31
31
SR335
SPECIALISTS IN INDUSTRIAL TEMPERATURE MEASUREMENT
RTD
RTD
Alarm Unit
with Pt100 Input
and Double Relay Outputs
SR335
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 conguration exibility 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 connections
Pt sensor
2-wire connection
Pt sensor
3-wire connection
Output connections
Relay 1
Relay 2
Power supply
Specications:
Input
Sensor Pt100, Pt200, Pt500 and Pt1000 (switch selectable)
Standard IEC 60751, =0.00385
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)
Sensor wire resistance ≤10 Ω per wire
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
Adjustable alarm set-point 0 to 100 % of input range (12-turn potentiometers in front)
Adjustable hysteresis 0 to 60 % of span (12-turn potentiometers in front)
Response time Ca. 20 ms (xed)
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
Polarity independent
Dimensions
Ordering information
SR335, 24 VAC/DC 70SR335001
Conguration 70CAL00001
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