Alarms; Remote Alarm Contacts - Thermo Scientific 263C-AEV-TS User Manual

This fridge-freezer has been designed to provide both an audible and visual alarm should any
of the following situations occur:
• Door is left open for a set period
• Internal air temperature goes outside the set parameters, either too high or too low
• Internal 'load' temperature goes outside the set parameters, either too high or too low
Should one of these alarms occur this can be muted by pressing
The 'load' temperature is a simulated temperature which is intended to provide an indication of
the temperature of the fridge-freezer's contents (e.g. a 5ml sample). The temperature of a
fridge-freezer's contents will change more slowly (up or down) than the air temperature within
that fridge-freezer should there be a fault or the door is left open.
All ES series laboratory fridge-freezers include remote alarm contacts and these terminal
contacts enable the user to connect to a remote control station; these contacts can be found on
the rear of the cabinet. WARNING: These contacts must only be accessed by a competent
electrician.
In order to use these contacts the following must be carried out:
1. The fridge-freezer MUST be disconnected from the power supply before removing the
terminal cover.
2. Unscrew the cover (figure 1) on the right hand side of the rear of the cabinet to expose
the connectors (figure 2).
3. Use the right hand outer positions that correspond to the left hand cable positions for
your connections using 0.75mm cable stripped to 0.6mm.
4. Depress the larger slot above the cable entrance on the right hand side with a small
electrical screwdriver. This allows the cable to be inserted into the slot directly below.
In the event of a door open alarm, high or low temperature alarm or power failure a remote
relay will switch within the controller to make an electrical circuit.
Please note that the contacts supplied are voltage free. A voltage of between 12V DC and
230V AC can be connected at the contacts. The maximum load must not exceed 2A. The
minimum power rating is 500mA / 12V AC.
In a normal condition (i.e. no alarm) the relay OPENS the contact for the remote alarm facility.
In an alarm condition the relay CLOSES the contact for the remote alarm facility.
Warning Alarms

Remote alarm contacts

Figure 1
on the controller.
Figure 2
10