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LPT Low Power Transmitter

Key Features

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2-wire loop, 3-wire VDC or 4-wire VAC power
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Linear 4 - 20 mA output signal
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Standard water / dust tight enclosure (drip proof)
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Single sensor: carbon monoxide (CO) or nitrogen dioxide (NO2)
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RoHS compliant circuit boards
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Easy maintenance
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Economical
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Includes sensor CEF (calibration extending firmware)
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Auto resetting fuse
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Automated calibration procedure

Description
Specifications
Technical Library
Product Codes
Accessories

LPT is an economical, single sensor, “Low Power Transmitter”. Sensors available include carbon monoxide (CO) and nitrogen dioxide (NO₂) which are ideal for vehicle exhaust type applications such as parkades.

LPT transmitter features a two-wire loop, three-wire VDC or four-wire VAC power; making installation a cinch. LPT transmitter also features a 4 - 20 mA linear output signal, automatic thermal resetting fuse, RoHS compliant circuit boards, temperature compensation, and visual LED indication for power and fault conditions and is all enclosed in a standard water / dust tight (drip proof) ABS / polycarbonate enclosure that is equivalent to IP62 (NEMA 12) rating. For splash or hosedown applications, add splash guard.

Includes new sensor CEF (Calibration Extending Firmware) that takes into account the aging of the sensors so that less frequent calibrations are acceptable in non-critical applications.

Automated calibration and other maintenance procedures are simple and easily performed in the field.

APPLICATIONS

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Parking Garages
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Repair Shops
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Ice Cleaning Machine Rooms
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Manufacturing Plants
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Maintenance Facilities

Gas Types

Carbon Monoxide (CO)	TCO
Nitrogen Dioxide (NO2)	END

Sensors

Carbon Monoxide (CO) Sensor
Type:	Electrochemical
Range:	0 - 200 ppm
Response Time (T₉₀):	< 150 seconds
Operating Temperature:	-10°C to 60°C (14°F to 140°F)
Operating Humidity:	5 - 95% RH non-condensing
Operating Pressure:	N/A
Repeatability:	< 2% of signal
Maximum Zero Shift:	N/A
Clean Air Output Drift:	< 10 ppm equivalent per year
Expected Life Span:	6 - 7 years in air (under normal conditions)
Calibration:	Every 6 months or once a year (depending on application)
Cross Sensitivity:	H₂S @ 20 ppm = < 0.1 ppm NO₂ @ 10 ppm = < 0.1 ppm Cl₂ @ 10 ppm = < 0.1 ppm NO @ 50 ppm = < 5 ppm SO₂ @ 20 ppm = < 0.1 ppm H₂ @ 20°C (68°F) @ 400 ppm = < 60 ppm C₂H₄ @ 400 ppm = < 25 ppm NH₃ @ 20 ppm = < 0.01 ppm

Nitrogen Dioxide (NO₂) Sensor
Type:	Electrochemical
Range:	0 - 10 ppm
Response Time (T₉₀):	< 30 seconds
Operating Temperature:	-20°C to 50°C (-4°F to 122°F)
Operating Humidity:	15 - 90% RH non-condensing
Operating Pressure:	Atmospheric ± 10%
Repeatability:	< 2% of signal
Maximum Zero Shift:	± 0.2 ppm equivalent
Clean Air Output Drift:	< 2% signal loss / month
Expected Life Span:	2 - 3 years in air (under normal conditions)
Calibration:	Every 6 months or once a year (depending on application)
Cross Sensitivity:	H₂S @ 20 ppm = < -40 ppm Cl₂ @ 10 ppm = 100 ppm NO @ 50 ppm = < 0.5 ppm SO₂ @ 20 ppm = < -2.5 ppm CO @ 400 ppm = < 0.1 ppm H₂ @ 400 ppm = < 0.1 ppm C₂H₄ @ 50 ppm = < 0.1 ppm NH₃ @ 20 ppm = < 0.1 ppm CO₂ @ 5% volume = < 0.1 ppm

Mechanical

LPT Standard Economical Transmitter
Enclosure:	ABS / Polycarbonate
Weight:	400 g (14 oz)
Size:	5.0” x 4.0” x 1.9” (127 mm x 102 mm x 48 mm)

Electrical

Power Requirement:	2-wire mode: 16 - 30 VDC 3-wire mode: 16 - 30 VDC 4-wire mode: 12 - 30 VAC or 16 - 30 VDC
Current Draw:	Maximum 25 mA
Outputs:	Linear 4 - 20 mA Maximum 216 Ω load (wiring plus termination resistor) at 16 VDC Maximum 316 Ω load (wiring plus termination resistor) at 12 VAC
Wiring:	VDC two or three conductor shielded 18 awg stranded VAC four conductor shielded 18 awg stranded
Fuse:	Automatic resetting thermal
Indicator:	Solid Green: Power ON Flashing Green (50% duty cycle): Warm up Flashing Green (short OFF, long ON): Fault mode LED OFF: No Power or 4-20 mA “Open Loop” (unit won’t operate)

Input / Output

User Interface

Environmental

Operating Temperature:	-20°C to 40°C (-4°F to 104°F)
Humidity:	15 - 90% RH non-condensing

Note: Measurements above are sensor dependent.

Certifications

CE	Pending
C-Tick	Pending

Drawings

LPT Drawing

Small Metal Protective Guards Drawing Small Metal Protective Guard Drawing

Product Specifications

LPT Carbon Monoxide (CO) Product Specifications

LPT Nitrogen Dioxide (NO₂) Product Specifications

Engineering Specification Samples

DataSheets

LPT Datasheet

Operation Manual

LPT Operation Manual

Application Brochure

Miscellaneous Files

LPT Tri-Fold Brochure

Product Codes

LPT series, analog transmitter w/ electrochemical carbon monoxide (CO) sensor (0 - 200 ppm range), LED indicator, 4 - 20 mA output, two-wire / three-wire / four-wire VAC power, sensor calibration extending firmware (CEF), water / dust tight enclosure	LPT-TCO
LPT series, analog transmitter w/ electrochemical nitrogen dioxide (NO2) sensor (0 - 10 ppm range), LED indicator, 4 - 20 mA output, two-wire / three-wire / four-wire VAC power, sensor calibration extending firmware (CEF), water / dust tight enclosure	LPT-END

Watertight Option

Splash guard

Metal Protective Guard

» 16 gauge, clear anodized metal protective guard
» Larger size for controllers & self-contained systems
» Smaller size for analog & digital transmitters

Calibration Kit

» Full selection of calibration gases from stock
» All required calibration accessories for field and shop calibration
» Full service and calibration shop for fixed gas detection instruments