Description
Simplex 4098-5601 Conventional Optical Detector Head
The Simplex 4098-5601 Conventional Optical Detector Head provides reliable fire detection for compatible Simplex conventional fire alarm systems. It features advanced optical sensing technology, automatic sensitivity compensation, and a low-profile plug-in housing. In addition, its magnetic functional test capability supports convenient inspection and maintenance.
Designed for professional life-safety installations, this detector head connects to compatible two-wire or four-wire mounting bases.
Advanced Optical Fire Detection
The Simplex 4098-5601 uses a light-scattering sensing chamber to monitor airborne particles associated with developing fire conditions.
When particles enter the sensing chamber, they change the light-scattering pattern inside the device. An onboard microprocessor evaluates this information and determines whether an alarm condition exists.
As a result, the detector can initiate an alarm through a compatible conventional initiating device circuit.
This technology supports reliable detection while helping reduce unwanted alarms.
Automatic Sensitivity Compensation
The detector includes automatic sensitivity compensation to maintain consistent operation as environmental contamination gradually accumulates.
Over time, dust and dirt can affect the sensing chamber. However, the onboard monitoring system compensates for gradual changes within its designed operating limits.
Moreover, the detector can identify when contamination approaches the compensation limit.
Therefore, maintenance personnel can recognize conditions that require attention.
Magnetic Functional Testing
The Simplex 4098-5601 supports magnetic functional testing.
A qualified technician can use an appropriate test magnet to initiate the detector’s test sequence.
During testing, the status LED provides diagnostic indications. These indications help identify normal operation or conditions requiring cleaning or service.
Consequently, technicians can perform routine functional checks without disassembling the detector head.
Low-Profile Plug-In Design
The detector features a compact housing designed for approved indoor installations.
Its plug-in construction allows the head to attach to a compatible mounting base.
Therefore, technicians can remove or replace the sensing unit without disconnecting the base wiring.
This design simplifies maintenance and replacement in existing fire alarm systems.
The mounting base is sold separately unless the product listing specifically states otherwise.
Key Features
- Conventional optical fire detector head
- Simplex 4098 Series
- Advanced light-scattering sensing chamber
- Onboard microprocessor
- Automatic sensitivity compensation
- Contamination monitoring
- Magnetic functional testing
- Red LED status indication
- Low-profile plug-in construction
- Compatible two-wire mounting bases
- Compatible four-wire mounting bases
- Low standby current
- Flame-retardant plastic housing
- Approved indoor applications
- Optional remote alarm indication
- Compatible auxiliary relay base options
- Designed for professional fire alarm installations
Conventional Fire Alarm Compatibility
The Simplex 4098-5601 is a conventional device rather than an individually addressable detector.
It operates through a compatible initiating device circuit and mounting base.
For two-wire installations, the documented operating voltage is 10.5 to 33 VDC.
Meanwhile, compatible four-wire installations use a rated voltage range of 15 to 32 VDC.
Therefore, installers must verify the control panel and base configuration before installation.
Compatible Mounting Bases
The detector supports several Simplex mounting bases, including the 4098-5261 and 4098-5207 two-wire bases.
Additional compatible options include the 4098-5680 and 4098-5682 relay bases.
These accessories provide different wiring and installation configurations.
However, technicians must confirm that the selected base matches the fire alarm control panel and approved system design.
Environmental Operating Requirements
The detector operates in ambient temperatures from 32°F to 100.4°F (0°C to 38°C).
It supports relative humidity from 10% to 95%, non-condensing.
In addition, the specified air velocity range extends from 0 to 2,000 feet per minute.
The housing uses flame-retardant ABS or PC-ABS material.
These specifications support approved indoor commercial and institutional installations.
Typical Applications
This optical detector head supports compatible fire alarm systems in a variety of buildings.
Typical applications include offices, schools, hotels, healthcare facilities, retail properties, warehouses, and other approved indoor environments.
Its removable design also makes it useful for maintaining existing Simplex installations.
Installation and Maintenance
Before installation, verify the control panel, mounting base, wiring configuration, and environmental conditions.
Also, inspect the detector head for damage, contamination, and correct identification markings.
Qualified fire alarm professionals should install and test the device according to Simplex instructions and applicable fire alarm codes.
Overall, the Simplex 4098-5601 provides dependable optical fire detection for compatible conventional systems. Its automatic sensitivity compensation, magnetic testing capability, and convenient plug-in construction make it a practical choice for professional maintenance and replacement applications.



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