AimSafety PM400 Series

Advanced, easy-to-use, 4-gas monitor for worker protection in hazardous environments

The innovative new AimSafety PM400 4-gas portable monitor brings enhanced convenience and flexibility to gas detection in hazardous environments. The ergonomic PM400 diffusion gas monitor simultaneously detects up to four gases, including hydrogen sulfide (H2S), carbon monoxide (CO), oxygen (O2) and combustibles (LEL). AimSafety’s PM400 is easy to use and delivers continuous visibility of gas concentrations for faster, more informed decisions that help protect workers and operational assets which can increase revenue and productivity.

The PM400 LCD display provides real-time gas concentrations and allows plant managers or workers to set high and low alarm set-points for each sensor, and STEL, and TWA alarm set-points for toxic gases. The PM400’s audible, visual and vibrating alarms alert the user of unsafe gas concentrations.

The PM400 IR will operate continuously for up to 60 days on a single battery charge. Standard sensors include: Carbon Monoxide, Hydrogen Sulfide, Oxygen, and either Catalytic Bead or Infrared for combustible gases (LEL).


• Easy-to-read LCD display
• Single button operation
• Rugged, high visual housing
• IP67 dust tight & water resistant
• 60-day continuous runtime (IR version)
• IR sensor is immune to poisoning
• IR sensor use in inert (low O2) environments


• Confined space entry
• Oil & gas
• Heavy metal & steel
• Chemical plants
• Pulp & paper
• Municipalities
• Food & beverage
• Contractor / construction
• First responder



General Specifications

Size4.48”(L) x 2.39”(W) x 1.6”(H) *with clip 11.37 cm x 6 cm x 4 cm
Weight8.0 oz. (227 g.) PM400-IR 8.3 oz. (235 g.) PM400-P
Sensor TypeField-replaceable sensors: LEL – Catalytic Bead (Pellistor) LEL – Infrared O2, CO, H2S – Electrochemical
BatteryRechargeable Li-ion
Run Time60 days continuous, IR (LEL) version 24 hours continuous, P (LEL) version
Event Logging30 Events, 30 Calibrations, 30 bump tests
Data LoggingTwo months - Continuous at 1 - minute intervals, 24 hours a day, 7 - days a week
IP RatingIP67 dust tight and water resistant
DisplayBacklit digital LCD display Real-time readings of gas concentrations Battery status Alarm notifications
AlarmsLCD Alarm Icon display, LCD Backlight Indicator LED Audible: 90 dB at 4 in. (10 cm)
Temperature-4°F to 122°F (-20°C to 50°C)
Humidity10% to 95% RH (Non-Condensing)
CertificationsUL & CSA Class I, Division 1, Groups A, B, C, D, T4 Class I, Zone 0, AEx ia IIC T4 Ga IECEx Ex ia IIC T4 Ga (PM400-IR) Ex da ia IIC T4 Ga (PM400-P) UL Listed CSA Listed
Gas Options
CO0 - 500 ppm1 ppm
H2S0 - 100 ppm0.1 ppm
O20 - 30% Vol0.1% Vol
Combustible (IR & P)0 - 100 %LEL1% LEL
Alarm Levels/ Calibration Gas Defaults
CO3510020035100 ppm
Name Model Number
P LinkPM-Link

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