100 Series
Analog Input Signal ``Smart Relay`` Threshold Alarm with Local LED Indication
RoHS 2 Compiant


Series 100
Analog Input Signal ``Smart Relay`` Threshold Alarm with Local LED Indication

The ALRT-100 accepts a binary analog output signal for applications requiring local or remote visual or contact closure alarming. The device provides a visual LED indication as well as a contact closure relay capable of passing up to 3 amps at 30VDC or 24 VAC.

  • Comparison Threshold Alarm
  • LED Alarm Indication
  • Dry Contact N.O. Relay
  • Trigger with an Analog DC Signal
  • Input Range 0-10 VDC or 4-20 mA
  • Activation Trigger > 3 VDC or 6 mA
  • Ideal for Advantage IV Products
  • Convert AO Alarm to LED/Relay Alarm
  • Simple Terminal Block Connections
  • 1-year Warranty

Typical Applications

  • Convert Analog Signal Alarms to Visual or Contact Closure Alarms
  • Gold & Hybrid Transmitter Enhanced Alarming


  • Ideal for LEED Compliance when no B.A.S. is Provided
  • Satisfy Fault Detection Requirements of Codes and Standards
  • Detect HVAC System Failure

Product Highlights

  • Fixed Threshold
  • No Setup or Configuration Required
  • Accepts VDC or mA DC Analog Signals
  • Easy to Install
  • Low Cost



Type: Analog input (AI1)
Voltage: 0-10 VDC
Current: 4-20 mA (from 4 wire source, no excitation voltage)


Type: Dry contact w/onboard jumper to drive a remote LED (R1=Alarm)
Status: N.O.
Rating: 30 VDC or 24 VAC @ 3 amp. Max.

Analog Input (AI1) Threshold Alarm

Type: Threshold alarm on AI1 > comparison threshold
Comparison Threshold:
Voltage: Fixed at 3 VDC
Current: Fixed at 6 mA
Delay: None
Reset Method: Automatic
Visual Indication: Yes, red LED
Contact Closure Relay Assignment: Yes, R1

Listings and Compliance

FCC: -This device complies with Part 15 of the FCC rules
RoHS: This device is RoHS2 compliant

Environmental Limits

Temperature: -20 to 120 ⁰F [-28.9 to 48.9 ⁰C]
Humidity: 5 to 95%
Power Requirement: 24 VAC (22.8 to 26.4 under load) @1.5V-A
Dimensions: 3.36H x 4.25W x 1.36D in. [85.2×108.0 x 34.5 mm]

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