Alarm Unit SR335

At a glance:

• SR335 is designed for industrial temperature monitoring with Pt100 sensors in 2- or 3-wire connection.
• Two output relays with individually adjustable trip functions are available.
• LED’s in the front indicate alarm state and correct power supply.
• Input from Pt100 sensors in 2- or 3-wire connection
• Selectable, pre-calibrated temperature ranges
• Two relay outputs with independent switch functions
• Monostable relays for safe tripping at power failure
• SPDT relays with 6 A switch capacity
• High configuration flexibility with DIP switches
• Trip levels and hysteresis adjustable from the front
• Three front LED’s for trip indication and power supply monitoring
• 4 kV isolation between input, output and power supply
• Protective Separation acc. to EN 50178
• Universal 24 V AC and DC power supply
• DIN-rail mounting

Technical data:

• Input

Sensor: Pt100, Pt200, Pt500 and Pt1000 (switch selectable)

Measuring range: Zero: -100 / -50 / 0 / +50 °C (switch selectable)/ Span: 100 / 200 / 300 / 400°C (switch selectable)

Sensor connection: 2-wire and 3-wire (switch selectable)

• Output, Relay 1 & 2

Relay contacts: 1-pole switch over contact (SPDT)

Contact rating: 250 VAC/DC, 6 A, 1 500 VA

Relay function: Monostable, Normally active or passive (switch selectable)

Alarm functions, relay 1: High/Low alarm (switch selectable)

Alarm functions, relay 2: High/Low alarm or Power failure alarm (switch selectable)

Alarm indication: Alarm state indicated by yellow LED

Response time: Ca. 20 ms (fixed)

Operation temperature: -20 to +60 °C / -4 to +140 °F

• Galvanic isolation

Input / power supply / relay outputs: 4 kVAC, 1 min

Relay 1 / Relay 2: 2,5 kVAC, 1 min

• Power supply

Voltage: 24 VAC/DC ±15 %, 48 to 62 Hz (AC supply)

Power consumption: AC: ca. 2 VA/ DC: ca. 1 W

Typical accuracy: Trip point ±0.2 % of span

Mounting: Rail acc. to DIN EN 50022, 35 mm

Dimensions:

Connection diagram: