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ProReact Digital Interface Units

Providing additional functionality to digital linear heat detection

UL approved interface units
CE and UKCA certified for European markets
Can monitor up to two zones of digital linear heat detection cable
Contains alarm point distance location enabling users to quickly locate and respond to an incident
Optional interlock mode available

ProReact Digital Interface Monitor Module

The UL approved ProReact Digital Interface Monitor Module was designed to provide additional functionality when used in conjunction with ProReact Digital, ProReact Plus Digital or ProReact VHT LHD cable. It is an optional accessory but is highly recommended given the benefits it delivers to clients.

The ProReact Digital Interface Monitor Module can monitor up to 6,000 metres of digital linear heat detection cable across two zones and contains an in-built display showing the state of each zone, including the distance in metres and feet to the alarm point if an alarm is triggered. It also includes an RS-485 Modbus RTU output for integration with a PLC or SCADA system.

An optional unique interlock/coincidence detection mode eliminates the possibility of false alarms by requiring both zones of detection cable to trigger before an alarm is transmitted.

ProReact Digital Sensor Control Unit

The ProReact Digital Sensor Control Unit (DSCU) forms part of Thermocable’s EN54 certified ProReact EN Digital LHD system and thus a ProReact Digital Sensor Control Unit is required for each system.

The ProReact Digital Sensor Control Unit can monitor up to 2,000 metres of ProReact EN Digital LHD cable across two zones.

Similar to the DiMM unit, the DSCU unit has separate fault and alarm outputs for each zone, it has a built-in LCD display which shows the state of each zone, including the distance in metres and feet to the alarm point, and an RS-485 Modbus RTU/ASCII output as standard.

What ProReact Digital Interface Units are available?

ProReact Digital Interface Monitor Module (DiMM) thumbnail image

ProReact Digital Interface Monitor Module (DiMM) SKU: A1349

Optional unit to be used with ProReact Digital, ProReact Plus or ProReact VHT LHD cable

ProReact Digital Sensor Control Unit (DSCU) thumbnail image

ProReact Digital Sensor Control Unit (DSCU) SKU: A1397

Mandatory interface unit for ProReact EN Digital LHD systems

Frequently asked questions about ProReact Digital Interface Units

What are the power requirements of the ProReact Digital Interface Units?

Thermocable’s ProReact Digital Interface Monitor Module and the ProReact Digital Sensor Control Unit require a 24V power supply.

What is the ambient operating temperature range of the ProReact Digital Interface Units?

The recommended ambient operating temperature range is between -20°C and +50°C (-4°F – +122°F).

How do ProReact Digital Interface Units connect into an input/output module or fire alarm panel?

Please see below the information for the fire and fault outputs:
Fault condition
2x Form C volt-free relay contacts (resistive, common)
Max V – 30Vac or 42.4Vdc
Max Current – 2A
Max Switching Power – 60W, 62.5VA

Fire condition
2x Optoisolated phototransistor output (resistive, common)
Max V – 35Vdc
Max Current – 80mA
Max Power Dissipation – 150mW

What is the difference between the independent and interlock modes of operation?

Independent – This is when the interface unit is used as a two zone system. When a fault or overheat condition occurs on a Digital LHD zone, the corresponding fault or alarm output respectively is triggered. The two zones operate independently and both sets of outputs should be connected to a fire alarm control panel. If the zone is not required leave the 3.6kohm resistor in the zone input terminals as supplied. In this mode, the two zones can either contain identical rated temperature Digital LHD cables or two different rated temperature Digital LHD cables.

Interlock – this mode is for applications which require a fail-safe guarantee that an alarm is only triggered when an overheat condition has been detected. This mode may also be known as coincidence detection. In this case, the same rated temperature Digital LHD cable should be attached to both zones of the interface unit. The alarm output is only activated when both Digital LHD cables trigger an alarm due to an overheat condition. If one Digital LHD cable zone input registers an alarm but the second does not, the alarm output will not be activated. This is to prevent an alarm if a mechanical or other issue has triggered one Digital LHD cable and not an overheat condition.

Can I install non-sensing (or “leader”) cable between a ProReact Digital Interface Unit and the linear heat detection cable?

Yes. In certain applications it may be desirable or necessary to use non-sensing leader cable between a ProReact Digital interface unit and Digital LHD cable. For example, if the interface unit is located some distance away from the area protected by the Digital LHD cable. This may be required if the expected ambient temperature range, or other environmental conditions, where the Digital LHD cable is to be used is greater than the maximum ambient temperature range for the interface unit.

The maximum length of leader cable that can be used per zone is dependent upon the leader cable diameter. Please contact us if you require any further information.

What are the dimensions of the ProReact Digital Interface Units?

The ProReact Digital Interface Units are IP65 rated and measured as follows:
Height: 180mm x Width: 120mm x Depth: 60.5mm (H7.1in x W4.72in x D2.38in)