If it is necessary to respond to alarms when the site is unmanned, the alarm dialer module can make telephone calls to several numbers and deliver a voice message.

The EL-019 autodialer can be programmed with a list of emergency telephone numbers. When there is a problem, the dialer calls each of the telephone numbers in turn until someone answers, then it gives a message saying that there is a problem. The dialer behaves in the same way as any normal extension and does not affect the operation of other telephones connected to the same line.

The EL-019 is only suitable for use with UK phone systems. Overseas customers should contact their local distributor for a suitable alternative.

Supplied with the autodialer is the EL-018 adapter. The EL-018 serves three purposes:

• it controls the dialer
• it provides power for the dialer and for the system
• it can provide battery backup for much longer periods than the logger's internal backup

The dialer adapter is supplied in a grey plastic box with a clear lid. The box has a large hole each side for cables. There is space for a 1.2AH battery inside the box: this will provide backup for 12 to 24 hours, depending on the configuration. Alternatively the unit can be connected to a larger, 12V lead acid battery (for example a car battery) outside the box: this could provide backup for many days.

The Speech Dialer can give three messages for different types of problem:

• temperature out of range or sensor fail
• mains fail for more than five minutes
• network fail for more than five minutes