G7x/G7 Bridge Overview

G7x/G7 Bridge

G7x is a wireless personal safety and lone worker monitoring device that connects workers to real monitoring personnel using 3G cellular and the Iridium satellite networks. Connectivity is complemented by two-way text messaging, providing critical insights on G7x’s brilliant LCD screen in the event of an emergency. Devices automatically watch over workers and call for help, even when the employee can’t. G7x provides situational awareness enabling teams to respond with all the information necessary for optimized rescues in hazardous environments. Should G7x experience a fall, no-motion, gas exposure or a missed check-in, assisted-GPS capability guides responders directly to the effected worker’s location. All safety incidents are communicated to Blackline’s live monitoring teams who can mobilize responders to an employee’s exact location or trigger scalable evacuations in real-time when required.

G7x leverages G7 Bridge portable satellite and 3G base station, which switches seamlessly to satellite connectivity should cellular become unavailable. G7x communicates with G7 Bridge via an industrial-quality 900 MHz radio link from up to 2 km away. G7 Bridge communicates with the Blackline Safety Network and monitoring teams using 3G or satellite connections.

If you are using G7x for gas detection, you can review your device’s bump test and calibration certificates here.


How long will my battery last?

G7x has a battery life of 20 hours continuous operation at 20°C (68°F). G7 Bridge has a battery life of 44 hours at 20°C (68°F), 50 hours at -20°C (-4°F) and 14 hours at -40°C (40°F).

Where can I mount G7 Bridge?

In order for G7 Bridge to function properly it must have a clear view of the sky. Therefore, G7 Bridge can be mounted on vehicle dashes, roof racks, toolboxes, and ATV’s, or anywhere that bridge will have a clear view of the sky.

G7x is taking abnormally long to connect to G7 Bridge, what could be the issue?

Ensure that G7 Bridge is turned on, has a solid SureSafe light and is within range of G7x (2km maximum). If you are the fifth device connecting to G7 Bridge, connect time could be noticeably longer than previous devices. If trying to connect six or more devices to G7 Bridge, be aware that G7 Bridge only has the capability to host five connected devices at a time.

How do I connect G7x to G7 Bridge?

Turn on G7 Bridge and wait for a solid SureSafe light. Turn on G7x you wish to connect to G7 Bridge. The device is connected when the SureSafe light is solid green.

G7 Bridge's connectivity is spotty, what could be the issue?

Ensure that G7 Bridge has a clear view of the sky. G7 Bridge is not designed to be used indoors, car parks, or underground.

Is G7x compatible with Loner Bridge?

G7x is only compatible with G7 Bridge.

How many G7x can I pair with G7 Bridge?

A maximum of five devices can be paired to G7 Bridge at one time.

G7x's green light is flashing, what should I do?

Ensure that G7 Bridge has a clear view of the sky and that G7x is within range of bridge.

I keep getting missed check-ins when I turn off my G7x, what should I do?

When logging off, ensure that all connected devices are shut down before you turn off G7 Bridge. If G7 Bridge is turned off before connected devices, it will result in a red alert for missed check-in.

What is the range for G7 Bridge?

G7 Bridge has a range of 2km – this range can be reduced by obstructions like foliage, mountains and buildings.

Will G7 Bridge work with other safety monitoring devices?

G7 Bridge is only compatible with G7x and Loner 900 devices.

In which countries is G7x/G7 Bridge supported?

G7x/G7 Bridge are only supported in North America, Australia and New Zealand.

Does G7x have latching alarms?

Blackline provides a more advanced method of latching than traditional gas detectors. The device itself does not “latch” – it shows the current status of the gas reading so that the user has the best and most accurate information available to them.

However, high gas alerts are latched in our portal. These alerts are persistent even when the gas clears. Monitoring personnel will follow the company’s custom protocol before resolving the alert.

If I have a G7 with a single gas Oxygen (O2) cartridge, can I bump and calibrate with my breath?

Yes. The G7 supports bumping and calibrating with your breath. Here’s an explanation of how it works:

During and instrument calibration, the output of each gas sensor must be measured at two points. Those two points are called zero point and span point. Zero point represents the output of the sensor in the absence of gas and span point represents the output of the sensor at a higher, known concentration of gas.

The ambient environment does not contain the target gas for most gas sensors so ambient air can used to measure the zero point during calibration. Then a known concentration of the target gas is applied to the sensor to measure the span point. After these two points have been measured and confirmed to be within the acceptable limits, the calibration can be applied to the instrument.

Oxygen sensors are an exception to what is described above. The ambient air contains 20.9% of the target gas, oxygen, so it cannot be used to measure the zero point . For oxygen sensors the zero point is assumed to be when the sensor has zero output. Ambient air is used to measure the span point at 20.9%. Using those two points the calibration is calculated but it is not immediately applied to the instrument. The sensor has not yet been tested to ensure that it responds when the concentration of oxygen changes. To confirm the operation of the sensor a gas that has a concentration of lower than 19.5% must be applied. If the sensor responds appropriately to the drop in oxygen then the previously calculated calibration is applied to the instrument.

Bottled calibration gas for oxygen sensors will typically contain 18% oxygen. This gas is used during the calibration process to test the that the oxygen sensor responds appropriately but is not actually used in the determination of a zero or span point. Because exhaled breath only contains about 15% oxygen, an oxygen calibration can be completed by breathing on the sensor.

How do I bump and calibrate a chlorine gas sensor?

Chlorine is unique in that it is a sticky gas — it adheres to surfaces it has contact with, causing it to release slower than other gases. When bump testing or calibrating chlorine keep the following tips in mind:

  1. Use our stainless steel 1.0L fixed flow regulator (ACC-REG-1L) instead of our regular 0.5L regulator. ONLY use the 1.0L regulator with chlorine gas.
  2. Use teflon-lined tubing. Our chlorine sensors are shipped with special tubing (Versilon SE200).

G7 dock does NOT support chlorine gas. DO NOT use dock to bump test or calibrate chlorine sensors.

Support Materials


G7 the Future of Connected Safety and Gas Detection

How to bump test G7 using a balloon adapter

Resource Library

G7x Datasheet