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 Part Numbers 
Product Codes
LPT-A-NH3 Electrochemical ammonia (NH3) sensor (0 - 500 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-COA Electrochemical carbon monoxide (CO) sensor (0 - 200 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, sensor CEF, water / dust tight enclosure 
LPT-A-COB Electrochemical carbon monoxide (CO) sensor (0 - 200 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, sensor CEF, water / dust tight enclosure 
LPT-A-CL2 Electrochemical chlorine (Cl2) sensor (0 - 5 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure with PTFE membrane sensor element protection 
LPT-A-CL2-10 Electrochemical chlorine (Cl2) sensor (0 - 10 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure with PTFE membrane sensor element protection 
LPT-A-CLO2 Electrochemical chlorine dioxide (ClO2) sensor (0 - 1.0 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure
LPT-A-C2H4
 Electrochemical ethylene (C2H4) sensor (0 - 200 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-EETO Electrochemical ethylene oxide (C2H4O) sensor (0 - 20 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-F2 Electrochemical fluorine (F2) sensor (0 - 1 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-CH2O Electrochemical formaldehyde (HCHO / CH2O) sensor (0 - 5 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-EH2 Electrochemical hydrogen (H2) sensor (0 - 2,000 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-HCL Electrochemical hydrogen chloride (HCl) sensor (0 - 20 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-HCN
 Electrochemical hydrogen cyanide (HCN) sensor (0 - 100 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-HF Electrochemical hydrogen fluoride (HF) sensor (0 – 10.0 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-H2S Electrochemical hydrogen sulphide (H2S) sensor (0 - 50 ppm range) 3 yr life span, LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-H2SB Electrochemical hydrogen sulphide (H2S) sensor (0 - 50 ppm range) 5+ yr life span, LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-NO Electrochemical nitric oxide (NO) sensor (0 - 100 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-NO2A Electrochemical nitrogen dioxide (NO2) sensor (0 - 10 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, sensor CEF, water / dust tight enclosure 
LPT-A-NO2B Electrochemical nitrogen dioxide (NO2) sensor (0 - 10 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, sensor CEF, water / dust tight enclosure
LPT-A-O2 Electrochemical oxygen (O2) sensor (0 - 25% volume range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-O3 Electrochemical ozone (O3) sensor (0 - 1 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure with PTFE membrane sensor element protection 
LPT-A-PH3 Electrochemical phosphine (PH3) sensor (0 - 5 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure
LPT-A-SIH4 Electrochemical silane (SiH4) sensor (0 - 20 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure
LPT-A-SO2 Electrochemical sulphur dioxide (SO2) sensor (0 - 20 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-SR134A Solid state refrigerant (R134A) sensor (0 - 2,000 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-SR22
 Solid state refrigerant (R22) sensor (0 - 2,000 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure
LPT-A-SR402A Solid state refrigerant (R402A) sensor (0 - 2,000 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-SR404A Solid state refrigerant (R404A) sensor (0 - 2,000 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-SR407C Solid state refrigerant (R407C) sensor (0 - 2,000 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-SR410A Solid state refrigerant (R410A) sensor (0 - 2,000 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-SR422D Solid state refrigerant (R422D) sensor (0 - 2,000 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-SR438A Solid state refrigerant (R438A) sensor (0 - 2,000 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-SR507A Solid state refrigerant (R507A) sensor (0 - 2,000 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-SR513A Solid state refrigerant (R513A) sensor (0 - 2,000 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure
LPT-A-SR514A Solid state refrigerant (R514A) sensor (0 - 2,000 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-STVOC Solid state TVOC sensor (0 - 500 ppm range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-CH2-100 Catalytic hydrogen (H2) sensor (0 - 100% LEL range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-CCH4-100 Catalytic methane (CH4) sensor (0 - 100% LEL range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-CC3H8-100 Catalytic propane (C3H8) sensor (0 - 100% LEL range), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure 
LPT-A-R Single channel, no internal sensor (set up to accept an ESH-A remote sensor), LCD display, 4 - 20 mA or 0 - 10 VDC output, three-wire VDC or four-wire VAC power, 2 A @ 30 VAC / VDC SPDT relay, audible alarm, water / dust tight enclosure  
NOTE: other gases may be available upon request

Factory Options
-H Internal heater for cold environment applications down to -40°C / 40°F
-S Splash Guard for non sticky gas sensors, factory installed, IP54 rating
-SN Splash Guard for sticky gas sensors (Cl2, ClO2, HCl, HCN, O3, PH3), factory installed 
Remote Sensors
ESH-A-CH2-100 Catalytic Hydrogen (H2) ESH-A Remote Sensor (0 - 100% LEL), water / dust tight enclosure
ESH-A-CCH4-100
 Catalytic Methane (CH4) ESH-A Remote Sensor (0 - 100% LEL), water / dust tight enclosure 
ESH-A-CC3H8-100 Catalytic Propane (C3H8) ESH-A Remote Sensor (0 - 100% LEL), water / dust tight enclosure
ESH-A-SPL PID TVOC ESH-A Remote Sensor (0 - 30 ppm range), water / dust tight enclosure 
ESH-A-SPH PID TVOC ESH-A Remote Sensor (0 - 300 ppm range), water / dust tight enclosure 
ESH-A-JET Infrared Propane (C3H8) ESH-A Remote Sensor (0 - 100% LEL) range), water / dust tight enclosure 
ESH-SR410A-Z Dongle style remote ESH refrigerant (R410A) sensor (0 - 2000 ppm) for hotel applications
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