YES Plus LGA 15-Channel IAQ Monitor

For monitoring: Ammonia, Arsine, Carbon dioxide, Carbon monoxide, Chlorine, Chlorine dioxide, Ethylene, Ethylene oxide, Fluorine , Formaldehyde, Hydrogen, Hydrogen chloride, Hydrogen cyanide, Hydrogen fluoride, Hydrogen sulphide, Methane, Nitric oxide, Nitrogen dioxide, Oxygen, Ozone, Phosphine, Silane, Sulphur dioxide, TVOCs

Simultaneously measures and records up to 15 sensors including temperature and RH in on easy to carry instrument


  • Residential Buildings
  • Commercial Buildings
  • Hospitals
  • Laboratories
  • Schools
  • Airports
  • Research Facilities
  • and many more...

Key Features

  • 15 sensor capacity
  • More than 30 plug & play sensors available to choose from, including electrochemical, catalytic, infrared & PID
  • Extensive, easy to use menu system
  • Rugged ABS enclosure with swivel handle that acts as stand support
  • Internal sample pump with inline filter
  • Large, backlit, multi-line, LCD display
  • Data logging to SD memory card
  • Menu control positive sampling
  • Data logging software for collecting, analyzing and graphing data


YES Plus LGA is a multi-gas air quality monitoring and information recording instrument that simultaneously measures and records up to fifteen sensors. With more than 30 different plug and play sensors to select from, users can accurately monitor more within a single, easy to carry instrument.

The fifteen channel sensor capacity includes RH and temperature, allowing the YES Plus LGA to handle up to 12 additional plug & play sensors consisting of a maximum of eight electrochemical toxic gas or oxygen sensors, four high current draw sensors such as an infrared, PID or catalytic, and a remote YESDUST particulate sensor. The large, backlit, multi-line scrolling LCD display indicates the sensor types installed and measured values for each gas, battery status and more. The system utilizes a long life rechargeable NiMH battery pack providing more than 24-hours of run time, depending on sensor array installed. The user can also set one alarm level for each gas to activate the internal audible alarm. The system is housed in a rugged ABS enclosure with swivel handle to act as a stand support or for carrying the instrument.

An air sample from the target environment is delivered to the sensors through “active sampling” by the internal sample draw pump. More than a million data points can be logged and stored on a built-in SD flash card for convenience.

The optional YES Logger package consists of a 2 GB SD flash card, USB cable, YES Viewer software, and SD flash card reader. The SD flash card reader stores the data and can be transferred. Alternatively, data could be downloaded through the instrument using a standard USB connection. The YES Viewer PC software will allow users to analyze and graph data.

Target Gas
Gas Sensors
Ammonia (NH3), Arsine (AsH3), Carbon dioxide (CO2), Carbon monoxide (CO), 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), Methane (CH4), Nitric oxide (NO), Nitrogen dioxide (NO2), Oxygen (O2), Ozone (O3), Phosphine (PH3), Silane (SiH4), Sulphur dioxide (SO2), TVOCs
Rugged ABS (UL94-HB rated) with multi-position, adjustable aluminum carrying handle/stand
1.7 kg / 3.6 lbs
254 x 89 x 178 mm / 10.0 x 3.5 x 7.0 inches
Case (included)
Hard plastic storage/carrying case with foam lining
User Interface
Back-lit, multi-line LCD alphanumeric display
4 tactile push buttons for user access
Automated through keypad
Audible Alarm
Internal alarm rated 80 dB @ 4 ft / 1.2 m, one setpoint adjustment, audible can be switched off through menu
Data Logging
Sampling Mode
Internal sample pump automatically draws in sample of target environment
> 1 million data points data logging to SD flash card (optional)
12 bit, multi-channel, user configurable with 2GB SD memory card slot
Optional: YES Logger package with 2GB SD memory card, card reader, USB cable and YES Viewer
Miniature USB port for changing settings and configuring logging functions Auxiliary port for using external sensor (ie. YES DUST)
Rechargable 3.6 V NiMH battery pack with plug-in battery charger 100 - 240 V, 50-60 Hz
Continuous operation with plug-in wall adapter 6VDC, Class-III, 2 A DC max
Optional: Alkaline AA batteries x 3
Operating Temperature
5°C to 50°C (41°F to 122°F)
Storage Temperature
-20°C to 60°C (-4°F to 140°F)
Relative Humidity
0 - 99% RH non-condensing
Conforms to
RoHS compliant circuit boards
UL94 flammability rating
Product Codes
Internal temperature & RH sensors, LCD display, internal sample draw pump, inline filter, calibration fitting, rechargeable nickel hydride battery pack & wall adapter, capacity for up to 12 gas sensors, plus an RH and a Temperature sensor. Comes in a plastic storage/carrying case with foam lining.
Sensor Options
Infrared carbon dioxide (CO2) smart sensor (0 - 5,000 ppm range) 
Infrared carbon dioxide (CO2) smart sensor (0 - 10,000 ppm range) 
Infrared carbon dioxide (CO2) smart sensor (0 - 20% volume range) 
Infrared carbon dioxide (CO2) smart sensor (0 - 5% volume range) 
Infrared carbon dioxide (CO2) smart sensor (0 - 100% volume range) 
Infrared methane (CH4) smart sensor (0 - 5% volume range) 
Electrochemical carbon monoxide (CO) smart sensor (0 - 50 ppm range) 
Electrochemical carbon monoxide (CO) smart sensor (0 - 50 ppm range), H2 compensated to 900 ppm for use in H2 background 
Electrochemical nitrogen dioxide (NO2) smart sensor (0 - 5 ppm range) 
Electrochemical nitric oxide (NO) smart sensor (0 - 100 ppm range) 
Electrochemical ethylene (C2H4) smart sensor (0 - 200 ppm range) 
Electrochemical ethylene oxide (C2H4O) smart sensor (0 - 20 ppm range) 
Electrochemical oxygen (O2) smart sensor (0 - 25% volume range) 
Electrochemical ozone (O3) smart sensor (0 - 1 ppm range). Only available with YESAIR-D. 
Electrochemical ammonia (NH3) smart sensor (0 - 50 ppm range) 
Electrochemical chlorine (Cl2) smart sensor (0 - 5 ppm range). Only available with YESAIR-D. 
Electrochemical chlorine dioxide (ClO2) smart sensor (0 - 1 ppm range) 
Electrochemical hydrogen (H2) smart sensor (0 - 1,000 ppm range) 
Electrochemical hydrogen sulphide (H2S) smart sensor (0 - 50 ppm range) 
Electrochemical hydrogen chloride (HCl) smart sensor (0 - 30 ppm range). Only available with YESAIR-D. 
Electrochemical hydrogen cyanide (HCN) smart sensor (0 - 100 ppm range) 
Electrochemical hydrogen fluoride (HF) smart sensor (0 - 10 ppm range). Only available with YESAIR-D. 
Electrochemical sulphur dioxide (SO2) smart sensor (0 - 20 ppm range) 
Electrochemical formaldehyde (CH2O) smart sensor (0 - 5 ppm range) 
Electrochemical arsine (AsH3) smart sensor (0 - 2 ppm range) 
Electrochemical fluorine (F2) smart sensor (0 - 2 ppm range). Only available with YESAIR-D. 
Electrochemical phosphine (PH3) smart sensor (0 - 1 ppm range) 
Electrochemical silane (SiH4) smart sensor (0 - 50 ppm range) 
Catalytic combustible gas smart sensor (0 - 100% LEL range), pls specify - hydrogen (H2), methane (CH4) or propane (C3H8)
PID TVOCs smart sensor (0 - 300 ppm range) 
PID TVOCs smart sensor (0 - 30 ppm range) 
Remote Sensor
Particulate sensor (1 - 10 micro meters range), plugs into YES Plus LGA

Options, Accessories and More...