Bender 107TL47

The ISOMETERs® of the 107TL47 series monitor the insulation resistance of single and

three-phase AC IT systems in medical locations. In addition, the IT system transformer is

monitored for overload and overtemperature. In combination with the alarm indicator

and test combination MK2430 they particularly comply with the requirements of DIN VDE

0100-710 (VDE 0100 Teil 710) and IEC 60364-7-710.

• Monitoring device for medical IT systems

AC, 3(N)AC

• Adjustable response value 50…500 kΩ

• Load and temperature monitoring

• Alarm LED

• Monitoring of the connection to the system,

earth, measuring current transformer,

temperature sensors

• Test button

• External test button can be connected

• BMS-bus interface

• Common alarm relay with one potentialfree changeover contact

• Backlit LC display 

If one of the measured values exceeds the limiting value (insulation resistance, load current,

temperature), an alarm is initiated. The alarm relay switches, the ALARM LED lights up and a

message appears on the LC display. This alarm message is transferred to remote MK2430

alarm indicator and test combinations installed in the medical location via two-wire interface

so that the technical or medical staff is informed immediately.

The measuring leads to the system and PE, to the current transformer and to the temperature

sensor are monitored continuously. If one of these measuring leads is interrupted or shortcircuited, a message will appear. The function of the device can be checked by pressing

the Test button.

The insulation resistance of operating theatre lamps often is monitored by another insulation

monitoring device that activates a relay contact in case of alarm (voltage-free NO contact).

The alarm message of this contact is recorded by the 107TL47 and transferred via the

BMS (Bender Measuring Device Interface) bus to other Bender devices such as a remote

alarm indicator and test combination.

In order to detect the load current in three-phase systems, an CMS460-D4-2 load current

monitor is required which in combination with the STW2 current transformers measures

the current of the phase conductors. The highest value of the load current is evaluated by the

electronics and is made available at the input k/l of the 107TL47.

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