Radiologgers:

rl2001 single zone flood detection transmitter

The 1 zone Flood Alarm is a radio transmitter connected to a highly responsive flood detection cable. This cable can be run along key areas enabling rapid notification of water leakage before serious damage is done.

The flood cable consists of eight cores wrapped around a central strain relief plastic core to provide some rigidity. Of the eight cores, two are the conductors. These are uninsulated copper so, if the cable is wetted, they short and provide an alarm signal. The cable is sheathed in a black plastic overbraid to keep the cores in place and prevent the conductors shorting on any metal surfaces the cable may run over.

A connection box terminates the flood cable which is then wired into the transmitter body using normal 2-core signal cable. This allows the transmitter to be located in a good radio position without running the specialist cable down walls or along floors which do not require flood monitoring. The signal cable is connected to the transmitter using a 2-pin Lemo plug.

When the flood cable is shorted by water, the transmitter unit immediately sends a change of state signal six times to the receiving equipment. This multiple transmission is to ensure the signal is received straight away. On the Radiolog for Museums software, the alarm will immediately appear on the live data view. The transmitter then checks the state of the flood cable and re-transmits its current state back to the software.

Optionally, the Radiolog for Museums system can be fitted with an alarm relay which triggers an autodialler, for out of hours instant notification via phone message or SMS, or a software add-in can send email/SMS notifications.

The obvious inherent advantages of the Flood Alarm are low installation costs with a minimal wiring requirement and reduced risk of disruption or damage to what, usually, are historically sensitive buildings. Each sensor is powered by its own internal battery, which lasts 18 months and is easily replaced. A “battery low” indication is displayed on the software, warning of the requirement for battery change prior to complete power loss. A failure in transmission is also flagged by the software.

The 1-zone Flood Alarm comprises an ml-2000 transmitter body fitted with one input channel, 5m of flood cable as standard plus a 5m connecting cable to the flood cable connection box. Longer flood cables are available – simply specify the length required when asking for a quote.

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