Coming SOON!!!!

Since the release of the original SEC Millenium 22 years ago, our engineers have designed and implemented enhanced optical absorption integrity, lower power consumption and developed software algorithms for our other infrared family of gas detectors and analyzers.  All of this knowledge, experience and features have been incorporated into the SEC Millenium Hawk.


SEC 3100 Logic Interface Module (LIM)

  • 3100 LIM gas detection equipment module
Click image to enlarge

The SEC 3100 LIM is used in conjunction with the SEC toxic and explosive gas detectors, SEC 3100 Universal Transmitter or SEC 3100 DIN Controller gas detection equipment.  A non-SEC device with normally open contacts is wired to the SEC 3100 LIM and becomes a part of the SEC hazardous gas detection system.  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.  The SEC 3100 LIM is factory programmed with the following customer supplied variables:

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

The SEC 3100 LIM visually displays the variables on the LCD the same as if the SEC 3100 had an SEC gas detector connected.  The SEC 3100 transmitter reports the foreign device 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 LIM 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


  • Interfaces non-SEC devices to a Modbus network
  • Accepts low and high alarm input contacts closure

 *Please select the quantity for each item you wish to order and click the 'Add To Cart' button below.

Operating Voltage:

  • 18-32 VDC

Temperature Rating:

  • -40° to + 70°C           

Device Variable Characters:

  • Device Name: 8
  • Range: 4
  • Unit of Measure: 4
  • Calibration Value: 4 (Standard ASCII Characters)

Operating Current (No Sensor):

  • 50mA @ 24VDC


  • 0-99% RH (non-condensing)

Output (digital):

  • SEC SSP (Smart Sensor Protocol)


  • Low Alarm
  • High Alarm

Applications where non-Sensor Electronics devices need included on the Modbus Network