This intelligent sensor/switch with an extralargedisplay is specifically designed to switcha valve and to establish a monitoring system oran ON/OFF control loop.Compact and wall versions are available. Thewall-mounted version must be inserted into a holder previously mounted on a wall, and itmust be associated with a remote temperature sensor. The switching points can be programmed with the 3 key pads or optionally, with input 4 - 20 mA, from an external PLC over a 4 - 20 mA loop. As an option, the process value can additionally be transmitted to the PLC (4 - 20 mA). The connection of the 8400 to the process in

the piping is made using standard fittings.

Electrical data

Power supply 12-30 V DC , filtered and regulated

Outputs

Compact version

Transistor (programmable)

Relay (programmable)

Process value (option)

Wall-mounted version

NPN and PNP, open collector, 5 up to 30 V DC,

700 mA max., protected against short circuits

3A/250 V AC or 3A/30 V DC

3A/48 V AC or 3A/30 V DC1)

4-20 mA, galvanic insulation

Loop resistance: 1000 Ù at 30 V DC,

800 Ù at 24 V DC, 500 Ù at 18 V DC

NPN and PNP, 700 mA, 30 VDC max.

Input external setpoint

Compact version 4-20 mA, galvanic insulation, max. input impedance: 250 Ù

Current consumption

Compact version

Wall-mounted version

Max. 80 mA (no load)

Max. 50 mA (no load)

Response time (10...90%) 7 s (for one step increment from 0 up to 100°C (32 to 212°F))

Reversed polarity of DC Protected

Environment

Ambient temperature -20 up to 60°C (4 to 140°F)

Relative humidity ≤ 80%, without condensation