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SR535 alarm unit - Inor

SR535 alarm unit - Inor

Alarm Unit with Pt100 Input and 4-20 mA Output

SR535 is designed for monitoring Pt100 signals in the process industry.
The unit gives alarm functions for either increasing or decreasing temperatures and for certain error states.

SR535 provides a temperature linear output signal, 4-20 mA, corresponding to the measurement range.

  • Direct Pt100 input
  • 4-20 mA output
  • One temperature monitoring relay
  • One error monitoring relay
  • Reliable and interference free safety alarm without false alarms
  • High configuration flexibility with solder jumpers
  • Adjustable time delay, hysteresis and relay functions
  • Available for AC or DC power supply
  • DIN-rail mounting
  • Plug-in screw terminals

Main features

Input

  • Input: Pt100 (acc. to IEC 60751) 3-wire connection
  • Range: 0-100, 0-150, 0-200, 0-300, 0-500 °C
  • Sensor current: 3 mA

Output

  • Relay 1: Temperature monitoring, 1-pole switch over contact
  • Selectable High or Low alarm: Jumpers on PCB (standard: High)
  • Adjustable alarm set-point: Front 15-turn potentiometer / test connector
  • Selectable alarm delay: 0.4 s (standard) or 2 s, changeable on PCB
  • Selectable hysteresis: 0.5 % (standard) or 5 %, changeable on PCB
  • Selectable normally active or passive function: Jumpers on PCB (standard: normally active)
     
  • Relay 2: Error monitoring, 1-pole opening contact
  • Fixed, normally active and opening contact: Alarm at power failure, sensor break or high input (125 %)
  • Output Current: 4-20 mA linear to selected temperature range
  • Operation temperature: -20 to +60 °C / -4 to +140 °F

Galvanic isolation

  • Input to relay outputs: 3 700 VAC, 1 min
  • Input to AC power supply: 3 700 VAC, 1 min
  • Input to DC power supply: 1 500 VAC, 1 min
  • Relay outputs to power supply: 3 700 VAC, 1 min
  • Input to mA output: Not isolated

Power supply

  • AC versions:
    230 VAC, -15..+10 %, 45..75 Hz
    115 VAC, -15..+10 %, 45..75 Hz
  • DC version: 19 to 60 VDC
     
  • Typical accuracy: Trip point, mA output, ± 0.1 % of span
  • Connections: Plug-in terminals Stranded, ≤ 2.5 mm2, AWG 14
  • Mounting: Rail acc. to DIN EN 50022, 35 mm
  • Inor Process AB

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