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For monitoring: Ammonia, Carbon monoxide, Chlorine dioxide, Chlorine, Ethylene, Ethylene oxide, Fluorine, Formaldehyde, Hydrogen, Hydrogen sulphide, Hydrogen chloride, Hydrogen cyanide, Hydrogen fluoride, Nitric oxide, Nitrogen dioxide, Oxygen, Ozone, Phosphine, Silane, Sulfur dioxide, Methane, Propane, Hydrogen, TVOCs


Key Features

  • 1, 2 or 3 channel operation with internal and/or remote sensor configurations
  • Modbus® RS-485 RTU communication
  • LCD display
  • One 2A SPDT dry contact relay
  • Internal audible alarm
  • 24 VAC/VDC power
  • 4-conductor daisy chain network wiring
  • Unobtrusive calibration and menu navigation using a magnetic wand
  • Optional display heater for cold environment applications
  • Standard water / dust tight, corrosion resistant enclosure (drip proof)
  • IP54 rated with optional splash guard installed.



The LPT-M is a full featured, three channel, digital transmitter for use in non-hazardous, non-explosion rated, commercial and light industrial applications. It is available with a wide range of internal and/or remote sensors and sensor types including electrochemical, catalytic and PID TVOCs.

The LPT-M may be configured to operate as a standalone fixed system or be part of a digital network. It offers a Modbus® RS-485 RTU output signal for communicating with a Controller and/or a Building Automation System, an audible internal alarm, one SPDT dry contact relay, LCD display with user selectable functions, temperature compensation and thermal resetting fuses all in a RoHS compliant package.

The LPT-M comes in a standard water / dust tight, corrosion resistant ABS / polycarbonate enclosure with a hinged, secured door. With the optional, factory installed splash guard the enclosure is IP54 rated and provides protection in water spray or wash down applications. An optional heater is available for continued operation in cold environment applications.

LPT-M Modbus® Transmitter

  • Target Gas


    Electrochemical Sensors (internal)

    Ammonia (NH3), Carbon monoxide, Chlorine (Cl2), Chlorine dioxide (ClO2), Ethylene (C2H4), Ethylene oxide (C2H4O), Fluorine (F2), Formaldehyde (CH2O), Hydrogen (H2), Hydrogen chloride (HCl), Hydrogen cyanide (HCN), Hydrogen fluoride (HF), Hydrogen sulphide (H2S), Nitric oxide (NO), Nitrogen dioxide (NO2), Oxygen (O2), Ozone (O3), Phosphine (PH3), Silane (SiH4), Sulphur dioxide (SO2), TVOCs (Isobutylene)

    Catalytic Sensors (remote)

    Hydrogen (H2), Methane (CH4), Propane (C3H8)

    PID Sensors (remote)


    Infrared Sensors (remote)

    Propane (C3H8), Carbon dioxide (CO2)




    ABS / Polycarbonate


    Copper coated interior to reduce RF interference


    IP54 rated with optional splash guard installed


    363 g / 0.8 lbs


    127 x 127 x 71 mm / 5.0 x 5.0 x 2.8 inches

    User Interface



    Graphic LCD, green border


    Magnetic switches to initiate calibration without opening the enclosure




    Modbus® RS-485 RTU


    One SPDT dry contact, rated 30 Volts, 2 Amps max

    Audible Alarm

    Standard internal buzzer



    Power Requirement

    16-30 VDC, 3 W, Class 2


    12-27 VAC, 50-60 Hz, 3 VA, Class 2

    Current Draw

    30 mA (buzzer & relay energized, 2 sensors)


    LAN Modbus® RTU (version 1.1b3) RS-485, 16 gauge, 4-conductor shielded network wiring (daisy-chain)


    Thermal, resetting

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