Digital devices
5
5.1 Applications
Digital devices are used for monitoring of set temperature limits, for example, and output of
alarm messages.
In addition to temperature monitoring, digital devices also oer an eective option for two-step
and three-step control. Two-step control allows the devices to be used as heating thermostats,
for example. As three-step controllers, the devices switch over automatically, for example,
between heating and air-conditioning, depending on the temperature.
Digital devices with up to three resistance temperature sensors are designed specically to
monitor motor windings and motor bearings, but can also be used in all applications requiring
up to three sensors.
The devices are used in the following applications and more:
• Protection of plants and the environment
• Exhaust temperature monitoring
• Temperature monitoring in control cabinets
• Frost monitoring
• Temperature limits for process variables
• Control of plants and machinery
• Motor monitoring
• Bearing monitoring
• Gear oil monitoring
• Monitoring of coolants
• Packaging industry
• Electroplating
• Air-conditioning systems
• Ventilation systems
• Solar collectors
• Heat pumps
• Hot water supply
• Panel building
• Rail
• Shipbuilding
3RS2 temperature monitoring relay
Equipment Manual, 02/2022, A5E42462552002A/RS-AB/002 25
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