SR535 (Discontinued)

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
Category: .

Technical Specification

InputPt100 (acc. to IEC 60751) 3-wire connection
Range0-100, 0-150, 0-200, 0-300, 0-500 °C
Sensor current3 mA
Output Relay 1Temperature monitoring 1-pole switch over contact
Selectable High or Low alarmJumpers on PCB (standard: High)
Adjustable alarm set-pointFront 15-turn potentiometer / test connector
Selectable alarm delay0.4 s (standard) or 2 s, changeable on PCB
Selectable hysteresis0.5 % (standard) or 5 %, changeable on PCB
Selectable normally active or passive functionJumpers on PCB (standard: normally active)
Output Relay 2Error monitoring, 1-pole opening contact
Fixed, normally active and opening contactAlarm at power failure, sensor break or high input (125 %)
Output Current4-20 mA linear to selected temperature range
Operation temperature-20 to +60 °C / -4 to +140 °F
Galvanic isolation
Input to relay outputs3 700 VAC, 1 min
Input to AC power supply3 700 VAC, 1 min
Input to DC power supply1 500 VAC, 1 min
Relay outputs to power supply3 700 VAC, 1 min
Input to mA outputNot isolated
Power supply
AC versions230 VAC, -15..+10 %, 45..75 Hz
115 VAC, -15..+10 %, 45..75 Hz
DC version19 to 60 VDC
Typical accuracyTrip point, mA output, ± 0.1 % of span
ConnectionsPlug-in terminals Stranded, ≤ 2.5 mm2, AWG 14
MountingRail acc. to DIN EN 50022, 35 mm


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