SEC 3100 LIM (Logic Input Module) from SEC


A non-SEC device with normally open contacts is wired to the SEC 3100 LIM (Logic Input Module) from Sensor Electronics. The SEC 3100 LIM receives a Low and High contact closure from the device, converts the input signal into a digital signal compatible with the SEC 3100 transmitter. It is factory programmed with the following customer variables:

  • Device Name
  • Range
  • Unit of Measure
  • Calibration Value

The SEC 3100 visually displays the variables on the LCD the same as if the SEC 3100 had an SEC gas detector connected. The 3100 transmitter reports the foreign status bidirectional to the SEC 3500 HMI Operator Interface via the MODBUS RS485 communication network. The SEC 3100 LIM can be installed in the SEC 3100 explosion proof transmitter housing using a taller window dome.

The SEC 3100 accepts one device input for Low Alarm and High Alarm. Examples of switch contact devices that can be used with the SEC 3100 LIM are:

  • Open Path Gas Detectors
  • Fire detectors
  • Temperature Switch
  • Pressure Switch
  • Air Flow Switch


Operating Voltage 18-32 VDC
Operating Current (No Sensor) 50 mA @ 24 VDC
Output (Digital) SEC SSP, smart sensor protocol
Temperature Range -40° to +70°C
Humidity 0-99% rH
Input Low alarm, high alarm
Device Variable Characters Device Name: 8
Range: 4
Unit of Measure: 4
Calibration Value: 4

Ordering Information

For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email


SEC3100 Literature

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