LPT-M Modbus Transmitter

LPT-M Modbus® Transmitter
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
A full featured, 3 channel, digital (Modbus®) gas detector with many gas sensor choices
Parking Facilities, Arenas and Pools, Chiller Rooms, Manufacturing Plants, Maintenance Facilities, Food Processing
Plants and many more...
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.
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)				        TVOCs

Infrared Sensors (remote)				        Propane (C3H8)

ABS / Polycarbonate, corrosion resistant Copper coated interior to reduce RF interference IP54 rated with optional splash guard installed

Weight						        363 g / 0.8 lbs

Size						                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

Modbus® RS-485 RTU

Relay						                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)

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

Fuses						                Thermal, resetting

Operating Temperature
-20°C to 40°C (-4°F to 104°F)

Operating Humidity					15 - 90% RH non-condensing

Conforms to
CSA-C22.2 No. 205-12 / UL508 (Edition 17):2007 EMC Directive 2004/108/EC, EN 50270:2006, Type 1, EN61010 FCC. This device complies with part 15 of the FCC Rules. Operation
is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause
undesired operation. RoHS compliant circuit boards

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