The AimSafety PM400-IR is a rechargeable four-gas portable monitor that simultaneously detects carbon monoxide (CO), hydrogen sulfide (H2S), oxygen (O2) and combustible gas (LEL) using an infrared LEL sensor, with 60 days continuous runtime on a single charge.
Specifications on this page are taken from the PM400 Series Data Sheet (Macurco, 1/2026), PM400 Multi-Gas Personal Monitor User Manual Rev. 2.0 and the AimSafety line card.
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Warranty
Key Features
Technical Specifications
| Gases Detected | Carbon monoxide (CO), hydrogen sulfide (H2S), oxygen (O2), combustible gas (LEL) |
|---|---|
| CO Range / Resolution | 0 to 500 ppm / 1 ppm |
| H2S Range / Resolution | 0 to 100 ppm / 0.1 ppm |
| O2 Range / Resolution | 0 to 30 % Vol / 0.1 % Vol |
| LEL Range / Resolution | 0 to 100 % LEL / 1 % LEL |
| Sensor Type | LEL infrared; O2, CO and H2S electrochemical |
| Sensor Replaceability | The PM400 Series Data Sheet lists field-replaceable sensors. See the servicing note in the FAQ below before replacing a sensor or battery. |
| Sensing Method | Diffusion |
| Sensor Life | Infrared LEL sensor greater than 5 years; O2, CO and H2S greater than 2 years |
| CO Low / High / STEL / TWA | 35 / 100 / 200 / 35 ppm |
|---|---|
| H2S Low / High / STEL / TWA | 10 / 15 / 15 / 10 ppm |
| O2 Low / High | 19.5 / 23.5 % Vol |
| LEL Low / High | 10 / 20 % LEL |
| Calibration Gas Defaults | CO 100 ppm, H2S 25 ppm, O2 18 % Vol, LEL 50 % LEL |
| Alarm Indication | Audible 90 dB at 4 in. (10 cm), vibration, flashing red LEDs, LCD alarm icon and backlight |
| Set Points | User selectable via PM Link and PC software or bump test / calibration station |
| Battery | Rechargeable 3.7 V lithium-ion |
|---|---|
| Runtime | 60 days continuous |
| Data Logging | Two months continuous at 1-minute intervals, 24 hours a day, 7 days a week |
| Event Logging | 30 events, 30 calibrations, 30 bump tests |
| Dimensions | 4.48 in. (L) x 2.39 in. (W) x 1.6 in. (H) with clip (11.37 x 6 x 4 cm) |
|---|---|
| Weight | 8.0 oz. (227 g) with battery and clip |
| Housing Material | Polycarbonate and rubber |
| Color | Orange |
| Mounting | Clip |
| Display | Backlit digital LCD, real-time gas concentrations, battery status, alarm notifications |
| Operating Temperature | -4 to 122 °F (-20 to 50 °C) |
| Operating Humidity | 10 to 95 % RH, non-condensing |
| Ingress Rating | IP67, dust tight and water resistant |
| North America | UL and 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 |
| EMC | Electromagnetic Compatibility Directive 2014/30/EU |
| Quality System | Manufacturer certified compliant with ISO 9001:2000 provisions |
| Country of Origin | South Korea |
| ECCN | EAR99 |
Documentation
Related Products
Frequently Asked Questions
Which gases does the AimSafety PM400-IR detect?
It simultaneously detects four gases: carbon monoxide (CO) from 0 to 500 ppm, hydrogen sulfide (H2S) from 0 to 100 ppm, oxygen (O2) from 0 to 30 % by volume, and combustible gas (LEL) from 0 to 100 % LEL.
What is the difference between the PM400-IR and the PM400-P?
Both monitors detect the same four gases. The PM400-IR uses an infrared LEL sensor, which is immune to poisoning, works in inert low-oxygen atmospheres, carries a sensor life greater than 5 years and runs 60 days per charge. The PM400-P uses a catalytic bead (pellistor) LEL sensor with a sensor life greater than 2 years and 24 hours of runtime per charge.
How long does the PM400-IR run on a single charge?
60 days continuous on a single charge of its rechargeable 3.7 V lithium-ion battery.
Is the PM400-IR approved for hazardous locations?
Yes. It is UL and CSA approved for Class I, Division 1, Groups A, B, C and D, T4, and for Class I, Zone 0, AEx ia IIC T4 Ga. It also carries IECEx Ex ia IIC T4 Ga.
Can the PM400-IR sensors and battery be replaced?
Macurco documentation is not consistent on servicing the PM400. The PM400 Series Data Sheet lists field-replaceable sensors and AimSafety catalogues replacement sensors and battery packs by part number, but the PM400 Multi-Gas Personal Monitor User Manual Rev. 2.0 states that the battery and sensor should not be replaced because the PM400 is designed to be disposable, and that changing them may impair intrinsic safety and void the warranty. The PM400 Quick Start Guide states that charging or replacing the battery should be done in a safe area and that using components not authorised by the manufacturer will void the warranty. The manual's maintenance section adds that the unit should not be disassembled, repaired or modified, that only replacement parts from the supplier should be used, and that substituting components may impair intrinsic safety. Confirm the intended service path with Macurco before replacing a sensor or battery on a monitor already in service. The infrared LEL sensor is catalogued as 70-2900-0540-4, the combined CO / H2S sensor as 70-2900-0540-1 and the battery pack as 70-2900-0532-2.
How is the PM400-IR bump tested and calibrated?
The PM400-STN bump test and calibration station tests, configures and updates firmware on up to four PM400 monitors at a time without a computer. The PM Link PC interface performs zero and span calibration, configuration and log retrieval from a Windows PC.
What is the warranty on the AimSafety PM400-IR?
Two year limited warranty, provided the monitor is maintained and used in accordance with AimSafety instructions and recommendations.
- Product Type:
- Portable Gas Monitor
- Gas Detected:
- Carbon Monoxide (CO)
- Gas Detected:
- Hydrogen Sulfide (H2S)
- Gas Detected:
- Oxygen (O2)
- Gas Detected:
- Combustible (LEL)
- Number of Gases:
- 4
- LEL Sensor Type:
- Infrared
- Ingress Rating:
- IP67
- Hazardous Location:
- Class I Div 1
- Power Source:
- Rechargeable Li-ion
- Runtime:
- 60 Days
