ensure a secure fit, while the soft, foam-rubber face seal conforms to the contours of the wearer’s face, reducing leakage and providing a tight seal against contaminants. This ergonomic design minimizes fatigue, enabling users to maintain focus on their tasks without the distraction of an uncomfortable respirator.

The E-A-RTONE 3A is also designed for versatility. It can accommodate various filter and cartridge types, depending on the specific requirements of the work environment. This adaptability makes it a go-to choice for users who may encounter different types of hazards or who work across various settings.

In addition to its protective features, the AOSafety E-A-RTONE 3A boasts an easy-to-use exhalation valve. This mechanism minimizes heat and moisture buildup inside the respirator, enhancing overall comfort during extended use. The valve facilitates exhalation while preventing the ingress of contaminants, thereby maintaining a clear respiratory path.

Moreover, the lightweight construction of the E-A-RTONE 3A ensures that it does not add unnecessary strain on the wearer. It’s designed to facilitate ease of movement, which is essential in active work environments. Users can wear it alongside safety goggles and other personal protective equipment, making it a versatile asset in any safety attire.

Overall, the AOSafety E-A-RTONE 3A combines high-efficiency filtration, comfort, and versatility, making it an excellent choice for anyone seeking reliable respiratory protection in potentially hazardous environments. Whether for professional use or DIY projects, this respirator stands out for its commitment to safety and user satisfaction.