3M 991 Instructions Manual
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Overhead Air Ionizer 991
Instructions
November 2006
78-9100-1135-8
Table of Contents
Safety Information ......................................................................................................................3
1.0 Description .............................................................................................................................4
Overview .......................................................................................................................................4
Performance ..................................................................................................................................4
2.0 Installation .............................................................................................................................6
Supplied Parts ...............................................................................................................................6
Mounting .......................................................................................................................................6
Power Plug Connection .................................................................................................................7
Multiple Ionizers - Interconnection ..............................................................................................7
3.0 Operation ...............................................................................................................................8
Operation .......................................................................................................................................8
Fault Indicator ...............................................................................................................................8
Alarm Output Jack ........................................................................................................................8
4.0 Maintenance ..........................................................................................................................9
Cleaning Solution..........................................................................................................................9
Chassis Cleaning ...........................................................................................................................9
Air Filters Cleaning .......................................................................................................................9
Emitter Points Cleaning ..............................................................................................................10
Auto-Clean System Use ..............................................................................................................10
5.0 Specifications .......................................................................................................................11
Properties and Typical Values .....................................................................................................11
Dimensional Drawing .................................................................................................................12
6.0 Accessories ...........................................................................................................................12
7.0 Customer and Technical Service ........................................................................................12
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Safety Information
Read, understand, and follow all safety information contained in these instructions prior to installation and use
of the 3M™ Overhead Air Ionizer 991. Retain these instructions for future reference.
Intended Use
The 3M Overhead Air Ionizer 991 is designed to neutralize static charge on non-conductive objects and work
surfaces in an electronics manufacturing environment. It is intended to function as a stand alone device. The
ionizer is not intended to replace proper grounding of personnel. The product is designed for indoor use only
and has not been tested or proven safe for other uses.
Explanation of Signal Word Consequences
WARNING:
CAUTION:
Indicates a potentially hazardous situation, which, if not avoided, could result in
death or serious injury and/or property damage.
Indicates a potentially hazardous situation, which, if not avoided, may result in
property damage.
WARNING
To reduce the risk associated with hazardous voltage due to a user or installer attempting to service the 3M
Overhead Air Ionizer 991:
• Do not remove the grills or disassemble the unit. The ionizer has no user serviceable parts. Contact 3M Customer
Service Department if service is required. Unauthorized service will void the warranty.
• Before cleaning any part of the ionizer, make sure that the unit is turned OFF and the power cord is disconnected
from the power source.
To reduce the risk associated with hazardous voltage due to the Ionizer 991 being used in wet locations:
• Do not use this product outdoors. Rain or moisture may increase risk of electrical shock.
To reduce the risk associated with fire due to use of the Ionizer 991 in explosive or potentially explosive
environments:
• Do not use this product in an explosive or potentially explosive environment. This product is not designed to be
intrinsically safe. Arcing between emitter points can occur.
To reduce the risk associated with fire due to use of incorrect power connections for single or multiple
Ionizer 991 units:
• Do not daisy-chain more than 10 units. The power cord used to connect between each unit must be constructed of
#18 AWG (0.8 mm²) 3-conductor cable, maximum length 12 inches (30.47 cm).
• Use of extension cords is not recommended.
CAUTION:
To reduce the risk associated with property damage due to use of the Ionizer 991 being used in place of
proper ESD grounding procedures for personnel:
• Use of the 3M Overhead Air Ionizer 991 is not intended to replace proper grounding of personnel.
Explanation of Symbols
Refer to Instruction Manual
High Voltage Present inside Unit
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1.0 Description
Overview
The 3M™ Overhead Air Ionizer 991 neutralizes static over bench top areas without occupying valuable work
space. The Ionizer 991 operates with steady-state DC ion emission that provides fast discharge with low airflow.
Emitter points are placed behind the fan to eliminate field-induced charge and to ensure a homogenous mixture
of ionized air. The Ionizer 991 is available in the following configurations:
98-0798-5683-1 Overhead Air Ionizer 991 with North America Power Cord
98-0798-5684-9 Overhead Air Ionizer 991 with UK Power Cord
98-0798-5694-8 Overhead Air Ionizer 991 with Germany Power Cord
98-0798-5695-5 Overhead Air Ionizer 991 with China Power Cord
Features of the 3M Overhead Air Ionizer 991:
• Length: 44 inches (111.8 cm)
• Fans: 3
• Fan Speeds: High and low (switched high, low, & OFF)
• Protective Fan Filters: Open-cell foam filters on fan intakes protect the internal components from
environmental contamination.
• Bi-Color Red/Green Indicator LED: Illuminates green when power is applied to the ionizer and the unit is
turned to low or high fan speed; illuminates red when high voltage power supply failure has occurred.
• Auto-Clean System: Brush mechanism installed on each fan, sweeps the emitter points during start up
and shut off operation of the ionizer. This feature reduces the frequency of required manual emitter point
cleanings as outlined in Section 4.0 of this manual. During full operation of the fan, the brush retracts to
prevent wearing the emitter points.
Performance
Discharge time tests indicate less than or equal to 8 seconds (1000V to 100V) directly under each of the fans.
Note: Testing performed with the unit mounted 24 inches above the work surface and fans at high speed using
a charged plate monitor in accordance with the ESD Association Ionization Standard ESD STM3.1-2000.
In a constant temperature/humidity environment, the 3M
less than or equal to ±20V.
There is a direct relationship between the distance the unit is installed from the work surface, the area of
coverage, and the discharge time measured at the work surface. Generally, the greater the mounting distance
from the work surface, the greater the area of coverage will be, and the longer the discharge time will be
(Fig. 1 & Table 1).
The unit's internal emitter points are electrostatically shielded to eliminate field-induced charging. Steady-state
DC ion emission provides fast discharge with low airflow for greater operator comfort. The ionizer never needs
calibration and requires very little maintenance. The technology is based on a law of physics, Conservation of
Charge, which states that charge cannot be created or destroyed in an isolated system. By isolating the ionizer’s
emitter points from ground, it ensures equal numbers of positive and negative ions.
Overhead Air Ionizer 991 will maintain a balance of
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