DatasheetSR335 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
| 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 |