Silent Knight SK-MONITOR-2 Dual Monitor Module

The Silent Knight SK-MONITOR-2 Dual Monitor Module provides two independently monitored input circuits for compatible addressable fire alarm systems. It allows a Silent Knight control panel to monitor contact devices such as waterflow switches, pull stations, and supervisory devices. In addition, each input uses its own unique address for individual identification at the fire alarm control panel.

Dual Input Monitoring

The Silent Knight SK-MONITOR-2 provides two independent 2-wire initiating device circuits. Each circuit operates at a separate consecutive address. Therefore, one module can monitor two different input circuits while allowing the control panel to identify each input individually.

The module can monitor normally open contact fire alarm and supervisory devices. It can also monitor normally open or normally closed security devices when used in an approved system configuration.

Class B Initiating Device Circuits

Both initiating device circuits support NFPA Style B, or Class B, operation. Each input uses a 47kΩ end-of-line resistor for circuit supervision.

The module continuously supervises the connected wiring. Therefore, the fire alarm control panel can monitor the condition of each circuit and respond to changes from connected devices.

Addressable SLC Operation

The module connects to a compatible Silent Knight SLC. Two rotary address switches allow technicians to select the module addresses during installation.

Because the two inputs use consecutive addresses, installers set the starting address for the device according to the system design. As a result, both monitored circuits can report independently to the control panel.

Key Features

• Addressable dual input monitor module
• Two independent initiating device circuits
• Two separate consecutive addresses
• Class B supervised input wiring
• 47kΩ end-of-line resistance
• Monitors normally open fire alarm contacts
• Supports supervisory contact devices
• Suitable for waterflow switches
• Suitable for manual pull stations
• Rotary address switches
• Single panel-controlled red status LED
• 15 to 32 VDC operating voltage
• Low standby current
• SEMS screws for convenient field wiring
• Mounts to a standard 4-inch square electrical box
• Ivory cover plate
• UL Listed
• CSFM Approved
• City of New York Approved

Electrical Specifications

The Silent Knight SK-MONITOR-2 operates from 15 to 32 VDC. Its average operating current is approximately 750µA, while the maximum current draw reaches approximately 6.4mA with the LED illuminated.

The maximum SLC wiring resistance is 40Ω. In addition, the maximum IDC wiring resistance is 1,500Ω.

Each IDC supports a maximum voltage of approximately 11.7V and a maximum current of approximately 240µA. The specified end-of-line resistance is 47kΩ.

LED Status Indication

A panel-controlled red LED provides local status indication. During normal communication, the LED can flash as the control panel communicates with the module.

During an active condition, the panel can illuminate the LED continuously. Therefore, technicians can quickly identify an active module during inspection, troubleshooting, or system testing.

Compatible Silent Knight Panels

The module supports several Silent Knight addressable fire alarm control panels. Published compatible models include the 6820, 6820EVS, 6808, 6700, 5700, 5808, 5820XL, and 5820XL-EVS.

However, technicians should always verify panel firmware, SLC protocol, and system compatibility before installing a replacement module.

Dimensions and Environmental Specifications

The module measures approximately 4.5 inches high × 4 inches wide × 1.25 inches deep. It mounts directly to a standard 4-inch square electrical box with a minimum depth of 2-1/8 inches.

The operating temperature range extends from 32°F to 120°F (0°C to 49°C). In addition, the module supports 10% to 93% relative humidity in non-condensing environments.

An SMB500 surface-mount electrical box is also available for compatible installations.

Typical Fire Alarm Applications

This dual monitor module can support many commercial and institutional fire alarm applications. For example, installers can use it to monitor waterflow switches, manual pull stations, supervisory switches, and other compatible dry-contact devices.

The dual-input configuration can also reduce the number of individual modules required in an installation. Therefore, it provides a convenient solution when two independently addressed monitored inputs are needed in the same area.

Installation and Compatibility

Always verify fire alarm control panel compatibility, SLC addressing, IDC wiring, end-of-line resistance, and connected device requirements before installation.

Qualified fire alarm professionals should install, address, program, and test the module. In addition, technicians should follow Silent Knight installation instructions and applicable fire alarm requirements.

Overall, this Silent Knight dual monitor module provides a practical way to monitor two independent input circuits from one physical module. Its dual addressing, Class B supervision, rotary switches, compact design, and compatibility with multiple Silent Knight panels make it useful for maintaining compatible legacy fire alarm systems.

SK-MONITOR-2 Datasheet