- 3-Fan Overhead Ionizer
Neutralizes electrostatic charges on insulators and ungrounded conductors in a 2′ x 5′ coverage area.
- Fast Decay Times (< 3 seconds at 18″)
Discharges (1000V down to 100V) both positive and negative electrostatic charges within the coverage area.
- ±3 Volt Offset Voltage Balance
Exceeds required limits of ANSI/ESD S20.20 and ESD TR53.
- Dedicated High Voltage Power Modules with Balance Control at Each Fan
Allows each fan to be tuned to produce the optimum decay and balance in the coverage area.
- Clean Air Sealed Plenum Air Flow
Prevents contamination from being introduced to workstation.
- Steady State DC Emitters
Spaced farther apart to prevent ion recombination, increase decay efficiency, and provide a broader coverage area of ionization.
- Solid Tungsten Emitters
Maintains sharp point for optimal ionizer performance. Resists oxidation, melting and other damage that dulls the tip of the emitter.
- 9 Speed Fan (130 to 200CFM)
Consistent performance at all speeds. Low airflow may be used when working with small moving parts and components that may move with higher airflow.
- Shielded Bearings
Retains lubricant and minimizes contamination in the work area.
- Stainless Steel Housing
Minimizes foreign objects debris, corrosion, and other contaminations when used in clean or sensitive areas.
- SIM Compatible
Connect to EMIT’s SIM (Smart Ionization & Monitoring) software to monitor and record the activity of the ionizer.
- NIST Calibrated with Certificate
Calibrated with accepted procedures and standards traceable to the National Institute of Standards and Technology.
- Made in the United States of America
*US Patent 6,205,408
Description: The patented* EMIT Overhead Zero Volt Ionizer (ZVI) is a steady-state DC auto-balancing ionizer with integrated closed-loop feedback. It combines the effectiveness of steady-state DC ionization with ease of adjustability, communication capability and the flexibility of a microcontroller-based design to produce a versatile and stable ionization system. Its fans produce extended ionization coverage and are ideal for areas where bench space is limited.
The Overhead Zero Volt Ionizer utilizes Steady State DC ionization. Steady State DC systems consist of separate negative and positive ion emitters connected by a pair of high-voltage cables to their respective high-voltage power supplies. The spacing between emitters varies depending on the design, and DC power is constantly applied to the emitter points. The ionizer utilizes feedback from the internal sensor grill to continuously adjust the output to maintain balance.
“Necessary non-conductors in the environment cannot lose their electrostatic charge by attachment to ground. Ionization systems provide neutralization of charges on these necessary non-conductive items (circuit board materials and some device packages are examples of necessary non-conductors). Assessment of the ESD hazard created by electrostatic charges on the necessary June 2015 Item Fans Voltage CSA Approved Power Cord 50664 2 120 VAC Yes North America 50665 3 120 VAC Yes North America 50671 2 220 VAC No None 50672 3 220 VAC No None nonconductors in the work place is required to ensure that appropriate actions are implemented, commensurate with risk to ESDS [ESD sensitive] items”. (ANSI/ESD S20.20- 2007 Foreword)
“In order to mitigate field-induced CDM [Charged Device Model] damage, the ESD program shall include a plan for the handling of process-required insulators. If the field exceeds 2,000 volts/inch, steps shall be taken to either: A) Separate the insulator from the ESD-sensitive device by a distance of 30 cm (12 inches); or B) Use ionization or other charge mitigating techniques to neutralize the charge.” (ANSI/ESD S20.20-2007 section 8.3)
“The primary method of static charge control is direct connection to ground for conductors, static dissipative materials, and personnel. A complete static control program must also deal with isolated conductors that cannot be grounded, insulating materials (e.g., most common plastics), and moving personnel who cannot use wrist or heel straps or ESD control flooring and footwear.
Air ionization is not a replacement for grounding methods. It is one component of a complete static control program. Ionizers are used when it is not possible to properly ground everything and as backup to other static control methods. In clean rooms, air ionization may be one of the few methods of static control available.” (ESD Handbook ESD TR20.20 Ionization, section 188.8.131.52)
Maintenance “All ionization devices will require periodic maintenance for proper operation. Maintenance intervals for ionizers vary widely depending on the type of ionization equipment and use environment. Critical clean room uses will generally require more frequent attention. It is important to set-up a routine schedule for ionizer service. Routine service is typically required to meet quality audit requirements.” (ESD Handbook ESD TR20.20 section 184.108.40.206 Maintenance / Cleaning)
EIA-625, recommends checking ionizers every 6 months, but this may not be suitable for many programs particularly since an out-of-balance may exist for months before it is checked again. ANSI/ESD S20.20 section 220.127.116.11 Compliance Verification Plan Requirement states: “Test equipment shall be selected to make measurements of appropriate properties of the technical requirements that are incorporated into the ESD program plan.”
Cleaning the Emitter Points Under normal conditions, the ionizer will attract dirt and dust (especially on the emitter points). To maintain optimum neutralization efficiency and operation, cleaning should be performed on a regular basis. The emitter points should be cleaned using the included Emitter Point Cleaners or a swab dampened with Isopropyl alcohol.
The emitter points should not require replacement during the life of the unit with normal handling. If necessary, item 50659 Replacement Emitter Points are available for purchase.
EMIT SIM Software The EMIT Overhead Zero Volt Ionizer is compatible with EMIT SIM Software. EMIT SIM provides a platform to monitor and record the activity of your EMIT Smart Products. Save costs by using EMIT SIM to eliminate the need to rely on people to physically check the status of monitors and ionizers every day. This software also features tools for generating activity reports and calibration / maintenance schedule management.
Adjustments and Compliance Verification BALANCE OFFSET VOLTAGE ADJUSTMENT The Overhead Zero Volt Ionizer is an auto-balancing unit. However, tuning or manual adjustment can be accomplished by using the ionizer’s control buttons. See “Operation” for more information.
Auto-balancing closed-loop feedback technology can save money and extend the maintenance interval of the ionizer. What the sensor detects is that the offset voltage (balance) has shifted and the circuits will attempt to compensate. In the case of corona ionizers, one of the reasons for a shift in offset voltage is frequently the particle buildup, commonly called a “fuzz ball”, observed on the emitter points.
Compliance Verification should be per ESD TR53. Offset voltage (balance) and both polarity’s discharge time should be checked on every ionizer periodically using an Ionization Test Kit or a Charged Plate Analyzer. Measure offset voltage (balance) and both polarity’s discharge times. Clean the emitter points (with electrical power off), adjust offset voltage (balance) to zero and then re-test for offset voltage (balance) and discharge times recording the measurements.
Specifications The comparative efficiency of overhead ionizers is determined by a standard test published by the ESD Association: ANSI/ESD STM 3.1. Typical positive and negative discharge times (1000V – 100V) measured using this standard are shown in the “Neutralization (Discharge) Times” section. The performance of the ionizer was measured with the unit positioned as shown, with the fan speed on high and without a filter.
Air Flow 50664, 50671 – Nine speed fan (130 cfm – 200 cfm) 50665, 50672 – Nine speed fan (195 cfm – 300 cfm)
Balance (offset voltage) ±3 Volts Typical ±5 Volts Maximum (Temperature Range: 65°F – 80°F, RH: 15% – 65%)
Chassis Stainless steel Dimensions 50664, 50671 – 3.9″ H x 6.6″ W x 27.3″ L (9.9cm H x 16.8cm W x 69.3cm L) 50665, 50672 – 3.9″ H x 6.6″ W x 42.3″ L (9.9cm H x 16.8cm W x 107.4cm L)
Emitter Points 0.050″ diameter Made of pure tungsten for improved mechanical strength and ionization stability.
Fuse 400mA slow blow High Voltage Power Supply 5.5kV DC nominal Input Power AC line power Internally selectable for 100/120 VAC – 50/60Hz or 220/230 VAC – 50/60Hz
Ion Emission Steady-state DC with sense feedback Mounting May be rigid-mounted or suspended from ceiling
Ozone < 0.05 ppm Weight 50664, 50671 – 7 lbs (3.2 kg) 50665, 50672 – 10 lbs (4.5 kg)