LPT-A Analog Transmitter

LPT-A Analog 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, Refrigerants
Single channel, analog gas detector with many gas sensor choices


Parking Facilities, Vehicle Repair Shops, Arenas and Pools, Refrigeration Rooms, Chiller Rooms, Battery Charging Rooms, Hotels, Airports 
and many more...

Key Features

  • Single channel, with internal or remote sensor options
  • Linear 4 - 20 mA analog or 0 - 10 volt output signal
  • LCD display
  • One 2A SPDT dry contact relay
  • Internal audible alarm
  • 3-wire VDC or 4-wire VAC power
  • 24 volt DC or AC power (nominal)
  • Unobtrusive calibration and menu navigation using a magnetic wand
  • Optional heater for cold environment applications
  • Standard water / dust tight, corrosion resistant enclosure (drip proof)
  • IP54 rated with optional splash guard installed

The LPT-A is a full featured, single sensor, analog transmitter available with a wide range of sensors and sensor 
types including electrochemical toxic, solid state refrigerants and catalytic combustibles. Operating as an analog
transmitter or a stand-alone fixed system, the LPT-A offers 3-wire VDC or 4-wire VAC power, jumper selectable
4 - 20 mA or 0 - 10 VDC analog output, one dry contact relay, thermal resetting fuses, temperature compensation,
back lit LCD display and audible alarm, all in a RoHS compliant package.
It comes standard with a water / dust tight, corrosion resistant ABS /polycarbonate enclosure with a hinged, secured 
door. With the optional splash guard installed, the enclosure is IP54 rated and ideal for use in water spray or wash
down applications.
Automated calibration and other maintenance procedures are simple and easily performed in the field. For parking 
garage applications, our proprietary Calibration Extending Firmware (CEF) takes into account the aging of the sensor
so that less frequent calibrations are required. For use in non-hazardous, non-explosion rated commercial and light
industrial 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

Solid State Sensors (internal)				R22, R134A, R402A, R404A, R407C, R410A, R422D, R438A, R438A, 
R507A, R514A Refrigerants, TVOCs

Catalytic Sensors (internal or remote)			Hydrogen (H2), Methane (CH4), Propane (C3H8)

PID Sensors (remote)				        TVOCs

Infrared Sensors (remote)				        Propane (C3H8)


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

Weight						     363 g / 0.8 lbs

Size						          127 x 127 x 53 mm / 5.0 x 5.0 x 2.1 inches

User Interface

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


Output Linear 4 - 20 mA analog
Maximum 216 Ω load (wiring plus termination resistor) @ 12 VDC
Maximum 316 Ω load (wiring plus termination resistor) @ 12 VAC
Voltage 0 - 10 volt
Minimum 1k ohm load

Relay						          1 SPDT dry contact, rated 30 Volts, 2 Amps max

Audible Alarm					     Standard internal buzzer


Power Requirement
3-wire mode: 16-30 VDC, 3 W, Class 2
4-wire mode: 12-27 VAC, 50-60 Hz, 3 VA, Class 2

Current Draw					     125 mA @ 24VDC (max)

Wiring						     VDC (or ground referenced AC): 3-conductor 18 AWG stranded, shielded 
VAC: 4-conductor 18 AWG stranded, shielded

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-M1983 (R2009), 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
interference received, including interference that may cause
undesired operation.
RoHS compliant circuit boards

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