Product type: Pt 100/Pt 1000/PTC temperature relay with network and bus interfaces
Model / Part number: TR660IP, T224371 (RS485 Modbus RTU variant)
Sensor inputs: 6 × Pt 100, Pt 1000 or PTC thermistor (mixed sensors possible, 2‑wire or 3‑wire)
Number of alarm limits: Up to 7 alarm setpoints / output relays
Sensor monitoring features:
“2 of x” alarm evaluation (alarm triggers only when 2 sensors exceed limit)
Monitoring of temperature differences between sensors
Monitoring of rate of temperature change (ROCOT)
Logging of temperatures and history
Display: Color LCD for measured values, alarm states and navigation; joystick control on device
Outputs:
7 × relay outputs with change‑over contacts (K1…K7)
RS485 interface with Modbus RTU protocol (read/logging)
Ethernet TCP/IP interface with web server and Modbus TCP (network access)
Universal power supply: AC/DC 24…270 V (50/60 Hz)
Monitoring range: −199.9 °C to +800 °C
Switching delay (configurable): 00:00…59:59 (mm:ss)
Protection class: Housing IP30 / Terminals IP20
Operating ambient temperature: –20 °C … +65 °C
Dimensions: approx. 140 × 90 × 58 mm (width × height × depth), mounting height ~55 mm
Mounting: Snap mount on 35 mm DIN rail or M4 screws
Compliance / Standards: EN 61010, EN 61326, CE/UKCA, UL (typical)
Weight: approx. ~400 g
