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

Applications
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)

Mechanical

Enclosure						        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

Display						        Graphic LCD, green border 		
						                Magnetic switches to initiate calibration without opening the 
                                                                enclosure

Input/Output

Output						        Modbus® RS-485 RTU

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

Audible Alarm					        Standard internal buzzer

Electrical

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

Environmental

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

Operating Humidity					15 - 90% RH non-condensing

Certifications

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