Operating G7 in cold weather

The following article outlines the impact cold weather can have on G7's sensors and battery life.

Like most portable gas detectors on the market, G7 has a lower temperature specification of -20°C. G7 will function in temperatures colder than this for short periods of time, but Blackline does not recommend letting the device's internal temperature drop below -20°C. In -40°C weather, this typically means not working for periods longer than 30 minutes at a time before warming up.

 

IMPACT OF EXTREME COLD ON ELECTROCHEMICAL SENSORS

Blackline offers several electrochemical sensors including*:

  • Ammonia (NH3)
  • High range ammonia (NH3)
  • Carbon monoxide (CO)
  • High-range carbon monoxide (CO)
  • Hydrogen resistant carbon monoxide (CO-H)
  • Chlorine (Cl2)
  • Chlorine dioxide (ClO2)
  • COSH
  • Hydrogen (H2)
  • Hydrogen cyanide (HCN)
  • Hydrogen sulphide (H2S)
  • High range hydrogen sulphide (H2S)
  • Oxygen (O2)
  • Sulphur dioxide (SO2)

At temperatures below -20°C, the sensor electrolyte inside CO, H2S and other electrochemical sensors can freeze overtime, reducing the ability of the sensor to give a meaningful output. Storing G7 in a warm and humid (60% relative humidity) environment when not in use will help keep electrochemical sensors running longer.

Shocking an electrochemical sensor from room temperature to extreme cold and vice versa can also cause temporary drifts in sensor readings. These readings typically resolve in less than a minute.

 

IMPACT OF EXTREME COLD ON INFRARED SENSORS

Blackline offers several infrared sensors including*:

  • Carbon dioxide (CO2)
  • LEL-infrared (LEL-IR)

Blackline also offers a PID sensor. While PID isn't an infrared sensor, the cold weather has similar effects on PID as it would on infrared sensors.

Unlike electrochemical sensors, there is no liquid electrolyte inside an infrared sensor. However, there are optics within the sensor that can be affected by condensation. This condensation has the potential to cause a temporary reduction in readings or produce temporary readings on the LEL-IR sensor.

Shocking the IR sensor from a room temperature to an extremely cold environment can cause the sensor to drift slightly for a short period of time. On an LEL-IR sensor, the reading should typically be < 10% LEL. If this drift persists you can manually zero the sensor in the cold environment.

Shocking the IR sensor from an extremely cold environment to room temperature can cause a high reading — sometimes even reaching over-limit — on the LEL channel. Typically, this effect lasts less than 60 seconds, after which point the readings will recover and G7 will function as normal.

 

*Sensors offered by Blackline are subject to change. For the most up-to-date sensor list, please contact our Customer Care team.

BATTERY RUN TIME

All G7 devices include GPS and Cellular or 900MHz radios, which can impact battery runtime depending on the conditions the device working in. In typical cellular and GPS coverage in a room temperature environment, G7 gets 18-20+ hours of battery. In areas without GPS (indoors or underground) the GPS radio will run at higher power in order to acquire a location, which may reduce the runtime by up to 4 hours. When working in temperature below -20°C, G7's battery runtime will drop significantly.