ProReact Digital Interface Units
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
Two zones of ProReact Digital Linear Heat Detection cable can be connected to a ProReact Digital Interface Monitor Module.
Yes, each zone (or “run”) of digital linear heat detection cable should be connected to an end of line unit.
Yes, all Thermocable's control or interface units require a 24V power supply.
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.
UL approval has been granted for two versions of control unit. One is a self-contained unit or, for finer control, a version requiring a laptop prevents uninvited system access via a software programme.
Functional testing of digital linear heat detection by heating a section of cable up until an alarm is initiated is an effective method but can be costly as the section of cable must be replaced following the test.
Alternatively, it is possible to undertake a test using Thermocable's ProReact Digital EOL unit with Test Facility (SKU: A1385). This unit allowed a functional test to be carried out on the zone of digital LHD cable to verify normal, trouble and alarm functions of the system by simulating a break in the cable or a overheat condition.
Please get in touch with us if you require further clarification on testing a digital linear heat detection system.
Thermocable’s ProReact Digital Interface Monitor Module and the ProReact Digital Sensor Control Unit require a 24V power supply.
The recommended ambient operating temperature range is between -20°C and +50°C (-4°F – +122°F).
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)
