` SR535 Alarm Unit - Alpha Controls & Instrumentation Inc.

SR535 Alarm Unit

Alarm unit with Pt100 input and 4-20 mA output


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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

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)
Output 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
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
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