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 3500 HMI Operator Interface

  • Hazardous gas detection HMI Operator Interface accessory
Click image to enlarge

Container Ship

The SEC 3500 HMI is an operator interface dedicated to communicating to the SEC 3100 gas detectors, SEC 4855 Relay Controllers, SEC DAIM units.  The SEC 3500 has output capabilities to the plant control system.  There are 16 programmable relays in the SEC 3500.  Each 3500 comes with a standard powerful 32 bit processor.  Also included is a compact flash socket to increase memory. The SEC 3500 uses an industry standard RS485 communication protocol to interrogate up to 254 Network Devices.  Standard display screens are set up for intuitive interaction for the operator and network devices.  The primary screens are Main Zone Summary, Alarm Summary, Bus Summary.  Individual device screens can be viewed and programmed from the SEC 3500 HMI.  Password protected security ensures only authorized access to critical screens.  Please contact us if you are interested in adding an alarm to this product.  Using the internet, individuals can have remote web access and can control SEC hazardous gas detection products offsite.


  • Intuitive Graphical Interface
  • RS 485 Modbus RTU Communication to SEC 3100
  • Remote Web Access And Control Facility
  • Powerful 32 bit Processor
  • 16 Programmable Relays
  • Compact Flash socket to increase memory

Emergency 3500 Restore Kit, for SEC 3500 HMI Panels showing a black screen

with the white text "INVALID DATABASE" and unresponsive to reset or power-

cycling. Click the link below to download the latest kit zip file:

Latest Emergency 3500 restore Kit Zip File

Operating Voltage:

  • 19-29 VDC

Power Consumption:

  • 40 Watt Max (Not including relay)
  • Contact current or 24 VDC supplied to external relays

Temperature Rating:

  • Operating 0 to +50C
  • Storage:  -25 to + 60C

Operation and Storage Humidity:

  • 0-80% maximum RH (Non-condensing)
  • From 0 to + 50C


  • Up to 2000 meters


  • RS485 Port: Interactive “Modbus” (expandable to two)
  • RS232 Port:  “Statcast” System parameter broadcast
  • Ethernet Port:  Remote Screen Access
    • 10 BASE-T/ 100 BASE TX
  • RJ45 jack wired as a NIC (Network Interface Card)
  • 16 Programmable Relays (expandable to 40)

Relay Contacts:

  • 1 NO, 1 NC per Relay
  • Contact Rating: 8A @ 30 VDC, 8A @ 250VAC

Audible Alarm:

  • 1 – Alarm and Fault


  • Type: DSTN
  • Colors: 256 VGA
  • Pixels: 640 x 480
  • Brightness: 120cd/m2
  • Backlight: 40,000 hours typical


  • 35 lbs (16.1 Kg)


  • Lithium Coin Cell


  • 8 Mbyte non-volatile flash

Memory Card:

  • CompactFlash Type II slot for Type I and Type II CompactFlash cards

Housing Construction:

  • Powder Coated Steel

Housing Dimensions:

  • 15 (W) x 15 (L) x 11 (D) inches
  • 381 (W) x 381 (L) x 279.4 (D) mm

System Components:

  • SEC3500 Operator Interface (Master)
  • SEC 3100 Gas Transmitter
  • Remote Relay Module
  • AIM Interface Module
  • Repeater


  • CSA Approval
  • UL2017 Compliant

Installation Category:

  • Cat. 1, Pollution Degree 2
  • Refineries
  • Drilling/Production Platforms
  • Fuel Loading Facilities
  • Oil Well Logging
  • LNG/LPG Processing and Storage Facility
  • Gas Turbines
  • Chemical Plants
  • Compressor Stations
  • Waste Water Treatment Facilities
  • Transportation Facilities

Please Enter Your Zip Code or Sign In to View Shipping Information

Zip Code